Endless extension
springs
325
Endless extension springs
formula unit
technical term
inquiry formula unit
technical term
inquiry
d
mm wire diameter
Fn
N
maximum spring force
De
mm outer coil diameter
sn1
mm maximum spring deflection of one coil
Lk
mm length of relaxed spring body
R1
N/mm spring rate of one coil
F0
N
initial tension
n
pc.
number of active coils
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 10.0 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 endless extension springs are not thermally
treated, in order to allow the loops to be bent
accurately. The springs should be tempered
before being employed as extension springs.
Thermal coating 30 minutes at 240° C. Cool
down by air.
The springs are right-hand coiled (clockwise).
The length of each spring is 1000mm. The spring
bodies do not have any loops.
The indicated maximum load (Fn) is the
maximum load which that particular spring can
withstand. The stated spring rate (R1) applies to
the compression of one coil. If a spring has
several coils the spring rate can be calculated by
dividing (R1) by the number of active coils (n)
[R=R1/n]. The maximum extended length is
determined by multiplying the number of active
coils with the maximum extension of one coil
[sn=sn1· n].
Material
Thermal treatment
Design
Loads
Data sheets at
federnshop.com
