109318 - Miller Swivel Caster 2.5-Inch 5/16-18 Thread

Genuine Miller Replacement Mobility Hardware

The Miller 109318 Swivel Caster is a specialized replacement component designed to restore the mobility and functionality of your Miller welding equipment. As a genuine OEM part, it is engineered to meet the exact specifications of the original hardware found on Miller running gear and wire feeder carts. Maintaining the structural integrity and ease of movement of your welding setup is critical for shop efficiency, and using authentic Miller parts ensures that your equipment remains safe and stable during transport.

Precision Dimensions and Fitment

This caster features a 2.50-inch diameter, a standard size for many compact and mid-range welding carts, providing a low center of gravity for stability while still clearing small debris on the shop floor. The mounting mechanism utilizes a .312-18 (5/16-18) threaded stem with a length of 0.750 inches. This specific thread pitch and stem length are crucial for a secure fit into the base of your machine or cart, preventing the wobbling or stripping that can occur with generic, ill-fitting hardware.

Durable Cushionex Construction

The wheel itself is constructed from Cushionex material. Unlike hard plastic wheels that can crack under load or transmit excessive vibration to sensitive welding electronics, Cushionex is designed to offer a balance of durability and shock absorption. This ensures a smoother glide across concrete floors, reducing noise and protecting the floor surface from marring. The wheel width of 0.812 inches provides an adequate contact patch for distributing the weight of the welder without creating unnecessary rolling resistance.

Application and Installation

Swivel casters are essential for the front steering of welding carts, allowing operators to navigate tight corners and position equipment precisely where it is needed. Over time, bearings can seize, and treads can develop flat spots. Replacing worn casters with the Miller 109318 restores the "like-new" handling of your equipment. Installation is straightforward, typically requiring only a standard wrench to tighten the stem into the receiver. Always verify your machine's serial number or parts manual to ensure this specific caster configuration matches your running gear requirements.