The Torsion Spring Stocking Guide For Door Pros

Smart inventory turns jobs faster, reduces returns, and protects your margins. This guide shows how to build a compact torsion spring lineup that covers most residential calls while keeping cash flow healthy.

The 80 percent approach

Most residential jobs fall into a small cluster of specs. A practical stocking plan focuses on the combinations that installers see day to day, then fills gaps with quick-ship items.

Core variables to track

• Inside diameter: 1.75 in and 2.00 in are the most common for residential doors.
• Wire size: typical gauges include .207, .2187, .2253, .234, .243, .250.
• Length: 23 to 32 inches covers many 7 ft and 8 ft doors.
• Wind: right wind and left wind. Always stock both.
• Cycle rating: standard 10k cycles, plus an upgrade lane at 20k or more for premium quotes.

Pro tip: verify label data against the door tag and measure 20 coils for wire size confirmation when replacing unknown springs.

A practical starter set

Use this as a starting grid, then tune to your service mix and local door brands.

Inside diameter 1.75 in

• Wire .207, lengths 25, 27, 29 in
• Wire .2187, lengths 25, 27, 29 in
• Wire .2253, lengths 25, 27, 29 in

Inside diameter 2.00 in

• Wire .234, lengths 27, 29, 31 in
• Wire .243, lengths 27, 29, 31 in
• Wire .250, lengths 27, 29, 31 in

Stock both winds for each line above. This compact matrix gives solid coverage for common double and single car doors without overextending inventory. Add long-cycle variants for your top three movers to offer a good, better, best option on every ticket.

Browse the current lineup and replenishment options on the SGD Springs catalog.

Ordering correctly the first time

A clean spec saves drive time and returns.

1. Measure wire size
   Count 20 coils and measure the length. Convert to wire gauge using your shop chart.
2. Confirm inside diameter
   Check the cone stamp or measure the spring ID. 1.75 or 2.00 are typical.
3. Measure relaxed length
   Measure the spring off tension, end to end, excluding cones unless your catalog specifies otherwise.
4. Identify wind
   From the end of the spring, if the last coil rises to the right it is right wind. If it rises to the left it is left wind.
5. Note door height and weight
   Use this info to validate turns and confirm you are within safe IPPT range for the opener and hardware.

For safety standards and technical definitions, see the International Door Association and DASMA resources for reference. Outbound: IDA and DASMA.

Cycle upgrades that sell themselves

Offer a higher cycle spring when the door sees heavy daily use or when noise and balance have been chronic issues. The price delta is usually modest compared with the labor and truck roll saved over time. Present it as a lifecycle value option, not a luxury.

Labeling, storage, and FIFO

• Label clearly: ID, wire, length, wind, and cycle rating on the box face and spine.
• Pair by winds: bin R and L side by side to reduce mismatches.
• Control climate: cool, dry storage prevents surface corrosion that can shorten life.
• FIFO rotation: first in, first out to keep packaging crisp and specs current.

Fast swaps with confidence

On site, check balance at half lift after winding. A properly matched pair should hold at mid travel with light assist only. If the door creeps or slams, recheck wire size and turns before calling the job complete.

Work with a supplier that understands service work

SGD Springs ships quickly, maintains deep coverage on popular residential specs, and supports pros with friendly technical help. Need a custom cut or a bulk stocking plan for multiple branches? We will build a replenishment schedule that fits your seasonality.

• Visit SGD Springs for current inventory and orders.
• Prefer to talk it through? (888) 803-3313

 

SGD Springs
1416 Westway Circle, Carrollton, TX 75006
(888) 803-3313
sgdsprings.com