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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.
Material
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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.) |
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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). |
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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. |
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Wire diameter is prior
to forming. |
Direction of Helix - Right or left according to machine
set-up at time of run.
Ends
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Full twist loop. Special
ends on request. |
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Initial tension T is for
reference only; free length dimension L is approximate |
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Maximum load P is attained
at extended length L1. |
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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.
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Finishes
Standard finish is that of the normal wire. Shot-peened and
plated finishes furnished on request. Allow sufficient additional
time for special finishes.
Tolerances
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O.D. (English)
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O.D. (Metric)
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0.063 to 0.119 in ± 0.003 in
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1.60 to 3.02 mm ± 0.08 mm
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0.120 to 0.240 in ± 0.005 in
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3.05 to 6.10 mm ± 0.13 mm
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0.241 to 0.500 in ± 0.008 in
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6.12 to 12.70 mm ± 0.20 mm
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0.501 to 1.000 in ± 0.015 in
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12.73 to 25.40 mm ± 0.38 mm
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1.001 to 1.225 in ± 0.020 in
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25.43 to 31.12 mm ± 0.51 mm
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1.226 to 1.460 in ± 0.030 in
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31.14 to 37.08 mm ± 0.76 mm
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1.461 to 2.000 in ± 0.040 in
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37.11 to 50.80 mm ± 1.02 mm
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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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Here to order this product
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