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GB/T 8731 Y35 vs SAE J403 1118

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

GB/T 8731 Y35 (GB/T 8731-2025) and SAE J403 1118 (SAE J403:2009) are both steel grades. Both fall under the Free Machining Steel category. GB/T 8731 Y35 is typically used for used for screws, nuts, fittings, precision turned parts, bushings, and automatic lathe components., while SAE J403 1118 is commonly used for chemistry-only grade; product scope as listed in the composition notes. GB/T 8731 Y35 is defined under Guobiao Standards (GB/T), originating from China, while SAE J403 1118 is defined under SAE International, originating from United States.

As per chemical composition, GB/T 8731 Y35 vs SAE J403 1118 is a 72.4% 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 GB/T 8731 Y35:
SAE J403 1138 SAE J403 1138 SAE J403 1117 SAE J403 1137 SAE J403 1138 SAE J403 1117 SAE J403 1118 SAE J403 1126 SAE J403 1117 SAE J403 1118 IS 1570 (Part 3) 10C8S10 IS 4432 10C8S10
Match Breakdown
CHEMISTRY MATCH
72.4%
MECHANICAL MATCH
No shared data
OVERALL
69.9%
Specifications
Property GB/T 8731 Y35 SAE J403 1118
Standard GB/T 8731-2025 SAE J403:2009
Category Free Machining Steel Free Machining Steel
C (%) 0.32-0.39 0.14-0.20
Si (%) 0.15 max Not specified
Mn (%) 0.70-1.00 1.30-1.60
S (%) 0.20-0.35 0.08-0.13
P (%) 0.07-0.12 <=0.030
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Mechanical Properties
Property GB/T 8731 Y35 SAE J403 1118
Tensile Strength 520-680 MPa Not specified
Yield Strength 315-420 MPa Not specified
Elongation 10-16% Not specified
Hardness 140-190 HB Not specified
Typical Applications
GB/T 8731 Y35
Used for screws, nuts, fittings, precision turned parts, bushings, and automatic lathe components.
SAE J403 1118
Chemistry-only grade; product scope as listed in the composition notes
Key Differences
Can GB/T 8731 Y35 Be Substituted With SAE J403 1118?
GB/T 8731 Y35 and SAE J403 1118 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
GB/T 8731 Y35
Hex Bar → (2 listings)
Across Flats: 25–25 mm (0.98–0.98 in)
Length: 2900–3700 mm (114.17–145.67 in)
SAE J403 1118
No active listings currently.
On M-EX Right Now
GB/T 8731 Y35
2 active listings and RFQs →
SAE J403 1118
0 active listings and RFQs →
Frequently Asked Questions
What is the difference between GB/T 8731 Y35 and SAE J403 1118?
GB/T 8731 Y35 specifies Si which is not specified for SAE J403 1118.
Can GB/T 8731 Y35 be substituted with SAE J403 1118?
GB/T 8731 Y35 and SAE J403 1118 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.