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Tension (Extension) Springs

Tension (Extension) Springs

Tension springs are made from different qualities of wire and are tightly coiled. The spring stretches when bearing force. The ends are formed into hooks for easy assembly into the target product. The springs are usually made in round, cylindrical sections while the hooks can be round, half-round, U- or V-shaped or square.

Application: Auto parts springs, sports equipment springs, lamp springs, curtain hardware, jewelry springs, pump springs
Production range: material wire diameter 0.1mm (0.0039") ~ 8.0mm (0.315")
Common Spring Material Preferred Wire Diameters

TYPE OF EXTENSION SPRING ENDS

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Common Spring Material

Swipe Left To Know More
Material Symbol JIS NO. Applications
Normal
use		 Well-
conductive		 Corrosion-
resistant		 Heat-
resistant		 Fatigue-
resistant
Spring Steel SUP JIS G 4801 O        
Hard Drawn Wire SWB
SWC		 JIS G 3521 O        
Music Wire SWP-A
SWP-B		 JIS G 3522 O       O
Stainless Steel Wire SUS-304 JIS G 4314 O   O O  
SUS-316     O O  
SUS-631 J1     O O O
Nickel-plated Steel Wire SW-ND-C JIS G 4314   O      
Phosphor Bronze Wires C5191W-H JIS H 3270   O      
Oil Tempered Chromium Silicon Alloy Steel SWOSC-V JIS G 3561       O O
Oil Tempered Wire for Mechanical Springs SWOSC-B JIS G 3560 O       O
Carbon Tool Steel SK JIS G 4401 O        
Carbon Steels for Machine Structural Use S-C JIS G 4501 O        
Berylliumery Wire C1720W-H JIS H 3270   O O O O
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Preferred Wire Diameters (Metric size)

Material size
(mm)		 SWC
Hard Drawn wire		 SWP
Music wire		 SUS-304
Stainless steel wire		 SW-ND-C
Nickel-plated
Steel wire
8.00
O   O  
7.00 O   O  
6.50 O O O  
6.00 O O O  
5.50 O O O  
5.00 O O O  
4.50
O O O  
4.20 O O O  
4.00
O O O  
3.80
O O O  
3.50 O O O  
3.20 O O O  
3.00 O O O  
2.80 O O O  
2.60 O O O  
2.50 O O O  
2.40 O O O  
2.30
O O O  
2.20 O O O  
2.00 O O O  
1.80 O O O  
1.70 O O O  
1.60 O O O  
1.50 O O O  
1.40 O O O  
1.30 O O O  
1.20 O O O O
1.10 O O O  
1.00 O O O O
0.90 O O O O
0.85 O O O  
0.80 O O O O
0.75 O O O  
0.70
O O O O
0.65 O O O O
0.60 O O O O
0.55 O O O O
0.50 O O O O
0.45 O O O O
0.40 O O O O
0.38 O O O  
0.35 O O O O
0.32 O O O  
0.30 O O O O
0.28 O O O  
0.26 O O O  
0.25 O O O  
0.23 O O O  
0.21 O O O  
0.20 O O O  
0.18   O O  
0.16   O O  
0.15   O O  
0.14   O O  
0.13   O O  
0.12   O O  
0.11   O O  
0.10   O O  
×