Carbon & alloy steel
EN8 (080M40) is an unalloyed medium-carbon steel bar with good tensile strength, supplied untreated or normalised for shafts, studs and general machined parts.
- Spec BS 970 (080M40)
- Density 7.85 g/cm³
Also known as / equivalents
| System | Designation |
|---|---|
| Also known as | EN8, 080M40 |
Chemical composition
| Element | Min % | Max % |
|---|---|---|
| C | 0.36 | 0.44 |
| Mn | 0.60 | 1.00 |
| Si | 0.10 | 0.40 |
| S | — | 0.050 |
| P | — | 0.050 |
| Fe | Bal. | — |
Physical properties
| Property | Metric | Imperial |
|---|---|---|
| Density | 7.85 g/cm³ | 0.284 lb/in³ |
| Magnetic response | Magnetic | — |
Available forms & specifications
| Form | Specification | Size range |
|---|---|---|
| Pipe | ASTM A106, A53 | 1/8" – 24" NB |
| Flanges & forgings | ASTM A105 | 1/2" – 48" NB (larger on request) |
| Buttweld fittings | ASTM A234 | 1/2" – 48" NB |
| Bars | BS 970 (EN8) | 3 mm – 500 mm |
Corrosion & temperature resistance
Carbon steels have no inherent corrosion resistance; they are painted, galvanised or lined for corrosive service. A106 and A105 are rated for elevated-temperature pressure service.
Applications
EN8 (080M40): Shafts, axles, studs, gears. Process and utility piping, pressure-system flanges and fittings, shafts and general engineering.
Frequently asked questions
What is EN8 (080M40) used for?
Medium-carbon machining bar. Typical uses: shafts, axles, studs, gears.
Is EN8 (080M40) magnetic?
Magnetic.
In which forms can I buy EN8 (080M40) from Rajkamal Metals?
Sheets & Plates, Pipes & Tubes, Round Bars & Rods, Structural Sections, Flanges, Buttweld Fittings, Socket Weld & Threaded Fittings, Fasteners, Dish Ends, Custom Orders. Sizes as per standard; other sizes on request.
Do you supply a Mill Test Certificate with EN8 (080M40)?
Yes. Actual values are given in the Mill Test Certificate (EN 10204 3.1) supplied with each order.
Last updated: 30 October 2026. Grade names identify the supply range; designations are not engineering equivalents. Availability, make, origin and documentation are confirmed at quotation.
Request a quote
Need EN8 (080M40)?
Send the grade, form, size, quantity and destination. Price on request — every offer is prepared against your specification.