Material:
Wire, Steel, Music in accordance with ASTM A228.
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Wire, Steel, Corrosion Resisting in accordance with ASTM A580 and ASTM A313.
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Protective coating:
Cadmium plating in accordance with QQ-P-416, Type II, Class 2.
Zinc coating in accordance with ASTM B633, Type II, Fe/Zn5.
Passivation treatment in accordance with QQ-P-35.
Ends:
Squared and ground.
Tolerances:
Outside diameter “OD”:
Ends to be square within 3 degrees with axis. (Grade B of procurement specification)
Spring rate “R” +/- 10%.
Wire diameter “d” in accordance with material specifications.
Deflection “F” +/- 10%.
Dimensions:
All dimensions are in inches.
Part Number:
The MS part number consists of the MS number, plus the dash number. Example:
MS24585-1.
.
Notes:
- The Part Identification Number (PIN) for MS24585D and the part number for SAE-AS24585
are identical.
- Free length “L”, active coils “N”, and deflection per coil “F” are for reference
use only.
- Load “P” must be attained at a compressed length determined by subtracting deflection
“F” (with tolerance) from the free length “L”. For corrosion-resisting steel multiply
“P” by .833.
- Spring values shown are for music wire and are based on a service life of 50,000
cycles at .50 stress range.
- To determine safe working deflection under other operating conditions, or when corrosion-resisting
steel is used, multiply “F” by the appropriate factor shown in the table below.
P1 = load at assembled length and P2 = final load.
- To determine load “P” at any deflection other than “F” multiply the proposed deflection
by the rate “R”.
- When steel, corrosion-resisting is used the value for rate “R” must be corrected
by multiplying “R” by .833.
- Music wire springs are not recommended for applications where temperature exceeds
250F. Corrosion-resisting steel springs are not recommended foe applications where
temperature exceeds 500F.
Table 1 - Correction Factor for stress range life cycles and spring material
