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Technical Information

CHEMICAL RANGE

GRADE C Mn Si S P Cr Ni Mo V
EN-8 0.35 – 0.45 0.60 – 1.00 0.10 – 0.35 0.050 MAX 0.050 MAX
EN-8D 0.40 – 0.45 0.70 – 0.90 0.05 – 0.35 0.060 MAX 0.060 MAX
EN-9 0.50 – 0.60 0.50 – 0.80 0.05 – 0.35 0.040 MAX 0.040 MAX
EN-19 0.35 – 0.45 0.50 – 0.80 0.10 – 0.35 0.04 0.04 0.9-1.4 0.2-0.4
SAE – 4140 0.38 – 0.43 0.75 – 1.00 0.20 – 0.35 0.035 0.035 0.8-1.1 0.15-0.25
42CRMO4 0.35 – 0.45 0.50 – 0.80 0.15 – 0.40 0.035 0.035 0.9-1.2 0.15-0.3
SCM – 435 0.33 – 0.38 0.60 – 0.85 0.15 – 0.35 0.030 MAX 0.030 MAX 0.9-1.2 0.15-0.3
EN-15 0.30 – 0.40 1.30 – 1.70 0.10 – 0.35 0.040 MAX 0.040 MAX
SAE 1541 0.36 – 0.44 1.35 – 1.65 0.050 MAX 0.040 MAX
EN-16 0.30 – 0.40 1.30 – 1.80 0.10 – 0.35 0.04 0.04 0.2-0.3
EN-18 0.35 – 0.45 0.60 – 0.95 0.10 – 0.35 0.04 0.04 0.85-1.15
41CR4 0.38 – 0.45 0.50 – 0.80 0.15 – 0.40 0.035 MAX 0.035 MAX 0.9-1.2
EN-25 0.27 – 0.35 0.50 – 0.70 0.10 – 0.35 0.04 0.04 0.50 – 0.8 2.3-2.8 0.4-0.7
EN-31 0.90 – 1.20 0.30 – 0.75 0.10 – 0.35 0.04 0.04 1-1.6
SAE 52100 0.98 – 1.10 0.25 – 0.45 0.15 – 0.30 0.025 MAX 0.025 MAX 1.3-1.6
EN-36B 0.12 – 0.18 0.30 – 0.60 0.10 – 0.35 0.04 0.04 0.6-1.1 3-3.75
EN-36C 0.12 – 0.18 0.30 – 0.60 0.1-0.35 0.04 0.04 0.6-1.1 3-3.75 0.1-0.25
EN-41B 0.35 – 0.45 0.60 MAX 0.1-0.45 0.04 0.04 1.5-1.8 0.40 MAX 0.1-0.25
EN-47 0.45 – 0.55 0.50 – 0.80 0.50 MAX 0.04 0.04 0.8-1.2
EN-353 0.20 MAX 0.50 – 1.00 0.35 MAX 0.04 0.04 0.75-1.25 1-1.5 0.08-0.15
EN-354 0.20 MAX 0.50 – 1.00 0.35 MAX 0.04 0.04 0.75-1.25 1.50 – 2.0 0.1-0.2
16MNCR5 0.14 – 0.19 1.00 – 1.30 0.15 – 0.40 0.035 MAX 0.035 MAX 0.8-1.1
20MNCR5 0.17 – 0.22 1.10 – 1.40 0.10 – 0.35 0.035 0.035 1-1.3
SAE – 4150 0.48 – 0.53 0.75 – 1.00 0.20 – 0.35 0.04 0.04 0.8-1.1 0.15-0.25
SAE – 4320 0.17 – 0.22 0.45 – 0.65 0.15 – 0.35 0.035 MAX 0.040 MAX 0.4-0.6 1.65-2 0.20 – 0.30
EN-24 0.35 – 0.45 0.45 – 0.70 0.10 – 0.35 0.04 0.04 0.9-1.4 1.3-1.8 0.20 – 0.40
SAE – 4340 0.38 – 0.43 0.60 – 0.80 0.15 – 0.35 0.035 MAX 0.040 MAX 0.7-0.9 1.65-2 0.20 – 0.30
SAE – 8620 0.18 – 0.23 0.70 – 0.90 0.20 – 0.35 0.04 0.04 0.4-0.6 0.4-0.7 0.15-0.25
F – 22 0.15 MAX 0.30 – 0.60 0.40 MAX 0.04 0.04 2-2.5 0.87-1.3
17CRNIMO6 0.14 – 0.19 0.40 – 0.60 0.15 – 0.40 0.035 MAX 0.035 MAX 1.5-1.8 1.4-1.7 0.25-0.35
A – 105 0.35 MAX 0.60 – 1.05 0.35 MAX 0.050 MAX 0.040 MAX
CK – 45 0.42 – 0.50 0.50 – 0.80 0.15 – 0.35 0.035 MAX 0.035 MAX
SCM – 420 0.18 – 0.23 0.60 – 0.85 0.15 – 0.35 0.030 MAX 0.030 MAX 0.9-1.2 0.15-0.3
45C8 0.40 – 0.50 0.60 – 0.90 0.10 – 0.35
4130 0.28 – 0.33 0.40 – 0.60 0.15 – 0.30 0.035 MAX 0.040 MAX 0.80 – 1.1 0.15-0.25
B – 16 0.36 – 0.47 0.45 – 0.70 0.15 – 0.35 0.040 MAX 0.035 MAX 0.8-1.15 0.5-0.65 0.25-0.35
103T3 0.95 – 1.1 0.4 0.1-0.3 0.035 0.035
45C8 0.42-0.5 0.5-0.8 0.1-0.4 0.035 0.035
40NI6CR4MO2 0.38-0.45 0.4-0.7 0.1-0.35 0.035 0.035 0.9-1.3 0.1-0.2
17MNCR 0.14-.019 1-1.3 0.1-0.35 0.05 0.05 0.8-1.1
20MNCR 0.17-0.22 1-1.4 0.1-0.35 0.05 0.05 1-1.3
40CR1MO28 0.35-0.45 0.5-0.8 0.1-0.35 0.05 0.05 0.9-1.2 0.2-0.35
16MN5CR4 0.14-0.19 1-1.3 0.15-0.35 0.035 0.035 0.8-1.1
20MN5CR5 0.17-0.22 1-1.4 0.15-0.35 0.035 0.035 1-1.3
20CR 13 0.16-0.25 1 1 0.035 0.04 12-14
NICKEL200 0.15 0.35 0.35 0.01 99.0MIN
NICKEL201 0.02 0.35 0.35 0.01 99.0MIN
201 0.15 5.5-7.5 1 0.03 0.06 16-18 3.5-5.5
202 0.15 7.5-10 1 0.03 0.06 17-19 4-6
301 0.15 2 1 0.03 0.045 16-18 6-8
302 0.15 2 1 0.03 0.045 17-19 8-10
A335-P22 0.05-0.15 0.3-0.6 0.5 0.025 0.025 1.9-2.6 0.87-1.13
A335-P 23 0.04-0.01 0.1-0.6 0.5 0.01 0.03 1.9-2.6 0.05-0.03
A335-P 91 0.08-0.13 0.3-0.6 0.2-0.5 0.01 0.02 8-9.5 0.85-1.05
A439D2 3 MAX 0.70- 1.25 1.5-3 0.08 1.75-2.75 18-22
S1 0.4-0.55 0.1 -0.4 0.15-1.2 0.03 0.03 1-1.8 0.50
L6 0.65-0.7 0.25-0.8 0.1-0.5 0.03 0.03 0.6-1.2 1.25-2 0.50
D2 1.4-1.5 0.2-0.6 0.1- 0.6 0.03 0.03 11-13 0.7-1.2
D3 2-2.35 0.2-0.6 0.1-0.6 0.03 0.03 11-13.5
310 MO 0.08 2.0 1.0 0.03 0.045 24-26 19.22
314 0.08 2 1.5-2 0.03 0.04 23-26 19-22
316 0.08 2.0 1.0 0.03 0.045 16-18 10-14
316H 0.04 -0.1 2.0 1.0 0.03 0.045 16-18 10-14
316TI 0.08 2.0 1.0 0.03 0.045 16-18 10-14
316L 0.03 2.0 1.0 0.03 0.045 16-18 10-14
317 0.08 2.0 1.0 0.03 0.045 18-20 11-15
317L 0.03 2.0 1.0 0.03 0.045 18-20 11-15
321 0.08 2.0 1.0 0.03 0.045 17-19 9-12
321H 0.04-0.1 2.0 1.0 0.03 0.045 17-19 9-12
H41 0.6-0.75 0.15-0.4 0.15-0.4 0.03 0.03 3.5-4 8.2-9.2
H42 0.55-0.70 0.15-0.4 0.15-0.4 0.03 0.03 3.75-4.5 4.5-5.5
H11 0.33-0.43 0.2-0.5 0.2-0.5 0.03 0.03 4.75-5.5 1.1-1.6
H12 0.30 -0.40 0.20-0.50 0.20-0.50 0.03 0.03 4.75-5.50 1.25-1.75
H13 0.32-0.45 0.2-0.5 0.2-0.5 0.03 0.03 4.75-5.5 1.1-1.7

Grades and Materials

GRADES & MATERIALS
MATERIAL No. GERMANY UK FRANCE USA RUSSIA
DIN B.S AFNOR ASTM/SAE GOST
1.5223 42MnV7 Grade 1340
1.6510 39CrNiMo3 816M40 40NCD3 9840 40ChN2MA
1.6511 36CrNiMo4 817M37 35NCD5 4340
9840
1.6562 40NiCrMo8-4 817M40 4340
1.6565 40NiCrMo6 4340
1.6580 30CrNiMo8 823M30 30NCD8
1.6582 34CrNiMo6 817M40, 816M40 34CrNiMo8, 35NCD6 4337, 4340 38Ch2N2MA
1.6773 36NiCrMo16 835M30 35NCD16
1.7035 41Cr4 530M40 42C4 5140 40Ch
1.7218 25CrMo4 708A25 25CD4 4130 22ChM
1.7220 34CrMo4 708A37 35CD4 4135, 4137 35ChM
1.7225 42CrMo4 708M40, 709M40 42CD4 4140H 40ChML
1.7228 50CrMo4 708A47 50CrMo4 4150 50Ch
1.7701 52CrMoV4 51CDV4
1.7707 30CrMoV9
1.7709 21CrMoV5-7 21CrMoV5-7
1.7711 40CrMoV4-6 40CrMoV4-6 B16
1.8159 51CrV4 735A51 51CV4 6150 50ChGF
TOOL STEELS
MATERIAL No. GERMANY UK FRANCE USA RUSSIA
DIN B.S AFNOR ASTM/SAE GOST
1.2510 100MnCrW4 BO 1 90MnWCrV5 O1  –
1.2842 90MNCrV8, 1.2842 BO 2 90MV8 O2  –
 –  –  –  – S2  –
1.2330 35CrMo4 BP 20  – P20  –
P21
H13
CASE HARDENING STEELS
MATERIAL No. GERMANY UK FRANCE USA RUSSIA
DIN B.S AFNOR ASTM/SAE GOST
1.5752 15NiCr13 AISI E3310, ASTM A837
1.5860 14NiCr18
1.5919 15CrNi6 4320, 4320H
1.5920 18CrNi8
1.6523 20NiCrMo2-2 805M20, 806M20 20NCD2, 22NCD2 8620 20ChGNM
1.6543 21NiCrMo2-2 805A20 8622
1.6569 17NiCrMoS6-4 815M70 18NCD2
1.6587 17CrNiMo6 820A16 18CND6 4820
1.7131 16MnCr5 527M17, 590M17 16MC4, 16MC5 5115 18ChG
1.7147 20MnCr5 20MC5 5120 20Ch
1.7243 18CrMo4 708M20 18CD4
1.7325 25MoCr4
CREEP RESISTANT STEELS
MATERIAL No. GERMANY UK B.S FRANCE USA RUSSIA
DIN AFNOR ASTM/SAE GOST
1.5415 16Mo3 F1
1.7335 13CrMo4-4 13CrMo4-5 F11
1.7337 16CrMo4-4 F12
1.7380 10CrMo9-10 F22 10Ch2M
1.7390 X15CrMo5-1 X15CrMo5-1 F5
1.7386 X11CrMo9-1 F9
F6
ANTI-FRICTION BEARING STEELS
MATERIAL No. GERMANY UK FRANCE USA RUSSIA
DIN B.S AFNOR ASTM/SAE GOST
1.3505 100Cr6 2S135, 535A99 100C6 52100 9Ch1
1.3536 100CrMo7-3
STAINLESS STEELS
W. No. Steel Designation UK B.S France AFNOR USA ASTM / SAE Russia GOST
1.4024 X5Cr13 403S17 Z12C13 403
1.4512 X6CrTi12 409S19 Z8CNT12 409
1.4006 X12Cr13 410S21 Z10C13 410
1.4005 X12CrS13 416S21 Z20C13 416
1.4021 X20Cr13 420S97 Z20C13 420
1.4016 X6Cr17 430S15 Z 8 C 17 430
1.4104 X14CrMoS17 Z8CF17 430F
1.4105 X6CrMoS17 430F
1.4057 X17CrNi16-2 431S29 Z15CN 16, 02 431
1.4034 X46Cr13
1.4028 X30Cr13 420S45 Z30Cr13 / Z33C13 420
414
1.4031 X39Cr13  420545  Z40C13  Type 420
1.4122 X39CrMo17-1
1.4306 X2CrNi19-11 304 S11 304 L
1.4305 X8CrNiS18-9 303 S31 303
1.4404 X2CrNiMo17-12-2 316 S11 316L
1.4923 X22CrMoV12-1

Bar Weights

Diameter (inch) Lbs Per Inch Lbs Per Foot Lbs Per 12 Ft. Bar
1/16 0.001 0.010 0.120
5/64 0.001 0.016 0.190
3/32 0.002 0.023 0.280
7/64 0.003 0.032 0.380
1/8 0.004 0.042 0.500
9/64 0.004 0.053 0.640
5/32 0.005 0.065 0.780
11/64 0.007 0.079 0.950
3/16 0.008 0.094 1.130
13/64 0.009 0.110 1.320
7/32 0.011 0.128 1.540
15/64 0.012 0.147 1.760
1/4 0.014 0.167 2.000
17/64 0.016 0.188 2.256
9/32 0.018 0.211 2.530
19/64 0.019 0.235 2.820
5/16 0.022 0.261 3.130
21/64 0.024 0.287 3.440
11/32 0.026 0.316 3.790
23/64 0.029 0.345 4.140
3/8 0.031 0.376 4.510
25/64 0.034 0.407 4.880
13/32 0.037 0.441 5.290
27/64 0.039 0.475 5.700
7/16 0.043 0.511 6.130
29/64 0.046 0.548 6.576
15/32 0.049 0.587 7.040
31/64 0.052 0.626 7.510
1/2 0.056 0.668 8.020
33/64 0.059 0.710 8.520
17/32 0.063 0.754 9.050
9/16 0.070 0.845 10.140
37/64 0.074 0.892 10.700
19/32 0.078 0.941 11.290
5/8 0.087 1.043 12.520
41/64 0.092 1.096 13.150
21/32 0.096 1.150 13.800
11/16 0.105 1.262 15.140
23/32 0.115 1.379 16.550
3/4 0.125 1.502 18.020
49/64 0.131 1.565 18.780
25/32 0.136 1.630 19.560
13/16 0.147 1.763 21.160
27/32 0.158 1.901 22.810
7/8 0.170 2.044 24.530
57/64 0.177 2.118 25.420
29/32 0.183 2.193 26.320
15/16 0.196 2.347 28.160
31/32 0.209 2.506 30.070
1 0.220 2.670 32.040
1/64 0.230 2.750 33.000
1/16 0.250 3.014 36.170
3/32 0.270 3.194 38.330
1/8 0.280 3.379 40.550
9/64 0.290 3.470 41.640
5/32 0.300 3.570 42.840
3/16 0.310 3.766 45.190
1/4 0.350 4.173 50.080
17/64 0.360 4.276 51.310
9/32 0.370 4.384 52.600
5/16 0.380 4.600 55.200
3/8 0.420 5.049 60.590
13/32 0.440 5.279 63.350
7/16 0.460 5.518 66.220
1/2 0.500 6.008 72.100
17/32 0.520 6.261 75.130
9/16 0.540 6.520 78.240
5/8 0.590 7.051 84.610
11/16 0.640 7.604 91.250
3/4 0.680 8.178 98.140
13/16 0.730 8.773 105.300
7/8 0.780 9.388 112.700
15/16 0.840 10.020 120.200
2 0.890 10.680 128.200
1/16 0.950 11.360 136.300
1/8 1.010 12.060 144.700
3/16 1.070 12.780 153.400
1/4 1.130 13.520 162.200
5/16 1.190 14.280 171.400
3/8 1.260 15.060 180.700
7/16 1.330 15.870 190.400
1/2 1.390 16.690 200.300
9/16 1.460 17.530 210.400
5/8 1.540 18.400 220.800
11/16 1.610 19.290 231.500
3/4 1.690 20.200 242.400
13/16 1.760 21.120 253.400
7/8 1.840 22.070 264.800
15/16 1.920 23.040 276.500
3 2.010 24.030 288.400
1/16 2.090 25.050 300.600
1/8 2.180 26.080 312.900
3/16 2.270 27.130 325.600
1/4 2.360 28.210 338.500
5/16 2.450 29.300 351.600
3/8 2.540 30.420 365.000
7/16 2.640 31.550 378.600
1/2 2.730 32.710 392.500
5/8 2.930 35.090 421.100
11/16 3.030 36.310 435.700
3/4 3.140 37.550 450.600
7/8 3.350 40.100 481.200
15/16 3.450 41.400 496.800
4 3.560 42.730 512.600
1/8 3.790 45.430 545.200
1/4 4.020 48.230 578.700
3/8 4.260 51.110 613.300
7/16 4.390 52.580 630.900
1/2 4.510 54.070 648.900
5/8 4.760 57.120 685.400
3/4 5.030 60.250 723.000
7/8 5.290 63.450 761.000
15/16 5.420 65.100 781.200
5 5.560 66.750 801.100
1/8 5.840 70.130 841.600
1/4 6.130 73.600 883.200
3/8 6.430 77.150 925.700
7/16 6.600 78.950 947.400
1/2 6.730 80.770 969.200
5/8 7.040 84.480 1013.800
3/4 7.360 88.290 1059.000
15/16 7.840 94.140 1130.000
6 8.010 96.120<

HARDNESS CONVERSION CHART

TABLE 2A  Approximate Hardness Conversion Numbers for Nonaustenitic Steelsˆ
(Rockwell C to other Hardness Numbers)
Rockwell Superficial Hardness
Rockwell C Scale, 150-kgf Load, Diamond Penetrator Vickers Hardness Number Brinell Hardness, 3000-kgf Load, 10-mm Ball Knoop Hardness, 500-gf Load and Over Rockwell A Scale, 60-kgf Load, Diamond Penetrator 15N Scale, 15-kgf Load, Diamond Penetrator 30N Scale 30-kgf Load, Diamond Penetrator 45N Scale, 45-kgf Load, Diamond Penetrator Approximate Tensile Strength, ksi (MPa)
48 484 455 510 74.7 84.5 66.7 52.5 238 (1640)
47 471 442 495 74.1 83.9 65.8 51.4 229 (1580)
46 458 432 480 73.6 83.5 64.8 50.3 221 (1520)
45 446 421 466 73.1 83.0 64.0 49.0 215 (1480)
44 434 409 452 72.5 82.5 63.1 47.8 208 (1430)
43 423 400 438 72.0 82.0 62.2 46.7 201 (1390)
42 412 390 426 71.5 81.5 61.3 45.5 194 (1340)
41 402 381 414 70.9 80.9 60.4 44.3 188 (1300)
40 392 371 402 70.4 80.4 59.5 43.1 182 (1250)
39 382 362 391 69.9 79.9 58.6 41.9 177 (1220)
38 372 353 380 69.4 79.4 57.7 40.8 171 (1180)
37 363 344 370 68.9 78.8 56.8 39.6 166 (1140)
36 354 336 360 68.4 78.3 55.9 38.4 161 (1110)
35 345 327 351 67.9 77.7 55.0 37.2 156 (1080)
34 336 319 342 67.4 77.2 54.2 36.1 152 (1050)
33 327 311 334 66.8 76.6 53.3 34.9 149 (1030)
32 318 301 326 66.3 76.1 52.1 33.7 146 (1010)
31 310 294 318 65.8 75.6 51.3 32.5 141 (970)
30 302 286 311 65.3 75.0 50.4 31.3 138 (950)
29 294 279 304 64.6 74.5 49.5 30.1 135 (930)
28 286 271 297 64.3 73.9 48.6 28.9 131 (900)
27 279 264 290 63.8 73.3 47.7 27.8 128 (880)
26 272 258 284 63.3 72.8 46.8 26.7 125 (860)
25 266 253 278 62.8 72.2 45.9 25.5 123 (850)
24 260 247 272 62.4 71.6 45.0 24.3 119 (820)
23 254 243 266 62.0 71.0 44.0 23.1 117 (810)
22 248 237 261 61.5 70.5 43.2 22.0 115 (790)
21 243 231 256 61.0 69.9 42.3 20.7 112 (770)
20 238 226 251 60.5 69.4 41.5 19.6 110 (760)
TABLE 2B Approximate Hardness Conversion Numbers for Nonaustenitic Steels
(Rockwell B to other Hardness Numbers)
Rockwell Superficial Hardness
Rockwell B Scale 100-kgf Load 1/16-in. (1.588-mm) Ball Vickers Hardness Number Brinell Hardness, 3000-kgf Load, 10-mm Ball Knoop Hardness, 500-gf Load and Over Rockwell F Scale, 60-kgf Load, 1/16-in. (1.588-mm) Ball Rockwell F Scale, 60-kgf Load, 1/16-in. (1.588-mm) Ball 15T Scale, 15-kgf Load, 1/16-in. (1.588-mm) Ball 30T Scale, 30-kgf Load, 1/16-in. (1.588-mm) Ball 45T Scale, 45-kgf Load, 1/16-in. (1.588-mm) Ball Approximate Tensile Strength ksi (MPa)
100 240 240 251 61.5 93.1 83.1 72.9 166 (800)
99 234 234 246 60.9 92.8 82.5 71.9 114 (785)
98 228 228 241 60.2 92.5 81.8 70.9 109 (750)
97 222 222 236 59.5 92.1 81.1 69.9 104 (715)
96 216 216 231 58.9 91.8 80.4 68.9 102 (705)
95 210 210 226 58.3 91.5 79.8 67.9 100 (690)
94 205 205 221 57.6 91.2 79.1 66.9 98 (675)
93 200 200 216 57.0 90.8 78.4 65.9 94 (650)
92 195 195 211 56.4 90.5 77.8 64.8 92 (635)
91 190 190 206 55.8 90.2 77.1 63.8 90 (620)
90 185 185 201 55.2 89.9 76.4 62.8 89 (615)
89 180 180 196 54.6 89.5 75.8 61.8 88 (605)
88 176 176 192 54.0 89.2 75.1 60.8 86 (590)
87 172 172 188 53.4 88.9 74.4 59.8 84 (580)
86 169 169 184 52.8 88.6 73.8 58.8 83 (570)
85 165 165 180 52.3 88.2 73.1 57.8 82 (565)
84 162 162 176 51.7 87.9 72.4 56.8 81 (560)
83 159 159 173 51.1 87.6 71.8 55.8 80 (550)
82 156 156 170 50.6 87.3 71.1 54.8 77 (530)
81 153 153 167 50.0 86.9 70.4 53.8 73 (505)
80 150 150 164 49.5 86.6 69.7 52.8 72 (495)
79 147 147 161 48.9 86.3 69.1 51.8 70 (485)
78 144 144 158 48.4 86.0 68.4 50.8 69 (475)
77 141 141 155 47.9 85.6 67.7 49.8 68 (470)
76 139 139 152 47.3 85.3 67.1 48.8 67 (460)
75 137 137 150 46.8 99.6 85.0 66.4 47.8 66 (455)
74 135 135 147 46.3 99.1 84.7 65.7 46.8 65 (450)
73 132 132 145 45.8 98.5 84.3 65.1 45.8 64 (440)
72 130 130 143 45.3 98.0 84.0 64.4 44.8 63 (435)
71 127 127 141 44.8 97.4 83.7 63.7 43.8 62 (425)
70 125 125 139 44.3 96.8 83.4 63.1 42.8 61 (420)
69 123 123 137 43.8 96.2 83.0 62.4 41.8 60 (415)
68 121 121 135 43.3 95.6 82.7 61.7 40.8 59 (405)
67 119 119 133 42.8 95.1 82.4 61.0 39.8 58(400)

SURFACE ROUGHNESS

Ra (micrometers) Ra (microinches) RMS CLA (N) Rt N Cut-off Length
inch mm
0.025 1 1.1 1 0.3 1 0.003 0.08
0.05 2 2.2 2 0.5 2 0.01 0.25
0.1 4 4.4 4 0.8 3 0.01 0.25
0.2 8 8.8 8 1.2 4 0.01 0.25
0.4 16 17.6 16 2.0 5 0.01 0.25
0.8 32 32.5 32 4.0 6 0.03 0.8
1.6 63 64.3 63 8.0 7 0.03 0.8
3.2 125 137.5 125 13 8 0.1 2.5
6.3 250 275 250 25 9 0.1 2.5
12.5 500 550 500 50 10 0.1 2.5
25.0 1000 1100 1000 100 11 0.3 8.0
50.0 2000 2200 2000 200 12 0.3 8.0
Ra = Roughness Average in micrometers or microinches.
RMS = Root Mean Square in microinches
CLA = Center Line Average in Microinches
Rt = Roughness Ttal in microns
N = New ISO (grade) scale numbers
Порезка = Length required for sample.

INCHES TO MM

inch Metric(mm) inch Metric(mm)
1/4 6.35 3 76.2
5/16 7.94 3 1/8 79.37
3/8 9.53 3 1/4 82.55
7/16 11.11 3 3/8 85.72
1/2 12.7 3 1/2 88.9
9/16 14.29 3 5/8 92.07
5/8 15.88 3 3/4 95.25
11/16 17.46 3 7/8 98.42
3/4 19.05 4 101.6
13/16 20.64 4 1/8 104.77
7/8 22.23 4 1/4 107.95
15/16 23.81 4 3/8 111.12
1 25.4 4 1/2 114.3
1 1/8 28.57 4 5/8 117.47
1 1/4 31.75 4 3/4 120.65
1 3/8 34.93 4 7/8 123.82
1 1/2 38.1 5 127
1 5/8 41.28 5 1/8 130.17
1 3/4 44.45 5 1/4 133.52
1 7/8 47.63 5 3/8 136.8
2 50.8 5 1/2 139.7
2 1/8 53.97 5 5/8 142.87
2 1/4 57.15 5 3/4 146.05
2 3/8 60.32 5 7/8 149.22
2 1/2 63.5 6 152.4
2 5/8 66.67 6 1/8 155.57
2 3/4 69.85 6 1/4 158.75
2 7/8 73.02 6 3/8 161.92

FEET TO MM

Feet (ft’) Meter (Mtr) Feet (ft’) Meter (Mtr)
1 0.3 21 6.4
2 0.61 22 6.71
3 0.91 23 7.01
4 1.22 24 7.32
5 1.52 25 7.62
6 1.83 26 7.92
7 2.13 27 8.23
8 2.44 28 8.53
9 2.74 29 8.84
10 3.05 30 9.14
11 3.35 31 9.45
12 3.66 32 9.75
13 3.96 33 10.06
14 4.27 34 10.36
15 4.57 35 10.67
16 4.88 36 10.97
17 5.18 37 11.28
18 5.49 38 11.58
19 5.79 39 11.89
20 6.1 40 12.19
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