Chain Binders, Shackles and Towing Accessories

Working load limit, chain grade and binder type

Securing a load comes down to the working load limit, or WLL, the most a component should carry in use. Chain is graded: grade 70 transport chain and grade 80 alloy chain differ in strength, and the chain, hooks and binder in one assembly should all be rated for the load, because the lowest-rated part sets the limit. Binder listings name the chain sizes they take, for example 5/16 to 3/8 inch or 3/8 to 1/2 inch.

A lever binder tightens by pulling a long handle, which is quick but needs strength and space to swing, and it stores energy that can snap back if released carelessly. A ratchet binder tightens in small steps with more control and less effort. Both need a hook that fits the chain link and a handle length that clears the load. Rules for commercial cargo set minimum combined working load limits, so check the requirements for your vehicle and cargo.

Shackles, hooks and what the ton rating really means

A D-ring or bow shackle joins chain, strap or rope to an anchor point. Size is the pin or bow diameter, such as 3/4 inch, and the pin type matters: a screw pin is quick to fit, while a bolt, nut and cotter pin stays secure under vibration or shock loads. Check whether a tonnage figure, such as 30 ton, is the working load or the breaking strength, which is several times higher; the working load is the number to plan with.

Winches and recovery gear use the same logic. A winch should be rated well above the vehicle's weight, with a line sized and rated for the pull, and the anchor points on the vehicle must be strong enough. Inspect chain, hooks and shackles before every use, and retire any that are stretched, bent, cracked or worn at the contact points.

Questions about Chain Binders, Shackles and Towing Accessories

What is the difference between grade 70 and grade 80 chain?

Grade 80 alloy chain is stronger than grade 70 transport chain for the same link size, so it carries a higher working load. Grade 70 is meant for tying down cargo, while grade 80 is also used for lifting when the whole assembly is rated for it.

Is the ton rating on a shackle the safe load?

Not always. Some listings show the working load limit, others show the breaking strength, which can be several times higher. Look for the WLL marking on the shackle and the stated working load in the description, and never exceed it.

What size binder do I need for my chain?

Match the binder to the chain size range printed in the listing, for example 5/16 to 3/8 inch or 3/8 to 1/2 inch. Then check that the binder's working load is at least equal to the chain's, because the weakest part of the assembly sets the limit.