Mechanical Compression Springs

Belleville Springs

Belleville Springs

Extension Springs

Belleville Spring Washers

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Stock sizes in music wire and stainless steel
All SPEC stock helical extension springs have uniform body diameter and are produced with full twist loops the same diameter as the body. They are wound with initial tension; some force is required before coils are initially separated. As with other Associated Spring stock components, they are capable of wide application for experimental, development, prototype and maintenance work.

Music Wire - Per ASTM-A228 or AMS 5112. Music wire springs are not recommended for applications where the temperature exceeds 121 deg. C (250 deg F.)
Stainless Steel Type 302 - ASTM-A313 or AMS 5688 spring tempered (chemical & physical only). Stainless steel springs are not recommended for applications where the temperature exceeds 260 deg. C (500 deg. F).
Type 302 stainless steel is slightly magnetic. Surface of stainless steel may have a residue of nickel on the surface. This is normal and will not affect the function of the part.
Wire diameter is prior to forming.

Direction of Helix - Right or left according to machine set-up at time of run.

Full twist loop. Special ends on request.
Initial tension T is for reference only; free length dimension L is approximate
Maximum load P is attained at extended length L1.
To determine load P, rate R or initial tension T, for stainless steel, multiply the values given by 0.833. To determine load P* at any extension other than L1, multiply the distance in inches that the spring will be extended from the free length L, by the spring rate R and add the initial tension T.

Standard finish is that of the normal wire. Shot-peened and plated finishes furnished on request. Allow sufficient additional time for special finishes.


O.D. (English)
O.D. (Metric)
0.063 to 0.119 in 0.003 in
1.60 to 3.02 mm 0.08 mm
0.120 to 0.240 in 0.005 in
3.05 to 6.10 mm 0.13 mm
0.241 to 0.500 in 0.008 in
6.12 to 12.70 mm 0.20 mm
0.501 to 1.000 in 0.015 in
12.73 to 25.40 mm 0.38 mm
1.001 to 1.225 in 0.020 in
25.43 to 31.12 mm 0.51 mm
1.226 to 1.460 in 0.030 in
31.14 to 37.08 mm 0.76 mm
1.461 to 2.000 in 0.040 in
37.11 to 50.80 mm 1.02 mm

Load, P 10%
Spring Rate, R 10%
Position of Ends, the majority of parts are manufactured to 22 deg. If your application is critical, please contact our engineering department.

Please note that spring may take a set when extended beyond L1.
*P = (Lx - L) x R + T
Lx = Desired Load Length

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Extension Springs