EN Standards for Stainless Steel Bar
The old BS970 Parts 1 & 3: 1991 standards have been replaced by a number of EN Standards, the most important of which are shown below
- EN10088-3 Replaces BS970 Part 1: 1991 & BS970 Part 3: 1991 covering chemical composition & mechanical properties
- EN 10058, Hot rolled flat steel bars for general purposes – Dimensions and tolerances on shape and
- dimensions.
- EN 10059, Hot rolled square steel bars for general purposes – Dimensions and tolerances on shape and
- dimensions.
- EN 10060, Hot rolled round steel bars for general purposes – Dimensions and tolerances on shape and
- dimensions.
- EN 10061, Hot rolled hexagon steel bars for general purposes – Dimensions and tolerances on shape and
- dimensions
- EN 10278, Dimensions and tolerances of bright steel products.(Drawn, Turned or Ground)
BS 970-3:1991
Specification for
Wrought steel for mechanical and allied engineering purposes
Part 3: Bright bars for general engineering purposes
ISO 286 Tolerances in mm
EXAMPLES:
H = All Minus Tolerance e.g. 45mm dia. H9 = +0 / -0.062
J = Tolerance Divided e.g. 45mm dia. J9 = +/- 0.031
K = All Plus Tolerance e.g. 45mm 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
BS EN 10060
Tolerance on diameter for general purposes
| Nominal size range | Limit deviation |
|---|---|
| between 10 and 15 | +/- 0.4 |
| between 16 and 25 | +/- 0.5 |
| between 26 and 35 | +/- 0.6 |
| between 36 and 50 | +/- 0.8 |
| between 52 and 80 | +/- 1.0 |
| between 85 and 100 | +/- 1.3 |
| between 105 and 120 | +/- 1.5 |
| between 125 and 160 | +/- 2.0 |
| between 165 and 200 | +/- 2.5 |
| 220 | +/- 3.0 |
| 250 | +/- 4.0 |
Notes
All dimensions are in mm.
If agreed at the enquiry and order stage the limit deviations on size(edge) can be all plus, minus zero, rather than equal plus / minus.
Tolerance on diameter for precision purposes
| Nominal size range | Limit deviation |
|---|---|
| between 10 and 12 | +/- 0.15 |
| between 13 and 22 | +/- 0.20 |
| between 24 and 30 | +/- 0.25 |
| between 32 and 40 | +/- 0.30 |
| between 42 and 52 | +/- 0.40 |
| between 55 and 75 | +/- 0.50 |
Notes
All dimensions are in mm.
Ovality
The standard specifies the tolerance on ovality as a maximum of 75% of the tolerances ranges given tables 1 and 2 of the standard.
Length tolerances
Table 4 of the standard categorises the type of length and notes that it is the purchaser’s responsibility to indicate at enquiry and order stages the type of length required and the length range or length required. No further explanation of the terms used in the standard is given. The table below is based on Table 4 of the standard.
| Type of length | Range | Limit deviation |
|---|---|---|
| Manufacturing length (M) | 3000 to 13000 with a range of 2000 per order item | 10% of bars may be below the minimum for the ordered range, but not less than 75% of the minimum of the range |
| Fixed length (F) | 3000 to 13000 | +/- 100 |
| Exact length (E) | below 6000 | +/- 25 |
| – | between 6000 and 13000 | +/- 50 |
Notes
All dimensions are in mm.
If agreed at the enquiry and order stage, limit deviations (ranges) can be all plus, minus zero, rather than equal plus / minus.
Bright Steel Bar Dimension Tolerance(UNI EN 10278:2002)
Dimensional Tolerances
- Bright drawn ISO h8 - h9 - h11
- Centerless ground ISO h7
- Centerless ground ISO h6, f6, g6 and other tolerances ISO h6, f6, g6 and other tolerances
Actual dimension of the bar shall be measured at least 150 mm from the end of the bar, in accordance to EN 10278.
*The table includes also the k13 tolerance uses for rough turned stainless steel products This deviation is over the nominal dimension.
R= Round / S= Square / F= Flat / H= Hexagon
The dimensional tolerances shall be chosen among those allowed in the table；