WAGNER ZR26-I User manual

Operating Manual
Thread Cutting Head ZR26-I
Article-No. 74424300

Table of Contents
1. Preface 3
2. Security advice 5
3. Product description 6
3.1. Use 6
3.2. Mode of operation 6
4. Chaser holders 8
4.1. Tasks 8
4.2. Labelling 8
5. Chasers 9
5.1. Tasks 9
5.2. Design of the chasers 9
5.3. Polished section of the chaser 11
6. Equipment 15
6.1. The fixture 15
6.2. The setting device 15
7. Setting of the chasers in the chaser holder 16
7.1. Determination of the setting value 16
7.2. Holder tables 19
7.3. Insertion and setting of the chasers 21
8. Installation of the chaser holders 22
9. Presetting of the thread diameter 23
10. Mounting of the cutting head onto the machine 24
11. Operation sequence of the thread holders 25
12. Control paths 26
13. Thread cutting and diameter fine adjustment 28
14. Cutting speed 29
14.1. Choice of the cutting speed 29
14.2. Calculation 29
14.3. Choice of the infeed 29
15. The coolant 30
16. Maintenance 31
16.1. Disassembling 31
16.2. Mounting 31
16.3. Verifying of the mode of operation 32
16.4. Exploded assembly drawing ZR 26-I 33
16.5. Spare parts list of WAGNER® Cutting Head ZR 26-I 34
17. Defects and causes thereof 36
2 Operating Manual ZR 26-I

1. Preface
Dear customer,
You have purchased a high-quality technical tool which guarantees you an efficient
work performance.
The cutting heads of our company are widely known for their high quality and long-
life cycle.We do hope that you are perfectly satisfied with our products, too.
Customer care even after purchase:
This operating manual helps you to make the first steps with the new WAGNER®pro-
duct. It helps to understand its
Function and alludes to possible hazards.
However, should you be in need of further consulting service, training or some other
advice do not hesitate to contact us.
Even if you are not happy with one of our WAGNER®products!
Our marketing staff is more than glad to help you at anytime.
This operating manual should be read, understood and paid attention to by every
person in charge.
In particularly this applies for safety- and hazard warnings which are specially indi-
cated. (See chapter 2.0 safety warnings)
Following these advices helps to avoid accidents and faults.
This manual provides all information on operation and maintenance of your WAG-
NER®Thread cutting head. The information laid down in this manual is state of the
art according to the production date of the product.
Please use only this manual when working with the thread cutting head. The Wagner
Tooling Systems Baublies GmbH reserves the right to technical amendments regar-
ding the improvement of this product. However, the Wagner Tooling Systems Bau-
blies GmbH cannot held liable for any faults, damages, failures and production loss
resulting thereof caused by disregarding of some aspects mentioned in this manual.
Due to copyright reasons we would like to point out that this operating manual is for
internal use only. Please refrain from distributing it to third parties.
In addition to the instructions mentioned before, national and international "safety
instructions and rules for accident prevention" apply when operating and maintaining
the cutting head. The operating manual, in particular, the "safety instructions" have
to be read carefully. Through observing the safety instructions and legal regulations
damage to persons, mechanical breakdown and damage to the cutting head should
be avoided.
Warranty
We warrant perfect function of the thread cutting heads when purchasing and using
original WAGNER®spare parts and equipment.
We cannot hold liable for any damage to persons, mechanical breakdown and da-
mage to the thread cutting head ZR 26-I in the event of:
• Improper installation and operation
• Usage of non original spare parts
• Removal of component parts and screws
• Unauthorised modifications of our products
• Usage of damaged cutting heads.
Please note:
Read this operating manual
carefully before initial ope-
ration and take note of the
hazard warnings!
Operating Manual ZR 26-I 3
Preface

We cannot hold liable for any use of components which are not manufactured or not
approved by WAGNER®.
We cannot hold liable for damages occurring through removing of safety devices of
the machine. We imply the placing into operation of our products on efficient tech-
nical machines.
Normal use:
Don’t use force when mounting, dismounting and operating the cutting head. Other-
wise you will cause damages to the cutting head or the machine.
Initial operation
Check the function of the thread cutting head before initial operation.
Limitation of liability:
Please note: Use this pro-
duct only for the purpose it
is manufactured for!
Please take notice of the
safety instructions and ha-
zard warnings! The thread
cutting head ZR 26-I should
only be used by trained
technical staff. Otherwise
health hazard or danger of
life and damage to property
cannot be ruled out. In that
case we cannot hold liable
for any of these damages.
4 Operating Manual ZR 26-I
Preface

2. Security advice
• Persons operating, maintaining or servicing the cutting head should always
read and understand the operating manual in particular the safety inst-
ructions. Persons under the influence of alcohol and /or drugs may cause
accidents!
• Take into account the weight of the thread cutting head upon installation. If
necessary lift it with a lifting gear.
• Please take note that the cutting sites between tool and machine are kept
clean. Should they be fouled the accuracy of the workpiece is affected.
• When installing the tools switch off the machine at the line switch. When
changing the chaser holders and chasers take note that the tool shaft isn’t
starting unexpectedly.
• Remove all tools and testing equipment from the workspace of the machine
before activating it. Risk of injury arises through tools and testing equipment
which are flung about!
• Close guard door or protection case before machining. Flying chipping and
damaged tools or workpieces can cause damage to persons or mechanical
breakdown.
• Make sure that the thread cutting head isn’t loosening when machining.
• Don’t touch the cutting head upon closing. Don’t touch rotating tools: Risk of
injury!
• Be very careful when dealing with the chasers. The edges of the chasers are
very sharp. Wear safety gloves if necessary!
• Please ensure that the thread cutting head is properly secured and attached
whilst transporting.
Operating Manual ZR 26-I 5
Security advice

3. Product description
3.1. Use
By using the thread cutting head ZR 26-I non-cutting external threads with a nominal
diameter of 5 to 26 mm with a maximum flank lead of 2,5 mm can be cut.
The thread length is limited to 80 mm including the thread runout.
Fine threads with a diameter of 27 and 30 mm and a maximum flank lead of 2 mm
can be cut until a thread length of 27 mm including the thread runout.
Left-handed and right-handed threads may be cut. Please note when cutting left-
handed threads to use fitting chasers and the chaser holders. The tool spindle should
be set to anticlockwise rotation.
Conical external threads having a cone infeed can be cut provided that the thread
length including run-out isn’t longer than the width of the chasers. As the load of the
tool is quite high this method can be used for fine threads only. Four axial marks can’t
be avoided here.
3.2. Mode of operation
The Thread Cutting Head ZR 26-I with internal control is designed for the fast and
effective production of external threads on machine tools with connecting rod.
All required mechanical movements like »closing head«, »opening head« and »fine
adjustment of the diameter« are carried out by the connecting rod.
The suitable adapters for the machine and the coupling for the rod are delivered with
the thread cutting head.
The coolant for internally cooled tools is supplied via the adapter or centrally via the
connecting rod.
Figure 1: Main components of thread cutting head ZR26-I
thread cutting head
chaser holder with chasers
flank
coupling for rod
6 Operating Manual ZR 26-I
Product description

We will deliver the matching connecting bead for the machine and the fitting for the
connecting rod with the thread cutting head. The thread head offers all the mecha-
nical motional processes.
Through axial switching of the unit »guide ring and excentric ring« on the base body,
the chaser system will be triggered by the chamfers of the excentric ring and the sli-
ding pieces of the chaser holders.
The four bores of the base body are the die of the chaser holders whose axial guidance
adopts the central support guidance of the base body.
The chaser holders will be pressed outwards up to the installation of the excentric ring
by means of the spring mounted pressure sockets.
Figure 2: Mode of operation
sliding piece chamfer
Unit:
Guide- and eccentric ring
pressure sockets
Base body with chaser holder guidance
eccentric ring
Operating Manual ZR 26-I 7
Product description

4. Chaser holders
4.1. Tasks
The chaser holders function as a die for the chasers to mount them as cutting de-
vice.
They are thus designed that you may cut various threads within a certain range of
diameter- and lead angle with only one set of holders.
Please refer to the table of threads and holders on the pages 19 to 20 for more in-
formation concerning the suitable types of holders for the threads.
Should one of the threads not be listed in the tables, the holder can be chosen accor-
ding to the core diameter and the lead angle of the thread.
Please note that the core diameter of the thread and the angle of the holder should
approximately correspond to the lead angle of the thread.
Lead angle ≤ angle of the holder ≤ lead angle + 1°
Please note:
Only chaser holders with the same serial number may be used in one set of
holders.
Due to manufacturing reasons chaser holders are not available separate but
as a set.
4.2. Labelling
Figure 3 shows the labelling of the chaser holders including holder marking and
serial number.
Figure 3: Labelling of the
chaser holders
holder marking
ZR 26/ D- 4.0°: holder type and holder angle
KD 1.0 -9.8: minor diameter section
744834: serial number
serial number
8 Operating Manual ZR 26-I
Chaser holders

5. Chasers
5.1. Tasks
Thread- and holder tables:
see page 19 to 20
The actual chipping tool is the chasers.
They are fitted with a plain thread profile
which means threads with various diameters
and the same lead can be cut with just one set
of holders.
For instance M6, M8x1 and M12 x1 in which
according to the different lead angles and
diameters various types of holders have to be
installed.
You should choose the chasers according to the size of the chasers (compatible to the
chaser holder), the designated lead, the material and the valid thread run out.
5.2. Design of the chasers
Size of chasers
The chasers are manufactured in various sizes (width and length).
Two sizes of threads are installed in the cutting head ZR 26-I:
• size of chaser S02 (14.5 x 6.5 X 32)
For cylindrical threads and short conical threads
• size of chaser S09 ( 22 x 7 x 32 )
Mainly for conical threads
Please refer to the holder table in the annex for the required size of the chasers.
Chaser profile
The chaser profile consists as mentioned before of parallel grooves which correspond
to the profile of the thread to be cut.
Example:
Metric profile with lead angle of 60° according to DIN 13, or Whitworth profile ac-
cording to ISO 228 resp. to B.S. 84 with lead angle of 55°.
Chaser first cut
The chasers are manufactured with various first cuts in order to meet the different
operating conditions. This first cut is not being altered and lasts for the whole service
performance of the chaser.
First cut extra short:
For workpieces without oversize with a thread against the collar and very short thread
run out
Thread run out approximately 1, 5 x lead
Only suitable for free- cutting workpieces
Figure 4: Chaser first cuts long, middle, short
Operating Manual ZR 26-I 9
Chasers

First cut short:
For workpieces with a thread against the collar and short thread run out
Thread run out approximately 2 x lead.
First cut medium:
For workpieces without or little oversize, blank or preturned
Thread run out approximately 3 x lead.
First cut long:
For workpieces made of rolled material or with oversize.
Thread run out approximately 4-5 x lead.
Please note:
By means of a longer first cut you will receive a better surface of the threads
and a better lifetime.
Please pay attention when choosing the first cut that the cheek of the chasers won’t
touch the collar of the workpiece. They run the risk to break.
Labelling of the chasers:
On the cheek of the chaser the design of the chaser, the chaser lead and the number
of the chaser (1-4) within a set is engraved.
Examples for thread labelling on the chaser:
M 0, 7 P
Chaser for all metric ISO- threads according to DIN 13 with lead of 0, 7 mm
W 28 GG
Chasers for all Whitworth threads according to ISO 228 resp. B.S. 84 for threads
according to DIN 11 with lead of 28 movements per inch and all cylindrical Whit-
worth- pipe threads according to DIN 259 with lead of 28 movements per inch.
R 28 GG K 1:16
Chasers for all conical Whitworth pipe threads with taper 1:16 according to DIN
2999 and 3858 with lead of 28 movements per inch.
If the chasers are labelled with an additional manufacturing number (set number),
only chasers with the same numbering should be used in the set.
Chasers without set number are interchangeable among each other.
Figure 6:
Labelling of the chasers
Figure 5: Chaser first cuts
set number
chaser number
1- resp. 2-3-4
pitch
profile design
10 Operating Manual ZR 26-I
Chasers

Chaser material
The chasers will be manufactured in the grades HSS and HSSE. HSSE is
recommended when the strength of the material exceeds 900 N/mm².
All chasers are available as nitrided or coated version.
5.3. Polished section of the chaser
On the front side of the chaser the chipping- and the grinding angle
are grinded which constitutes the grinding area.
The cutter can be resharpened when getting blunt or showing nicks.
The chasers are resharpened in the same way as common tools. Only
a few points have to be noted which characterize tangential chasers.
A variety of angles which are relevant for thread cutting need to be
noted:
α= clearance angle
β= wedge angle
γ= chip angle
δ= grinding angle
Figure 7: Angle at chaser
Grinding scope
The resharpening of the chasers can be done on every all-purpose tool machine.
WAGNER® provides you with a clamping device which will enable you to mount the
chasers and to set the relevant angles.
Should you not be in possession of a tool grinding machine we recommend you use
a WAGNER®chaser skiving machine.
As cup wheels we do recommend conical cup wheels EKW 60 Jot with edge reinforce-
ment. They are available from WAGNER®.
When grinding chasers with low thread profiles it is very useful to adjust an illumina-
ted magnifier at the grinding device.
The choice of the chip angle
The degree of the chip angle is dependent on the material, the lubricant, the coolant
and the cutting speed as always when machining.
The chasers are delivered with a standard chip angle of 20°
The following table provides some reference values for resharpening of the chip ang-
le dependent on the material of the workpiece:
Material Reference value of the chip angle in °
Machining steel 16 - 25
Construction steel up to 500 N/m² 16 - 28
Construction steel from 500N/m² 16 - 25
High- alloyed steel (Stainless steel) 22 - 28
Pipes 20 - 28
Annealed cast iron fittings 15 - 22
Grey cast iron 10 - 20
MS 58 4 - 10
MS 60-62 8 - 20
Bronze 8 - 20
Copper 20 - 30
Aluminium alloy 18 - 30 Table 1: Chip angles
Operating Manual ZR 26-I 11
Chasers

In special cases for instance steels with low strength (e.g. elastic limit 37) stainless
steel, copper or aluminium it might be better not to grind the chip surface as a plain
area but to grind a radius. This radius the so-called undercut enables the discharge
of chips here.
The choice of the grinding angle
The grinding angle is in a certain ratio to the thread profile and equals the support
angle, the infeed chamfer and the cutting angle insofar that the cutter is running pa-
rallel to the axis of the workpiece. Thus a perfect thread profile can be cut.
The grinding angle consists of the support angle and an additional angle.
Grinding angle = holder angle + supplementary angle
The chasers with short and extra short infeed are delivered with a standard
grinding angle of 7°. The chasers with medium and long infeed are delivered
with a grinding angle of 5°.
The following table provides you with information on the additional angle for sharp
threads with normal infeeds. It applies for the most common cutting angles from 20°
to 25°:
Cutting angle Supplementary angle for
long throat medium throat short throat
20° 3,0° 3,5° 5,0°
25° 3,8° 4,5° 6,5°
In order to calculate the additional angle for other cutting angles and special first cuts
the following alignment chart applies: (Figure 8)
All you have to do is to read off the first cut or the correspondent first cut angle on
the right scale. Then draw a line covering the corresponding cutting angle from the
middle scale to the left scale. There you can read off the additional angle.
The choice of the grinding angle:
In special cases where cylindrical threads are cut without a guiding presser foot there
is no additional angle.
Therefore the grinding angle = holder angle
When cutting conical threads to the width of chasers which is done without a guiding
presser foot an additional angle is needed, too. It is necessary to equal the tapering
of the chaser in order to bring the cutting edge in a parallel position to the axis of the
workpiece. This additional angle amounts to 1° on a thread with a cone 1:16.
Checking of the grinding angle with the setting device
Table 2:
Supplementary angle
Figure 8:
Alignment chart for deter-
mining the supplementary
angle
12 Operating Manual ZR 26-I
Chasers

Aside from these methods of determination the grinding angle can be always che-
cked in the setting device. The cutting edge of the chasers should be parallel to the
foot switch of the flowmeter which runs parallel to the axis of the workpiece.
In practice it became evident that for most workpieces the best results can be achie-
ved when the cutter of the chaser runs parallel to the axis of the workpiece.
In some cases as for instance for "stainless steel" it may be necessary to reduce the
grinding angle, in exceptional cases to have a grinding angle of minus degree.
Whereas we would not recommend to increase its size.
Grinding of the chasers
After choosing the matching angles the chasers can be grinded.
Please heat the chasers reasonably when dry grinding. On no account should they
be cooled in water after grinding. Please note to supply water sufficiently when wet
grinding.
Non-observance can lead to fissures and even cobbling of the cutters of the
chasers.
Grinding without guiding presser foot:
See figure 10.1 and 10.3.
Figure 9:
Checking of the grinding
angle with the setting device
Example:
throat angle: 18° (medium)
cutting angle: 15°
This results in an additional angle of 2.6°
Cutting angle
Operating Manual ZR 26-I 13
Chasers

The chasers are looped in on the face side according to the set angles.
Grinding with guiding presser foot :
See figure 10.2 and 10.4.
The grinding process is divided in two work steps:
Grinding of the guiding presser foot:
The guiding presser foot is looped in. As grinding angle we recommend you appro-
ximately set the value of the holder angle. As cutting angle αvalue between 0° and
the selected cutting angle is set.
This isn’t of great relevance as the sprockets of the guiding presser foot don’t cut,
but are located in front of the centre of the workpiece and are used as guiding only.
Grinding of the cutting sprockets:
The selected, respectively determined angles are now exactly set.
The cutting sprockets are grinded sharply-edged up to the gap between the first and
the second complete cutting sprocket.
It is most important to cut the nook sharply-edged as when grinding the flank of the
first sprocket of the guiding presser foot, a chip pocket is formed which can lead to
cobbling of the sprocket. Moreover, it can create very uneven thread flanks.
The cutting sprockets are cut this deep that the length of the guiding presser foot
amounts to 0, 5 to 1 x lead. Please be informed that too short sprockets don’t provide
enough guidance, too long sprockets can cause chip pockets.
Please pay attention when grinding chasers for multi- start threads that the amount of
entire sprockets is at least the same as the amount of turns of the thread (i.e. should
the thread have 3 turns at least 3 entire sprockets should be grinded).
Figure 10:
Grinding of the chasers
1 Grinding without guiding
presser foot
2 Chaser mould without
guiding presser foot
3 Grinding with guiding
presser foot
4 Chaser mould with guiding
presser foot
14 Operating Manual ZR 26-I
Chasers

6. Equipment
6.1. The fixture
The fixture is used to mount the chasers to enable an accurate grinding of the chasers.
6.2. The setting device
The setting device is used to set the chasers in the chaser holder to the value needed
for the thread to be cut. Please refer to the holder tables for the exact setting values.
Figure 11: Fixture for chasers
Figure 12: The setting device
Operating Manual ZR 26-I 15
Equipment

7. Setting of the chasers in the chaser holder
In order to cut proper threads it is essential to set the chasers evenly in the approp-
riate chaser holders according to the holder table and in the right proportion to the
workpiece. This kind of setting can be compared with the setting of turning steel at
centre height. Please refer to the thread- and holder tables for more information.
7.1. Determination of the setting value
The setting value results from the setting length which is the length from the centre of
rotation of the holder to the tangential point of the minor thread diameter.
Thus the setting length is dependent on the minor thread diameter of the thread.
To simplify the setting of the chasers, the setting lengths are converted into setting
values which are laid down in the holder- and thread tables.
Using the setting device, the setting values are transmitted onto the chasers.
In order to establish the setting value, please refer to the left column of the holder-
and setting table for the thread to be cut.
Thread- and holder
tables:
see page 19-20
To the very right you will come upon the column »setting values« .In this column under
gauge the setting value is indicated.
Referring to these values laid down in the table means that the cutting edge of the
chaser cuts the central part of the workpiece.
In practice, however, it has become evident that this value should be adjusted to the
various materials. The following details are guidelines since other factors such as
centre accuracy of the cutting head/material, carriage and shaft clearance etc. play
an important role, too.
16 Operating Manual ZR 26-I
Setting of the chasers in the chaser holder

The established value from the following table has to be added to the setting value
from the holder table. This value is dependent on the material to cut.
Material or shape of the workpiece Loading in % from thread diameter
Machining steel 1 - 2
Construction steel up to 500 N/m² 1
Construction steel after 500 N/m² 0.5 - 1
High- alloyed steel ( stainless steel) 0 - 0.5
Pipes (cylindrical threads) 0.5 - 2
Pipes (conical threads) 1 - 2
Grey- and cast iron 1 - 2
MS 58 2
MS 63, bronze 0.5 - 2
Copper 0.5 - 1
Aluminium alloy 0.5 - 1
Example:
Table 3: Thread diameters
Figure 13: Setting value and- length of the chaser
Figure 15:
Setting of the chasers
Operating Manual ZR 26-I 17
Setting of the chasers in the chaser holder

Threads M10 x 1
Material 9S 20 K
Setting value from holder table 0.60
+ 1.5 % from diameter 10 0.15
Setting value of the chaser + 0.75
Please note:
Adjust the chasers carefully! Set them up to that point until you won’t notice
the brinelling of the thread anymore. If you set the chasers too far there will
be higher friction between the tool and the workpiece. This will result in in-
tense heating and abrasion.
18 Operating Manual ZR 26-I
Setting of the chasers in the chaser holder

7.2. Holder tables
Metric threads DIN 13
External threads, tolerance 6g Tools setting
value
Thread
indication
Pitch
[mm]
External diameter Flank diameter Minor diameter Chaser holder Chaser
size
maxi-
mum
size
minimum
size
maxi-
mum
size
minimum
size
maxi-
mum
size
minimum
size
Type Article
number
Gauge-Ø
48 mm
M6 1.00 5,974 5,794 5,324 5,212 4,747 4,596 ZR26/D-4,0
KD 1,0-9,8
744 834 00 S 02 4,07
M8x1 1.00 7,974 7,794 7,324 7,212 6,747 6,596 ZR 26/D-2,5
KD 3,8-11,8
744 276 00 S 02 4,04
M8 1.25 7,972 7,760 7,160 7,042 6,438 6,272 ZR 26/ D-4,0
KD 1,0 - 9,8
74483400 S 02 4,05
M10x1 1.00 9,747 9,794 9,324 9,212 8,747 8,596 ZR 26/ D-2,5
KD 3,8 - 11,8
744 276 00 S 02 3,97
M10 1.50 9,968 9,732 8,994 8,862 8,128 7,938 ZR 26/ D-4,0
KD 1,0 - 9,8
744 834 00 S 02 4,00
M12x1 1.00 11,974 11,794 11,324 11,206 10,747 10,590 ZR 26/ D-2,5
KD 6,9 - 14,7
744 270 00 S 02 3,87
M12x1.5 1.50 11,968 11,732 10,994 10,854 10,128 9,930 ZR 26/ D-2,5
KD 6,9 - 14,7
744 270 00 S 02 3,91
M14x1.4 1.50 13,968 13,732 12,994 12,854 12,128 11,930 ZR 26/ D-2,5
KD 6,9 - 14,7
744 270 00 S 02 3,78
M16x1.5 1.50 15,968 15,732 14,994 14,854 14,128 13,930 ZR 26/ D-2,5
KD 6,9 - 14,7
744 270 00 S 02 3,62
M18x1.5 1.50 17,968 17,732 16,994 16,854 16,128 15,930 ZR 26/ D-1,8
KD 14,8 - 22,3
744 272 00 S 02 3,42
M20x1.5 1.50 19,968 19,732 18,994 18,854 18,128 17,930 ZR 26/ D-1,8
KD 14,8 - 22,3
744 272 00 S 02 3,18
M22x1.5 1.50 21,968 21,732 20,994 20,854 20,128 19,930 ZR 26/ D-1,8
KD 14,8 - 22,3
744 272 00 S 02 2,91
M24x1.5 1.50 23,968 23,732 22,994 22,844 22,128 21,930 ZR 26/ D-1,5
KD 21,8 - 29,2
744 274 00 S 02 2,59
M26x1.5 1.50 25,968 25,732 24,994 24,844 24,128 23,920 ZR 26/ D-1,5
KD 21,8 - 29,2
744 274 00 S 02 2,23
Metric threads conical DIN 158-1
External threads, tolerance 6g Tools setting value
Thread indica-
tion
Pitch
[mm]
External
diameter
Flank dia-
meter
Minor dia-
meter
Chaser holder Chaser size
maximum
size
maximum
size
maximum
size
Type Article
number
Gauge-Ø
48 mm
M 6 con. 1.00 5,974 5,324 4,747 ZR26/D-4,0 KD 1,0 - 9,8 744 834 00 S 02 4.10
M 8x1 con. 1.00 7,974 7,324 6,747 ZR26/D-2,5 KD 3,8 -11,8 744 276 00 S 02 4.09
M10x1 con. 1.00 9,747 9,324 8,747 ZR26/D-2,5 KD 3,8 - 11,8 744 276 00 S 02 4.04
M12x1 con. 1.00 11,974 11,324 10,747 ZR26/D-2,5 KD 6,9 - 14,7 744 270 00 S 02 3.95
M12x1.5 con. 1.50 11,968 10,994 10,128 ZR26/D-2,5 KD 6,9 - 14,7 744 270 00 S 02 3.98
M14x1.4 con. 1.50 13,968 12,994 12,128 ZR26/D-2,5 KD 6,9 - 14,7 744 270 00 S 02 3.87
M16x1.5 con. 1.50 15,968 14,994 14,128 ZR26/D-2,5 KD 6,9 - 14,7 744 270 00 S 02 3.72
M18x1.5 con. 1.50 17,968 16,994 16,128 ZR26/D-1,8 KD 14,8 - 22,3 744 272 00 S 02 3.53
M20x1.5 con. 1.50 19,968 18,994 18,128 ZR26/D-1,8 KD 14,8 - 22,3 744 272 00 S 02 3.30
M22x1.5 con. 1.50 21,968 20,994 20,128 ZR26/D-1,8 KD 14,8 - 22,3 744 272 00 S 02 3.04
Unified Threads, ASME B1.1
External threads Tools setting
value
Thread indi-
cation
Lead
[turn/
1 inch]
External diameter Flank diameter Minor diameter Chaser holder Chaser
size
maxi-
mum
size
minimum
size
maximum
size
minimum
size
maximum
size
minimum
size
Type Article
number
Gauge-Ø
48 mm
7/8-14 UNF-2A 14 22.184 21.922 21.006 20.869 20.221 19.690 ZR26/D-1.8
KD14.8-22.3
74427200 S 02 2.91
Operating Manual ZR 26-I 19
Setting of the chasers in the chaser holder

Cylindrical Whitworth pipe threads DIN 259 (ISO 228-1
External threads, tolerance 6g Tools setting
value
Thread
indication
Lead
[turn/
1 inch
External
diameter
Flank diameter Minor diameter Chaser holder Chaser
size
max.
size
min.
size
max.
size
min.
size
max.
size
min.
size
Type Article
number
Gauge-Ø
48 mm
G 1/8 28 9,728 9,514 9,147 9,04 8,566 8,432 ZR 26/ D-2,5
KD 6,9 - 14,7
744 270 00 S 02 3.98
G 1/4 19 13,157 12,907 12,301 12,176 11,445 11,289 ZR 26/ D-2,5
KD 6,9 - 14,7
744 270 00 S 02 3.82
G 3/8 19 16,662 16,408 15,806 15,679 14,950 14,791 ZR 26/ D-1,8
KD 14,8 - 22,3
744 272 00 S 02 3.53
G 1/2 14 20,955 20,671 19,793 19,651 18,631 18,453 ZR 26/ D-1,8
KD 14,8 - 22,3
744 272 00 S 02 3.10
G 3/4 14 26,441 26,157 25,279 25,137 24,117 23,939 ZR 26/ D-1,5
KD 21,8 - 29,2
744 274 00 S 02 2.21
Conical Whitworth pipe threads DIN 2999 (ISO 7/1)
External threads, tolerance 6g Tools setting
value
Thread
indication
Lead
[turn/
1 inch
External
diameter
Flank
diameter
Minor
diameter
distance
reference
plane
useable
thread
length
Chaser holder Chaser
size
Type Article
number
Gauge-Ø
48 mm
R 1/8 K 1:16 28 9,728 9,147 8,566 4 6,5 ZR 26/ D-2,5
KD 6,9 - 14,7
744 270 00 S 02 4.08
R 1/4 K 1: 16 19 13,157 12,301 11,445 6 9,7 ZR 26/ D-2,5
KD 6,9 - 14,7
744 278 00 S22 x 7x 28 3.96
R 3/8 K 1: 16 19 16,662 15,806 14,950 6,4 10,1 ZR 26/ D-1,8
KD 14,8 - 22,3
744 280 00 S22 x 7x 28 3.71
R 1/2 K 1: 16 14 20,955 19,793 18,631 8,2 13,2 ZR 26/ D-1,8
KD 14,8 - 22,3
744 280 00 S22 x 7x 28 3.32
R 3/4 K 1: 16 14 26,441 25,279 24,117 9,5 14,5 ZR 26/ D-1,5
KD 21,8 - 29,2
744 282 00 S22 x 7x 28 2.50
NPT- threads, ANSI/ASME B1. 20.1
External threads, tolerance 6g Tools setting
value
Thread
indication
Lead
[turn/
1 inch
External
diameter
Flank
diameter
Minor dia-
meter
useable th-
read length
Chaser holder Chaser
size
Type Article
number
Gauge-Ø
48 mm
At the pipe end
NPT 1/8 27 10,287 9,233 8,481 6,632 ZR 26/ D-2,5
KD 6,9 - 14,7
744 270 00 S 02 4.08
NPT 1/4 18 13,716 12,125 10,996 10,206 ZR 26/ D-2,5
KD 6,9 - 14,7
744 278 00 S22 x 7x 28 3.98
NPT 3/8 18 17,145 15,545 14,417 10,358 ZR 26/ D-2,5
KD 6,9 - 14,7
744 278 00 S22 x 7 x 28 3,58
NPT 1/2 14 21,336 19,264 17,183 13,556 ZR 26/ D-1,8
KD 14,8 - 22,3
744 280 00 S22 x 7x 28 3.41
NPT 3/4 14 26,670 24,579 23,127 13,861 ZR 26/ D-1,5
KD 21,8 - 29,2
744 282 00 S22 x 7x 28 2.66
Fine threads UNF
External threads, tolerance 6g Tools setting
value
Thread
indication
Lead
[turn/
1 inch
External dia-
meter
Flank diameter Minor diameter Chaser holder Chaser
size
max.
size
min.
size
max. size min.
size
max.
size
min.
size
Type Article
number
Gauge-Ø
48 mm
Nr 5-44 44 3,157 3,035 2,781 2,718 2,449 ZR26/D-4,0 KD 1,0 - 9,8 744 834 00 S 02 4.06
Nr. 6-40 40 3,485 3,355 3,073 3,007 2,705 ZR26/D-4,0 KD 1,0 - 9,8 744 834 00 S 02 4.06
Nr. 8-36 36 4,145 4,006 3,688 3,617 3,279 ZR26/D-4,0 KD 1,0 - 9,8 744 834 00 S 02 4.06
Nr. 10-32 32 4,803 4,651 4,288 4,211 3,830 ZR26/D-4,0 KD 1,0 - 9,8 744 834 00 S 02 4.06
Nr. 12-28 28 5,461 5,296 4,872 4,790 4,348 ZR26/D-4,0 KD 1,0 - 9,8 744 834 00 S 02 4.06
¼ - 28 28 6,325 6,160 5,735 5,652 5,212 ZR26/D-2,5 KD 3,8 - 11,8 744 276 00 S 02 4.06
5/16 - 24 24 7,910 7,727 7,221 7,127 6,612 ZR26/D-2,5 KD 3,8 - 11,8 744 276 00 S 02 4.04
3/8- 24 24 9,497 9,314 8,809 8,712 8,199 ZR26/D-2,5 KD 6,9 - 14,7 744 270 00 S 02 3.99
20 Operating Manual ZR 26-I
Setting of the chasers in the chaser holder