Equipment / Securement
Chains and Binders in trucking
Plain-English explanation
Chains and binders are the primary heavy-freight securement method for flatbed loads that require more tensioning force than straps can safely provide. Chains are grade 70 or grade 80 alloy steel chain; binders are the tensioning devices — either lever binders (over-center) or ratchet binders — that pull the chain tight once it is positioned over or around the cargo. FMCSA cargo securement regulations (49 CFR Part 393 Subpart I) specify minimum aggregate working load limit (WLL) for securement based on cargo weight. Grade 70 transport chain (which has yellow-chromate links) meets common requirements for agricultural and construction equipment. Grade 80 is heavier and used for heavier or more demanding applications. Chain is used for cargo where straps would cut, burn, or not provide adequate hold: - Steel coils and pipe (where sharp edges would cut webbing straps) - Heavy machinery and equipment (where the weight exceeds strap WLL) - Structural steel and beams - Concrete blocks and aggregate equipment Ratchet binders are safer than lever binders for most applications. Lever binders (also called "snap binders") work with an over-center locking mechanism that can release suddenly if the load shifts — the lever whips with significant force, which is a common cause of serious hand and arm injuries. Ratchet binders tension incrementally and lock at each click. Chains require inspection: check for twisted links, cracked welds, or wear beyond 10% of original link dimension before each use.
Equipment terms are best read physically: what is on the tractor, what trailer is assigned, how the freight loads, and what the driver can inspect before rolling.
Why it matters in trucking
Chains and binders are load-specific equipment that require knowledge of WLL calculations, inspection criteria, and safe handling procedures. An improperly secured flatbed load is a road hazard and a serious liability. The physical safety hazard of lever binder whip is a real injury risk that experienced flatbed operators take seriously.
The right equipment term helps prevent the wrong truck from being sent to pickup, especially for reefer, flatbed, liftgate, power-only, or drop-trailer work.
Example in real use
A flatbed driver loads a 38,000-pound excavator. They use four Grade 70 chains with ratchet binders — two chains over the front frame and two over the rear, each crossed to prevent lateral shift. They calculate the aggregate WLL of the four chains (4 × 6,600 lbs WLL per chain = 26,400 lbs) against the securement requirement (one-half the cargo weight forward = 19,000 lbs; lateral and rear = 19,000 lbs each). They add two more chains to meet the total forward requirement. Before pulling out, they walk the load at 25 miles and re-tension any chains that have loosened.
Where it shows up
Chains and binders show up on open-deck loads, machinery, steel, and other freight that needs heavy securement.
What to check first
- Working load limit and number of tie-downs.
- Anchor point strength and securement angles.
- Binders tightened and handles secured.
- Recheck after the load settles.
Common mistakes or confusion
- Using lever binders without understanding the whip hazard — when a lever binder slips or releases under tension, the handle can strike with enough force to break bones; ratchet binders eliminate this specific hazard.
- Not re-checking chain tension after the first 25 miles — chains settle and vibrate loose during the initial miles; a first re-tension stop is standard practice on properly run flatbed loads.
- Underestimating the number of chains required by calculating only gross weight without applying the directional requirements — forward, lateral, and rear securement each have their own WLL minimums.
Related terms
Related guides
Truck Parts and Equipment Terms is the best next place to keep learning this topic.
Sources and last updated
Last updated: 2026-05-09