GRADE GUIDE · EN8
EN8 (080M40, close to AISI 1040) is plain medium-carbon steel — the economical step between mild steel and the alloy grades. With around 0.40% carbon it takes useful hardness and strength without alloy pricing, making it the everyday bar for shafts, axles, keys, studs and general machined parts.
Also listed as: 080M40 · ≈ AISI 1040 · C40 / 1.0511 (near) · EN8D bright bar
Stock turns over piece by piece — what's listed is what exists. Post the spec you need and we match it against incoming material; you're alerted the moment something lands.
Most turned parts don't need chromoly: a conveyor shaft, a clevis pin, a machine key or a bolt blank simply needs more strength than mild steel and a surface that can be toughened. EN8 covers exactly that band — machinable in the normalised condition at around 280 MPa yield, flame- or induction-hardenable on wear surfaces, and priced close to ordinary bright bar.
Its plain-carbon chemistry cuts both ways: hardenability is shallow, so big sections won't through-harden and heavy strength requirements push you to 4140 or EN24. In Gulf machine shops EN8 bright bar is the default lathe feedstock, and bar-end off-cuts are among the most common listings on the platform — short certified lengths at workshop-friendly prices.
EN8 covers lightly to moderately loaded parts and surface-hardened wear faces. Once the design calls for through-hardened strength, large sections or fatigue-critical duty, the alloy grades take over.
Yes, with more care than mild steel — its 0.40% carbon likes a modest preheat and low-hydrogen electrodes on thicker sections to avoid hard, crack-prone weld zones.
Delivery form: EN8D is the bright-drawn version — tighter tolerance, better finish, slightly cold-work-strengthened. Machine shops feeding lathes usually buy bright bar.