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Flat Lifting Sling

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Lift sling rigging company produce Flat Lifting Sling.

Flat lifting slings — flat woven webbing slings to EN 1492-1 in polyester, nylon or polypropylene, 1–30 t, eye and eye or endless, 1 m to 12 m.

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Lift sling rigging company produce Flat Lifting Sling.

Flat Lifting Sling

Flat Woven Webbing Slings to EN 1492-1 — Polyester, Nylon or Polypropylene, 1–30 t, Eye and Eye or Endless

A flat lifting sling is defined by one thing and one thing only: its cross-section. The load-bearing element is a band of woven webbing with a rectangular section, so it bears on the load across a broad, flat face rather than a line. That single property is what everything else follows from — a flat band lies against a flat face and does not concentrate the load, it wraps a section without creasing, it needs no fittings because its ends can be formed from the webbing itself, and it can be coiled, folded and carried by one person at capacities where a steel sling would need two. “Flat” says nothing about the fibre, the ends or the capacity; those are three separate decisions, and this page takes them in turn. Get the cross-section right and you have chosen the family. Get the fibre wrong and you will still fail — heat, acid, alkali and shock are what actually destroy a flat sling, and each fibre answers a different one.

  • Broad, flat bearing — spreads the load over a face instead of a line
  • No fittings on the load path — the ends are formed from the webbing itself
  • Three fibres, three duties — polyester, nylon and polypropylene answer different hazards
  • Light and safe to handle — a fraction of the weight of the steel it replaces

Blue flat woven webbing lifting sling with a stitched eye at each end and black capacity stripes
Blue flat woven webbing lifting sling with a stitched eye at each end and black capacity stripes
A flat lifting sling in the eye and eye form — a flat band with a formed eye at each end.

Close-up of the formed and stitched eye at the end of a blue flat woven webbing lifting sling
Close-up of the formed and stitched eye at the end of a blue flat woven webbing lifting sling
The formed eye — webbing folded back and closed with dense rows of stitching.

Key Features

A Face, Not a Line

A flat band spreads the load across its whole width. That is why a flat sling will pick up a crate, a machine base or a section and leave it unmarked where a wire rope would cut in.

Ends Made From the Webbing

There is no hardware on the load path. The webbing is folded back on itself and stitched, so nothing can be lost, seized or distorted — and the construction sits on the outside, where it can be inspected.

Soft Against the Load

Woven webbing conforms instead of biting. Painted, coated, polished and powder-coated surfaces survive a flat sling that a chain or wire rope would mark.

Light, and Kind to Your Crew

A flat sling of a given capacity weighs a fraction of the steel it replaces, and a shock load is not stored in it and released back into the lift.

Will Not Rust, Will Not Rot

Synthetic webbing is unaffected by water and does not corrode or support rot or mildew, which is why flat slings dominate yards, ports and wash-down environments.

Non-Conductive

With no metal in the load path, a flat sling does not conduct — an advantage anywhere near live plant or overhead lines.

What “Flat Lifting Sling” Covers — and What It Does Not

Buyers reach this family through several words, and the words do not mean the same thing. Sorting them out takes a minute and saves a wrong order.

The word What it actually names What it leaves open
Flat lifting sling The cross-section — a band with a rectangular section The fibre, the ends and the capacity
Webbing sling / flat woven sling The same article, named after the material it is woven from Everything above
Strap / belt / band The webbing itself, as a material with a width and a weave Whether it is rated for lifting at all — a strap is a material, not a specification
Nylon sling / polyester sling The fibre The section, the ends and the capacity
Round sling A different family — a parallel fibre core in a tubular sleeve Not a flat sling at all, whatever colour the sleeve is
What this page covers: the flat woven webbing sling family — every article in it whose load-bearing element is a rectangular band, in any fibre, with any end arrangement, at any capacity. If your load is round, tightly curved or so shaped that a flat band cannot lie flat against it, the answer is probably a round sling rather than a flat one, and it is worth checking before you specify.
One naming trap worth knowing before you order. In flat sling catalogues the words buckle and double buckle almost never mean a metal buckle. They mean an end formed by folding the webbing back on itself and stitching it — the same construction as any other formed eye. Buyers who read “double buckle” as hardware and order accordingly are the most common misreading in the whole family. If your quotation says buckle, ask which it is before the goods ship.

The Three Types You Can Buy

The cross-section is fixed by the family. What varies is how the article is finished — and that decides how the load enters it, and therefore what you can and cannot do with it.

Type What it is The load enters at Choose it for
Eye and eye A flat band with a formed, folded and stitched eye at each end Two defined points, one at each end Any lift where the pick-up points must be known and repeated, and where a defined length is part of the method
Endless (circular) flat sling The same flat band, closed into a continuous loop with no ends and no eyes Wherever the band happens to bear, and through the loop itself Choked lifts, bundles, and any job where one sling has to serve several different rigs — the loop can also be turned to move the wear
Sleeved or padded Either of the above with an extra protective layer at the bearing areas As above, but through a sacrificial layer Coated or finished loads, abrasive loads, and any bearing point where the webbing must not touch the load directly

Comparison of a blue eye and eye flat webbing sling above and an endless flat webbing sling below
Comparison of a blue eye and eye flat webbing sling above and an endless flat webbing sling below
Two forms of the same flat band: eye and eye above, closed into an endless loop below.
The choice in one line. If you need to state where the sling attaches, take eye and eye — two fixed points, a known length, and a construction you can inspect from the outside. If your crews rig whatever is in front of them, take endless — no ends to line up, four rigs from one article, and a loop you can rotate so the wear spreads instead of concentrating.

Choosing the Fibre — Polyester, Nylon or Polypropylene

This is the decision that actually decides whether your sling survives, and it is the one buyers most often make by accident. The three fibres look much the same in a photograph, carry the same capacity ladder and are distinguished on the article only by the colour of the sewn label. They behave very differently against heat, acid, alkali, shock and stretch.

Fibre is identified by label colour, not by the colour of the webbing — the webbing colour certifies the capacity band instead. Temperature figures are typical values for the standard grades; confirm the exact figure for the grade you are buying against the batch certificate.
Fibre Label colour Typical temperature range Stretch Chemicals Choose it when
Polyester (PES) Blue −40 °C to +100 °C Low — around 3% at the working load limit Good against most acids; attacked by strong alkalis The general-purpose answer, and the default. Lowest stretch for its strength, best all-round value, and the fibre most of the standard capacity ladder is published in.
Polyamide / nylon (PA) Green Typically to about +90 °C High — it stretches further before it breaks Attacked by acids; better than polyester against alkalis Shock loading, and where the load must be caught rather than held rigidly. It gives where polyester would pass the load straight on. Also the better choice in very cold conditions.
Polypropylene (PP) Brown Typically to about +80 °C Moderate Good against both acids and alkalis Chemical and coating environments. It is the lightest of the three and it floats, which makes it the fibre of choice for wet and chemical duty — and for the large-tonnage white belts used on coated products.
The short version. Polyester unless you have a reason. Nylon if something will shock-load the sling or if it must stretch. Polypropylene if the environment is wet, chemical, or both — and remember that a sling destroyed by acid is destroyed silently, from the inside, long before anything is visible on the outside.

Capacity, Colour, Width and Ply — Reading the Ladder

Under EN 1492-1 the colour of the webbing certifies the capacity band, in straight lift, and nothing else. Alongside it the band carries one black transverse stripe per tonne, so the two markings can be cross-checked against each other.

Our published ladder for the flat family runs 1, 2, 3, 4, 5, 8, 10 and 30 t, with the reference widths shown. The final width and the ordering lead time are stated on the order acknowledgement. Above about 30 t the sleeved round form normally takes over, because at that size a flat band becomes difficult to handle.
WLL (straight lift) Webbing colour Black stripes Reference width Choked (× 0.8) MBL at 7:1
1 t Violet 1 Confirm 0.8 t 7 t
2 t Green 2 50 mm 1.6 t 14 t
3 t Yellow 3 75 mm 2.4 t 21 t
4 t Grey 4 100 mm 3.2 t 28 t
5 t Red 5 125 mm 4.0 t 35 t
6 t Brown 6 150 mm 4.8 t 42 t
8 t Blue 8 200 mm 6.4 t 56 t
10 t Orange 10 250 mm 8.0 t 70 t
30 t No colour code 30 Confirm 24.0 t 210 t

Above 10 t the colour no longer identifies the sling, so the working load limit printed on the sewn label governs. Read the label, not the colour.

Width and ply — why two slings of the same capacity are not the same sling

Two flat slings can carry exactly the same working load limit and still be different articles, because the same capacity can be built at different widths and in different numbers of layers.

  • Width decides the bearing area. A wider band spreads the same load over more of the load’s surface, which matters wherever the surface must not be marked.
  • Ply decides stiffness and edge tolerance. A single-layer band is lighter and more flexible; a duplex or double-layer band is stiffer, sits flatter under a load, and lasts longer where the band runs over an edge.
  • Thickness matters in the hook. A very thick band occupies more of the hook bowl, which can limit how many slings you can gather onto one hook.
So when you compare two quotations for “a 5 t flat sling”, compare the width, the ply and the fibre as well as the price. A 5 t band at one width in single ply is not the same article as a 5 t band in double ply, and the difference is exactly the difference between a sling that lasts a season and one that lasts three.

The Formed Eye — Where the Load Enters

On a flat sling with ends, the load enters at the eyes. The webbing is folded back on itself and closed with several dense parallel rows of stitching, and that fold is the one place in the whole article where the load passes through a made connection rather than through continuous weave.

  • The construction sits on the outside. That is the flat sling’s quiet advantage over a sleeved round sling: everything that carries the load — the weave and the stitches — is on the surface, where you can see it.
  • The eyes are fixed wear points. Unlike an endless loop, an eye and eye sling always wears at the same two places — the eyes and the two bearing points. When they wear out, the sling is spent even if the rest of the band is sound.
  • Protect the eye at the hook. A rough hook bowl or an undersized hook will abrade the eye far faster than the load will. Check the hook as well as the sling.
  • Reinforced eyes are available where the same eyes are repeatedly hooked or the hook bowl is rough.

Blue flat woven webbing lifting sling passing over a forged crane hook with both parts seated in the hook bowl
Blue flat woven webbing lifting sling passing over a forged crane hook with both parts seated in the hook bowl
The sling over the hook — no shackle, no fitting, and the band lies flat because the band is flat.

Hitches and Mode Factors

The label figure is the straight lift rating. Every other hitch is derived from it by a mode factor.

Hitch or mode Mode factor M What it means
Straight lift 1.0 The label figure. Both parts of the sling hang to the hook.
Choked 0.8 The band passes round the load and back through itself so it grips as it takes the weight.
Basket, 0–7° 2.0 The band passes under the load with both legs on the hook, legs within 7° of vertical.
Basket, 7–45° 1.4 As the legs open out, the tension in each rises and the usable capacity falls.
Basket, 45–60° 1.0 At this spread the basket gives no more than a straight lift.
Angled choke at 45° 0.7 Choked, and the legs then open away from vertical. A choke placed straight onto the hook keeps 0.8.
Angled choke at 60° 0.5 The most heavily reduced arrangement in common use — check it before the lift, not after.
The calculation that catches most buyers. These factors reduce the rated figure. A 4 t load in a choker needs a 5 t sling, because 4 ÷ 0.8 = 5. Most “the sling was too small” incidents are not a failure of the sling at all — they are this division done the wrong way round at the quotation stage.

Two flat-specific habits, neither of which applies to a round sling: keep the band flat and untwisted in the hitch, because a flat band twisted into a rope concentrates the load on one edge and loses the contact area that is its whole advantage; and protect the band at edges, because on a sheared or machined edge a flat sling fails at the edge long before it fails at the load.

Technical Specifications and How to Specify

Standard range — capacity, fibre, width, ply, ends and marking are all produced to order.
Product name Flat lifting sling / flat webbing sling / flat woven webbing sling / webbing lifting sling
Type Flat woven webbing sling to EN 1492-1; eye and eye or endless (circular) form
Fibre Polyester (blue label) as standard; polyamide / nylon (green label); polypropylene (brown label)
Working load limit 1 t to 30 t in the published ladder, and intermediate capacities to order
Safety factor 7:1 to EN 1492-1 as standard; 5:1 to ASME B30.9 and 8:1 to AS 1353 built to order
Ply Single layer as standard; duplex and double layer on request
Width Matched to the capacity and the load surface — the reference series is 2 t = 50 mm, 3 t = 75 mm, 4 t = 100 mm, 5 t = 125 mm, 6 t = 150 mm, 8 t = 200 mm, 10 t = 250 mm; final width on the order acknowledgement
Length Manufactured to order; state the length between the bearing points of the eyes, or the length that suits your rig
Elongation Maximum 3% at the working load limit for polyester; maximum 10% at the breaking load
Temperature range −40 °C to +100 °C for the standard polyester build; nylon and polypropylene differ — see the fibre table
Protection Protective sleeves, wear pads, edge protectors and reinforced eyes on request
Marking EN 1492-1 capacity colour with one black stripe per tonne; sewn label carrying the straight-lift WLL, the fibre, the standard reference, the manufacturer, the length and a traceability code
Testing Batch tested; test certificate supplied per batch on request
MOQ & OEM Low MOQ for trial orders; full OEM — capacity, fibre, width, ply, ends, colour, label layout and packing

How to specify one — in this order

  1. The load, and its shape. The shape decides whether a flat band can lie against it at all, or whether you need a round section instead.
  2. The hitch you will actually rig. Not the one in the method statement — the one the crew will use. Then apply the mode factor and size the capacity from that figure.
  3. The environment. Heat, acid, alkali, water, grit. This decides the fibre, and getting it wrong is the failure you will not see coming.
  4. The surface. Whether the load may be marked decides the width and whether you need a sleeve or a pad.
  5. The ends. Eye and eye if the pick-up points must be defined; endless if the sling must serve many rigs and you want to rotate the wear.
  6. The length, the marking and the standard. Length between bearing points; the label layout and language your market needs; and the standard and destination market the sling must be built to.

Handling, Inspection and Limitations

A flat sling is the easiest of all the synthetic slings to inspect, because the load path is on the surface. Inspect in this order.

  1. The eyes first. Every stitch row across the fold, the webbing immediately behind the eye, and the fold itself. Broken, slack or pulled stitching condemns the sling.
  2. The bearing points. Where the band has wrapped the load — cuts, abrasion, glazing or a worn edge.
  3. The whole band. A flat band carries the load across its whole width, so a cut anywhere matters. Run it through your hands.
  4. Edges and ends. Cuts from the load’s own corners are the classic flat sling failure.
  5. Glazing and hardening. A band gone shiny or stiff has met heat or sustained friction, and the fibre is not what it was.
  6. Contamination. Acid or alkali attack leaves little visible on the outside and destroys the fibre within. If the sling has been exposed, take it out of service and ask.
  • An eye and eye sling cannot be rotated. Its wear points are fixed for life. This is the honest trade-off against an endless sling, and if you find yourself condemning slings while the middle of the band is still sound, that is the signal to move to the endless form.
  • Keep it flat, keep it off edges, keep it off heat. Those three account for most premature failures.
  • Never repair a sling. No stitching, no splicing, no knotting. A knot in a webbing sling can lose half its capacity.
  • Store it clean, dry and out of sunlight, and never on a concrete floor where it can pick up grit.
  • Record it. Log the lifts, the hitches, the loads and any damage.
Safety notice: lifting operations are inherently dangerous. Always follow the instructions of the equipment manufacturer, the practice of your national governing body, and the training you have received. Never exceed the working load limit for the configuration you are using — a straight lift, a choke and a basket are three different ratings on the same sling. If you are unsure whether a sling is fit for use, or which hitch is right for your load, ask us before you lift — and if in doubt, take it out of service.

Applications

  • Plant, machinery, skids, dies and castings — anywhere the surface must not be marked
  • Structural steel sections, beams and welded fabrications, choked or in a basket
  • Crates, stillages, pallets and boxed goods
  • Precast concrete units where a broad bearing is wanted
  • Coated, painted and powder-coated products — the large-tonnage white polypropylene band is used on coated work exactly for this reason
  • Bundles of tube, pipe and sections
  • Chemical, wet and wash-down environments, where polypropylene is the fibre of choice
  • Cold stores and cold-climate sites, where nylon keeps its composure
  • Yards, ports, depots and site work where one sling has to serve many different lifts

Two blue flat woven webbing lifting slings in basket arrangements lifting a fabricated steel component
Two blue flat woven webbing lifting slings in basket arrangements lifting a fabricated steel component
Basket arrangements on a fabricated steel component — the flat band lies broad and flat on the steel.

Customisation and OEM Service

A flat sling is built to order more often than it is bought off a rack, because the length, the width and the fibre all follow from the lift.

  • Capacity — 1 t to 30 t in the published ladder, and intermediate capacities
  • Fibre — polyester, nylon or polypropylene, chosen against heat, chemical or shock duty
  • Width and ply — matched to the load surface and the edge condition, single or double layer
  • Ends — eye and eye or endless; reinforced eyes where the hook duty is hard
  • Length — to your rig, stated between the bearing points of the eyes
  • Protection — sleeves, pads and edge protectors
  • Marking — the EN 1492-1 capacity colour and stripes, or your own scheme where the market allows; your label layout, language and figures
  • Packing — coiled, bagged or baled; custom export packing

Quality Control

Every length of webbing is checked for weave, width and colour before it is cut. Every formed eye is checked on its fold and on the number and continuity of its stitch rows. Every finished sling is checked on its length, its capacity marking, its label and its traceability code before packing, and each batch is tested. We have manufactured slings, webbing and rope products for industrial, safety and export customers for close to three decades, and we keep the process visible: on request we supply the webbing certificate, the batch test figures and a sample sling for you to handle and test before volume production begins.

Certification: if your project requires a specific standard marking or a documented certificate with the consignment, tell us before the order and we will confirm exactly what can be provided for the capacity, fibre and configuration you need.

Frequently Asked Questions

What is a flat lifting sling?

A flat woven webbing sling: a rated lifting sling whose load-bearing element is a band of woven webbing with a rectangular cross-section, built to EN 1492-1. It is called flat to describe that cross-section, not the fibre, the ends or the capacity — a flat sling can be polyester, nylon or polypropylene, can have a formed eye at each end or be closed into an endless loop, and can be built from 1 t to 30 t. Its defining advantage is that it bears across a broad, flat face rather than a line, and that it needs no fittings on the load path.

Is a flat lifting sling the same as a webbing sling?

Effectively yes — flat sling and webbing sling name the same family from two directions. “Webbing” names the material it is woven from; “flat” names the shape of its cross-section. Both distinguish it from a round sling, which is a different family: a parallel fibre core inside a tubular sleeve, with a circular section.

Should I choose a flat sling or a round sling?

Choose flat when the band can lie flat against the load and the load has a wide face or edges — plate, sections, crates, machinery, boxy and flat things. Choose round when the load is round, tightly curved or awkward, where a flat band cannot lie flat and would crease or bear on a single corner. The flat form also has the inspection advantage: everything that carries the load is on the outside, where you can see it.

Polyester, nylon or polypropylene — which should I buy?

Polyester unless you have a reason not to: it has the lowest stretch for its strength and is the best all-round value, and it is what most of the capacity ladder is published in. Nylon if the sling will be shock-loaded or has to stretch to catch a load, and it also behaves better in very cold conditions. Polypropylene if the environment is wet, chemical or both, because it resists acids and alkalis better than either of the others. The fibre is identified by the colour of the sewn label, not by the colour of the webbing.

How do I know what a flat sling will lift in a choke or a basket?

The label gives the straight-lift working load limit. A choke reduces it to 0.8 times that figure. A basket at a narrow angle increases it to 2 times, falling to 1.4 times between 7 and 45 degrees and to 1 times between 45 and 60 degrees. An angled choke is reduced further, to 0.7 at 45 degrees and 0.5 at 60 degrees. A 4 t load in a choker needs a 5 t sling, because 4 ÷ 0.8 = 5.

Why are two flat slings of the same capacity different prices?

Because capacity is only one of four dimensions. The same working load limit can be built at different widths, in different numbers of layers, and in three different fibres. A wider band spreads the bearing over more of the load; a double-layer band is stiffer and lasts longer over an edge; nylon and polypropylene cost more than polyester. When you compare two quotations for “a 5 t flat sling”, compare the width, the ply and the fibre as well.

Does “double buckle” mean the sling has a metal buckle?

Almost certainly not. In this trade buckle and double buckle are normally names for an end formed by folding the webbing back on itself and stitching it — the same construction as any other formed eye, with no metal anywhere. It is the commonest misreading in the whole flat sling family, so if a quotation says buckle, ask which it is before the goods ship.

Can I get a custom capacity, fibre, width, length and marking?

Yes. We build from 1 t to 30 t in the published ladder and in intermediate capacities, in polyester, nylon or polypropylene, at the width and ply your load and edges require, in eye and eye or endless form, to the length your rig needs, with the EN 1492-1 capacity colour and stripes or your own marking scheme where the market allows. Tell us the load, the hitch, the environment and the destination market and we will work the specification out with you.

Request a Quote for Flat Lifting Slings

Send us the load and its shape, the hitch you will actually rig, the environment the sling will work in, whether the surface may be marked, the length your rig needs, and the standard and destination market the sling must be built to. We will come back with a fibre, a width, a ply, a length, a sample and a factory-direct price.

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