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Cargo Securement Basics: Tie-Downs, Working Load Limits, and the Rules

The federal cargo securement rules in 49 CFR Part 393 Subpart I: the performance standard, aggregate working load limit, the general tie-down minimums, and why commodity-specific rules override the general counts.

Shawn Gresham

CDL-A driver and instructor — 17 years driving, zero violations. Founder of Trucking Life with Shawn and the TLWS truck driving school in Dalton, Georgia.

Last updated July 17, 2026

✓ Last reviewed against the eCFR July 17, 2026

Quick answer: Cargo on a CMV must be secured under 49 CFR Part 393, Subpart I so it cannot leak, spill, blow, fall from, or shift on the vehicle (392.9 makes driving without that a violation). The system must meet the performance standard of 393.102 (holding against defined forward, rearward, and sideways forces), the aggregate working load limit of the tie-downs must be at least half the cargo weight (393.106(d)), general freight follows the tie-down minimums in 393.110 — and for listed commodities, the commodity-specific rules control, not the general counts.

Regulatory-change disclaimer: Last reviewed July 17, 2026 against the eCFR. Confirm the current Part 393, Subpart I — and your commodity's specific section — before relying on this. Not legal advice.

What the securement rules are

Subpart I is a layered system:

  • A performance standard (393.102): the securement must withstand deceleration in the forward direction and acceleration in the rearward and lateral directions at the g-values the section specifies — the physics target every method must hit.
  • General securement rules (393.104–393.114): proper devices in proper condition, blocking and bracing, front-end structures, and the tie-down mathematics below.
  • Commodity-specific rules (393.116–393.136): logs, dressed lumber, metal coils, paper rolls, concrete pipe, intermodal containers, vehicles-as-cargo, roll-on/roll-off containers, boulders, and heavy equipment each have their own section that supplements or replaces the general rules.

Why it matters

A shifted load steers the truck; a lost load becomes everyone's emergency. Securement violations are also inspection staples — visible in seconds at any Level I or II, with the serious ones sitting in the CVSA out-of-service criteria.

Who it applies to

Federal requirement: every CMV operator in interstate commerce — dry van freight included. Securement is not a flatbed specialty: 392.9's "secured and unshifting" duty applies to pallets in a box just as to coils on a deck, and the driver shares it personally.

The load math, step by step

  • Step 1 — know the cargo weight. Every rule below is computed from it.
  • Step 2 — working load limit (WLL). Each device's WLL comes from its marking or, unmarked, from the default tables in 393.108. A tie-down's rating is its weakest component's.
  • Step 3 — aggregate WLL. Sum the tie-downs per 393.106(d)'s counting method: the total must be at least 50% of the cargo weight.
  • Step 4 — minimum count for general freight (393.110): one tie-down for articles 5 ft or shorter and 1,100 lbs or lighter; two tie-downs for articles 5 ft or shorter and heavier than 1,100 lbs, or for articles longer than 5 ft up to 10 ft; and for longer articles, two plus one more for each additional 10 ft or fraction thereof. These minimums apply when the article is not blocked against forward movement; blocked cargo has its own line in the section.
  • Step 5 — commodity check. Hauling a listed commodity? Its section governs — general counts do not answer coil, log, or equipment questions. Read the specific rule or the FMCSA driver's handbook on cargo securement.
  • Step 6 — inspect en route. 392.9(b) requires examining the cargo and securement within the first 50 miles and re-examining at duty changes, and at intervals of 3 hours or 150 miles thereafter, whichever comes first (with the section's stated exceptions, such as sealed loads you've been ordered not to open).

Real-world example

Example (illustration, not legal advice): An 8-foot, 4,000-lb crate on a flatbed, not blocked forward. Length says two tie-downs minimum (over 5 ft, under 10 ft). Aggregate WLL must reach 2,000 lbs — two unmarked 3/8-inch chain assemblies rated per the 393.108 defaults would clear it, but check the actual table and the weakest component, not this sentence. Two straps that satisfy the count but sum under 2,000 lbs WLL fail the math; the count and the aggregate are separate tests and you must pass both.

Common mistakes

  • Counting straps but never summing WLL — or vice versa. Both requirements bind.
  • Rating a tie-down by its strongest part. Weakest component controls, and damaged devices (per the general rules) don't count at all.
  • Applying general counts to listed commodities. Coils are not crates; the commodity section controls.
  • Skipping the 50-mile check because the dock loaded it. 392.9 puts the en-route duty on the driver, sealed-load exceptions aside.
  • Dry-van complacency: unblocked, unbraced pallets that "always ride fine" — until the hard stop that 393.102's forward standard exists for.

Compliance risks

Securement violations feed the Vehicle Maintenance area of the SMS, the serious ones are out-of-service conditions under the CVSA criteria, and a lost-load crash makes the securement record the case's centerpiece. Every one of them is visible in a walk-around you can do first.

Driver checklist

  • Cargo weight known; devices inspected, marked or default-rated.
  • Aggregate WLL ≥ half the cargo weight — do the sum.
  • Minimum counts met per 393.110 (or the commodity section applied).
  • Blocking/bracing and front-end structure used as the rules require.
  • 50-mile check, then every 3 hours / 150 miles / duty change.

Keep learning

Frequently asked questions

How many tie-downs does a load legally need?

For general freight not blocked forward, 49 CFR 393.110 sets the minimums: one tie-down for articles up to 5 ft and 1,100 lbs; two for heavier short articles or articles 5–10 ft; and one more for each additional 10 ft or fraction beyond that. Listed commodities (coils, logs, equipment) follow their own sections instead — and the aggregate working load limit must separately reach half the cargo weight.

What is aggregate working load limit?

The sum of the tie-downs' working load limits counted per 49 CFR 393.106(d), which must be at least 50 percent of the cargo's weight. Each device's WLL comes from its marking or the default tables in 393.108, rated by its weakest component.

How often must a driver check cargo securement during a trip?

Under 49 CFR 392.9(b): within the first 50 miles, then at each duty-status change and at intervals of 3 hours or 150 miles, whichever comes first — with stated exceptions such as sealed loads the driver is ordered not to open.

Do cargo securement rules apply to dry vans?

Yes. 49 CFR 392.9 prohibits driving unless cargo is secured against shifting on or within the vehicle. Containment in a sided vehicle can itself satisfy 393.102 — but only when the walls are of adequate strength and each article is in contact with, or sufficiently close to, a wall or other cargo so it cannot shift or tip (393.102(c)(2)). Loose pallets with room to move are not secured.

Sources

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