Extension Springs

Our extension springs come in various sizes, and all color codes meet DASMA specifications, You will find double-looped ends standard on most with clipped-ends standard on 200-pound pulls or greater.

Extension Springs
Sizes available
25 x 42……………..7'Double-looped end standard; clipped-end standard on 200 lb pull or greater
27 x 48................. 8’Colour Codes meet DASMA specifications.
32 x 48................. 8’
36 x 54................. 9’
44 x 60................. 10’
53 x 72................. 12’

Specialty Springs

Specialty springs from Arrow Tru-Line come in several varieties with options for pusher springs, bumper springs, and more.

Specialty Springs


ATL offers spring component accessories including a rigid plastic spring filler in addition to a spring guard that upgrades homeowner safety.

Tubes (0.995 DIA)

Our torsion tubes measure 0.995 inches in diameter and come in several different lengths and gauges. The 16GA and 14GA tubes are galvanized while the 11GA is hot rolled.

Tubes (0.995 DIA)
Length16GA - Galvanized14GA - Galvanized11GA - Hot Rolled

Solid Shaft

Our solid shafts are available in 1” and 1 ¼” in various lengths. We also offer high quality shaft and tube couplers in addition to shaft collars.

Solid Shaft
3" Shaft Key - Straight
1" Bore Coupler
1-1/4" Bore Coupler
1" Shaft Collar
1-1/4" Shaft Collar

Torsion Springs

Torsion springs from Arrow Tru-Line come in several varieties depending on the wire size, spring diameter, and spring coatings.

Torsion Springs

Cast Steel Duplex Spring Fittings

Our cast steel duplex fittings come with various parts to ensure proper installation and reliable strength and security. Specifically, these products are an 80,000 PSI steel zinc plated casting.

  • 80,000 PSI Steel zinc plated casting
  • Wire size max = .468″ dia., min = .283 dia.
  • Spring diameters, Outer max. 6″, Inner min. 3-3/8″
  • Includes (4) 3/8″-16 x 1″ lg. hardened cup point set screws
  • Applicable bearing plate centerlines, 4-3/8″ , 5″, 6″, & 7-1/2″
  • For use on solid shaft (1″ bore) – max 30 ft lbs set screw torque
  • Includes the following : (8) eye bolts, (4) spacer links,
  • (8) 3/8″ hex nuts, (8) 3/8″ flat washers &
  • (1) 8 ga. Center bearing plate
  • Red head set screws (complies with DASMA 103)
Cast Steel Duplex Spring Fittings

Aluminum Duplex Spring Fittings

The aluminum duplex spring fittings we have available feature the multiple parts needed for a proper duplex spring fitting alongside a list of the required fasteners that are necessary for attachment.

Aluminum Duplex Spring Fittings
Assembled from standard 3-3/4" & 6" componentsRequires the following fasteners:
(1) each 3-3/4" short ear, 3-3/4" long ear stationary fittings(2) 3/8" - 16 x 1-1/2" hex head bolts
(1) each 6" stationary fitting and 6" winding fitting(2) 3/8" - 16 x 1-1/4" hex head bolts
Red head set screws (complies with DASMA 103)(4) 3/8" lock washers

Universal Spring Fittings

Universal spring fittings are designed to fit either a left or right wound spring. ATL supplies Universal fittings for 1-3/4”, 2”, 2-5/8”, and 3-3/4” inside diameter springs.

Universal Spring Fittings
Max. Wire Size DiameterSet Screw InstalledMounting
3-3/4"0.40623/8"-16x1-1/2" (2)1"tube or solid shaft - min. 1/2 turns on set screws
2-5/8"0.3313/8"-16x1" (2)1"tube or solid shaft - min. 1/2 turns on set screws
2"0.30653/8"-16x1" (2)1" tube or solid shaft
1-3/4"0.2953/8"-16x1" (2)1" tube or solid shaft

Single Thread Spring Fittings

Single thread spring fittings can only be used for the hand it was manufactured for. ATL supplies Single Thread fittings for 3-3/4” and 6” inside diameter springs.

Single Thread Spring Fittings
Max. Wire Size DiameterSet Screw InstalledMounting
6"0.43753/8"-16 x 2" (2)1" solid shaft - max. 30 ft. lbs. set screws torque
3-3/4"0.40623/8" - 16 x 1-1/2" (2)1" tube or solid shaft - min. 1/2 turns on set screws

Duplex Spring Bracket Assembly

Duplex spring bracket assemblies are used to mount duplex springs, and they are primarily used when the inner spring is longer than the outer spring. Our kit comes with a variety of pieces and is available with 1” or 1 ¼” bearings.

  • Mounting assembly for 6″ & 3-3/4″
  • Duplex Springs
  • Use when inner spring is longer than outer spring Kit as shown (includes bearings, spring anchor plates, and mounting fasteners)
  • Available with 1″ or 1-1/4″ bearings
Duplex Spring Bracket Assembly
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