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BS 970 EN31 vs SAE J404 E52100

Close Alternative — 82.6% match based on chemical composition and mechanical property overlap.

BS 970 EN31 (BS 970:1955) and SAE J404 E52100 (SAE J404:2000) are both steel grades. Both fall under the Alloy Steel category. BS 970 EN31 is typically used for ball and roller bearings, gauges, dies, while SAE J404 E52100 is commonly used for chemistry-only alloy steel grade; see the composition notes for product scope. BS 970 EN31 is defined under British Standards (BS), originating from United Kingdom, while SAE J404 E52100 is defined under SAE International, originating from United States.

As per chemical composition, BS 970 EN31 vs SAE J404 E52100 is a 82.6% match. Mechanical property data is not available for both grades, so this factor could not be scored. Combined, this makes them a close alternative overall at 82.6%.

Frequently Compared With BS 970 EN31:
UNI 11234 100Cr6 NF A35-565 100C6 GB/T 3077 12Cr2Ni4A IS 1570 (Part 4) 103Cr4 IS 1570 (Part 4) 105Cr5 GOST 4543 12HN3A IS 1570 (Part 4) 103Cr6 IS 4367 07Cr4Mo6 IS 1570 (Part 7) 10Cr36Mo10H IS 1570 (Part 4) 07Cr4Mo6 IS 1570 (Part 4) 10Cr20Mo6 IS 4367 10Cr9Mo10
Match Breakdown
CHEMISTRY MATCH
82.6%
MECHANICAL MATCH
No shared data
OVERALL
82.6%
Specifications
Property BS 970 EN31 SAE J404 E52100
Standard BS 970:1955 SAE J404:2000
Category Alloy Steel Alloy Steel
C (%) 0.90-1.20 0.98-1.10
Si (%) 0.10-0.35 0.15-0.35
Mn (%) 0.30-0.75 0.25-0.45
Cr (%) 1.00-1.60 1.30-1.60
S (%) <=0.050 <=0.025
P (%) <=0.050 <=0.025
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 EN31 SAE J404 E52100
Hardness (HB) ≤229 (softened) Not specified
Typical Applications
BS 970 EN31
Ball and roller bearings, gauges, dies
SAE J404 E52100
Chemistry-only alloy steel grade; see the composition notes for product scope
Can BS 970 EN31 Be Substituted With SAE J404 E52100?
BS 970 EN31 and SAE J404 E52100 are a close alternative rather than a direct substitute. Some properties overlap well, but check the specific chemistry and mechanical rows above against your application's requirements before treating them as interchangeable.
Forms & Sizes Available on M-EX
BS 970 EN31
Round Bar → (23 listings)
Diameter: 40–50 mm (1.57–1.97 in)
Length: 2500–7000 mm (98.43–275.59 in)
Hex Bar → (3 listings)
Across Flats: 50–50 mm (1.97–1.97 in)
Length: 2600–3300 mm (102.36–129.92 in)
Flat Bar → (3 listings)
Thickness: 25–25 mm (0.98–0.98 in)
Width: 120–120 mm (4.72–4.72 in)
Length: 2500–3600 mm (98.43–141.73 in)
SAE J404 E52100
No active listings currently.
On M-EX Right Now
BS 970 EN31
29 active listings and RFQs →
SAE J404 E52100
0 active listings and RFQs →
Frequently Asked Questions
What is the difference between BS 970 EN31 and SAE J404 E52100?
Both grades share a similar composition profile; see the specification table above for the exact chemistry and mechanical property values.
Can BS 970 EN31 be substituted with SAE J404 E52100?
BS 970 EN31 and SAE J404 E52100 are a close alternative rather than a direct substitute. Some properties overlap well, but check the specific chemistry and mechanical rows above against your application's requirements before treating them as interchangeable.