279263 - Miller 279263 Compression Spring .312 OD x .250 ID (10-Pack)

Precision Engineering for Reliable Welding Equipment

The Miller 279263 Compression Spring is a specialized mechanical component designed to meet the rigorous standards of Miller Electric welding equipment. In the realm of industrial maintenance and repair operations (MRO), the integrity of small mechanical parts is often the deciding factor in the longevity and performance of complex machinery. This compression spring is engineered with specific dimensions—an Outer Diameter (OD) of 0.312 inches and an Inner Diameter (ID) of 0.250 inches—to ensure it fits precisely within the designated assemblies of compatible Miller power sources or wire feeders.

One of the most critical specifications for any compression spring is its spring rate, which determines the force it exerts when compressed. The Miller 279263 features a calculated rate of 5.2 lbs/in. This specific resistance is essential for applications requiring consistent, moderate tension, such as maintaining pressure on drive rolls, returning trigger mechanisms, or stabilizing internal components against vibration. Using a generic off-the-shelf spring with an incorrect rate can lead to mechanical hysteresis, improper tensioning, and ultimately, inconsistent welding arc characteristics or wire feed issues.

This product is supplied as a package of 10 units. For facility managers and equipment technicians, this packaging strategy supports efficient inventory management. Small springs are prone to loss during field repairs or fatigue over thousands of duty cycles. Having a dedicated stock of OEM-verified springs ensures that maintenance teams can perform immediate replacements without waiting for single-item shipments, thereby minimizing equipment downtime. By choosing genuine Miller parts, you ensure material compatibility and fatigue resistance that matches the original engineering design of your welding assets.

Technical Specifications and Fitment

When servicing high-performance welding machines, verifying the dimensional accuracy of replacement parts is paramount. The 0.250-inch inner diameter of this spring is designed to clear guide rods or shafts without binding, while the 0.312-inch outer diameter ensures it seats correctly within housing bores or cups. The use of high-quality spring steel in OEM manufacturing provides excellent resistance to setting (loss of height) and relaxation over time, even in the thermal environments often found inside welding power sources.