Underlift Tie Down Straps — What Every Operator Should Know

July 28, 2026

Underlift tie down straps are one of the most specific pieces of equipment on a tow truck — purpose-built for one job, with no good substitute. If you're running an underlift and using generic ratchet straps or wheel lift slings where underlift straps belong, you're either wearing out your gear faster than you should or creating a securement setup that isn't doing what you think it's doing.

This guide covers what underlift tie down straps are, how they work, how to size them for your unit and your load, and what to look for in protective sleeve construction — the feature that separates a quality underlift strap from one that wears out in a season.

What Underlift Tie Down Straps Do

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On a standard underlift or wheel lift configuration, the primary lift is handled by the underlift mechanism itself — the arms extend under the vehicle's axle or frame, the crossbar makes contact, and the hydraulics raise the front or rear of the vehicle off the ground. The vehicle then hangs partially suspended, rolling on the opposite axle.

The underlift tie down strap's job is secondary securement — preventing the lifted end of the vehicle from swinging, bouncing, or coming off the underlift during transport. The strap runs from the underlift arm or crossbar frame, wraps under or around the vehicle's axle housing or lower control arm area, and connects back to a fixed point on the lift — creating a closed loop that keeps the vehicle seated on the underlift regardless of road inputs.

Without underlift straps, the vehicle is held in position solely by the geometry of the lift contact points. Over a rough road, at speed, or during sudden lane changes, that contact can break — the vehicle can shift, bounce off the lift, or in a worst case, separate from the tow truck entirely. Underlift straps are what prevent that.

They're also a DOT securement requirement. Under 49 CFR 393.130, vehicles being transported must be immobilized and prevented from shifting in all directions. The underlift mechanism handles vertical — the straps handle the rest.

How They Differ from Standard Tie Down Straps

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Underlift tie down straps look similar to standard ratchet straps at a glance, but the differences are significant:

Length: Underlift straps are shorter than rollback deck straps. A standard rollback strap runs 14'–27' because it has to span from a deck anchor point to the vehicle and back. An underlift strap only needs to reach from the underlift arm around the axle housing and back to a connection point on the lift — typically 4'–8' of webbing is sufficient.

Protective sleeve: This is the defining feature of a proper underlift strap. The portion of the strap that contacts the underlift arm, crossbar, or frame runs against raw steel under load and vibration. Bare webbing against steel abrades rapidly — a strap without a sleeve in this application may fail within a season of regular use. A proper underlift strap has a heavy-duty sleeve — typically a rubber or reinforced synthetic tube — over the section of webbing that contacts the metal underlift components. The sleeve absorbs abrasion and protects the load-bearing webbing underneath.

Connection configuration: Standard rollback straps terminate in snap hooks or chain ends designed for deck slot connection. Underlift straps typically have flat hooks, grab hooks, or loop-back configurations designed to connect to the underlift arm's anchor points — which are different geometry than a deck rail slot.

No ratchet in some configurations: Some underlift strap designs use a cam buckle or fixed loop rather than a ratchet, because the strap needs to be set and released quickly at every job. A ratchet adds tensioning precision but slows down the setup and release cycle on high-volume tow operations.

Sizing Guide

Matching the strap to your underlift and your load range involves three variables: width, length, and WLL.

Width

1-3/4" webbing is the standard for light-duty underlift applications — passenger vehicles, light trucks, and standard SUVs on light-duty wheel lift units.

2" webbing is the standard for medium-duty applications — heavier pickups, full-size vans, and light commercial vehicles on medium-duty underlift units. The 2" medium-duty underlift tie-down with protective sleeve is the most common configuration in everyday towing and the right choice for the majority of operators running a medium-duty wrecker or integrated unit.

2-1/2" and wider configurations exist for heavy-duty underlift applications on larger units, but these are specialty items for heavy recovery operations rather than everyday light and medium-duty towing.

Length

Length is determined by your underlift unit's geometry — specifically, the distance from the underlift arm anchor point, around the vehicle axle housing, and back to the connection point on the opposite side. This varies by underlift manufacturer and model.

The practical approach: measure the route the strap needs to take on your unit with a tape measure, add 12"–18" for adjustment and connection, and that's your target strap length. Most medium-duty underlift straps run 6'–10' of webbing.

If you're buying for a new unit and don't have a measurement yet, 8' is a reasonable starting point for most medium-duty underlift configurations on wrecker and integrated units.

WLL

The strap's WLL must be appropriate for the load being secured. Under the FMCSA 50% rule (49 CFR 393.102), your aggregate securement WLL must equal at least 50% of the cargo weight — and for an underlift tow, the underlift straps are part of that aggregate.

For medium-duty underlift work on passenger vehicles and light trucks (3,000–8,000 lb vehicles), two underlift straps at 3,333 lb WLL each gives you 6,666 lbs of combined WLL from the straps alone — more than sufficient for any passenger vehicle.

For heavier vehicles, size up the strap WLL accordingly or add additional securement points.

Protective Sleeve Construction — What to Look For

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The sleeve is the most important component of an underlift strap from a longevity standpoint. Here's what separates quality sleeve construction from cheap alternatives:

Material: Heavy-duty rubber or reinforced synthetic (neoprene, PVC-coated nylon) sleeves outperform basic plastic tubing significantly. The sleeve needs to absorb abrasion under continuous vibration and compression — a thin plastic sleeve cracks and splits within a season. Rubber and reinforced synthetics flex with the webbing and maintain protective coverage under the loading cycles of daily tow work.

Coverage length: The sleeve needs to cover the entire section of webbing that contacts the underlift metal components — not just the peak contact point. A sleeve that's too short leaves webbing exposed at the edges of the contact zone, which is where abrasion damage actually starts.

Fit: The sleeve should fit snugly over the webbing without being so tight that it restricts the webbing's ability to flex. A loose sleeve migrates under load and leaves the webbing exposed; an overly tight sleeve can pinch and restrict the webbing.

Stitching and retention: Quality underlift straps have the sleeve secured at both ends — either stitched to the webbing cover or retained by the end fittings — so it can't slide off during use.

Compatibility with Common Underlift Brands

Underlift arm geometry, connection point location, and crossbar dimensions vary between manufacturers. The strap length and connection hardware that works on a Jerr-Dan may not fit a Century or Vulcan without adjustment. Here's what to know by brand:

Jerr-Dan: Jerr-Dan underlift units are among the most common in the field. Their arm configurations generally work well with standard medium-duty underlift straps in the 6'–10' range with flat hook or loop-back terminations. Jerr-Dan's own strap specifications are a useful reference for length when buying aftermarket.

Century (Miller Industries): Century underlift systems have similar arm geometry to Jerr-Dan in most medium-duty configurations. Standard medium-duty underlift straps fit without modification on most Century wheel lift and integrated units. Confirm the connection point type on your specific model — some Century configurations use a slot connection rather than a hook mount.

Vulcan (Miller Industries): Vulcan medium-duty units are built on similar platforms to Century. Strap sizing follows the same guidelines. The Vulcan 892 and similar integrated units are the most common in light/medium-duty fleet applications and work with standard medium-duty underlift strap configurations.

NRC: NRC underlift units — including the light and medium-duty integrated lines — use connection geometries consistent with industry standard underlift strap configurations. As an authorized NRC dealer, Battelini carries underlift straps that are specifically compatible with NRC unit specifications.

General guidance: When buying underlift straps for a specific unit, confirm the connection point type (hook slot, pin mount, or loop attachment), measure the strap route length on your unit, and match the webbing width to your unit's rated lift capacity class.

Inspection and Retirement

Underlift straps take more localized abuse than rollback deck straps because the load is concentrated at the sleeve contact point rather than distributed along a long strap run. Inspect before every use:

Sleeve:

Check for cracking, splitting, or deformation at the contact zone
Look for sleeve migration — if the sleeve has shifted off the contact area, the webbing underneath is now exposed
Any sleeve that has split open and is no longer protecting the webbing underneath is a retirement trigger for the strap

Webbing (visible sections outside the sleeve):

Cuts, fraying, or abrasion damage
Chemical contamination — fuel and oil are common in the underlift operating environment
UV degradation on straps stored exposed to sunlight

End fittings:

Hook or loop integrity — no bends, cracks, or deformation
If using a cam buckle, confirm the cam locks and holds under hand tension before putting the strap on a vehicle

WLL label:

Must be present and legible — same requirement as all tie down equipment under 49 CFR 393.104

Replace underlift straps more aggressively than rollback deck straps. The sleeve protects the webbing, but once the sleeve shows significant wear, the webbing underneath is next. Don't wait for webbing failure — replace when the sleeve shows serious deterioration.

Product at Battelini

Battelini Wrecker Sales carries the 2" Medium Duty Underlift Tie-Down with Protective Sleeve — the standard configuration for medium-duty wrecker, integrated, and wheel lift units operating on passenger vehicles and light-duty trucks.

This strap is built for the operating environment: reinforced polyester webbing, heavy-duty protective sleeve over the underlift contact section, and connection hardware sized for standard medium-duty underlift arm geometry. WLL labeled per DOT requirements.

If you need a different width, length, or connection configuration for your specific unit, contact us — we can source the right specification for your equipment.

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