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UNI 7845 C45 vs SAE J403 1045

Strong Match — 89.1% match based on chemical composition and mechanical property overlap.

UNI 7845 C45 (UNI 7845:1978) and SAE J403 1045 (SAE J403:2009) are both steel grades. Both fall under the Carbon Steel category. UNI 7845 C45 is typically used for shafts,axles,gears,studs,bolts,spindles,rollers,general engineering components, while SAE J403 1045 is commonly used for chemistry-only grade; product scope as listed in the composition notes. UNI 7845 C45 is defined under Ente Nazionale Italiano di Unificazione (UNI), originating from Italy, while SAE J403 1045 is defined under SAE International, originating from United States.

As per chemical composition, UNI 7845 C45 vs SAE J403 1045 is a 89.1% 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 89.1%.

Frequently Compared With UNI 7845 C45:
BS 970 (Part 3) 070M55 BS 970 (Part 1) 040A10 BS 970 (Part 1) 045A10 BS 970 (Part 3) 045A10 BS 970 (Part 1) 040A04 BS 970 (Part 1) 045A10 BS 970 (Part 1) 045M10 BS 970 (Part 1) 045M10 BS 970 (Part 1) 040A12 BS 970 (Part 3) 045M10 BS 970 (Part 1) 055M15 BS 970 (Part 1) 060A32
Match Breakdown
CHEMISTRY MATCH
89.1%
MECHANICAL MATCH
No shared data
OVERALL
89.1%
Specifications
Property UNI 7845 C45 SAE J403 1045
Standard UNI 7845:1978 SAE J403:2009
Category Carbon Steel Carbon Steel
C (%) 0.42-0.50 0.43-0.50
Si (%) 0.15-0.40 Not specified
Mn (%) 0.50-0.80 0.60-0.90
P (%) <=0.045 <=0.030
S (%) <=0.045 <=0.050
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Mechanical Properties
Property UNI 7845 C45 SAE J403 1045
Tensile Strength 620-800 MPa Not specified
Yield Strength 340-490 MPa Not specified
Elongation 14-20 % Not specified
Hardness 179-235 HB Not specified
Typical Applications
UNI 7845 C45
shafts,axles,gears,studs,bolts,spindles,rollers,general engineering components
SAE J403 1045
Chemistry-only grade; product scope as listed in the composition notes
Key Differences
Can UNI 7845 C45 Be Substituted With SAE J403 1045?
UNI 7845 C45 and SAE J403 1045 overlap closely enough on chemistry and mechanical properties that SAE J403 1045 is often considered as a substitute for UNI 7845 C45 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
UNI 7845 C45
Round Bar → (2 listings)
Diameter: 40–40 mm (1.57–1.57 in)
Length: 5500–6600 mm (216.54–259.84 in)
SAE J403 1045
No active listings currently.
On M-EX Right Now
UNI 7845 C45
2 active listings and RFQs →
SAE J403 1045
0 active listings and RFQs →
Frequently Asked Questions
What is the difference between UNI 7845 C45 and SAE J403 1045?
UNI 7845 C45 specifies Si which is not specified for SAE J403 1045.
Can UNI 7845 C45 be substituted with SAE J403 1045?
UNI 7845 C45 and SAE J403 1045 overlap closely enough on chemistry and mechanical properties that SAE J403 1045 is often considered as a substitute for UNI 7845 C45 in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.