Structural analysis of the Shepherd Hardware Twin Wheel Casters confirms an industry-standard analog interface. The design utilizes a 7/16-inch x 7/8-inch (11mm x 22mm) friction ring stem, compatible with approximately 95% of commercial office chair frames. The twin-wheel architecture is specifically engineered to prevent rapid carpet fatigue by distributing weight across two contact points.
Material data indicates the use of injection-molded nylon for the wheels, characterized by a high Shore D hardness rating. This material property provides high durability on textiles but offers zero shock absorption and may be abrasive on hardwood or laminate. The stem is constructed of zinc-plated steel, designed for press-fit installation into standardized sockets.
Operational limitations include a weight ceiling suitable for standard office use; dynamic loads exceeding 250 lbs may result in stem deformation. Furthermore, the exposed axle gap serves as a collection point for hair and carpet fibers, which can impact rotation fidelity over time.
The Shepherd Hardware casters are a technically appropriate choice for budget-conscious structural restoration of seating used primarily on commercial-grade carpets.
As part of the custom chair components classification, these units provide a baseline mechanical solution for traditional office seating.
