Endlesss compres-
sion springs
157
Endless compression springs
formula unit
technical term
inquiry formula unit
technical term
inquiry
d
mm wire diameter
sn1
mm maximum spring deflection of one coil
D
mm mean coil diameter
R1
N/mm spring rate of one coil
De
mm outer coil diameter
S
mm pitch of spring, distance mid-wire to mid-wire
Fn
N
maximum force
n
pc.
number of active coils
L0
mm unstressed spring length
Patented drawn spring steel wire in compliance
with EN 10270 part 1 type DH for all wire
diameters up to 1.9 mm. For diameters between
2.0 and 12.0 mm type SH will be used (A228 / BS
5216). Our stainless steel springs are manufac-
tured using spring steel wire material no. 1.4310
in compliance with EN 10270 part 3 (A301 / BS
301S21). The tolerances of the wire diameters
comply with EN 10270.
The springs are right-hand coiled (clockwise). The
length of each spring is 1000 mm, and the end
coils are closed but not ground.
Endless compression springs are not thermally
treated. This allows a slight bending of the end
coils. The endless compression springs should
ultimately be thermally treated in order to obtain
fully operational compression springs from them.
Thermal coating 30 minutes at 300° C. Cool
down by air.
The maximum indicated load (Fn) is the load
which each particular spring of this size can
withstand, regardless of the number of coils. The
stated values for the deflection (sn1) and the
spring rate (R1) are the theoretical values for a
spring of the particular size which has 1 active coil
only. These values are for a spring in a relaxed,
horizontal position, and can therefore be used to
calculate the values for other springs. For springs
with a different number of coils R1 should be
divided by the number of active coils [R = R1 / n]
in order to obtain the correct spring rate. The
possible deflection can be determined by dividing
the maximum load by the spring rate [sn = Fn / R].
Material
Design
Thermal treatment
Loads
Data sheets at
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