Category: Usha Martin Wire Ropes

Sealinkers has stocked and cut Usha Martin steel wire ropes at Darukhana, Mumbai since 1977, and it remains the rope we recommend first for general engineering, marine and crane duty across India. This category covers the full spread of constructions and diameters, sold by the metre — you tell us the duty, we cut from coil and despatch, whether that is a short crane rope replacement or a full reel for a shipyard.

Three decisions narrow the choice quickly. First, construction: finer constructions such as 6×36 flex better around sheaves and drums, while coarser ones such as 6×19 resist abrasion and crushing — our wire rope construction guide walks through the notation. Second, core: an independent wire rope core (IWRC) gives a stiffer, stronger rope for hoisting and hot or heavy work, while a fibre core (FC) suits lighter, more flexible duty. Third, finish and lay: galvanised for marine exposure, ungalvanised for sheltered machinery, with lay direction matched to the drum.

Every Usha Martin rope we supply carries the mill test certificate, and where the rope goes into a lifting appliance we can proof-test the finished assembly in our own in-house test house. For ropes working at ports under the Dock Workers (Safety, Health and Welfare) Act, that competent-person examination trail matters as much as the rope itself — inspectors ask for the paperwork before they look at the rope.

Ropes here are supplied against IS 2266 scope for general engineering purposes, with care, inspection and discard guidance drawn from IS 3973 and ISO 4309. If you are unsure between two constructions, send us the machine, the duty and the environment — that is usually enough to settle it.

Buying questions

Do you cut Usha Martin rope to length, and how fast?

Yes — cutting by the metre from stock coils is our standard trade. Common constructions and diameters usually cut and despatch quickly from our Darukhana godown; less common sizes may need to come from the mill, which takes longer. Tell us the diameter, construction and length when you enquire and we will confirm stock and a realistic despatch date straight away.

What certification comes with the rope?

Every Usha Martin rope we supply includes the mill test certificate, which records the rope construction, grade and tested breaking force for that production lot. If the rope is being fitted into a sling or lifting appliance, we can additionally proof-test the finished assembly in our in-house test house and issue the test and examination certificate your inspector will ask for.

How do I choose between 6×19 and 6×36 class constructions?

As a rule of thumb, choose the finer 6×36 class where the rope bends repeatedly over sheaves and drums — it is more flexible and fatigue-resistant. Choose the coarser 6×19 class where abrasion and crushing dominate, such as dragging duty or single-layer winding. If you are replacing an existing rope, match the original construction unless the failure mode tells you otherwise.

When should a wire rope be discarded?

Discard is governed by broken-wire counts, wear, corrosion, kinking, crushing and core failure rather than age alone — IS 3973 and ISO 4309 set out the criteria. Practically: visible broken wires clustered in one lay length, significant diameter reduction, or any kink or birdcage means the rope comes off. If in doubt, bring it to us or send photographs and we will advise.