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Reference Standard
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Reference Standard
① Diameter Tolerance
Grade Diameter
Range		 h7 h8 h9 h10 h11 h12
D ≤ 3 0-0.010 0-0.014 0-0.025 0-0.040 0-0.060 0-0.10
3 < D ≤ 6 0-0.012 0-0.018 0-0.030 0-0.048 0-0.075 0-0.12
6 < D ≤ 10 0-0.015 0-0.022 0-0.036 0-0.058 0-0.090 0-0.15
10 < D ≤ 18 0-0.018 0-0.027 0-0.043 0-0.070 0-0.11 0-0.18
18 < D ≤ 30 0-0.021 0-0.033 0-0.052 0-0.084 0-0.13 0-0.21
30 < D ≤ 50 0-0.025 0-0.039 0-0.062 01-0.100 0-0.16 0-0.25
50 < D ≤ 80 0-0.030 0-0.046 0-0.074 0-0.12 0-0.19 0-0.30
80 < D ≤ 120 0-0.035 0-0.054 0-0.087 0-0.14 0-0.22 0-0.35

② Stainless Steel

Classification Standards
KS(STS) JIS(SUS) AISI
Austenitic 303/F 303/F/C 303
304/S,H,M 304/S,H,M 304
304L 304L 304L
305 305 305
316 316 316
316L 316L 316L
321 321 321
Ferritic 410L 410L 410L
430/F 430/F 430
Martensitic 403 403 403
410 410 410
416 416 416
420J1/2 420J1/2 420
440/A,B,C 440/A,B,C 440/A,B,C

③ Carbon Steel

Classification Standards
KS JIS AISI
for general SM10C/55C S10C/55C 1010/1055
for carburizing SM09CK/20CK S09CK/20CK 1010/1020
for free cutting SUM11/24L SUM11/24L 1110/12L14

④ Steel For Tool &Special Use
Classification Standards
KS JIS AISI
Bearing Steel STB 1/5 SUJ 1/5 51100/52100
Spring Steel SPS 1,3,45,5A,67,8,9 SUP 3,6,79,9A,1011A,12,13 1078,92605155,615051B60/92544161

⑤ Alloy Steel
Classification Standards
KS JIS AISI
Cr SCr415/445 SCr415/445 5120/5140
Mn SMn420/443 SMn420/443 1522/1541
Mn-Cr SMnC420/443 SMnC420/443 1335/1345
Cr-Mo SCM415/822 SCM415/822 4130/4147
Ni-Cr SNC236/836 SNC236/836
Ni-Cr-Mo SNCM220/815 SNCM220/815 8615/8640 4320/4340
H-band SCr415H/440H SCr415H/440H 5120H/5140H
SMn420H/443H SMn420H/443H 1522H/1541H
SMnC420H/443H SMnC420H/443H 1335H/1345H
SCM415H/822H SCM415H/822H 4135H/4147H
SNC415H/815H SNC415H/815H
SNCM220H/420H SNCM220H/420H 8617H/8622H 4320H





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