ISO Tolerances for Stainless Steel Bar

The ISO tolerances shown are taken from ISO 286.

Tolerances in mm for Given Tolerance Number

Diameters (mm) 6 7 8 9 10 11 12 13

Diameters (mm)

6

7

8

9

10

11

12

13

>1 ≤ 3

0.007

0.009

0.014

0.025

0.040

0.060

0.090

0.140

>3 ≤ 6

0.008

0.012

0.018

0.030

0.048

0.075

0.120

0.180

>6 ≤ 10

0.009

0.015

0.022

0.036

0.058

0.090

0.150

0.220

>10 ≤ 18

0.011

0.018

0.027

0.043

0.070

0.110

0.180

0.270

>18 ≤ 30

0.013

0.021

0.033

0.052

0.084

0.130

0.210

0.330

>30 ≤ 50

0.016

0.025

0.039

0.062

0.100

0.160

0.250

0.390

>50 ≤ 80

0.019

0.046

0.074

0.120

0.190

0.300

0.460

>80 ≤ 120

0.022

0.087

0.140

0.220

0.350

0.540

>120 ≤ 180

0.025

0.100

0.160

0.250

0.400

0.630

>180 ≤ 250

0.115

0.185

0.290

0.460

0.720

>250 ≤ 315

0.320

0.520

0.810

>315 ≤ 400

0.360

0.570

0.890

>400 ≤ 500

0.400

0.630

0.970

>500

0.440

0.700

1.100

EXAMPLES

H = All Minus tolerance e.g. 45 mm dia H9 = + 0/- 0.062

J = Tolerance divided e.g. 45 mm dia J9 = +/- 0.031

K = All Plus tolerance e.g. 45 mm dia K9 = + 0.062 / - 0
The K tolerance is usually only applied to larger diameter bars (Over 75mm)

H8 = Precision Ground

H9 = Bright Drawn

H10 = Smooth Turned

Find your local Service Centre

An extensive UK network of Service Centres, backed up by a central distribution facility.

Warehouse - Righton Blackburns

Find your local Service Centre

An extensive UK network of Service Centres, backed up by a central distribution facility.

  • Experienced multi-product specialists

  • In-house state of the art processing facilities

  • Large fleet of bespoke delivery vehicles

RBL Truck Retouched
Aerospace