Plastic Sheaves, Pulleys & Rollers

Steel sheaves chew through ropes and cables; plastic sheaves do not. Machined from cast nylon or UHMWPE, a plastic sheave carries the same line loads at a seventh of the weight, never rusts, runs quietly, and measurably extends rope and cable life. That is why cranes, winches, boats, and stage rigging have been converting from steel for decades.

Every sheave is machined on the CNC lathe to your specification: outside diameter, groove profile matched to rope or cable size, and a plain bore, bronze bush, or bearing seat as your assembly requires. Keyways, circlip grooves, and flange details are all standard work. Send a drawing, or send the worn sheave and we will copy it.

Boat builders and riggers use nylon sheaves for halyards, davits, and anchor systems because they shrug off salt water that seizes steel blocks. Crane and winch maintenance teams fit cast nylon sheaves to cut boom weight and extend expensive wire rope life. Stage and event rigging favours them for quiet running. The same machining serves them all.

Beyond classic sheaves, we machine cable rollers for electrical and comms installation, guide wheels for gates and sliding doors, track rollers for materials handling, and conveyor rollers in UHMWPE for abrasive product lines. Profiles can be flat, crowned, V-grooved, or U-grooved to suit what runs over them.

Cast nylon is the standard sheave material for load capacity and toughness. Oil-filled nylon adds self-lubrication for sheaves that run continuously on plain bushes. UHMWPE suits wet, gritty, and chemical environments where its slickness and inertness win. Acetal serves small precision pulleys where dimensional stability matters most.

Most sheave orders start with a worn part and no drawing. Post it to us: we measure the groove, bore, and profile, correct for wear, and machine the replacement. The program stays on file against your account, turning a breakdown headache into a routine reorder.

We machine one-off replacements with fast turnaround and production sets for OEMs building winches, davits, and handling equipment, with consistent tolerances across the batch and volume pricing that rewards the production run.

If your sheave drawing calls up Ertalon or cast nylon MC901 by name, the trade names cross-reference shows exactly what we supply against it.

Get a quote for sheaves, pulleys, and rollers. Send the rope size, load, and shaft details, or the worn part itself, and we will price it same day.