Extension Springs

Compression and extension springsAn Extension Spring resists a ‘pulling force’ exerted against it through energy stored. Normally made from round wire, the coils are ‘close-wound’, with some ‘initial tension’ included.

Many types of ‘hook’ formations are used to secure the spring in its application including full hooks, extended hooks, swivel hooks, and half hooks.

Marsh Springs manufacture a full range of extension springs, from small hearing aid and lock springs to large agricultural equipment springs.

The firm also has developed in-house a range of automated equipment to economically produce high volume runs (eg. trampoline springs).

Marsh Springs Unique Product Features

  • Spring wire diameters available from 0.25mm to 16mm
  • Full range of hook ends including extended and swivel types
  • Choice of hard-drawn, galvanised, 304 and 316 grade stainless-steel, and oil-tempered materials
  • Choice of protective finishes including painted, zinc-plated, and other anti-corrosive coatings
  • Cold coiled production method with oven-bake stress relief, strengthening process
  • Large and small production runs welcome

Quote Guide Diagram

For a spring quote, please submit contact details, and we shall come back to you promptly to discuss your requirements.

End Options


Key Measurements



Item Description
BL Body length
HG Hook gap
ID Inside diameter
MD Mean diameter
OD Outside diameter
LIE Length inside ends
WD Wire diameter