Foot-pedal brake-lock variant of the 4-inch Envoy PU castor — keeps trolleys fixed on inclines and busy workshop floors.
This 100 mm Envoy castor is the brake-lock version of the standard 4-inch plate castor — identical polyurethane tread and ball-bearing swivel head, plus a foot-pedal brake that locks the wheel and the swivel simultaneously, preventing both rolling and steering movement. That dual lock is essential on any trolley that parks on an inclined factory floor, a loading dock ramp, or a workshop aisle where an unattended trolley could drift into machinery or staff.
Red PU castors at 100 mm diameter give the right ground clearance for heavy-duty workshop trolleys, MRO carts, and material-handling platforms. Polyurethane resists the oil and coolant spills common on fabrication and automotive workshop floors in Guwahati, Tezpur, and Dimapur, and rolls quietly enough for hospitals and clean manufacturing areas where black-rubber streaking is not acceptable.
Fabrication workshops fit them on welding-station trolleys so the cart stays put while a welder works on the assembly. Automotive service centres mount them on part-wash trolleys and engine stands. Hospitals and clinics use brake castors on medication carts and IV-stand trolleys. Textile factories in Assam use brake-castor trolleys in weaving aisles where runaway carts would damage looms.
This castor pairs with the Envoy 4" plain-plate castor for the standard two-brake-two-plain trolley configuration, and with Envoy 3-inch castors for lighter sub-frames. When specifying a full trolley build, combine with hand pallet truck components or welded mild-steel frames sourced locally in Guwahati.
| Brand | Envoy |
|---|---|
| Category | Castors & Trolleys |
| Key specs | 100 mm · brake lock variant |
| Fitting | Plate mount · 4 bolts |
| Tread material | Red polyurethane (PU) |
| Availability | In stock — price on request |
The Envoy 4" Red PU Castor — Plate (no brake) swivels freely and is used on all four corners of mobile trolleys where free movement is always required. The Plate Brake variant adds a foot-operated brake pedal on the swivel mechanism so the trolley can be locked in place during loading/unloading or when parked on a slope. For production lines and workshop trolleys, fitting two brake castors at the pushing end and two plain castors at the opposite end is the standard practice.
A 100 mm PU castor typically handles 100–150 kg per wheel depending on the bearing grade; a trolley with four such castors can carry 400–600 kg safely. Polyurethane is the preferred tread for industrial floors because it protects polished concrete, does not leave black marks like rubber, rolls quietly on steel plate, and resists oil and mild chemical contamination common on workshop floors across Assam and Guwahati.