Grade 30 Proof Coil Chain

Frequently Asked Questions

What is the difference between torsion and extension garage door cables?

Torsion cables work with torsion spring systems, wrapping around a cable drum mounted on the torsion shaft and attaching to a bottom bracket on the door. Extension cables work with extension spring systems and run along the horizontal tracks. The two types are not interchangeable, as cable length, assembly style, and end fittings differ between systems. Fehr Bros is a garage door cable supplier offering assemblies for both.

Why are cables sold in pairs?

Both cables on a door wear at the same rate. If one cable shows signs of fraying or fatigue, the other is typically close behind. Replacing both at the same time keeps the door balanced and avoids a second service call.

What cable diameter should I order?

The correct diameter depends on the door’s weight and the spring system in use. Common sizes are 3/32″, 1/8″, and 5/32″. Heavier doors typically require a larger diameter. If you are unsure of the correct specification, Fehr Bros product specialists can assist you in identifying the right cable for the application.

What is the difference between 7×7 and 7×19 cable construction?

Both constructions are used in garage door applications. The 7×7 cable consists of seven strands of seven wires each and is a common, durable choice for standard residential and light commercial doors. The 7×19 cable consists of seven strands of nineteen wires each. It is more flexible, which can be an advantage in applications where the cable travels around tighter bends or pulleys. Fehr Bros offers both constructions across torsion and extension cable assemblies.

Are Fehr Bros cable assemblies hot-dip galvanized?

Yes. Fehr Bros garage door cable assemblies use hot-dip galvanized (HDG) cable. In the HDG process, individual wires are dipped in a molten zinc bath before being formed into the finished cable. This produces a zinc coating significantly thicker than what electro-galvanized cable provides, resulting in greater corrosion and abrasion resistance over the life of the cable.

How do I determine the correct cable length for a door?

Cable length is determined by door height and lift type. For standard-lift torsion doors, the cable length is typically the door height plus 18 inches. Vertical-lift and high-lift configurations require longer cables. Fehr Bros organizes cable assemblies by door height to simplify selection. If your application falls outside standard sizing, contact a product specialist to discuss options.

Can I order cables for non-standard or taller door heights?

Yes. In addition to 7 ft and 8 ft door cables, Fehr Bros carries assemblies for taller doors in both torsion and extension configurations. These are listed separately in the catalog. For custom lengths or specifications outside the standard range, contact Fehr Bros to submit an RFQ.

How do I access pricing and place a wholesale order?

Pricing is available to registered B2B account holders. Log in to the Fehr Bros web store to view pricing and place orders. To set up an account, create a Fehr Bros account, or contact a product specialist for assistance.