Bright bars (cold finished) · Size & tolerance table

SAE and JIS carbon steel bar grades — equivalents and carbon ranges

Standard: SAE J403 · JIS G 4051 · EN 10083-2 / EN ISO 683-1

The plain carbon steels most bright and cold-drawn bars are made from. The SAE (AISI) number gives the carbon content in hundredths of a per cent — 1045 has about 0.45% — and the JIS name says the same thing: S45C.

The ranges below are the carbon and manganese limits of the grade standards. JIS grades also limit silicon (0.15–0.35%) and SAE grades phosphorus and sulphur; check the full composition in the standard you order to. Grades with the same nominal carbon are close, not identical, so state one standard on the order.

Carbon steel bar grades

SAE / AISI	C %	Mn %	JIS	C %	EN (nearest)
1010	0.08–0.13	0.30–0.60	S10C	0.08–0.13	C10
1015	0.13–0.18	0.30–0.60	S15C	0.13–0.18	C15
1020	0.18–0.23	0.30–0.60	S20C	0.18–0.23	C22
1025	0.22–0.28	0.30–0.60	S25C	0.22–0.28	C25
1030	0.28–0.34	0.60–0.90	S30C	0.27–0.33	C30
1035	0.32–0.38	0.60–0.90	S35C	0.32–0.38	C35
1040	0.37–0.44	0.60–0.90	S40C	0.37–0.43	C40
1045	0.43–0.50	0.60–0.90	S45C	0.42–0.48	C45
1050	0.48–0.55	0.60–0.90	S50C	0.47–0.53	C50
1055	0.50–0.60	0.60–0.90	S55C	0.52–0.58	C55

Notes

SAE 1018 (C 0.15–0.20%, Mn 0.60–0.90%) is the most common cold-drawn bar grade and has no exact JIS twin; S17C or S20C is usually offered.
For hardened and tempered parts, alloy grades such as 4140 (SCM440, 42CrMo4) are used instead — see alloy steel.