Oil Tempered Springs

Oil tempered wire, also known as ASTM A229, has excellent durability, fatigue, and resistance to relaxation. Oil-tempered wire is both cheaper and thicker, as well as has good shock resistance.

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Technical Specification Oil Tempered
Nominal Composition

C: 0.55 - 0.85

Mn: 0.30 – 1.2

Fe: 98.29


0.284 lb./in3

Modulus of Elasticity (E)

29 x 103 ksi

Modulus of Rigidity (G)

11.6 x 103 ksi

Electrical Resistivity

170 µΩ.cm

Thermal Conductivity

361 Btu/(hr/ft2/in/°F)

Min Size

0.020 in (0.500 mm)

Max Temp

150oC (300oF)


It can be used for applications that are exposed to constant loads such as garage door springs