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ASTM A681 O2 vs SAE J404 4120

Related Material — 65% match based on chemical composition and mechanical property overlap.

ASTM A681 O2 (ASTM A681:2008) and SAE J404 4120 (SAE J404:2009) are both steel grades. ASTM A681 O2 is classified under Tool & Die Steels, while SAE J404 4120 is classified under Alloy Steel — a different category, which is worth noting alongside the chemistry match below. ASTM A681 O2 is typically used for taps, drills, reamers, punches, gauges, while SAE J404 4120 is commonly used for used for gears, crankshafts, studs, pins, machinery parts, and transmission components.. ASTM A681 O2 is defined under ASTM International, originating from United States, while SAE J404 4120 is defined under SAE International, originating from United States.

As per chemical composition, ASTM A681 O2 vs SAE J404 4120 is a 65.1% 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 65%.

Frequently Compared With ASTM A681 O2:
GOST 5950 4H5MFS DIN EN ISO 4957 1.2344 EN ISO 683-17 100Cr6 GB/T 1299 3Cr2W8V GOST 5950 3H2W8F GB/T 1299 4Cr5MoSiV EN ISO 4957 1.2316 GOST 5950 4H5MFS1 AISI 52100 DIN EN ISO 4957 1.2379 GB/T 1299 4Cr5MoSiV1 IS 1570 (Part 6) 50T8
Match Breakdown
CHEMISTRY MATCH
65.1%
MECHANICAL MATCH
No shared data
OVERALL
65%
Specifications
Property ASTM A681 O2 SAE J404 4120
Standard ASTM A681:2008 SAE J404:2009
Category Tool & Die Steels Alloy Steel
C (%) 0.85-0.95 0.18-0.23
Mn (%) 1.40-1.80 0.90-1.20
P (%) <=0.030 <=0.030
S (%) <=0.030 <=0.040
Si (%) <=0.50 0.15-0.35
Cr (%) <=0.50 0.40-0.60
V (%) <=0.30 Not specified
Mo (%) <=0.30 0.13-0.20
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Mechanical Properties
Property ASTM A681 O2 SAE J404 4120
Hardness <=217 HB Not specified
Condition Annealed (maximum Brinell hardness) Not specified
Typical Applications
ASTM A681 O2
Taps, drills, reamers, punches, gauges
SAE J404 4120
Used for gears, crankshafts, studs, pins, machinery parts, and transmission components.
Key Differences
Can ASTM A681 O2 Be Substituted With SAE J404 4120?
ASTM A681 O2 and SAE J404 4120 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
ASTM A681 O2
Round Bar → (6 listings)
Diameter: 40–60 mm (1.57–2.36 in)
Length: 600–5700 mm (23.62–224.41 in)
SAE J404 4120
Round Bar → (2 listings)
Diameter: 50–50 mm (1.97–1.97 in)
Length: 5800–6100 mm (228.35–240.16 in)
On M-EX Right Now
ASTM A681 O2
6 active listings and RFQs →
SAE J404 4120
2 active listings and RFQs →
Frequently Asked Questions
What is the difference between ASTM A681 O2 and SAE J404 4120?
Different category: ASTM A681 O2 is Tool & Die Steels, SAE J404 4120 is Alloy Steel. ASTM A681 O2 specifies V which is not specified for SAE J404 4120.
Can ASTM A681 O2 be substituted with SAE J404 4120?
ASTM A681 O2 and SAE J404 4120 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.