Technical Datasheet
EN8M
EN8M Free Cutting Bright Bar
Medium Carbon Steel
Kalika Enterprises
Bright Bar Manufacturer
Plot No. 12/1, Gut No. 182, Jogeshwari, MIDC Waluj, Chhatrapati Sambhajinagar, Maharashtra 431136, India
+91 94229 27509 · kalikaent9@gmail.com
Medium carbon strength with free cutting machinability — the best of both families. EN8M answers a common shop floor problem: the part needs medium carbon strength, but it also needs a lot of turning, and plain EN8 is slow to machine.
Also known as: 212M44 · AISI 1144
Key advantage
About one-third faster to machine than EN8
Added sulphur breaks the chip and lubricates the cut, so spindle speeds go up and tool changes go down while tensile strength stays in the EN8 class. On a high-volume turned shaft or stud, that is the difference between meeting the schedule and missing it.
Chemical composition
BS 970 Part 3 : 212M44, certified per mill test certificate
| Element | Min % | Max % |
|---|---|---|
| C Carbon | 0.350 | 0.450 |
| Si Silicon | — | 0.250 |
| Mn Manganese | 0.900 | 1.300 |
| P Phosphorus | — | 0.060 |
| S Sulphur | 0.120 | 0.200 |
Mechanical properties
Cold Drawn
| Property | Value |
|---|---|
| Tensile Strength | 620 – 780 MPa |
| Yield Strength | 470 – 560 MPa |
| Elongation (A5) | 8 – 14% |
| Hardness | 190 – 240 HB |
| Impact toughness | Lower than EN8Sulphide inclusions reduce transverse ductility — avoid heavy shock loading |
Available sizes and tolerances
| Shape | Size range |
|---|---|
| Round | 6 – 60 mm |
| Hex (AF) | 7 – 46 mm |
| Tolerance | h9 / h10 / h11 |
| Standard lengths | 3, 4, 5, 6 metre or cut to size |
ISO 286 tolerance values (µm)
| Size (mm) | h9 | h10 | h11 |
|---|---|---|---|
| over 6 to 10 | −36 | −58 | −90 |
| over 10 to 18 | −43 | −70 | −110 |
| over 18 to 30 | −52 | −84 | −130 |
| over 30 to 50 | −62 | −100 | −160 |
| over 50 to 80 | −74 | −120 | −190 |
Typical applications
- High-volume turned shafts and studs
- Machined pins, bushes and adaptors
- Automatic lathe components needing strength
- Hydraulic fittings and valve bodies
- Induction hardened wear surfaces
International equivalents
| BS (UK) | 212M44 / EN8M |
| AISI / SAE (USA) | 1144 |
| DIN (Germany) | 44SMn28 / 1.0762 |
| JIS (Japan) | SUM43 |
| IS (India) | 40C15S12 |
Heat treatment guidelines
| Operation | Parameters |
|---|---|
| Hardening | 820 – 860 °C, quench in oil |
| Tempering | 550 – 660 °C, air cool |
| Induction hardening | Suitable for localised surface hardening to 50 – 55 HRC |
Machinability index
80 Very Good
Relative to AISI 1212 = 100
Weldability
Limited
Supply condition
Cold Drawn