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Draw bar springs in stainless spring steel

Tech Drawing - Draw bar springs in stainless spring steel

Order Monday-Thursday before 15:30 and Friday before 14:45 and we’ll dispatch your order the same day with expected delivery within 2-4 days. This applies to all stocked draw bar springs.

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What is a draw bar spring?
 

A draw bar spring consists of one compression spring and two brackets. With one bracket at each end, the compression spring converts to an extension spring. The brackets are stronger than the regular loops on extension springs. Draw bar springs are most often used in connection with mooring boats.

A draw bar spring is also sometimes called a boat spring.

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Shopping Options
d - Wire diameter (mm)
De - External diameter (mm)
L0 - Unloaded length (mm)
Ln - Max. loaded length (mm)
Sn - Maximum travel (mm)
Fn - Maximum load at Ln (N)
R - Spring constant (N/mm)
db - Wire loops (mm)

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View prices - Add to Cart Material d
Wire diameter (mm)
De
External diameter (mm)
L0
Unloaded length (mm)
Ln
Max. loaded length (mm)
Sn
Maximum travel (mm)
Fn
Maximum load at Ln (N)
R
Spring constant (N/mm)
db
Wire loops (mm)
SKU Stock Tech Drawing Read More 3D CAD
Stainless steel 302 1.00 7.30 40.00 49.60 9.60 39.60 4.11 1.00 BF-10980 BF-10980
Stainless steel 302 1.00 7.30 50.00 64.00 14.00 39.20 2.79 1.00 BF-10981 BF-10981
Stainless steel 302 1.00 7.30 60.00 75.40 15.40 23.90 1.55 1.00 BF-10982 BF-10982
Stainless steel 302 1.60 14.10 80.00 114.00 3.40 117.00 3.45 1.60 BF-10983 BF-10983
Stainless steel 302 1.60 14.10 100.00 150.00 50.00 119.00 2.34 1.60 BF-10984 BF-10984
Stainless steel 302 1.60 14.10 125.00 201.00 76.00 121.00 1.58 1.60 BF-10985 BF-10985
Stainless steel 302 2.00 22.00 150.00 218.00 68.00 141.00 2.05 2.00 BF-10986 BF-10986
Stainless steel 302 2.00 22.00 175.00 275.00 100.00 140.00 1.40 2.00 BF-10987 BF-10987
Stainless steel 302 2.00 22.00 200.00 306.00 106.00 119.00 1.12 2.00 BF-10988 BF-10988
Stainless steel 302 2.00 22.00 225.00 375.00 150.00 141.00 0.94 2.00 BF-10989 BF-10989

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Material

Stainless steel:
DIN 17224 AISI 302 WERKSTOFF NR. 1.4310 EN Norm 10270-3
Working temperature between -200 ºC and +250 ºC

Terminology
Technical Information - Draw bar springs in stainless spring steel
d
=
Wire in mm (spring)
db
=
Wire in mm (bracket)
De
=
External diameter in mm
Bi
=
Internal diameter bracket
Lh
=
Bracket height internal
R
=
Spring force N/mm
L0
=
Unloaded total length measured internal in brackets
Ln
=
Max. loaded length
sn
=
Max. Travel
Fn
=
Max. Force
1 N
=
0,10197 Kg
1 kg
=
9,80665 N
Service life of springs

The service life of a spring is generally very difficult to define. A large number of parameters come into play, and it is therefore impossible to define a service life.

Parameters with a significant influence on service life include: Installation, installation method, number of movements, vibrations, shocks, torsion, length of travel, non-axial travel, temperature, wear against other surfaces, environment of use, any cleaning agents, lateral impacts, etc.

Applying the maximum load to the spring or exceeding it will shorten its service life and may cause it to become permanently distorted.

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