phase II+ 900-385 User manual

Digital Rockwell Hardness Tester
Instruction Manual
21 Industrial Ave • Upper Saddle River, NJ. 07458
Tel: [phone] • Fax: [phone]
E-Mail: [e-mail]
Web Site: http://www.phase2plus.com
Model No. 900-385 Model No. 900-386

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Contents table
1 General description…………………………………………………………... 2
1.1 Scope of application………………………………………………………….. 2
1.2 Product features………………………………………………………………. 2
2 Key performance parameters………………………………………………. 2
3 Basic configuration and structure…………………………………………. 3
3.1 Standard configuration………………………………………………………. 3
3.2 Structure schematic diagram……………………………………………….. 3
4 Installation and adjustment…………………………………………………. 4
5 Operating methods…………………………………………………………… 6
5.1 Testing preparation…………………………………………………………… 6
5.2 Test parameters setting……………………………………………………… 6
5.2.1 Scale selection………………………………………………………………… 6
5.2.2 Load dwell setting…………………………………………………………….. 7
5.2.3 Auxiliary functions……………………………………………………………. 8
5.2.4 Communication status setting……………………………………………… 10
5.2.5 Mode selection of Rockwell or Rockwell Superficial…………………… 11
5.2.6 Buzzer for key…………………………………………………………………. 11
5.2.7 Browse through/print the track record……………………………………. 11
5.2.8 Time setting……………………………………………………………………. 11
5.3 Testing………………………………………………………………………….. 12
5.3.1 The preload loading………………………………………………………….. 12
5.3.2 Automatic testing……………………………………………………………... 13
5.3.3 Unloading………………………………………………………………………. 13
5.4 Shut down………………………………………………………………….…... 13
6 Maintenance and attentions………………………………………………… 14

5
1 General description
1.1 Scope of application
The Phase II multi-functional 900-385/900-386 hardness testers can be used directly to
measure Rockwell and superficial Rockwell hardness and change those values of Rockwell
hardness into HB, HV, HLD, HK and σb values.
Loaded with features such as ultra precise measurements, wide measuring range, automatic
main test force loading/unloading, digitally displayed results, automatic printing, RS232/USB
output, etc. the 900-385/6 is suitable for testing hardness on carbon steel, alloy steel, cast iron,
non ferrous metal and engineering plastics. A perfect performer suited for any environment
including heat treat facilities, tool rooms, workshops, laboratories and inspection labs.
1.2 Product features
 The indenter design is ideal for testing inside diameters and recesses, often impossible
with more traditional hardness testers. Inside diameters as small as 1-1/2-inches can be
tested with the standard indenter. Operators can test close to vertical surfaces, to within
1/4-inch with the standard indenter. Testing is fast, accurate and there are fewer broken
diamonds due to an outstanding viewing area.
 Wide measurement range: 30 hardness scales in total, HRA, HRB, HRC, HRD, HRE, HRF,
HRG, HRH, HRK, HRL, HRM, HRP, HRR, HRS, HRV, HR15N, HR30N, HR45N, HR15T, HR30T,
HR45T, HR15W, HR30W, HR45W, HR15X, HR30X, HR45X, HR15Y, HR30Y and HR45Y.
 Auxiliary functions: The 900-385 is capable of upper and lower limit settings; data
statistics, the computing for average value, standard deviation, maximum and minimum;
scale conversion (the testing results can be converted into the values of HB, HV, HLD, HK
and σb (strength); curved surface correction will automatically correct the measuring
results for cylindrical surface and spherical surface.
2 Key performance parameters
 Test resolution: 0.1HR Rockwell unit;
 Operation temperature: 50° - 95°F (10ᵒC～35ᵒC)
 Ambient environment: clean, no vibration, no strong magnetic field, and no corrosive
medium;
 Power supply: single phase, AC, 1100V（can be changed as 220V, the original power supply
is 110V）, 50～60Hz, 4A;
 Net weight: 120kg;
 Maximum dimension: 720mm×240mm×825mm.

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3 Basic configuration and structure
3.1 Standard configuration
Base machine
Standard hardness block for A scale
Standard hardness block for B scale
Standard hardness block for C scale
Standard hardness block for 15N scale
Standard hardness block for 30N scale
Standard hardness block for 30T scale
Carbide ball indenter (1/16″)
Rockwell C 120°cone diamond indenter
Mounting screws for indenter
Round plane anvil
“V ”shape anvil
Power supply wire
Screwdriver for indenter mounting
Dust cover
3.2 Structure schematic diagram
1- screen and keyboard 2- indenter base 3- indenter 4- anvil 5- leadscrew and
protecting sleeve 6- handwheel 7- leveling feet 8- switch and power panel 9- side door
10- handlever for load selection 11- canopy
Figure 3.1
Included Indentors:
Rockwell B Indentor
1/16” Carbide Ball Rockwell C Indentor
Diamond

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4 Installation and adjustment
4.1 Remove top cover of wood crate, then remove the three M10 screws from the underside
of the base. Lift the machine very carefully from the bottom. Do not lift from the head,
the side doors or other points any time. Remove all accessories and the weights that are
attached to the baseboard by the straps. SAVE CRATE FOR FUTURE TRANSPORTATION
NEEDS.
4.2 The machine should be mounted on a firm bench or table in a clean area, free from
vibration or shock, recommended height 800mm. The machine can be positioned with
its leadscrew overhanging the edge of the bench, otherwise a hole must be provided in
the top of the bench to provide working clearance for the leadscrew. See diagram 4.1.
4.3 Place the tester on a prepared platform, turn the hand wheel counter-clockwise to lower
the anvil, remove the anti vibration pad; then place a precise level on the anvil, adjust
the leveling feet of tester to make the level within 1mm/m, then lock the nuts. It is
recommended that the machine be secured to the top with three M10 bolts, screwed
into the undersurface of the machine housing. Refers to figure 4.1.
Figure 4.1
Optional Cabinet/Support Stand

8
4.4 Remove the screw on top of the machine that holds the canopy; Slightly lift the canopy
from front; remove the canopy after removing connecting cables out; remove all elastic
packaging belts from lever.
Method of extracting and plugging cable is as figure 4.2. For extracting cable, part the barbs
by exerting force on both sides, then the plug of cable will eject out. See figure 4.2.a; when
plugging cable is necessary, force the plug downward directly. See figure 4.2.b.
4.2.a 4.2.b
Figure 4.2
4.5 The tester has been provided with four weights in total with each being indentified with a
number 1thru 4 (equates to hanging position) Weight #1 is a single weight design while
2,3,&4 are dual weight designs. For installation, open the side door of tester and set out to
place weights in the following sequence: suspend weight No.1 at the corresponding
suspending groove on lower lever; then place weights of No.4, No.3 and No.2 at the
corresponding suspending grooves of upper lever. The suspending mode of No.1 and No.2
weight is shown in figure 4.3.a; the suspending mode of No.3 and No.4 weights is are
shown in figure 4.3.b. Make sure the blade on weight bar is correctly placed in the V
groove.
4.6 Correctly reconnect the cables pulled out in step 4.4; replace the canopy and tighten screw.
4.7 Connecting the power supply wire; select the power supply of 220V or 110V according to
the local power condition. The power supply status when leaving factory is 110V.
4.3.a 4.3.b
Figure 4.3

9
Use adjustable feet to level the machine. Be sure to lock nuts when completed
Sturdy Cabinet/Stand shown below:

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5 Operating methods
5.1 Testing preparation
Connect power supply and turn machine on. The 900-385 will perform a self check and relative
information such as type, serial number of the tester, software version will be displayed on screen.
Tester will come to main menu after self-checking; current (last used) test parameters will be
displayed on screen. Figure 5.1.1 is the typical display of Rockwell C testing parameter; showing the
current scale, indenter type, test force, load dwell, as well as current date and time.
Figure 5.1.1
When installing indenter, make sure the shank of the indentor is clean and free of oil, dust, etc.
Pay close attention to the display as it goes through self check since it will display the weight
load, indentor and scale that has been set previously. Make sure they concur with your
application.
The test can be immediately performed providing all parameters are set for your application.
See method 5.3
The following procedures should be observed if modification of parameters are necessary.
5.2 Test parameters setting
Press “Setup” key, figure 5.2.1 will be showed on screen, the parameter setting is ready.
5.2.1 Scale selection
Press“ ”or“ ”key to move cursor to “1” in figure 5.2.1, press “ ” key ,then the cursor move
to “HRC”. Press “ ”or“ ”key at this time the optional 15 Rockwell scales HRC、HRA、HRB、HRD、
HRE、HRF、HRG、HRH、HRK、HRL、HRM、HRP、HRR、HRS、HRV will be appear in sequence.
When the desired scale appears as figure 5.2.2, press “ ”to finish the selection.
Prompt will be shown automatically on the screen to allow for scale and indentor changes.

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Figure 5.2.1 Figure 5.2.2
The selection of test force is automatically adjusted once you select your hardness scale. There are
three test forces of 60kgf(588.4N), 100kgf(980.7N) and 150kgf(1471N) for Rockwell hardness
measurement, and also three test forces of 15kgf(147.1N), 30kgf(294.2N) and 45kgf(441.3N) for
Rockwell superficial hardness measurement. When selecting test force, the “R” identifications on
left are applicable for Rockwell hardness measuring mode, and the “RS” identifications on right are
applicable for Rockwell superficial hardness measuring mode.
Press “Setup” key to return to figure 5.1.1；or press “ ”or“ ”key to reset the other parameters.
5.2.2 Load Dwell Setting:
Load dwell refers to the duration of total test force (i.e. time of primary test force and main
test force). For hard metals without the possibility of flex, creep or elastic recovery of test
material dwell times should be set between 2-3 seconds. For materials that may exhibit slight
flex or creep should set the dwell between 6-8 seconds. For material with obvious distortion
with time after main test force has been loaded, the dwell time should be set between 20～25s.
Press “ ”or“ ”key to move cursor to “2” in figure 5.2.1, press “ ” key ,then the
cursor move to “5S”as figure 5.2.4. Press “ ”or“ ”key at this time to select the dwell time
range from 2s～50s,then press “ ”to finish the setting.
Press “Setup” key to return to figure 5.1.1；or press “ ”or“ ”key to reset the other
parameters.
Figure 5.2.4 Figure 5.2.5

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5.2.3Auxiliary functions
The tester has four auxiliary functions, which can be used individually, multi selected or all
selected. Press “”or“ ”key to move cursor to “3” in figure 5.2.1, press “ ” key ,then
the cursor move to the position of “ ”and change to “ ” as figure 5.2.5. Press “”
or“” key at this time to select the desired auxiliary functions, then press “ ”to conform
and into next menu as 5.2.6~5.2.10. There four auxiliary functions marked as
“ ”, which represent limit setting, data statistics, scale conversion and curved
surface correcting respectively.
5.2.3.1 Limit setting
Press “”or“ ” key to reset the value of upper limit and the value of lower limit in the
figure5.2.6, then press “ ” to confirm.
Figure 5.2.6
Figure 5.2.7
The upper limit and lower limit will be shown simultaneously with the display of measured
results each time after the function setting has taken effect. As figure 5.2.7, the testing result is
59.9HRC, upper limit is set as 62.0HRC, lower limit is 56.0HRC. If the result is beyond the set
limits, the machine will simultaneously show on display and produce a buzzer sound.
5.2.3.2 Data statistics
The statistics for one group of data is possible by pressing “”or“ ”key to determine the value of N (the
applicable scope is 2～99) in figure5.2.8; then press“ ” to confirm.
The values of serial number n and N will be shown simultaneously with the display of measured result each time
after the function setting has taken effect. Refer to figure 5.2.7, 5 measurements will be performed completely, and
the current measurement is the 2nd. In case of n=N, that is to say the last measurement had been completed, the
tester will automatically calculate the average
X
, standard deviation S, maximum (Max), minimum (Min) and the
range R as figure 5.2.9 showing after the hand wheel had been unloaded by turning counter-clockwise.
The mean value, standard deviation and range can be calculated according to the following equation.
X
=i
X
N
1，
S=2
)(
1
1−
−i
XX
N R=Max-Min
?

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Normally, the serial number will increase 1 after each measurement until the n is equal to N (i.e. all
of the N measurements were completed), then begin with statistical calculation. In event of an
erroneous result, press “”or“ ”key in the
figure 5.2.7 when the “√” change to “×”, then unload (i.e. Lowdown the anvil). For this
condition, n will not be added by 1, and the current measurement will not take part in the statistical
calculation.
Figure 5.2.8 Figure 5.2.9
5.2.3.3 Scale conversion
This function allows the user to convert the measured Rockwell hardness value to other scales or
even tensile strength. In the Rockwell measurement mode, the following functions can be attained:
changing the value of HRA scale into HBS, HBW, HV and HK value; changing the value of HRB scale
into HB10, HB30, HV, HLD, σb and HK value; changing the value of HRC scale into HBS, HBW, HV,
HLD, σb and HK value; changing the value of HRD scale into HV, HK, HB value; changing the value
of HRE scale into HV, HK, HB value; changing the value of HRF scale into HV, HB value. In the
Rockwell superficial measurement mode, following function can be realized: respectively changing
the value of HR15N, HR30N, HR 45N, HR15T, HR30T and HR45T scale into HV, HB, σb and HK value.
For instance, if we intend to convert the HRC value to HV value, press “ ”or“ ”key to move the
cursor to “3. HRC—HV” in figure 5.2.10, and then press “ ” to confirm.
Once this function has been set, the conversion value will be shown simultaneously with the test
results each time. As figure 5.2.7, the hardness value measured is 59.9HRC, conversion value is
696HV. Each change is performed within the applicable scope when a conversion is possible; “E”
will be shown on the display if the conversion is not possible.

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5.2.3.4 Curved surface correcting
The testing results should be corrected if the surface of sample measured is the external surface of
cylindrical or spherical part. Press “ ”or“ ” key to select cylindrical surface or spherical surface,
then press “ ” to confirm as figure 5.2.11.
After that, press “ ”or“ ”key to determine curvature radius or the diameter of sphere, and press
“” to confirm.
The measuring result as well as the correction value will be given in the course of each
measurement. Note: screen will display respectively testing value (the direct testing result without
correction) and correction value. As figure 5.2.7, the measuring result is 59.9HRC and the
correcting value is “+1.0” HRC.
5.2.3.5 Press “Setup” key to return to figure 5.1.1；or press “ ”or“ ”key to reset the other
parameters.
5.2.4 Communication status setting
The tester is provided with series digital communication port RS232 (transmission rate 9600bps),
which can be connected with printer or external computer. After setting, test results can be printed
in real time or sent to external computer.
Press “”or“ ”key to move cursor to “4” in figure 5.2.1, press “ ” key then the cursor move
to “Printer”. Press “”o r“ ”key at this time, the options “Printer”、“RS232”、“USB”、“Off”
will be appear in sequence. When the desired optional appears, as figure 5.2.12, press “ ”to
finish the selection.
Press “Setup” key to return to figure 5.1.1；or press “ ”or“ ”key to reset the other parameters.
Figure 5.2.12 Figure 5.2.13

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5.2.5 Mode selection of Rockwell or Rockwell Superficial
The tester was provided with two modes of Rockwell measuring and Rockwell superficial
measuring. Press “ ”or“ ”key to move cursor to “5” in figure 5.2.1, then press “ ” key, the
cursor move to “Rockwell”. Press “ ”or“ ”key to select the measuring mode as figure 5.2.13,
and press “ ” key to confirm. The tester will changeover automatically.
Press “Setup” key to return to figure 5.1.1；or press “ ”or“ ”key to reset the other parameters.
5.2.6 Buzzer for key
Press “ ”or“ ”key to move cursor to “6” in figure 5.2.1, press “ ” key, then the cursor move
to “On”. Press “ ”or“ ”key to select the “On” or “Off” for the key buzzer, press “ ” key to
confirm.
Press “Setup” key to return to figure 5.1.1；or press “ ”or“ ”key to reset the other parameters.
5.2.7 Browse through/printing memory
Press “ ”or“ ” key to move cursor to “7” in figure 5.2.1, then press “ ” key. The latest 8 test
results will display on the screen as figure 5.2.14. The serial number and time of the test are
displayed simultaneously. The 900-385 has a maximum memory for 500 test results. Press
“”or“ ” key to scroll the items. The item of record which the cursor pointed can be printed by
press “ ” key.
Press “Setup” key to return to figure 5.1.1；or press “ ”or“ ”key to reset the other parameters.
5.2.8 Time setting
Press “”or“ ” key to move cursor to “8” in figure 5.2.1, press “ ” key, figure5.2.15
appears. Press “”or“ ”key to move cursor to “1” in figure 5.2.15, then press “ ” key,
press “”or“ ”to select the year, and press “ ”key to confirm.
The month , also the date, hour, minute and second can be reset in the same way.
Press “Setup” key to return to figure 5.1.1；or press “ ”or“ ”key to reset the other parameters.
Figure 5.2.14 Figure 5.2.15

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5.3 Testing
5.3.1 The preload loading
Place the sample to be tested on the anvil, and rotate the hand wheel clockwise to lift the anvil as figure 5.3.1, showing the anvil
moving course. Rotate the hand wheel smoothly until the anvil in figure reaches the end position as figure 5.3.2. Immediately stop
rotating once buzzer sounds. This indicates that the automatic brake has locked the machine so it can begin performing the test.
Figure5.3.1 Figure5.3.2
5.3.2 Automatic testing
After the completion of loading primary test force, test will be performed automatically as follows: loading main test force, as
figure 5.3.3; holding with dwell time counting down after loading, refer to figure 5.3.4. Finally, unloading is performed
immediately when the dwell time has finished. Test results will be showed on screen, refer to figure 5.2.7.
5.3.3 Unloading
Rotate the hand wheel counter-clockwise to lower the anvil, and the test force will be unloaded completely; the
screen returns to figure 5.1.1, and all test parameters are stored for the next testing.
Figure 5.3.3
Figure 5.3.4

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5.4 Shut down
Remove the test force completely, and switch off the power supply. Remove power cord if machine
is to be idle for an extended period of time
6 Maintenance and attentions
6.1 When transporting the hardness tester, the weights and the indenter must be removed, and a
shockproof rubber pad must be put between the indenter “nose” and the anvil. If it is to be
transported for a long distance, the original packaging should be used.
6.2 When performing any adjustments and examinations such as loading/unloading weight,
removing canopy, plugging/ extracting cables or opening the side door for inspection, the power
supply should be cut off.
6.3 The changing of test force while the indenter is contacting sample for measurement.
6.4 When changing the indenter, pay close attention to ensure the tip avoids damage and
contamination, and the mounting surface should be clean without any oil, dust, dirt, etc The
indenter should be removed and stored carefully in the carry case if idle for a long term; In that
case, rust protection measures are necessary.
6.5 The surface of anvil and standard hardness block should be clean without any scratches, scoring
and bruising; When stored for an extended period of time, these should be lightly oiled to prevent
rust.
6.6 Tested specimen must be placed flat on the anvil and supported properly to prevent any
displacement or distortion during the test.
6.7 Dustproof and corrosive medium prevention should be considered in its daily operating
environment. Regular rust prevention measures should be adopted in humid areas.
6.8 The leadscrew of the anvil should be lubricated periodically. Remove the anvil and lower
leadscrew cover. Lower leadscrew to lowest point. Apply a few drops of light machine oil, then run
the leadscrew up and down a few times to distribute the oil. Finally, refit the leadscrew dustcover.
6.9 The regular verification and calibration of hardness tester should be performed according to the
relevant standards.
6.10 Please don’t disassemble or adjust any fixed parts as this will cause the warranty to be void.

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Approximate Hardness Conversion Numbers for Non-Austenitic Steels
(Rockwell C Hardness Range)A
Brinell Hardness Number C Rockwell Superficial Rockwell Number
Rockwell C
150kgf
(HRC)
Vickers
(HV)
10-mm
Standard
ball
3000kgf
(HBS)
10-mm
Carbide
ball
3000kgf
(HBW)
Knoop
500-gf
and
Over
(HK)
A
Scale
60 kgf
(HRA)
D Scale
100kgf
(HRD)
15-N
Scale
15-kgf
(HR15N)
30-N
Scale
30-kgf
(HR30N)
45-N
Scale
45-kgf
(HR45N)
Scleroscope
HardnessD
68
67
66
65
64
63
62
61
60
59
58
57
56
55
54
53
52
51
50
49
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
940
900
865
832
800
772
746
720
697
674
653
633
613
595
577
560
544
528
513
498
484
471
458
446
434
423
412
402
392
382
372
363
354
345
336
327
318
310
302
294
286
279
272
…
…
…
…
…
…
…
…
…
…
…
…
…
…
…
…
(500)
(487)
(475)
(464)
451
442
432
421
409
400
390
381
371
362
353
344
336
327
319
311
301
294
286
279
271
264
258
…
…
…
(739)
(722)
(705)
(688)
(670)
(654)
634
615
595
577
560
543
525
512
496
481
469
455
443
432
421
409
400
390
381
371
362
353
344
336
327
319
311
301
294
286
279
271
264
258
920
895
870
846
822
799
776
754
732
710
690
670
650
630
612
594
576
558
542
526
510
495
480
466
452
438
426
414
402
391
380
370
360
351
342
334
326
318
311
304
297
290
284
85.6
85.0
84.5
83.9
83.4
82.8
82.3
81.8
81.2
80.7
80.1
79.6
79.0
78.5
78.0
77.4
76.8
76.3
75.9
75.2
74.7
74.1
73.6
73.1
72.5
72.0
71.5
70.9
70.4
69.9
69.4
68.9
68.4
67.9
67.4
66.8
66.3
65.8
65.3
64.8
64.3
63.8
63.3
76.9
76.1
75.4
74.5
73.8
73.0
72.2
71.5
70.7
69.9
69.2
68.5
67.7
66.9
66.1
65.4
64.6
63.8
63.1
62.1
61.4
60.8
60.0
59.2
58.5
57.7
56.9
56.2
55.4
54.6
53.8
53.1
52.3
51.5
50.8
50.0
49.2
48.4
47.7
47.0
46.1
45.2
44.6
93.2
92.9
92.5
92.2
91.8
91.4
91.1
90.7
90.2
89.8
89.3
88.9
88.3
87.9
87.4
86.9
86.4
85.9
85.5
85.0
84.5
83.9
83.5
83.0
82.5
82.0
81.5
80.9
80.4
79.9
79.4
78.8
78.3
77.7
77.2
76.6
76.1
75.6
75.0
74.5
73.9
73.3
72.8
84.4
83.6
82.8
81.9
81.1
80.1
79.3
78.4
77.5
76.6
75.7
74.8
73.9
73.0
72.0
71.2
70.2
69.4
68.5
67.6
66.7
65.8
64.8
64.0
63.1
62.2
61.3
60.4
59.5
58.6
57.7
56.8
55.9
55.0
54.2
53.3
52.1
51.3
50.4
49.5
48.6
47.7
46.8
75.4
74.2
73.3
72.0
71.0
69.9
68.8
67.7
66.6
65.5
64.3
63.2
62.0
60.9
59.8
58.6
57.4
56.1
55.0
53.8
52.5
51.4
50.3
49.0
47.8
46.7
45.5
44.3
43.1
41.9
40.8
39.6
38.4
37.2
36.1
34.9
33.7
32.5
31.3
30.1
28.9
27.8
26.7
97.3
95.0
92.7
90.6
88.5
86.5
84.5
82.6
80.8
79.0
77.3
75.6
74.0
72.4
70.9
69.4
67.9
66.5
65.1
63.7
62.4
61.1
59.8
58.5
57.3
56.1
54.9
53.7
52.6
51.5
50.4
49.3
48.2
47.1
46.1
45.1
44.1
43.1
42.2
41.3
40.4
39.5
38.7

19
Approximate Hardness Conversion Numbers for Non-Austenitic Steels
(Rockwell B Hardness Range)A
Rockwell Superficial Rockwell Number
Rockwell B
100kgf
(HRB)
Vickers
(HV)
10-mm
Standard
ball
3000kgf
(HBS)
Knoop
500-gf
and
Over
(HK)
A
Scale
60 kgf
(HRA)
F Scale
60kgf
(HRF)
15-T Scale
15-kgf
(HR15T)
30-T Scale
30-kgf
(HR30T)
45-T Scale
45-kgf
(HR45T)
100
99
98
97
96
95
94
93
92
91
90
89
88
87
86
85
84
83
82
81
80
79
78
77
76
75
74
73
72
71
70
69
68
67
66
65
64
63
240
234
228
222
216
210
205
200
195
190
185
180
176
172
169
165
162
159
156
153
150
147
144
141
139
137
135
132
130
127
125
123
121
119
117
116
114
112
240
234
228
222
216
210
205
200
195
190
185
180
176
172
169
165
162
159
156
153
150
147
144
141
139
137
135
132
130
127
125
123
121
119
117
116
114
112
251
246
241
236
231
226
221
216
211
206
201
196
192
188
184
180
176
173
170
167
164
161
158
155
152
150
147
145
143
141
139
137
135
131
129
127
125
124
61.5
60.9
60.2
59.5
58.9
58.3
57.6
57.0
56.4
55.8
55.2
54.6
54.0
53.4
52.8
52.3
51.7
51.1
50.6
50.0
49.5
48.9
48.4
47.9
47.3
46.8
46.3
45.8
45.3
44.8
44.3
43.8
43.3
42.8
42.3
41.8
40.9
40.4
…
…
…
…
…
…
…
…
…
…
…
…
…
…
…
…
…
…
…
…
…
…
…
…
…
99.6
99.1
98.5
98.0
97.4
96.8
96.2
95.6
95.1
94.5
93.9
93.4
92.8
93.1
92.8
92.5
92.1
91.8
91.5
91.2
90.8
90.5
90.2
89.9
89.5
89.2
88.9
88.6
88.2
87.9
87.6
87.3
86.9
86.6
86.3
86.0
85.6
85.3
85.0
84.7
84.3
84.0
83.7
83.4
83.0
82.7
82.4
82.1
81.8
81.4
81.1
83.1
82.5
81.8
81.1
80.4
79.8
79.1
78.4
77.8
77.1
76.4
75.8
75.1
74.4
73.8
73.1
72.4
71.8
71.1
70.4
69.7
69.1
68.4
67.7
67.1
66.4
65.7
65.1
64.4
63.7
63.1
62.4
61.7
61.0
60.4
59.7
59.0
58.4
72.9
71.9
70.9
69.9
68.9
67.9
66.9
65.9
64.8
63.8
62.8
61.8
60.8
59.8
58.8
57.8
56.8
55.8
54.8
53.8
52.8
51.8
50.8
49.8
48.8
47.8
46.8
45.8
44.8
43.8
42.8
41.8
40.8
39.8
38.7
37.7
36.7
35.7

20
Approximate Leeb (Type D) Hardness Conversion for Non-Austenitic Steels (Rockwell C Hardness Range)A
Leeb Hardness, Type D
Impact Device (HLD)
Rockwell C Hardness
150kgf (HRC)
Vickers Hardness
(HV 10)
Brinell Hardness
10mm Steel Ball
3000kgf (HBS)
828
819
809
800
791
782
773
764
755
746
737
729
720
712
703
695
687
679
671
663
655
647
640
632
625
618
611
603
596
590
583
576
570
563
557
551
545
539
533
527
521
516
510
62
61
60
59
58
57
56
55
54
53
52
51
50
49
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
20
762
737
711
688
667
645
625
605
586
568
550
534
517
503
487
473
460
447
434
422
410
398
388
377
368
358
349
339
330
323
314
306
299
291
284
277
271
264
258
251
245
240
234
(721)
(699)
(675)
(654)
634
614
595
577
559
542
526
511
496
482
467
455
442
430
418
407
395
385
375
365
356
347
338
328
320
313
305
297
291
283
276
270
264
258
252
246
240
235
229

21
Weight - Load - Indentor Chart
Scale
Symbol
Indentor Type Preliminary
Force
N (k
g
f)
Total
Force
N (k
g
f)
Typical Applications
A Spheroconical
Diamond
98.07 (10) 588.4 (60) Cemented carbides, thin steel, and
shallow case hardened steel
B 1/16” Carbide Ball 98.07 (10) 980.7 (100) Copper alloys, soft steels, aluminum
alloys, malleable iron, etc.
C Spheroconical
Diamond
98.07 (10) 1471 (150) Steel, hard cast irons, pearlitic
malleable iron, titanium, deep case
hardened steel, other harder than
HRB 100
D Spheroconical
Diamond
98.07 (10) 980.7 (100) Thin steel and medium case
hardened steel, and pearlitic
malleable iron
E 1/8” Carbide Ball 98.07 (10) 980.7 (100) Cast Iron, Aluminum and
magnesium alloys, and bearing
metals
F 1/16” Carbide Ball 98.07 (10) 588.4 (60)
A
nnealed copper alloys and thin soft
sheet metals
G 1/16” Carbide Ball 98.07 (10) 1471 (150) Malleable irons, copper-nickel-zinc
and cupro-nickel alloys
H 1/8” Carbide Ball 98.07 (10) 588.4 (60) Aluminum, zinc and lead
K 1/8” Carbide Ball 98.07 (10) 1471 (150)
L ¼” Carbide Ball 98.07 (10) 588.4 (60)
M ¼” Carbide Ball 98.07 (10) 980.7 (100)
P ¼” Carbide Ball 98.07 (10) 1471 (150)
R ½” Carbide Ball 98.07 (10) 588.4 (60)
S ½” Carbide ball 98.07 (10) 980.7 (100)
V ½” Carbide ball 98.07 (10) 1471 (150)
15N Spheroconical
Diamond
29.42 (3) 147.1 (15)
30N Spheroconical
Diamond
29.42 (3) 294.2 (30)
45N Spheroconical
Diamond
29.42 (3) 441.3 (45)
15T 1/16” Carbide Ball 29.42 (3) 147.1 (15)
30T 1/16” Carbide Ball 29.42 (3) 294.2 (30)
45T 1/16” Carbide Ball 29.42 (3) 441.3 (45)
15W 1/8” Carbide Ball 29.42 (3) 147.1 (15)
30W 1/8” Carbide Ball 29.42 (3) 294.2 (30)
45W 1/8” Carbide Ball 29.42 (3) 441.3 (45)
15X ¼” Carbide Ball 29.42 (3) 147.1 (15)
30X ¼” Carbide Ball 29.42 (3) 294.2 (30)
45X ¼” Carbide Ball 29.42 (3) 441.3 (45)
15
Y
½” Carbide Ball 29.42 (3) 147.1 (15)
30
Y
½” Carbide Ball 29.42 (3) 294.2 (30)
45
Y
½” Carbide Ball 29.42 (3) 441.3 (45)
Bearing Metals and other very
soft or thin materials. Use
smallest ball and heaviest load
that doesn’t give anvil effect.
Similar to A, C and D scales but
for thinner gage material.
Similar to B, F and G scales but
for thinner
g
a
g
e material.
Very Soft Material

22
Round Correction Factors
Corrections to be added to test results in the following scales for various diameter parts.
Corrections to be added to Rockwell C, A and D values
Diameter of Convex Cylindrical Surfaces
Hardness
Reading
¼”
6.4mm
3/8”
10mm
½”
13mm
5/8”
16mm
¾”
19mm
7/8”
22mm
1”
25mm
1-1/4”
32mm
1-1/2”
38mm
Corrections to be added to Rockwell B, F and G values
Diameter of Convex Cylindrical Surfaces
Hardness
Reading
¼”
6.4mm
3/8”
10mm
½”
13mm
5/8”
16mm
¾”
19mm
7/8”
22mm
1”
25mm
20
25
30
35
40
45
50
55
60
65
70
75
80
85
90
6.0
5.5
5.0
4.0
3.5
3.0
2.5
2.0
1.5
1.5
1.0
1.0
0.5
0.5
0.5
4.5
4.0
3.5
3.0
2.5
2.0
2.0
1.5
1.0
1.0
1.0
0.5
0.5
0.5
0
3.5
3.0
2.5
2.0
2.0
1.5
1.5
1.0
1.0
1.0
0.5
0.5
0.5
0.5
0
2.5
2.5
2.0
1.5
1.5
1.0
1.0
1.0
0.5
0.5
0.5
0.5
0.5
0
0
2.0
2.0
1.5
1.5
1.0
1.0
1.0
0.5
0.5
0.5
0.5
0.5
0.5
0
0
1.5
1.5
1.5
1.0
1.0
1.0
0.5
0.5
0.5
0.5
0.5
0.5
0
0
0
1.5
1.0
1.0
1.0
1.0
0.5
0.5
0.5
0.5
0.5
0.5
0
0
0
0
1.0
1.0
1.0
0.5
0.5
0.5
0.5
0.5
0
0
0
0
0
0
0
1.0
1.0
0.5
0.5
0.5
0.5
0.5
0
0
0
0
0
0
0
0
0
10
20
30
40
50
60
70
80
90
100
12.5
12.0
11.0
10.0
9.0
8.0
7.0
6.0
5.0
4.0
3.5
8.5
8.0
7.5
6.5
6.0
5.5
5.0
4.0
3.5
3.0
2.5
6.5
6.0
5.5
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
5.5
5.0
4.5
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.5
4.5
4.0
4.0
3.5
3.0
3.0
2.5
2.0
1.5
1.5
1.0
3.5
3.5
3.5
3.0
2.5
2.5
2.0
2.0
1.5
1.5
1.0
3.0
3.0
3.0
2.5
2.5
2.0
2.0
1.5
1.5
1.0
0.5