The Envoy 4" Red PU Castor (plate-mount, 100 mm, ball bearing) is the step up from the 75 mm series for heavier workshop carts — Multi Trade Combines stocks it in Guwahati for Northeast India, price on request.
The Envoy 4-inch Red PU castor is the medium-duty workhorse in the Envoy plate-fit range. At 100 mm wheel diameter it bridges the gap between light-duty 50 mm office furniture wheels and heavy-duty 125–150 mm swivel castors used on pallet trolleys. The polyurethane wheel compound delivers a hardness that resists chunking on rough concrete while remaining quiet on tile and polished floors — a combination that makes these castors popular in both factory aisles and hospital storeroom carts.
Ball-bearing races in the wheel hub allow the cart to roll freely with minimal push effort, which matters when operators are shifting loaded carts repeatedly across long warehouse aisles. The plate-mount base (standard 4-hole bolt pattern) attaches to flat welded frames or formed-steel corners without requiring a threaded socket tube.
Fabricators in Guwahati's metalwork belt use the 4-inch castor when building custom carts for tea factories, where trolleys carry baskets of fresh leaf from weighing stations to withering troughs. Hospital and clinic supply managers in Assam specify the quiet PU wheel for medication trolleys that must roll without noise across ward floors. Printing and paper firms in Meghalaya mount these on heavy paper-reel trolleys where floor-loading rules out the smaller 75 mm wheel.
Pair four of these plate castors with the Envoy 3-inch braked variant on a six-castor trolley frame for load-locking capability: the braked wheels hold the trolley stationary during loading while the unbraked 4-inch units take the main rolling load. Multi Trade Combines stocks both sizes. If you are building a new trolley frame, the Hand Pallet Truck in our Lifting & Handling range is often a faster solution for high-volume pallet movement; ask our team which fits your application.
| Brand | Envoy |
|---|---|
| Category | Castors & Trolleys |
| Key specs | 100 mm · ball bearing · medium duty |
| Wheel diameter | 100 mm (4 inch) |
| Bearing type | Ball bearing |
| Mount type | Plate (bolt-on) |
| Availability | In stock — price on request |
More from our Castors & Trolleys range
The 100 mm (4-inch) wheel distributes load over a larger contact patch, which reduces floor pressure and rolls more smoothly over uneven surfaces like workshop floor expansion joints or tile edges. The 4-inch version suits carts carrying 200–300 kg payloads where the 3-inch 75 mm model would deform over time under repeated loading cycles. Ball-bearing races in both sizes eliminate the need for periodic lubrication under normal use.
Red polyurethane wheels resist oil splashes, mild acid spills and industrial solvent mists, making them a common choice for chemical storage trolleys and food-processing material carts. The plate-mount fitting allows attachment to fabricated steel frames without welded sockets. For genuinely corrosive washdown environments, ask our team for stainless-hardware options when placing an order.