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Ground Bar

Precision Ground Bar, also known as ‘Turned Ground and Polished’ shafting, refers to round bars made with fine precision and high-quality steel. They are polished to ensure flawless and perfectly straight surfaces. The manufacturing process is designed for extremely close tolerances for surface finish, roundness, hardness, and straightness which ensures a long service life with reduced maintenance. The precision ground bar is commonly used often used in applications that require high accuracies, such as weather measuring devices, laboratory tools, high-speed motor shafts, drive shafts, pump shafts, and ball bushings. In these scenarios, the bar is often required to rotate at high speeds. Thus extreme straightness is critical to prevent unwanted vibration and wear on bearings. Precision ground bar is manufactured through induction hardening.

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Material Available Shapes

Other Grades of Steel

Tolerances

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Material Available Shapes

Other Grades of Steel

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). Below we list details of the popular ISO ‘h’ tolerances, we can also produce to tight tolerances to ISO 286 such as g5, g6, d8, d9 etc.
Metric Diameters

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Dia – mm	ISO h6	ISO h7	ISO h8	ISO h9	ISO h10	ISO h11
1 < 3	0.006	0.010	0.014	0.025	0.040	0.060
3 < 6	0.008	0.012	0.018	0.030	0.048	0.075
6 < 10	0.009	0.015	0.022	0.036	0.058	0.090
10 < 18	0.011	0.018	0.027	0.043	0.070	0.110
18 < 30	0.013	0.021	0.033	0.052	0.084	0.130
30 < 50	0.016	0.025	0.039	0.062	0.100	0.160
50 < 80	0.019	0.030	0.046	0.074	0.120	0.190
80 < 120	0.022	0.035	0.054	0.087	0.140	0.220
120 < 180	–	–	0.063	0.100	0.160	0.250
180 < 250	–	–	0.072	0.115	0.185	0.290
250 < 275	–	–	0.081	0.130	0.210	0.320

Showing 1 to 11 of 11 entries

Imperial Diameters

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Dia – inches	ISO h6	ISO h7	ISO h8	ISO h9	ISO h10	ISO h11
1/32 < 1/8	0.00025	0.0004	0.0006	0.0010	0.0016	0.0024
1/8 < 15/64	0.0003	0.0005	0.0007	0.0012	0.0019	0.0030
15/64 < 25/64	0.0004	0.0006	0.0009	0.0014	0.0023	0.0035
25/64 < 45/64	0.0004	0.0007	0.0010	0.0016	0.0027	0.0043
45/64 < 1 3/16	0.0005	0.0008	0.0012	0.0020	0.0033	0.0051
1 3/16 < 2	0.0006	0.0010	0.0016	0.0025	0.0039	0.0063
2 < 3 1/8	0.0007	0.0012	0.0018	0.0030	0.0047	0.0075
3 1/8 < 4 3/4	0.0009	0.0014	0.0022	0.0035	0.0055	0.0087
4 3/4 < 7 3/32	–	–	0.0025	0.0039	0.0063	0.0098
7 3/32 < 10	–	–	0.0028	0.0045	0.0073	0.0114
10 < 10 7/8	–	–	0.0031	0.0051	0.0083	0.0126