Ground Bar Tolerances


Our steel bar can be centreless ground to your exact sizes and tolerances.

Below we list the standard ISO tolerances for precision ground, bright drawn, smooth turned and polished round steel bar (diameters).
 

Metric Diameters

Dia – mmISO h6ISO h7ISO h8ISO h9ISO h10ISO h11
1 < 30.0060.0100.0140.0250.0400.060
3 < 60.0080.0120.0180.0300.0480.075
6 < 100.0090.0150.0220.0360.0580.090
10 < 180.0110.0180.0270.0430.0700.110
18 < 300.0130.0210.0330.0520.0840.130
30 < 500.0160.0250.0390.0620.1000.160
50 < 800.0190.0300.0460.0740.1200.190
80 < 1200.0220.0350.0540.0870.1400.220
120 < 1800.0630.1000.1600.250
180 < 2500.0720.1150.1850.290
250 < 2750.0810.1300.2100.320

 

Imperial Diameters

Dia – inchesISO h6ISO h7ISO h8ISO h9ISO h10ISO h11
0.039 < 0.1180.000250.00040.00060.00100.00160.0024
0.118 < 0.2360.00030.00050.00070.00120.00190.0030
0.236 < 0.3930.00040.00060.00090.00140.00230.0035
0.393 < 0.7070.00040.00070.00100.00160.00280.0043
0.707 < 1.1810.00050.00080.00120.00200.00350.0051
1.181 < 1.9690.00060.00100.00160.00250.00400.0063
1.969 < 3.1500.00070.00120.00180.00300.00460.0075
3.150 < 4.7240.00090.00140.00220.00350.00550.0087
4.724 < 7.0870.00250.00390.00630.0098
7.087 < 9.8430.00280.00450.00730.0114
9.843 <10.8270.00310.00510.00830.0126