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BS 970 EN8D vs BS 970 (Part 1) 040A12

Related Material — 69.9% match based on chemical composition and mechanical property overlap.

BS 970 EN8D (BS 970:1955) and BS 970 (Part 1) 040A12 (BS 970 (Part 1):1991) are both steel grades. Both fall under the Carbon Steel category. BS 970 EN8D is typically used for dynamo and motor shafts; after heat treatment bolts, studs, crankshafts, connecting rods, flanges, railway couplings, axles and brackets, while BS 970 (Part 1) 040A12 is commonly used for as-rolled, or as-rolled and softened, steel (section two). BS 970 EN8D is defined under British Standards (BS), originating from United Kingdom, while BS 970 (Part 1) 040A12 is defined under British Standards (BS), originating from United Kingdom.

As per chemical composition, BS 970 EN8D vs BS 970 (Part 1) 040A12 is a 79% match. Mechanical property data is not available for both grades, so this factor could not be scored. Combined, this makes them a related material overall at 69.9%.

Frequently Compared With BS 970 EN8D:
BS 970 (Part 1) 040A10 BS 970 (Part 1) 080A20 BS 970 (Part 3) 070M55 BS 970 (Part 1) 045A10 BS 970 (Part 3) 045A10 BS 970 (Part 1) 045M10 BS 970 (Part 3) 045M10 BS 970 (Part 1) 040A04 BS 970 (Part 1) 045A10 BS 970 (Part 1) 045M10 BS 970 (Part 1) 055M15 BS 970 (Part 1) 060A32
Match Breakdown
CHEMISTRY MATCH
79%
MECHANICAL MATCH
No shared data
OVERALL
69.9%
Specifications
Property BS 970 EN8D BS 970 (Part 1) 040A12
Standard BS 970:1955 BS 970 (Part 1):1991
Category Carbon Steel Carbon Steel
C (%) 0.40-0.45 0.10-0.15
Si (%) 0.05-0.35 Not specified
Mn (%) 0.70-0.90 0.30-0.50
S (%) <=0.060 Not specified
P (%) <=0.060 Not specified
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Mechanical Properties
Property BS 970 EN8D BS 970 (Part 1) 040A12
Tensile Strength ≥541 MPa (35 tons/sq in, converted) Not specified
Yield Strength ≥278 MPa (18 tons/sq in, converted) Not specified
Elongation ≥20% Not specified
Hardness 152-207 HB Not specified
Condition NGC 1, Normalised, ruling section 6 in (lowest-strength condition of the standard) Not specified
Typical Applications
BS 970 EN8D
Dynamo and motor shafts; after heat treatment bolts, studs, crankshafts, connecting rods, flanges, railway couplings, axles and brackets
BS 970 (Part 1) 040A12
As-rolled, or as-rolled and softened, steel (section two)
Key Differences
Can BS 970 EN8D Be Substituted With BS 970 (Part 1) 040A12?
BS 970 EN8D and BS 970 (Part 1) 040A12 share some compositional similarity but differ enough that substitution should not be assumed. Review the differences above carefully, and consult the applicable standard or a metallurgist before using one in place of the other.
Forms & Sizes Available on M-EX
BS 970 EN8D
Round Bar → (4 listings)
Diameter: 40–55 mm (1.57–2.17 in)
Length: 5500–7000 mm (216.54–275.59 in)
BS 970 (Part 1) 040A12
No active listings currently.
On M-EX Right Now
BS 970 EN8D
4 active listings and RFQs →
BS 970 (Part 1) 040A12
0 active listings and RFQs →
Frequently Asked Questions
What is the difference between BS 970 EN8D and BS 970 (Part 1) 040A12?
BS 970 EN8D specifies Si, S, P which are not specified for BS 970 (Part 1) 040A12.
Can BS 970 EN8D be substituted with BS 970 (Part 1) 040A12?
BS 970 EN8D and BS 970 (Part 1) 040A12 share some compositional similarity but differ enough that substitution should not be assumed. Review the differences above carefully, and consult the applicable standard or a metallurgist before using one in place of the other.