Rexnord Thomas XTSR52 Instruction Manual

Thomas®XTSR52 Installation and Maintenance
(Page 1 of 13) Sizes 494-5258
CP3-002
September 2017
Supersedes 09-2016
Rexnord
5555 S. Moorland Rd., New Berlin, WI 53151-7953
Phone: [phone] Fax: [phone] www.rexnord.com
1. General Information
1.1 Rexnord Thomas Couplings are designed to provide a mechanical connection between the rotating shafts of mechanical equipment, using flexible
discs to accommodate inherent misalignment while transmitting the power and torque between the connected shafts.
1.2 These instructions are intended to help you to install and maintain your Rexnord Thomas coupling. Please read these instructions prior to
installing the coupling, and prior to maintenance of the coupling and connected equipment. Keep these instructions near the coupling installation
and available for review by maintenance personnel. For special engineered couplings, Rexnord may provide an engineering drawing containing
installation instructions that take precedence over this document.
1.3 Rexnord owns the copyright of this material. These Installation and Maintenance instructions may not be reproduced in whole or in part for
competitive purposes.
1.4 Symbol descriptions:
Danger of injury to persons.
Damages on the machine possible.
Pointing to important items.
Hints concerning explosion protection.
Type XTSR52
Sizes 494-5258
Figure 1 – Thomas XTSR52 Coupling without Adapter and with Adapter and Large Hub

Thomas®XTSR52 Installation and Maintenance
(Page 2 of 13) Sizes 494-5258
CP3-002
September 2017
Supersedes 09-2016
Rexnord
5555 S. Moorland Rd., New Berlin, WI 53151-7953
Phone: [phone] Fax: [phone] www.rexnord.com
2. Safety and Advice Hints
DANGER!
2.1 Safety should be a primary concern in all aspects of coupling installation, operation, and maintenance.
2.2 Do not make contact with the coupling when it is rotating and/or in operation.
2.3 Because of the possible danger to person(s) or property from accidents which may result from improper use or installation of these products, it is
extremely important to follow the proper selection, installation, maintenance and operational procedures.
2.4 Installation should be carried out by skilled personnel only. All personnel involved in the installation, service, operation, maintenance, and repair of
this coupling and the connected equipment must read, understand, and comply with these Installation and Maintenance instructions. The Installa-
tion and Maintenance instructions and assembly drawing, if provided, must be at hand at the installation site.
PRECAUTION
For this coupling to meet the ATEX requirements, you must precisely follow these installation and maintenance instructions, and the supplement form
0005-08-49-01. This supplement outlines the ATEX requirements. If the operator does not follow these instructions, the coupling will immediately be
considered non-conforming to ATEX.
2.5 All rotating power transmission products are potentially dangerous and can cause serious injury. They must be properly guarded in compliance with
OSHA, ANSI, ATEX, European machine safety standards and other local standards. It is the responsibility of the user to provide proper guarding.
2.6 The coupling should be stored in a dry corrosion protected environment, free from external loads (for example by stacking) to prevent damage
which may cause a hazard when the coupling is put into service.
2.7 For ATEX requirements the guard must have a minimum of 12.7 mm (1/2 in) radial clearance to the coupling outside diameter and allow for proper
ventilation.
2.8 All conductive parts of the equipment should be connected in such a way that hazardous electrical potential differences cannot occur. In case insu-
lated metal parts could be charged thus becoming a potential ignition source, earth connections must be provided.
2.9 Make sure to disengage the electrical power and any other sources of potential energy before you perform work on the coupling.
2.10 Packaging material can generate electrostatic charges. It may then become an explosive hazard. It must be removed from the coupling outside any
hazardous areas.
2.11 Proper lockout-tag out procedures must be followed to safeguard against unintentional starting of the equipment.
2.12 All work on the coupling must be performed when the coupling is at rest with no load.
2.13 Do not start or jog the motor, engine, or drive system without securing the coupling components. If the equipment is started with only a hub
attached, the hub must be properly mounted and ready for operation, with the key and set screw (if included) fastened. When the full coupling as-
sembly is started, all fasteners and hardware must be completely and properly secured. Do not run the coupling with loose fasteners.
2.14 Use explosive environment appropriate tools only, for more information see DIN EN 1127-1:2008:02, Annex A.
2.15 The coupling may only be used in accordance with the technical data provided in the Thomas disc coupling catalog. Customer modifications and
alterations to the coupling are not permissible.
2.16 All spare parts for service or replacement must originate from or be approved by Rexnord.

Thomas®XTSR52 Installation and Maintenance
(Page 3 of 13) Sizes 494-5258
CP3-002
September 2017
Supersedes 09-2016
Rexnord
5555 S. Moorland Rd., New Berlin, WI 53151-7953
Phone: [phone] Fax: [phone] www.rexnord.com
Figure 2 – Rexnord Thomas XTSR52 Coupling Components
Figure 3 – Disc Pack Hardware Kit
Consisting of , and above.
Note: Coupling component numbers above correspond to the component numbers in the column headers of Tables 1 and 2.
12
4
3
1
Cap Screws
6
2
5
9
87
1 3
4

Thomas®XTSR52 Installation and Maintenance
(Page 4 of 13) Sizes 494-5258
CP3-002
September 2017
Supersedes 09-2016
Rexnord
5555 S. Moorland Rd., New Berlin, WI 53151-7953
Phone: [phone] Fax: [phone] www.rexnord.com
**All hub part numbers are non bored.
Table 1 – Rexnord Thomas XTSR52 Coupling Component Part Numbers
Note: the circled numbers identified in the column headers below, correspond to the coupling component numbers in Figure 2.
XTSR52
Coupling
Size
Hubs** LH Hub + Cap
Screw Kit Center Member (1 per Coupling) Adapted Center Members
Standard
Part No.

Part No.

Part No.
(in)
"C"
Length
(in)
Part No.
(mm)
"C"
Length
(mm)
Part No.
(mm)
"C"
Length
(mm)
10003219 3.50 10003222 100 10003225 100
494 10003201 10611141 10003220 3.75 10003223 140 10003226 140
10003221 5.00 --- --- --- ---
10003227 3.50 10003230 100 10003233 100
644 10003202 10611142 10003228 3.75 10003231 140 10003234 140
10003229 5.00 --- --- --- ---
726 10001191 ---
10000921 3.50 10000831 100 10399144 100
10467168 3.75 10000910 140 10397159 120
10000922 5.00 --- --- --- ---
826 10001192 10001612
10000923 3.50 10000832 100 --- ---
10467167 3.75 10000911 140 10397201 120
10000924 5.00 --- --- 10397202 140
996 10001193 10001613
10000925 4.38 10000912 100 --- ---
10000926 5.00 10000833 140 10399148 140
--- --- 10000913 180 10397204 180
1088 10001194 10001614 10000927 4.38 10000834 140 10399150 140
10000928 5.00 10000914 180 10397205 180
1298 10001195 10001615 10000929 4.38 10000835 140 --- ---
10000930 5.00 10000915 180 10397206 180
1548 10001196 10001616
10000931 5.00 10000916 140 --- ---
10000932 7.50 10000836 180 1039155 180
10000933 8.00 10000917 250 --- ---
1698 10001197 10001617 10000934 7.50 10000837 180 --- ---
10000935 8.00 10000918 250 10397207 250
1928 10001198 10001618
10000936 7.50 10000838 180 --- ---
10000937 8.00 10000919 250 10397208 250
10000938 9.00 --- --- --- ---
2068 10001199 10001619
10000939 7.50 10000920 180 --- ---
10000940 8.00 10000839 250 10397211 250
10000941 9.00 --- --- --- ---
2278 10001200 10001620 10000942 8.00 10000840 250 --- ---
10000943 9.00 --- --- --- ---
2468 10001201 10001621 10000944 9.00 10000841 250 --- ---
2698 10001202 10001622 10000945 9.00 10000842 250 --- ---
2888 10001203 10001623 10000946 10.00 10000843 250 --- ---
3058 10001204 10001624 10000947 10.00 10000844 250 --- ---
3358 10001205 10001631 10000948 10.00 10000845 250 --- ---
3668 10001206 10001625 10000949 18.00 10000846 460 --- ---
3908 10001207 10001626 10000950 18.00 10000847 460 --- ---
4178 10001208 10001627 10000951 18.00 10000848 460 --- ---
4588 10001209 10001628 10000952 18.00 10000849 460 --- ---
4918 10001210 10001629 10000953 17.89 10000850 460 --- ---
5258 10001211 10001630 10000954 18 10000851 460 --- ---

Thomas®XTSR52 Installation and Maintenance
(Page 5 of 13) Sizes 494-5258
CP3-002
September 2017
Supersedes 09-2016
Rexnord
5555 S. Moorland Rd., New Berlin, WI 53151-7953
Phone: [phone] Fax: [phone] www.rexnord.com
Table 2 – Rexnord Thomas XTSR52 Coupling Component Part Numbers
Note: the circled numbers identified in the column headers below, correspond to the coupling component numbers in Figures 2 and 3.
XTSR52
Coupling
Size
Adapters Disc Pack
Part No.
(2 per
Coupling)

Hardware Kit Bolts, Locknuts, and Overload
Bushings for One Disc Pack 12
LH
Part No.
XL
Part No.
XXL
Part No.
Hardware
Kit *
Bolts
Quantity

Locknuts
Quantity

Bushings
Quantity

494 10003209 10003210 10003211 10003753 10611144 4 4 4
644 10003212 --- 10003214 10002803 10611145 4 4 4
726 --- 10001161 10002621 10000091 10001561 6 6 6
826 10000242 10001162 10002622 10000092 10001562 6 6 6
996 10000243 10001163 10002623 10000093 10001563 6 6 6
1088 10000244 10001164 10002624 10000094 10001564 8 8 8
1298 10000245 10001165 10002625 10000095 10001565 8 8 8
1548 10000246 10001166 10002626 10000096 10001566 8 8 8
1698 10000247 10001167 10002627 10000097 10001567 8 8 8
1928 10000248 10001168 10002628 10000098 10001568 8 8 8
2068 10000249 10001169 10002629 10000099 10001569 8 8 8
2278 10000250 10001170 10002630 10000100 10001570 8 8 8
2468 10000251 10001171 10002631 10000101 10001571 8 8 8
2698 10000252 10001172 10002632 10000102 10001572 8 8 8
2888 10000253 10001173 10002633 10000103 10001573 8 8 8
3058 10000254 10001174 10002634 10000104 10001574 8 8 8
3358 10000255 10001175 10002635 10000105 10001575 8 8 8
3668 10000256 10001176 10002636 10000106 10001576 8 8 8
3908 10000257 10001177 10002637 10000107 10001577 8 8 8
4178 10000258 10001178 10002638 10000108 10001578 8 8 8
4588 10000259 10001179 10002639 10000109 10001579 8 8 8
4918 10000260 10001180 --- 10000110 10001580 8 8 8
5258 10000261 --- --- 10000111 10001581 8 8 8
*Disc pack hardware sold as kits only.

Thomas®XTSR52 Installation and Maintenance
(Page 6 of 13) Sizes 494-5258
CP3-002
September 2017
Supersedes 09-2016
Rexnord
5555 S. Moorland Rd., New Berlin, WI 53151-7953
Phone: [phone] Fax: [phone] www.rexnord.com
3.1 Examine the coupling assembly to assure there is no visible damage.
3.2 Clean the hub bores and shafts using lint free cloth. Remove any nicks or burrs..
3.3 The key(s) should have a close side-to-side fit in the keyway in the hub and shaft, with a slight clearance over the top when assembled
Caution: When heating hubs is required, an oven is preferred and an open flame is not recommended. If flame heating is considered
mandatory, it is important to provide uniform heating to avoid distortion and excessive temperature. A thermal stick applied to the
hub surface will help determine the hub temperature.
DANGER!
Touching hot hubs causes burns. Wear safety gloves to avoid contact with hot surfaces.
4. Straight Bore with Clearance/Slip Fit
4.1 Install the key(s) in the shaft.
4.2 Check to be sure that the set screw(s) in the hub does not protrude into the keyway or the bore. Remove or back out the set screw to provide
clearance during assembly.
4.3 Slide the hub up the shaft to the desired axial position.
4.4 If used; assemble and tighten the set screw(s) using a calibrated torque wrench to the values shown in Table 3.
Figure 4 – Mounting Hubs on Shafts
3. Hub Mounting
DANGER!
Be sure to disengage the electrical power and any other sources of potential energy before you perform work on the hub and coupling assembly.

Thomas®XTSR52 Installation and Maintenance
(Page 7 of 13) Sizes 494-5258
CP3-002
September 2017
Supersedes 09-2016
Rexnord
5555 S. Moorland Rd., New Berlin, WI 53151-7953
Phone: [phone] Fax: [phone] www.rexnord.com
Table 3 – Set Screw Tightening Torque
5. Straight Bore with Interference Fit
5.1 Accurately measure the bore and shaft diameters to assure proper fit.
5.2 Install the key(s) in the shaft.
5.3 Heat the hub in an oven until the bore is sufficiently larger than the shaft.
5.4 275°F (135°C) is usually sufficient for carbon steel hubs. Do not exceed 400°F (205°C).
5.5 With the hub expanded, install it quickly on the shaft to the desired axial position. A pre-set axial stop device can be helpful.
6. Taper Bore
6.1 Check for acceptable contact pattern between the hub and the shaft.
6.2 Put the hub on the shaft, keeping the keyways (if existing) aligned.
6.3 Lightly tap the face of the hub with a soft mallet. The resultant position will provide a starting point for the hub axial draw up.
6.4 Use a depth micrometer to measure the distance from the shaft end to the hub face, as shown in Figure 5. Record the dimension.
6.5 Mount a dial indicator to read axial hub advancement, as shown in Figure 6. Alternatively, the indicator can be positioned to contact the end of the
hub. Set the indicator to “zero.”
6.6 Remove the hub and install the key(s) in the shaft.
6.7 Heat the hub in an oven until the bore is sufficiently larger than the shaft.
6.8 350°F (177°C) is usually sufficient for carbon steel hubs. Do not exceed 500°F (260°C).
6.9 Higher temperatures may be required for higher interference fit levels where alloy steel hubs may be encountered. A general rule to consider is that for
every 160°F increase in temperature, steel will expand 0.001 inch for every inch of shaft diameter (or 0.029 mm/100°C). When calculating tempera-
tures, also consider additional expansion to provide clearance and allow for a loss of heat and subsequent shrinkage during the handling process.
6.10 With the hub expanded, install it quickly on the shaft to the “zero” set point. Continue to advance the hub up the taper to the desired axial position,
as defined by Rexnord’s customer. Use the indicator as a guide only. A pre-set axial stop device can be helpful.
6.11 Inspect the assembly to verify that the hub is properly positioned. Consult Rexnord if necessary.
6.12 Install hub axial retention device (if any) in accordance with the equipment manufacturer’s specifications.
Set Screw Size 1/4-20 1/4-28 5/16-18 5/16-24 3/8-16 3/8-24 1/2-13 1/2-20
Hex Head Key Size 1/8 1/8 5/32 5/32 3/16 3/16 1/4 1/4
Tightening Torque (Nm) 7 9 15 16 27 31 68 75
(lb-in) 66 76 132 144 240 276 600 660
Set Screw Size M6 M8 M10 M12 M16 1/4 3/8
Hex Head Key Size 3 4 5 6 8 1/8 3/16
Tightening Torque (Nm) 6 12 25 50 100 8 25
(lb-in) 55 110 220 440 880 70 220
Figure 5 –
Shaft end to hub
face measurement
example.
Figure 6 –
Dial indicator
placement for axial
draw measurement
example.
CAUTION! Never use two set screws with one on top of the other in the same tapped hole.

Thomas®XTSR52 Installation and Maintenance
(Page 8 of 13) Sizes 494-5258
CP3-002
September 2017
Supersedes 09-2016
Rexnord
5555 S. Moorland Rd., New Berlin, WI 53151-7953
Phone: [phone] Fax: [phone] www.rexnord.com
7. Shaft Alignment
ATTENTION! Soft foot – the equipment must rest flat on its base. If one or more feet of the machine are shorter, longer, or angled in
some way to prevent uniform contact (a condition commonly known as “soft foot”) it must now be corrected.
ATTENTION! To improve the life of the coupling, the shafts must be aligned to minimize distortion of the flexing elements. Shaft
alignment is required in the axial, parallel, and angular directions, with each of these values not to exceed the recommended ratings
for the coupling and the alignment values shown in Table 4. Shaft alignment can be measured using various established methods,
including Laser Alignment, Reverse Dial Indicator, and Rim and Face.
7.1 Move the connected equipment to achieve acceptable alignment. When well aligned, the disc packs will be centered and approximately parallel to
their mating flange faces and the flexing elements will have little visible waviness when viewed from the side.
As a guide, the maximum and minimum values for dimension “N” shown in Figure 7 are given in Table 4. These dimensions are suggested for initial
installation. Additional capacity is available to compensate for thermal and structural equipment movement. Maximum axial capacity values for these
couplings are also given in Table 4.
Table 4 shows installation limits for Angular and Parallel Alignment. The Parallel Alignment value “P” is the offset between the centers of the hubs,
as shown in Figure 8. If parallel offset is measured by rotating the hubs with a dial indicator on the outside diameter, as shown in Figure 9 the total
indicated reading should be divided by (2) to calculate “P”. The Angular Alignment Total Indicator Reading value is the maximum difference between
the measurements (X-Y) taken at opposite ends of the hub flange, and spacer flange as shown in Figure 10.
Figure 7 – Disc Gap
Figure 8 Figure 10Figure 9

Thomas®XTSR52 Installation and Maintenance
(Page 9 of 13) Sizes 494-5258
CP3-002
September 2017
Supersedes 09-2016
Rexnord
5555 S. Moorland Rd., New Berlin, WI 53151-7953
Phone: [phone] Fax: [phone] www.rexnord.com
XTSR52
Coupling
Size
“A”
Dimension
“N”
Dimension
“C”
Standard Lengths
(distance between
hub flanges)
Installation
Axial Limits
+/-
Axial Capacity
+/-
Recommended Installation Limits ****
Maximum Coupling Parallel Misalignment Max Angular
Misalignment
Between Hubs (X-Y)
Parallel Alignment Total
Indictor Reading (TIR)*
(P) Installation Limit
Parallel Offset **
Std Hub Min.
(in)
Max.
(in)
Min.
(mm)
Max.
(mm)
(in) (mm) (in) (mm) (in) (mm) (in) (mm) (in) (mm) (in) (mm) (in) (mm)
494 2.76 70.0 0.33 0.35 8.3 8.8
3.50 88.9
0.012 0.30 0.024 0.6
0.011 0.27 0.005 0.13
0.004 0.10
3.75 95.3 0.011 0.29 0.006 0.14
3.94 100.0 0.012 0.30 0.006 0.15
5.00 127.0 0.015 0.38 0.008 0.19
5.51 140.0 0.017 0.42 0.008 0.21
644 3.35 85.0 0.33 0.35 8.3 8.8
3.50 88.9
0.017 0.43 0.033 0.9
0.011 0.27 0.005 0.13
0.004 0.10
3.75 95.3 0.011 0.29 0.006 0.14
3.94 100.0 0.012 0.30 0.006 0.15
5.00 127.0 0.015 0.38 0.008 0.19
5.51 140.0 0.017 0.42 0.008 0.21
726 3.74 95.0 0.33 0.35 8.3 8.8
3.50 88.9
0.026 0.65 0.051 1.3
0.009 0.23 0.005 0.12
0.005 0.13
3.75 95.3 0.010 0.25 0.005 0.12
5.00 127.0 0.013 0.33 0.007 0.17
3.94 100.0 0.010 0.26 0.005 0.13
5.51 140.0 0.014 0.36 0.007 0.18
826 4.25 108.0 0.36 0.38 9.1 9.6
3.50 88.9
0.030 0.75 0.059 1.5
0.009 0.23 0.005 0.12
0.006 0.15
3.75 95.3 0.010 0.25 0.005 0.12
5.00 127.0 0.013 0.33 0.007 0.17
3.94 100.0 0.010 0.26 0.005 0.13
5.51 140.0 0.014 0.36 0.007 0.18
996 5.08 129.0 0.37 0.39 9.3 9.9
4.38 111.3
0.035 0.89 0.070 1.8
0.011 0.29 0.006 0.14
0.007 0.18
5.00 127.0 0.013 0.33 0.007 0.17
3.94 100.0 0.010 0.26 0.005 0.13
5.51 140.0 0.014 0.36 0.007 0.18
7.09 180.0 0.018 0.47 0.009 0.23
1088 5.51 140.0 0.40 0.42 10.1 10.7
4.38 111.3
0.025 0.65 0.051 1.3
0.007 0.19 0.004 0.09
0.005 0.13
4.72 120.0 0.008 0.20 0.004 0.10
5.00 127.0 0.009 0.22 0.004 0.11
5.51 140.0 0.009 0.24 0.005 0.12
7.09 180.0 0.012 0.31 0.006 0.15
1298 6.54 166.0 0.50 0.52 12.6 13.3
4.72 120.0
0.031 0.77 0.061 1.6
0.008 0.20 0.004 0.10
0.006 0.15
5.00 127.0 0.009 0.22 0.004 0.11
5.51 140.0 0.009 0.24 0.005 0.12
7.09 180.0 0.012 0.31 0.006 0.15
1548 7.76 197.0 0.57 0.59 14.4 15.1
5.00 127.0
0.037 0.93 0.073 1.8
0.009 0.22 0.004 0.11
0.007 0.18
7.50 190.5 0.013 0.32 0.006 0.16
8.00 203.2 0.014 0.35 0.007 0.17
5.51 140.0 0.009 0.24 0.005 0.12
7.09 180.0 0.012 0.31 0.006 0.15
9.84 250.0 0.017 0.43 0.008 0.21
1698 8.58 218.0 0.61 0.64 15.4 16.2
7.50 190.5
0.040 1.02 0.080 2.0
0.013 0.32 0.006 0.16
0.008 0.20
8.00 203.2 0.014 0.35 0.007 0.17
7.09 180.0 0.012 0.31 0.006 0.15
9.84 250.0 0.017 0.43 0.008 0.21
1928 9.66 245.4 0.66 0.69 16.7 17.4
7.50 190.5
0.046 1.16 0.091 2.3
0.013 0.32 0.006 0.16
0.009 0.23
8.00 203.2 0.014 0.35 0.007 0.17
9.00 228.6 0.015 0.39 0.008 0.19
7.09 180.0 0.012 0.31 0.006 0.15
9.84 250.0 0.017 0.43 0.008 0.21
2068 10.39 264.0 0.71 0.74 18.0 18.8
7.50 190.5
0.049 1.23 0.097 2.5
0.013 0.32 0.006 0.16
0.010 0.25
8.00 203.2 0.014 0.35 0.007 0.17
9.00 228.6 0.015 0.39 0.008 0.19
7.09 180.0 0.012 0.31 0.006 0.15
9.84 250.0 0.017 0.43 0.008 0.21
2278 11.44 290.5 0.74 0.77 18.8 19.5 9.00 228.6 0.054 1.36 0.107 2.7 0.015 0.39 0.008 0.19 0.011 0.28
9.84 250.0 0.017 0.43 0.008 0.21
2468 12.32 313.0 0.79 0.82 20.1 20.8 9.00 228.6 0.058 1.47 0.116 3.0 0.015 0.39 0.008 0.19 0.012 0.30
9.84 250.0 0.017 0.43 0.008 0.21
2698 13.50 343.0 0.91 0.94 23.0 23.9 9.84 250.0 0.064 1.61 0.127 3.2 0.017 0.42 0.008 0.21 0.013 0.33
2888 14.61 371.0 0.97 1.01 24.7 25.6 9.84 250.0 0.068 1.73 0.136 3.5 0.017 0.43 0.008 0.21 0.014 0.36
3058 15.55 395.0 0.97 1.01 24.7 25.6 9.84 250.0 0.072 1.83 0.144 3.7 0.017 0.43 0.008 0.21 0.015 0.38
3358 16.81 427.0 1.06 1.09 27.0 27.7 9.84 250.0 0.079 2.01 0.158 4.0 0.017 0.43 0.008 0.21 0.016 0.41
3668 18.35 466.0 1.18 1.21 29.9 30.8 15.00 381.0 0.087 2.20 0.173 4.4 0.026 0.65 0.013 0.32 0.018 0.46
3908 19.29 490.0 1.18 1.21 29.9 30.8 15.00 381.0 0.092 2.34 0.184 4.7 0.026 0.65 0.013 0.32 0.019 0.48
4178 20.63 524.0 1.25 1.30 31.9 33.0 15.00 381.0 0.099 2.50 0.197 5.0 0.026 0.65 0.013 0.32 0.020 0.51
4588 23.11 587.0 1.40 1.43 35.5 36.4 18.00 457.2 0.108 2.74 0.216 5.5 0.031 0.78 0.015 0.39 0.022 0.56
4918 24.80 630.0 1.48 1.52 37.6 38.6 18.00 457.2 0.116 2.95 0.232 5.9 0.031 0.78 0.015 0.39 0.024 0.61
5258 26.46 672.0 1.56 1.61 39.7 40.8 18.00 457.2 0.124 3.15 0.248 6.3 0.031 0.78 0.015 0.39 0.025 0.64
Table 4 – Alignment Values
*Parallel Misalignment measured by rotating the hubs with a dial indicator on the outside hub diameter will result in a maximum TIR.
For sizes 494-644 use 0.003 inch per inch of "C" dimension (or 0.010 mm per mm of "C" dimension) for non-standard "C" dimensions. Multiply "C" x 0.003 to calculate the TIR.
For sizes 726-996 use 0.0026 inch per inch of "C" dimension (or 0.008 mm per mm of "C" dimension) for non-standard "C" dimensions. Multiply "C" x 0.0026 to calculate the TIR.
For sizes 1088-5258 use 0.0017 inch per inch of "C" dimension (or 0.004 mm per mm of "C" dimension) for non-standard "C" dimensions. Multiply "C" x 0.0017 to calculate the TIR.
** Parallel Offset "P" is equivalent to one-half of the TIR measurement using dial indicators.
**** During installation and/or operation, do not exceed the maximum misalignment capacity of coupling.
For sizes 494-644 maximum misalignment capacity of coupling is 2/3º per disc pack.
For sizes 726-996 maximum misalignment capacity of coupling is 1/2º per disc pack.
For sizes 1088-5258 maximum misalignment capacity of coupling is 1/3º per disc pack.
Note:
1. Refer to Rexnord Bulletin 538-214 Coupling Alignment Fundamentals for more details regarding alignment methods and procedures.
a. The Angular Misalignment value is the maximum difference between the measurements X and Y taken at opposite ends of the hub flanges,
as shown in Figure 10.
b. The Parallel Misalignment value “P” is the offset between the centers of the hubs, as shown in Figure 8.

Thomas®XTSR52 Installation and Maintenance
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CP3-002
September 2017
Supersedes 09-2016
Rexnord
5555 S. Moorland Rd., New Berlin, WI 53151-7953
Phone: [phone] Fax: [phone] www.rexnord.com
8. Final Assembly
8.1 Verify that the hubs have been mounted as shown in Figure 4 to provide the correct “C” length as defined in Table 1. The “C” length is the distance
measured between the faces of the two mounted hub flanges.
If your coupling assembly has a non-standard “C” length refer to assembly drawing of coupling to obtain the appropriate “C” length.
Any disc packs fastened with correct torques between an adapter and a center member should stay fastened.
8.2 If any disc packs are still fastened to the center member and a hub without an adapter, remove the locknuts, overload bushings, and bolts.
8.3 Due to the hub-to-adapter piloting feature when using an oversize hub option, the center member subassembly must be compressed to allow it to
be slipped between the two end hubs. Use the hub-to-adapter cap screws (provided) as defined in Table 2 to compress the center member assembly
by inserting them through the holes in the flanges of the center spool and threading them into the adapter tapped holes as shown in Figure 11B.
8.4 With the hubs mounted, put the center member into place between the two hubs. Hubs with adapters are assembled to the adapters with the cap
screws, lining up the tapped holes in the adapter with the cap screw clearance holes in the hub. If the coupling was assembly balanced, also align
any match marks.
8.5 Place disc pack between the flange of the adapter (or hub if no adapter) and the flange of the spacer and align the bolt holes of the disc pack to the
holes in the adapter (or hub if no adapter) and spacer.
8.6 Lubricate the cap screw threads and insert the cap screws through the hub flange clearance holes and into the mating threaded holes in the adapter.
Tighten each cap screw to the torque as listed in Table 5.
8.7 Remove the cap screws from the spacer flange to adapter, allowing the hub outside diameter to make contact with the pilot diameter of the adapter.
When aligning bolt holes ensure that at each bolt hole position one of the bolt holes in the flanges is the small fitted bolt hole and
the other one in the opposing flange is the large clearance hole as shown in Figure 11.
8.8 Push bolt through small diameter bolt hole and through disc pack until body of bolt is in contact with disc pack bushing.
8.9 Place overload bushing on threaded side of bolt through large diameter flange hole.
8.10 Apply a clean motor oil to the bolt threads and screw a locknut onto each bolt until hand tight.
8.11 Repeat steps 8.6 through 8.10 until all cap screws, bolts, overload bushings, and locknuts are in place.
8.12 Proceed to the other end of the coupling. Remove the support bolts, if used, and continue to support the center member. Repeat steps 8.5 through
8.10 to install the second disc pack.
All bolt threads must be lubricated prior to assembly. A clean motor oil is recommended. Do not use lubricants containing
molybdenum disulfide or greases.
Figure 11 – Disc Pack Bolt Configuration if no adapter
Figure 11C – Disc Pack Bolt Configuration if adapter
Figure 11B - Using Cap Screws for compression if adapter
CENTER MEMBER
COMPRESSION
SCREW (USE
ADAPTER CAP
SCREW)
ADAPTER
Tighten the cap screws equally to compress the disc pack only enough to allow
the center member subassembly to fit between the hubs (do not tighten more
than necessary to provide clearance for assembly).
ADAPTER ASSEMBLY
DISCPACK
BOLT
BOLT HOLE
LOCKNUT
CENTER MEMBER
OVERLOAD BUSHING
CLEARANCE HOLE

Thomas®XTSR52 Installation and Maintenance
(Page 11 of 13) Sizes 494-5258
CP3-002
September 2017
Supersedes 09-2016
Rexnord
5555 S. Moorland Rd., New Berlin, WI 53151-7953
Phone: [phone] Fax: [phone] www.rexnord.com
8.13 Slightly tighten all locknuts using an alternating progressive pattern on each disc pack as shown in Figures 13 and 14 making sure the disc pack
is not distorted and all the bolts are fully seated. Tighten each locknut to the appropriate torque value shown in Table 6, using an incremental
torque in a progressive alternating pattern as shown in Figures 13 and 14.
As a guide, measure the distance between flanges known as dimension “N” shown in Figure 7 and given in Table 4.
PRECAUTION
Remove any dust deposits from the coupling components and the coupling elements in an appropriate way for explosive environments.
If your coupling utilizes a short center member with scalloped flanges (clearance hole area removed) follow these supplemental
instructions to aid in assembly.
8.14 In the event the coupling utilizes a scalloped version center member you will need to pre assemble the disc packs to the center member before
installing it between the mounted hubs as shown in Figure 12.
8.15 Place Disc against the scalloped flange of center member and align the bolt holes of the disc pack to the holes in the spacer flange as shown in
Figure 14.
8.16 Start bolt through bolt hole in spacer flange until body of bolt is in contact with disc pack washer. The threaded portion of the bolt is not exposed
on other end of disc pack.
8.17 Repeat on other side of spacer for remaining bolt holes.
8.18 Place center member between mount hubs and push pre-installed bolts through disc pack and into clearance holes of mounted hubs.
8.19 Continue spacer installation by following instructions 8.6 through 8.12.
Figure 12 - Short “C” Length Scalloped Center Member
“C” Length

Thomas®XTSR52 Installation and Maintenance
(Page 12 of 13) Sizes 494-5258
CP3-002
September 2017
Supersedes 09-2016
Rexnord
5555 S. Moorland Rd., New Berlin, WI 53151-7953
Phone: [phone] Fax: [phone] www.rexnord.com
XTSR52
Coupling
Size
“A”
Dimension
LH Hub
Cap Screw for LH Hub "A" Dimension
XL Hub
Cap Screw for XL Hub “A”
Dimension
XXL Hub
Cap Screw for XXL Hub
Size
(mm)
Torque Wrench
Size
(mm)
Size
(mm)
Torque Wrench
Size
(mm)
Size
(mm)
Torque Wrench
Size
(mm)
(in) (mm) (lb-ft) (Nm) (in) (mm) (lb-ft) (Nm) (in) (mm) (lb-ft) (Nm)
494 2.77 70 M5x20 6.3 8.5 83.36 85 M5x20 6.3 8.5 8--- --- --- --- --- ---
644 3.36 85 M5x20 6.3 98--- --- --- --- --- --- 4.25 108 M6x20 12.3 17 10
726 --- --- --- --- --- --- 4.25 108 M6x20 12.3 16.7 10 5.08 129 M8x25 27 36 13
826 4.25 108 M6x20 12.3 16.7 10 5.08 129 M8x25 27 36 13 5.51 140 M6x25 12.3 16.7 10
996 5.08 129 M8x25 27 36 13 5.51 140 M6x25 12.3 16.7 10 6.54 166 M8x30 27 36 13
1088 5.51 140 M6x25 12.3 16.7 10 6.54 166 M8x30 27 36 13 7.83 199 M10x35 51 69 15
1298 6.54 166 M8x30 27 36 13 7.83 199 M10x35 51 69 15 8.66 220 M10x40 51 69 15
1548 7.83 199 M10x35 51 69 15 8.66 220 M10x40 51 69 15 9.66 245 M12x40 92 124 16
1698 8.66 220 M10x40 51 69 15 9.66 245 M12x40 92 124 16 10.39 264 M12x40 92 124 16
1928 9.66 245 M12x40 92 124 16 10.39 264 M12x40 92 124 16 11.44 291 M12x50 92 124 16
2068 10.39 264 M12x40 92 124 16 11.44 291 M12x50 92 124 16 12.32 313 M14x50 142 193 18
2278 11.44 291 M12x50 92 124 16 12.32 313 M14x50 142 193 18 13.58 345 M12x60 92 124 16
2468 12.32 313 M14x50 142 193 18 13.58 345 M12x60 92 124 16 15.00 381 M14x70 142 193 18
2698 13.58 345 M12x60 92 124 16 15.00 381 M14x70 142 193 18 15.94 405 M14x70 142 193 18
2888 15.00 381 M14x70 142 193 18 15.94 405 M14x70 142 193 18 17.20 437 M16x70 218 295 21
3058 15.94 405 M14x70 142 193 18 17.20 437 M16x70 218 295 21 18.98 482 M16x80 218 295 21
3358 17.20 437 M16x70 218 295 21 18.98 482 M16x80 218 295 21 19.80 503 M16x80 218 295 21
3668 18.98 482 M16x80 218 295 21 19.80 503 M16x80 218 295 21 20.83 529 M16x80 218 295 21
3908 19.80 503 M16x80 218 295 21 20.83 529 M16x80 218 295 21 23.94 608 M20x90 427 579 27
4178 20.83 529 M16x80 218 295 21 23.94 608 M20x90 427 579 27 25.51 648 M20x100 427 579 27
4588 23.94 608 M20x90 427 579 27 25.51 648 M20x100 427 579 27 26.69 678 M20x110 427 579 27
4918 25.51 648 M20x100 427 579 27 26.69 678 M20x100 427 579 27 --- --- --- --- --- ---
5258 26.69 678 M20x110 427 579 27 --- --- --- --- --- --- --- --- --- --- --- ---
Table 5 – Flange Hex Head Cap Screw Tightening Torques
Note: These torque values are approximate for Cap screws with lubricated threads.
9. Disc Pack Replacement
If it becomes necessary to replace the disc packs, it can be done as follows:
Note: Center member subassemblies with adapters have their locknuts factory tightened. On center member subassemblies where
the spacer length is short and wrench access is limited, special wrenches are used to tighten the locknuts. Consult Rexnord for
assistance in obtaining special wrenches.
9.1 Remove the center member subassembly by removing all cap screws from hubs to compress the center member assembly by inserting them
through the holes in the flanges of the center spool and threading them into the adapter tapped holes as shown in Figure 11B and dropping the
center member assembly out from between the hubs. There are jacking screw tapped holes in each end hub to disengage the pilots between the
hubs and adapters, using the hub to adapter cap screws as defined in Table 5.
9.2 Remove all locknuts, bolts, bushings, and disc packs. Special wrenches may be required. Clean the two adapters and the center spool, removing any
nicks and burrs.
9.3 Install the disc packs to the adapter first so that the washer heads of the disc pack line up with the bolt holes in the adapter as shown in Figure 11C.
Insert the bolts through the adapter bolt holes and disc pack. Match marks (if applied at assembly balance) must be in-line to maintain balance.
9.4 Proceed to install the center member subassembly as outlined in the Final Assembly section 8.

Thomas®XTSR52 Installation and Maintenance
(Page 13 of 13) Sizes 494-5258
CP3-002
September 2017
Supersedes 09-2016
Rexnord
5555 S. Moorland Rd., New Berlin, WI 53151-7953
Phone: [phone] Fax: [phone] www.rexnord.com
When possible, it is recommended that all locknuts have their tightening torque checked after several hours of initial operation.
For spare replacement parts, see Tables 1 and 2.
Table 6 – Lock Nut Tightening Torque
XTSR52
Coupling Size
"A" Dimension Std Hub Locknut
Bolt Size
(mm)
Torque Wrench
Size (in)
(in) (mm) (ft-lb) (Nm)
494 2.76 70.0 M5 4.7 6.4 8
644 3.35 85.0 M5 4.7 6.4 8
726 3.74 95.0 M5 4.7 6.4 8
826 4.25 108.0 M6 8.1 11 11
996 5.08 129.0 M8 18 24 14
1088 5.51 140.0 M8 18 24 15
1298 6.54 166.0 M10 39 53 18
1548 7.76 197.0 M12 66 90 21
1698 8.58 218.0 M14 110 150 22
1928 9.66 245.4 M16 162 220 24
2068 10.39 264.0 M18 236 320 27
2278 11.44 290.5 M20 266 360 30
2468 12.32 313.0 M22 384 520 32
2698 13.50 343.0 M24 575 780 36
2888 14.61 371.0 M27 885 1200 41
3058 15.55 395.0 M27 885 1200 41
3358 16.81 427.0 M30 1200 1600 46
3668 18.35 466.0 M33 1500 2000 50
3908 19.29 490.0 M33 1500 2000 50
4178 20.63 524.0 M36 2100 2800 55
4588 23.11 587.0 M42 3200 4400 65
4918 24.80 630.0 M45 4100 5600 70
5258 26.46 672.0 M48 4900 6700 75
Notes:
1. These torque values are approximate for steel bolts with lubricated threads.
2. Bolts should be held from rotating while the locknuts are tightened to the values shown. Do not tighten the fastener by rotating the bolt head.
Figure 13 Figure 14
3
3
7
5
8 5
2
2
6
6
1 14
4