Lorry straps — also called truck tie-down straps, cargo lashing straps, or load securing straps — are the collective term for polyester webbing hardware systems used to secure loads on lorries, flatbed trailers, box vans, and other haulage vehicles. The industry uses multiple interchangeable names for these products, with subcategories defined by their tensioning mechanisms: ratchet, cam buckle, and over-center buckle. All certified lorry straps use high-tenacity polyester webbing chosen for its low elongation and stable tensile performance, which prevents cargo shifting during highway transit and sudden braking events.
Key Takeaways
- “Lorry straps” is the universal collective term; interchangeable aliases include truck tie-down straps, cargo lashing straps, ratchet lashing straps, and load bundling straps.
- Choose straps based on cargo weight, vehicle type, and road conditions. All securement must comply with EN 12195-2 (EU/UK) or FMCSA 49 CFR Part 393 (US) regulations, which specify minimum force resistance thresholds for forward, lateral, and rearward load movement.
- Ratchet straps deliver high tension and high Working Load Limit (WLL) for heavy industrial cargo; cam buckle straps provide lower tension suited to light, fragile goods requiring frequent loading and unloading cycles.
- Perform a full visual inspection of webbing and metal hardware before every use: check for cuts, abrasion, chemical damage, UV degradation, and corrosion. Any damaged strap must be removed from service immediately — there is no acceptable level of wear for safety-critical securement.
- Only use certified straps permanently labeled with WLL and MBS ratings. Standardized industry terminology simplifies communication between buyers, fleet operators, and suppliers, reducing procurement errors.
- Understand the difference between WLL (Working Load Limit) and MBS (Minimum Break Strength): WLL is typically 1/3 of MBS and represents the maximum safe working load — never exceed it.
Before every journey, conduct a hands-on pre-trip check: run your fingers along the full length of the webbing to feel for cuts or stiff spots, verify the ratchet mechanism locks and releases smoothly, and confirm all end fittings are free of bending or corrosion. A 60-second inspection can prevent a catastrophic load failure on the motorway.
Main Names for Lorry Straps
Ratchet Straps
A gear-driven ratchet crank generates controllable high tension — typically up to several thousand daN depending on webbing width — making ratchet straps the primary choice for heavy freight transport over long distances. The ratchet mechanism locks cargo against vibration, sudden braking, and uneven road surfaces because the gear pawl prevents tension release once engaged. Widespread adoption across flatbed fleets, machinery haulers, and vehicle transporters reflects the ratchet strap’s ability to maintain constant locked tension throughout multi-hour highway transits where load shift could be catastrophic.
Cam Buckle Straps (Lashing Straps)
Cam buckle straps employ a spring-loaded cam mechanism that clamps the webbing when the lever is pressed down, which offers rapid operation at the cost of lower clamping force compared with ratchet assemblies. These straps are best suited to light cargo (typically under 340 kg / 750 lb WLL) and short-haul transport of fragile goods — such as furniture, appliances, or packaged retail pallets — where over-tensioning would crush the load. However, cam buckles may lose grip progressively when subjected to sustained vibration on rough roads, so drivers should recheck tension at every stop on longer routes.
Over-Centre Buckle Straps
An over-centre buckle design uses an offset lever that crosses a mechanical centre point to self-lock once engaged, which produces uniform tension across the webbing without requiring continuous handle cranking. The integrated mechanism minimises post-installation tension loss, giving these straps a practical advantage on multi-drop delivery routes where frequent re-tensioning would otherwise slow operations.
Choosing and Identifying Straps
How to Choose the Right Strap
Selecting the correct lorry strap requires the operator to evaluate three interdependent variables: cargo weight, anticipated dynamic forces during transit, and the strap’s certified Lashing Capacity (LC). The process begins not with the strap but with the load — EN 12195-1 defines acceleration coefficients (forward 0.8 g, lateral 0.5 g, rearward 0.5 g for road transport) that translate cargo weight into required restraint force, which then determines the minimum aggregate WLL of the lashing assembly.
How to Verify a Strap Label
Every EN 12195-2-compliant lorry strap must carry a permanently affixed, legible label containing the following fields: manufacturer name or trademark, Lashing Capacity (LC) in daN, material code (e.g. PES for polyester), webbing width in mm, elongation at LC (must be ≤7%), year of manufacture, and a traceability batch code. The label must remain readable throughout the strap’s service life — if it becomes illegible or missing, the strap must be withdrawn from service regardless of apparent physical condition, per DVSA roadside enforcement guidance.
WLL / LC / MBS / BS — Four Critical Concepts
| Term | Definition | Regulatory Reference |
|---|---|---|
| WLL (Working Load Limit) | The maximum mass a strap is rated to secure in service. In EN 12195-2 terminology, WLL is synonymous with LC (Lashing Capacity) — it is NOT the strap’s breaking point but the safe working ceiling. | EN 12195-2 §4.2 |
| LC (Lashing Capacity) | The EN 12195-2 term for WLL, expressed in daN. LC = the force the strap can sustain in a straight pull without exceeding elongation limits. This is the figure that must appear on the label. | EN 12195-2 §4.2 |
| MBS (Minimum Breaking Strength) | The force at which the strap assembly will fail. MBS is strictly a manufacturing quality metric — it is NOT a working limit and must never be used as a selection criterion. | EN 12195-2 §4.3 |
| BS (Breaking Strength) | The measured peak force at failure for an individual strap sample. MBS is the manufacturer’s guaranteed minimum across production; BS is the actual per-sample test result. | EN 12195-2 §4.3 |
Key distinction: WLL/LC is typically 1/2 to 1/3 of MBS, depending on the safety factor chosen by the manufacturer. Using MBS as a working limit — a common operator error — means the strap is being loaded to near failure with zero safety margin.
Selection Decision Table
| Criterion | Guidance |
|---|---|
| Aggregate WLL | Sum of all strap WLLs must ≥ 50% of cargo weight (FMCSA) or meet EN 12195-1 force calculations |
| Webbing Width | 1″ for light loads ≤500 lb; 2″ for standard commercial; 3–4″ for heavy industrial |
| Tension Mechanism | Ratchet for heavy/long-haul; cam buckle for light/fragile/short-haul; over-centre for medium multi-stop |
| End Fittings | Must match vehicle anchor type (D-ring, E-track, side rail) and be rated to at least the strap WLL |
| Label Presence | No legible EN 12195-2 label = do not use (DVSA) |
FAQ
What’s the difference between WLL, MBS, and LC on a strap label?
WLL (Working Load Limit) and LC (Lashing Capacity) are the same concept under EN 12195-2 — the maximum force the strap is rated to sustain in service, expressed in daN. MBS (Minimum Breaking Strength) is the guaranteed minimum force at which the strap will fail, typically 2–3 times higher than WLL. A strap’s MBS must never be used as a working limit; doing so loads the strap to near failure with zero safety margin. If a label shows only MBS without WLL/LC, the strap is not EN 12195-2 compliant.
How to check if truck tie-down straps are safe?
Perform a systematic pre-use inspection covering six checkpoints: legible EN 12195-2 label (manufacturer, LC, material code, traceability batch), webbing free from cuts and abrasion exposing core yarns, no chemical staining or stiffness, intact stitching with high-visibility thread, metal hardware free from cracks or deformation, and hook throat openings within manufacturer tolerance. Any strap failing any checkpoint must be tagged and removed from service immediately. Do not rely on generic marks such as CE or ISO 9001 — these are not cargo securement certifications.
Why are polyester webbing used to make truck tie-down straps?
Polyester is mandated for lorry straps by EN 12195-2 because it is the only commonly available synthetic fibre that combines low elongation under load (≤7% at WLL), full wet-strength retention, and sufficient UV resistance for outdoor transport use. Nylon, the closest alternative, stretches 20–25% under load — enough to allow cargo to slide during emergency braking — and loses approximately 10–15% of its strength when wet, making it unsuitable for road cargo securement under UK and EU regulations. Polyester’s dimensional stability across the −20°C to +60°C temperature range encountered during road transport further solidifies its position as the mandatory webbing material for certified lashings.
