Cable Laid Grommet

Catalogue · Quote on request · Phone 011 345 8800 · sales@toco.co.za

Certified steel wire rope cable-laid grommet sling

Toco Lifting has manufactured and supplied cable-laid grommets to riggers, mining and heavy-haulage contractors across South Africa and the SADC region since 2002. Cable-laid grommets are an endless-loop sling, a single complete length of 6×36 IWRC wire rope formed into a closed loop and joined by a Hawser splice. They offer higher ultimate strength and greater flexibility in confined rigging applications than single-strand grommets. Toco Lifting is approved by the Department of Labour to undertake Conformance Inspections and Performance Testing (Load Testing) per approved SABS, SANS, or relevant OEM Standard. Each grommet is supplied with a Conformance Inspection Certificate.

Specifications, Working Load Limits by hitch type and angle

Body diameter is the overall outside diameter of the finished cable-laid grommet, formed from one complete length of 6×36 IWRC wire rope. Working Load Limits are shown for vertical, choker and basket hitches. Basket angles (30°, 45°, 60°) are the included angle between the legs, wider angles reduce the WLL. Safety factor 8:1 per DMR 18 of the OHS Act. Always size to the actual hitch and basket angle in service. The table shows common sizes only: cable-laid grommets are made from an initial diameter with minimum vertical lift, to any tonnage and length to suit client-specific needs not listed.

Construction

• 6×36 IWRC wire rope, six outer strands of 36 wires each, laid around an Independent Wire Rope Core (IWRC). Strand layup notation 14/7/7+7+1.
• 1960 MPa rope grade, high-strength steel wire.
• Hawser splice, a hand-formed endless splice. The grommet is one complete cut-to-length wire rope formed into a closed loop and joined by a single full-circumference tuck. The rope is tucked through the centre of the coils to form the core of the splice. There are no legs and no termination hardware, the result is an endless round sling.
• Cable-laid construction, the entire grommet is laid up from one continuous, cut-to-length length of wire rope, not assembled from separate parts.
• Body diameters from 33 mm and larger, the overall outside diameter of the finished grommet, measured across the cable-laid body. The table below shows common sizes; larger final diameters are made to order.

Approved uses

Where cable-laid grommets are used

• Heavy lifting and rigging, heavy crane lifts, gantry rigging and structural placements.
• Power stations, lifting and rigging for plant maintenance, equipment installation and shutdown work.
• Harbours and dockyards, ship and cargo lifts, harbour gantry rigging and quayside handling.
• Mining, equipment lifts, shaft rigging and headgear maintenance.
• Structural steel and fabrication, beam, column and fabrication lifts on yard and on site.
• Heavy haulage, abnormal loads, plant transfers, transformer and machinery moves.

Cable-laid grommets suit many other heavy industrial lifting applications, contact Toco Lifting to confirm the right grommet for your lift.

Frequently asked questions

What is a cable-laid grommet?

A cable-laid grommet is an endless wire-rope sling, one complete length of wire rope laid into a continuous closed loop and joined by a Hawser splice. The grommet has no end fittings; it is used as a vertical, choker or basket hitch around the load. “Cable-laid” refers to the rope construction itself: six strands laid around an Independent Wire Rope Core.

What does “6×36 IWRC” mean?

6×36 IWRC describes the wire rope construction. Six is the number of outer strands; 36 is the number of wires per strand; IWRC means Independent Wire Rope Core, the core is itself a small wire rope, not a fibre core. The 14/7/7+7+1 notation describes the layup of the 36 wires within each strand: an inner wire surrounded by layers of 7, then 7+7, then 14 wires. This construction gives a flexible rope that suits grommet fabrication.

What is a Hawser splice?

A Hawser splice is a hand-formed endless splice used to join a cable-laid grommet into a continuous closed loop. The grommet is made from one complete cut-to-length wire rope, and the splice is formed by a single full-circumference tuck, the rope is tucked through the centre of the coils to form the core. There is no clamp, swage or termination hardware in the splice; the loop is held by the rope’s own lay and friction. Toco’s cable-laid grommets use a Hawser splice as standard.

What is the safety factor on a cable-laid grommet?

Toco’s cable-laid grommets are rated with an 8:1 safety factor, in line with Driven Machinery Regulation 18 (DMR 18) of the Occupational Health and Safety Act, the breaking strength is eight times the published Working Load Limit. Where SANS or EN standards specify a different ratio, the statutory DMR 18 figure governs. WLL is the rated load in service; always size by WLL, never by breaking strain.

When would I use a cable-laid grommet instead of a single-strand grommet?

Cable-laid grommets have higher ultimate strength and greater flexibility in confined spaces than single-strand grommets, they wrap a load more tightly and tolerate side loading better. Single-strand grommets are simpler and lighter; cable-laid grommets are the choice for heavier and more demanding lift work.

Why does the WLL change with basket angle?

In a basket hitch the two legs of the sling pull at an angle, and that angle reduces the effective lifting capacity of each leg. A vertical basket gives the full 2× single-leg vertical WLL; at 30° the rated WLL drops, and at 60° it drops further. The specification table shows the rated WLL at each angle, always size to the actual basket angle in service.

Is a cable-laid grommet a lifting accessory under SA regulations?

Yes. It is a wire-rope sling under the OHS Act and the Lifting Machinery and Equipment regulations. Toco is approved by the Department of Labour to inspect and test steelwire slings, the category that includes cable-laid grommets, and supplies each grommet with a Conformance Inspection Certificate.

How do I inspect a cable-laid grommet before use?

Inspect for broken wires (counted per lay length against the inspection standard), kinks, knots or shape distortion, corrosion or rust, a broken or damaged splice, crushed sections, missing strands and visible internal wires. Reject the grommet if any limit is exceeded. A grommet must be inspected before each use and removed from service when worn. For sustained service, periodic written inspections by a competent person are required under SA OHS regulations.

Request a quote from Toco Lifting

From Toco Lifting, a South African lifting, lashing and rigging equipment supplier. Tell us the body diameter, internal loop length, hitch type and quantity for a same-day quote.

Phone: 011 345 8800  ·  Email: sales@toco.co.za  ·  Germiston (head office)  ·  Cape Town  ·  supplying the SADC region

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