Grade Designations.
| BS 970:1991 (withdrawn) | 080A42 |
| Nearest EN equivalent | C42E / C45E (BS EN 10083-2) |
| AISI/SAE | 1042 / 1045 |
| DIN | C42 / 1.0540 |
| ISO | C42E |
Availability & Supply Condition.
Bright Rounds: 6–150mm | Squares: 16–100mm (bright) | Hexagons: 6–75mm AF (bright)
Supply condition: Bright Drawn. Supplied to chemical analysis only — no mechanical test certificate.
Cut to length from 1 piece — −0/+2mm standard tolerance — 2–3 day turnaround — Cutting service details ›
Chemical Analysis.
Values shown as percentages by weight (% wt). Values are ranges unless stated as maxima.
| Designation | C | Si | Mn | P max | S max |
|---|---|---|---|---|---|
| 080A42 | 0.40–0.45 | 0.10–0.40 | 0.60–1.00 | 0.05 | 0.05 |
For full chemical analysis with heat number, request an EN 10204 3.1 material test certificate when ordering — available on all alloy grades. Certificate types explained ›
Mechanical Properties.
Values shown for standard supply condition. Properties vary by section size and heat treatment condition.
| Condition | Tensile Rm (N/mm²) approx | Hardness HB approx |
|---|---|---|
| Bright Drawn (normalised) | ~570–720 | ~170–210 |
Hardness values: see our hardness conversion table to convert between HRC, HB, HV and tensile strength.
Typical Applications.
- Bolts, studs and nuts — medium tensile
- General turned components
- Lightly stressed shafts and spindles
- Keys and couplings
- Bright-drawn bar applications
Key Benefits.
- Cost-effective where EN8 mechanical certification not required
- Good machinability in bright drawn condition
- Suitable for flame hardening
- Wide range of sizes from stock
Remarks & Guidance.
For applications requiring guaranteed mechanical properties, specify EN8 (080M40). 080A42 can be flame or induction hardened to 48–55 HRC with appropriate section size and conditioning.
Relevant Heat Treatment Processes.
This grade responds to the following heat treatment processes. Click any card for temperatures, cooling methods and expected hardness values.
