Steel TypeStandards
Standard Outer Diameter Tolerance of the Product (μ)
In principle, specifications in table shall not be applied to both bar ends,that is, 20 – 30 mm length from non-painted end and 50 mm length from painted end. Roundness and round of parallelness shall not exceed 30% and 50% of the tolerance, respectively.
| Size range （mm） |
1.0～3.0 | 3.01～6.0 | 6.01～10.0 | 10.01～18.0 | 18.01～30.0 | 30.01～45.0 | ||||||
| JIS | Max | Min | Max | Min | Max | Min | Max | Min | Max | Min | Max | Min |
| h6 | +0 | -6 | +0 | -8 | +0 | -9 | +0 | -11 | ||||
| h7 | +0 | -10 | +0 | -12 | +0 | -15 | +0 | -18 | +0 | -21 | +0 | -25 |
| h8 | +0 | -14 | +0 | -18 | +0 | -22 | +0 | -27 | +0 | -33 | +0 | -39 |
| h9 | +0 | -25 | +0 | -30 | +0 | -36 | +0 | -43 | +0 | -52 | +0 | -62 |
| ｈ10 | +0 | -40 | +0 | -48 | +0 | -58 | +0 | -70 | +0 | -84 | +0 | -100 |
| High precision ground bar | Standard ground bar | High precision drawn bar | Standard drawn bar | Drawn profile bar |
*For normal order of ground and drawn product, tolerance range of JIS h7 and h9 are applied, respectively.
Standard Product Length(mm)
| Norminal length | Length tolerance | |
|---|---|---|
| Drawn product | 2000～4000 | +20,-0 |
| Ground product | 2000～3000 | +20,-0 |
| Short product | 300～600 | +2,-0 |
*in case of short product (length 300-600mm),tolerance applied is +2mm,-0mm.
Standard Straightness (mm)
Figures in table show straightness by total indication renge (T.I.R). L=1000 (When support span is 1m) is applied to the products of φ8 to φ16mm, and L=400 is applied to the products of φ5 to φ16mm.
 |
Free cutting steel | Stainless steel | |||
|---|---|---|---|---|---|
| Drawn product | Ground product | Drawn product | Ground product | ||
| For general product | L=1000 | Max0.6 | Max0.5 | Max0.8 | Max0.7 |
| For general shaft | L=1000 | Max0.4 | Max0.3 | Max0.6 | Max0.5 |
| L=400 | Max0.08 | Max0.06 | Max0.15 | Max0.1 | |
| For high precision shaft | Higher requirement than above may be satisfied on request | ||||
*T.I.R. for general shaft of L=400 is applied to product’s size from φ5 to φ16mm.
Surface Roughness (μ)
| Size（mm） | Rz(10 points mean roughness) | Ry(Former Rmax, Maximum roughness) | |
|---|---|---|---|
| Ground product | φ1.0～φ20.0 | 2.5 | 3.2 |
| Drawn product | φ2.0～φ6.0 | 5.0 | – |
| φ6.1～φ10.0 | 7.0 | – | |
| φ10.1～φ20.0 | 10.0 | – |