Extension Springs exert pulling force

                 There are a wide variety of hook configurations. Some examples include:

 

                Key information needed to effectively design extension springs include:
 
                Environment
                Inside and outside diameter ranges
                Applied loads between two operating points
                Maximum extended length
                Type of ends
 
               Wire diameter range is from 0.004' to 0.625
 
Materials
Specification
Usage
Recommended Thickness Range (inches)
Music Wire
ATSM-A-228
AMS 5112
General usage for all springs requiring wiring less than 17 inches (4.32 mm) diameter.
Do not use where corrosion resistance is required or where shock or impact loads will be imposed at sub-zero temperatures.
 
.004-.17
(.10-4.32 mm)
9254
Oil Tempered
 
ASTM-S-401
 
Use for highly loaded spring. Not corrosion resistant. Susceptible to hydrogen embrittlement when plated. Avoid sustained applications.
 
.032-.44
(.81-11.18 mm)
 
 
302
Spring Temper
 
 
AMS 5688
ASTM-A-313
General usage corrosion resistant springs. Lower strength than 17-7 PH, condition CH900; but superior corrosion resistance.
 
.006-.38
    (.15-9.65 mm)
 
17-7 CRES
Condition C
 
AMS 5678
Use for springs required optimum resistance to 600F (316C). Precipitation hardened to CH900 after forming and coiling.
.016-.44
(.41-11.18 mm)
Inconel X-750
No. 1 Temper
 
AMS 5698
Use for springs required optimum resistance to relaxation in the 700F (371C) to 1000F (538C) range with low stresses.
.003 -.500
(.08-12.70 mm)
Inconel X-750
Spring Temper
AMS 5699
Used when high strength is required to about 700F (371C). Springs are precipitation hardened to about 1200F (639C) for four hours after coiling or forming. Spring temper material contains more cold work and has higher strength than material in the No. 1 temper condition.
.012-500
(.30-12.70 mm)
Copper Alloys
Alloy C26000
(Brass)
ASTM B-134
Alloy 62000
Spring Temper
Use were electrical conductivity is required. Non-magnetic. Use C26000 for low stresses and C51000 for high stresses.
.020-500
(.51-12.7 mm)
Phosphor
Bronze A
Alloy C51000
(Spring Temper)
ASTM-B-159
Alloy C51000
Spring Temper
Use were electrical conductivity is required. Non-magnetic. Use C26000 for low stresses and C51000 for high stresses.
.020-500
(.51-12.7 mm)
TI-3AI-8V-6C4-4Mo-4Zr
(Cold Worked)
AMS 4957
Use for general corrosion and stress corrosion resistant springs and where like weight is required. Springs are aged after coiling or forming.
NOTE: Savings up to 70% weight and 50% space can be realized by using titanium alloys.
.032-.625
(.81-15.88 mm)
TI-3AI-8V-6C4-4Mo-4Zr
(Hot Rolled)
AMS 4958
Use for general corrosion and stress corrosion resistant springs and where like weight is required. Springs are aged after coiling or forming.
NOTE: Savings up to 70% weight and 50% space can be realized by using titanium alloys.
.625+
(15.88+mm)

 

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