Flat Lifting Strap

Flat lifting strap — heavy workpiece webbing strap to EN 1492-1, 1 t to 10 t, single ply to heavy builds, endless or eye-to-eye, any length from 1 m to 12 m

What is on this page. This page covers the flat lifting strap as a heavy workpiece product: what it is and what the words around it mean, the range and the build, how the ends are terminated and what the anchor terms actually refer to, the workpiece duties it is bought for, how to size it, when to choose a strap rather than a round sling or a chain, how it is inspected and retired, and how to order it.

• What a flat lifting strap is, and the words that get confused with it — section 1
• The range and the build: band, ply and width — section 2
• How the strap is terminated: eye, ring, buckle, and what the anchor terms mean — section 3
• Lifting heavy workpieces: what the strap actually has to do — section 4
• Sizing the strap from the weight, the hitch and the surface — section 5
• Strap, round sling or chain: choosing the sling for the load — section 6
• Inspection and retirement criteria — section 7
• Marking, standards and what a flat strap is not rated for — section 8
• How to order: the checklist — section 9
• The questions we are asked most often — section 10

1. What a Flat Lifting Strap Is

A flat lifting strap is a flat woven webbing sling: a wide band of man-made fibre woven flat, sewn into a reinforced eye at each end, closed into a continuous loop, or built as an assembly with end fittings. EN 1492-1 — the European standard for these products — covers flat woven webbing slings made of polyamide, polyester or polypropylene across webbing widths of 25 mm to 450 mm, in single and multi-ply construction, and sets out the requirements for design, testing and marking. The straps on this page are that product at a 7:1 safety factor, built for heavy workpiece duty.

Strap, sling and belt: in this trade they are the same thing. All three words are used interchangeably for this product, and a quotation may use any of them without meaning anything different. We still qualify the terms we use, because outside the trade they are not the same: strap is also used for a load restraint or tensioning strap, which is a different product, rated to a different regime and often tensioned by a ratchet rather than used to lift. If a quotation says only strap, ask two questions: what is it rated to, and under which standard.

Why a flat band rather than a chain, on a heavy workpiece. This is the central engineering point of the page, and it is a question of pressure rather than of strength. A chain of the same capacity carries its load on the very small area where the links touch the workpiece, so it marks a machined face, dents a casting and prints a witness line on anything painted or polished. The same load carried by a wide flat band is spread across the full width of the webbing, and the pressure on the surface falls in proportion. That is why finished, machined and coated work is usually rigged with a strap, and why the width of the band is a specification figure rather than a detail — it is the number that decides whether the load is marked.

What a flat strap is not. Three products sit close to it and are routinely quoted as if they were the same:

Terminology: what the words in the quotation actually mean

2. The Range and the Build: Band, Ply and Width

The band works the same way across the flat woven range, because it is set by the standard rather than by the application. What a heavy workpiece strap adds is build: where a general purpose strap reaches a band on one thickness of webbing, a heavy strap reaches it on more plies, which is how the heavier bands are made without an unusable width.

Flat lifting strap: band specification, 1 t to 10 t

Single ply, double ply and heavier builds. Ply is how many thicknesses of webbing are stacked in the body of the strap. Published European product data maps the progression directly: single ply for the lighter and middle capacities, double ply through the working range, and four plies for the heaviest flat webbing slings. Ply is a construction figure and not a rating — a 5 t strap is a 5 t strap in either ply — but it changes four things that matter on a heavy workpiece:

• Weight and handling. More plies make a heavier, stiffer strap. On work where riggers position the sling by hand many times a shift, that is a real cost.
• Width. Ply is how a heavy band is reached without an unwieldy width. Where the load tolerates a wide band, one or two plies at a wide width may be the better answer; where the rig is tight, more plies at a narrower width.
• Bearing pressure. More plies and more width spread the load and lower the pressure on the workpiece — which is the whole point on machined and painted surfaces.
• The bulk at the end. A multi-ply eye is a thicker eye in the same hook opening, so confirm that the hook or shackle still fits the eye before ordering the heavier build.

Which fibre, and what follows from it. A flat lifting strap is built in polyester, polyamide or polypropylene, and the fibre decides four things the band does not. The temperature range for use and storage under EN 1492-1 is −40 °C to +100 °C for polyester and polyamide but only −40 °C to +80 °C for polypropylene. The stretch under load is lowest in polyester. The wet behaviour differs: polyamide loses up to 15% of its dry rating while wet, while polypropylene takes up below 0.1% of its own weight in water and does not derate at all. And the chemistry differs, because polyester is attacked by alkalis and polyamide by acids, while polypropylene is unaffected by both. Tell us the environment and we will name the fibre rather than assume it.

3. How the Strap Is Terminated: Eye, Ring, Buckle, and What the Anchor Terms Mean

This section exists because the page's subject includes three phrases that buyers search for and that the trade uses loosely. Rather than invent a definition for them, here is what the terminations actually are, what each is for, and how to specify one without using an ambiguous word.

Termination options on a flat lifting strap

How to specify a termination without ambiguity. Describe what the end has to do: what will enter it (a hook, a shackle pin, a ring, another sling), the direction the load pulls out of it, and how much room the rig gives. From those three answers the eye form, the eye length and any fitting follow. That is the conversation, and it does not need either party to agree a definition of anchor eye.

Fittings have their own limits, and on this product they matter. A metal fitting in the load path is not automatically the strongest part of the rig: it is a component with its own material behaviour. Two published facts worth knowing before a fitting is chosen:

• Aluminium is severely degraded by alkali, caustic environments, acids and salt water. Manufacturer data says so directly, and the US sling rule separately prohibits aluminium fittings where caustics are present.
• High-strength alloy fittings are susceptible to hydrogen embrittlement in acidic conditions. Published industrial guidance is consistent on this and keeps those grades out of pickling and galvanising lines, which is why the strength of the fitting is not the only selection criterion.
• Where the environment is unknown, a soft eye has nothing to corrode. It is worth saying plainly: on some duties the safest specification is the one with no metal in it at all.

4. Lifting Heavy Workpieces: What the Strap Actually Has to Do

Heavy workpiece lifting is not one task but several, and they ask different things of the strap. The table below is organised by the load, because that is how the enquiry arrives and because the load decides two of the three constraints before the weight is even considered.

Heavy workpiece duties and what each one asks of a flat lifting strap

The three constraints, in the order they should be considered. Weight is only the first of them, and on finished work it is rarely the binding one.

• Weight. This sets the band, once the hitch is applied. It is arithmetic and it is the part everybody does.
• The surface. This sets the width and the protection. A strap that is strong enough but too narrow will still scrap the part, and on machined, painted and polished work that is the whole risk of the lift.
• The edges and the curvature. This sets the protection and sometimes the hitch. Published guidance lists diameter of curvature among the things the rated load is based on, and it is explicit that slings must be protected in configurations with sharp angles.

5. Sizing the Strap from the Weight, the Hitch and the Surface

What each hitch does to the rating of a flat lifting strap

Five rules that decide a heavy workpiece strap.

• Count the hitch before the weight. A 5 t strap choked is a 4 t strap. On heavy workpieces the choke is the normal hitch rather than the exception, so apply the 0.8 before choosing the band, not after.
• An assembly is never the sum of its straps. Two legs are 1.4 and four are 2.1, because a four-leg assembly is rated as if only three legs carry the load.
• Off-centre is the most under-estimated case in the shop. Dies, moulds and machine tools rarely have their centre of gravity where the drawing suggests. Two pick points and a load a third of the way towards one of them means 67% on that strap.
• Curvature is part of the rating, not a detail. A wide band wrapped round a thin plate edge or a small roll is not doing the same job as the same band in a straight lift. The answer is more bearing area, a different hitch or protection — not a heavier band.
• Width is how you protect the load. On finished work the band is often set by what the surface will take rather than by the weight, and a wider band at the same band rating is frequently the correct answer.

6. Strap, Round Sling or Chain: Choosing the Sling for the Load

A flat strap is the right answer for most heavy workpiece duty, but not for all of it. The comparison below is the one worth having before the order, because the wrong family is more expensive than the wrong band.

Flat strap against round sling and chain, on the things that decide heavy lifts

The practical rule. If the surface matters, the strap wins. If the weight is very high and the rig is tight, a round sling is often the better answer and it will reach bands a flat strap cannot. If the load is rough, sharp, hot or unknown, a chain is doing the job it was designed for. Where a lift has two of those properties at once — a heavy die with a sharp edge and a finished face, for example — the answer is usually a strap with protection rather than a heavier strap.

7. Inspection and Retirement Criteria

Every strap should be inspected before every use, with a documented periodic inspection on top of that. On heavy workpiece duty the wear is concentrated in three places — the eyes or fittings, the contact patch where the band bears on the load, and the stitching — so the inspection should follow the load path rather than scan the band.

Flat lifting strap: what to check, following the load path, and when to withdraw

Care rules for a flat lifting strap.

• Never exceed the band on the label, and never exceed it on the hitch the label does not describe — apply 0.8 for a choke, 1.4 or 2.1 for an assembly, and up to 67% onto one strap when the load is off-centre.
• Protect every edge, every time, at any load. Not for the strap's sake alone: a cut edge marks the load as well.
• Do not drag a strap over the floor, over plate edges or over machining swarf, and never pull a strap out from under a load resting on it.
• Do not twist, knot, shorten or lengthen a strap, and never repair one — the stitch at the eye in particular cannot be repaired.
• Keep restraint straps out of the rig and keep lifting straps out of load restraint duty. A strap that has been tensioned over a truck load has been loaded in a way no lifting rating covers.
• Clean and dry before storage, and store off the floor away from oil, chemicals, solvent vapour, heat and sharp edges.
• Rotate the loop or alternate the ends so that wear and the contact patch keep moving rather than collecting in one place.
• Inspect fittings as components, not as accessories — corrosion, pitting and deformation are reasons to withdraw, not to clean and re-use.
• Put the strap into a documented inspection programme as well as the pre-use check, especially where the load or the environment is severe.
• Cut a retired strap through before disposal so that it cannot be put back into service by mistake.

8. Marking, Standards and What a Flat Strap Is Not Rated For

What the product is built to. The straps on this page are made to EN 1492-1, Textile slings — Safety — Flat woven webbing slings made of man-made fibres for general purpose use, which covers single-leg, two-leg, three-leg, four-leg and endless sewn flat woven webbing slings with or without fittings, in polyamide, polyester or polypropylene, across webbing widths of 25 mm to 450 mm, at a 7:1 safety factor.

What every flat lifting strap has to carry, and why

The same product under two rulebooks

Duties a flat lifting strap is not rated for, at any band.

• Lifting or suspending a person.
• Towing, recovery or vehicle pulling — the rating is a lifting rating and tow loads are shock loads.
• Load restraint, lashing or cargo securing — that is what a restraint strap is for, and the two must not be substituted.
• Staying in place permanently as a tie, guy or restraint.
• Being knotted or twisted to shorten it, or being loaded through a buckle or fitting that is not part of the rated assembly.
• Lifting over an unprotected sharp edge without a sleeve.
• Use of a bare ring, eyebolt or other hardware as a lifting point on its own — that is hardware, rated and inspected as hardware.
• Working on or near live electrical conductors, or in service above the fibre's temperature ceiling.

9. How to Order: The Checklist

The order checklist for a flat lifting strap

10. Frequently Asked Questions

Contact us — flat lifting straps direct from the manufacturer

Tell us the load, the pick points and what the surface will take, and we will come back with the specification and price for your flat lifting strap: band, fibre, ply, width, end form, length and basis, protection and marking all on one sheet, with the fitting material called out if the strap is to be an assembly. We build to order in single ply, double ply and heavier builds, in polypropylene, polyester or polyamide, endless or eye-to-eye, in any length from 1 m to 12 m and beyond, with the EN 1492-1 colour code, the black capacity stripe count and a legible identification label as standard, protective sleeves and wear pads on request, and matching sets for two-leg and four-leg assemblies. Volume discounts apply.

• Contact: Wang Lili
• Phone: 18066002268
• E-mail: 702461526@qq.com
• Address: Lifute Industrial Park, Taizhou City, Jiangsu Province, China
• Send an enquiry >>