Steel Wires for Mechanical Spring – Oil Hardened & Tempered & Lead Patented

We are offering both oil-hardened and tempered, and lead patented steel wires for mechanical springs.

• Fine precision
• Superior surface quality
• Customizable

JIS G 3521 Hard drawn spring steel wire

Chemical Composition

0.2mm ~ 0.45mm

Wire Grade	C	Si	Mn	P	S
JIS G 3521 SWB	0.69-0.76	0.15-0.35	0.30-0.60	max0.030	max0.030
	0.79-0.86	0.15-0.35	0.60-0.90	max0.030	max0.030
JIS G 3522 SWC	0.69-0.76	0.15-0.35	0.30-0.60	max0.030	max0.030
	0.79-0.86	0.15-0.35	0.60-0.90	max0.030	max0.030
	0.79-0.86	0.15-0.35	0.30-0.90	max0.030	max0.030

Dimensional Tolerance

Diameter range	SWB SWC
	Tolerance	Roundness
0.15≤D≤0.20	＋0/-0.006	max0.003
0.20≤D≤0.50	＋0/-0.008	max0.004
0.50≤D≤0.60	＋0/-0.010	max0.005
0.60≤D≤1.00	+0.005/-0.010	max0.008
1.00≤D≤2.00	+0.005/-0.015	max0.010

Tensile Strength

JIS G3521 SWB/SWC
Diameter	N/mm2 Tensile Strength
	SWB	SWC
0.15	2210-2550	2550-2890
0.16	2210-2550	2550-2890
0.17	2210-2550	2500-2840
0.18	2210-2550	2500-2840
0.19	2210-2550	2500-2790
0.20	2210-2550	2500-2790
0.25	2110-2400	2400-2700
0.30	2010-2300	2300-2600
0.35	2010-2300	2300-2600
0.40	1960-2260	2260-2550
0.45	1910-2210	2210-2500
0.50	1910-2210	2210-2500
0.55	1860-2160	2160-2450
0.60	1860-2110	2110-2400
0.65	1810-2110	2110-2400
0.70	1770-2060	2060-2350
0.75	1770-2010	2010-2300
0.80	1770-2010	2010-2300
0.85	1770-2010	2010-2260
0.90	1770-2010	2010-2260
0.95	1720-1960	1960-2210
1.00	1720-1960	1960-2210
1.05	1670-1910	1960-2160
1.10	1670-1910	1910-2160
1.15	1670-1910	1910-2160
1.20	1670-1910	1910-2160
1.25	1620-1860	1860-2110
1.30	1620-1860	1860-2110
1.35	1620-1860	1860-2110
1.40	1620-1860	1860-2110
1.45	1570-1810	1810-2060
1.50	1570-1810	1810-2060
1.55	1570-1810	1810-2060
1.60	1570-1810	1810-2060
1.65	1520-1770	1770-2010
1.70	1520-1770	1770-2010
1.75	1520-1770	1770-2010
1.80	1520-1770	1770-2010
1.85	1470-1720	1720-1960
1.90	1470-1720	1720-1960
1.95	1470-1720	1720-1960
2.00	1470-1720	1720-1960

12/03/2021