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SAE J404 4137 vs BS 970 (Part 1) 708A37

Strong Match — 89.6% match based on chemical composition and mechanical property overlap.

SAE J404 4137 (SAE J404:2009) and BS 970 (Part 1) 708A37 (BS 970 (Part 1):1983) are both steel grades. Both fall under the Alloy Steel category. SAE J404 4137 is typically used for chemistry-only alloy steel grade; see the composition notes for product scope, while BS 970 (Part 1) 708A37 is commonly used for used for gears, shafts, studs, machine spindles, crankshafts, and automotive components.. SAE J404 4137 is defined under SAE International, originating from United States, while BS 970 (Part 1) 708A37 is defined under British Standards (BS), originating from United Kingdom.

As per chemical composition, SAE J404 4137 vs BS 970 (Part 1) 708A37 is a 89.6% match. Mechanical property data is not available for both grades, so this factor could not be scored. Combined, this makes them a strong match overall at 89.6%.

Frequently Compared With SAE J404 4137:
IS 1570 (Part 4) 10Mo6 IS 4367 07Cr4Mo6 IS 1570 (Part 4) 105Cr5 IS 11169 (Part 1) 10Ni5Cr4 IS 11169 (Part 1) 12Cr4Mo2 IS 1570 (Part 4) 103Cr4 IS 1570 (Part 4) 07Cr4Mo6 IS 1570 (Part 4) 103Cr6 NF A35-565 100C6 IS 1570 (Part 7) 10Cr36Mo10H IS 1570 (Part 7) 10Mo6H UNI 11234 100Cr6
Match Breakdown
CHEMISTRY MATCH
89.6%
MECHANICAL MATCH
No shared data
OVERALL
89.6%
Specifications
Property SAE J404 4137 BS 970 (Part 1) 708A37
Standard SAE J404:2009 BS 970 (Part 1):1983
Category Alloy Steel Alloy Steel
C (%) 0.35-0.40 0.35-0.40
Cr (%) 0.80-1.10 0.90-1.20
Mn (%) 0.70-0.90 0.70-0.90
Mo (%) 0.15-0.25 0.15-0.25
P (%) <=0.030 <=0.035
S (%) <=0.040 <=0.040
Si (%) 0.15-0.35 Not specified
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Typical Applications
SAE J404 4137
Chemistry-only alloy steel grade; see the composition notes for product scope
BS 970 (Part 1) 708A37
Used for gears, shafts, studs, machine spindles, crankshafts, and automotive components.
Key Differences
Can SAE J404 4137 Be Substituted With BS 970 (Part 1) 708A37?
SAE J404 4137 and BS 970 (Part 1) 708A37 overlap closely enough on chemistry and mechanical properties that BS 970 (Part 1) 708A37 is often considered as a substitute for SAE J404 4137 in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.
Forms & Sizes Available on M-EX
SAE J404 4137
No active listings currently.
BS 970 (Part 1) 708A37
Round Bar → (2 listings)
Diameter: 50–50 mm (1.97–1.97 in)
Length: 6700–7000 mm (263.78–275.59 in)
On M-EX Right Now
SAE J404 4137
0 active listings and RFQs →
BS 970 (Part 1) 708A37
2 active listings and RFQs →
Frequently Asked Questions
What is the difference between SAE J404 4137 and BS 970 (Part 1) 708A37?
SAE J404 4137 specifies Si which is not specified for BS 970 (Part 1) 708A37.
Can SAE J404 4137 be substituted with BS 970 (Part 1) 708A37?
SAE J404 4137 and BS 970 (Part 1) 708A37 overlap closely enough on chemistry and mechanical properties that BS 970 (Part 1) 708A37 is often considered as a substitute for SAE J404 4137 in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.