Inch Wring Fit Plain Guide Bushings (Bronze-Plated Copper Alloy)

In injection mold tooling, this style of plain guide bushing is used in leader-ejector spacing and die-set guidance where the moving platen must stay precisely aligned during opening/closing. The wring fit mounting approach is intended to provide consistent positional control while the parting and ejector actions cycle under load.

• Automotive and appliance die sets: helps maintain alignment of upper and lower die components, supporting stable high-cycle production and limiting wear-related misalignment.
• Electronics and connector molds: supports smooth leader action to reduce frictional stick-slip during short-stroke or tightly guided mechanisms.
• General-purpose progressive/transfer tooling: the low-friction plain bearing function promotes repeatable guidance when tolerances stack across multiple die stations.

Its bronze-plated copper alloy construction is suited for these applications because it is engineered for wear resistance in continuous mechanical guidance, while the ground or unground options help match friction and fit requirements.

This bushing uses a bronze-plated copper alloy material system for sliding wear performance in die-set guidance. The bronze plating provides a low-friction, wear-resistant bearing surface, while the copper-alloy base supports machining and dimensional stability suitable for leader bushings.

• Ground vs. unground: a ground bushing is typically selected when tighter surface finish/fit consistency is required for smoother leader action; unground versions are often used when post-fitting machining is planned.
• Heat treatment: no specific heat-treatment state (e.g., quench & temper, nitriding) is provided in the available specifications, so selection should be based on the supplier’s process documentation for the exact alloy/plating route.

Compared with fully hardened tool steels, this copper/bronze-plated approach prioritizes boundary friction control and wear behavior rather than maximizing bulk hardness/toughness trade-offs.

Selection starts by matching the inner diameter d to the leader/shaft diameter used in your mold’s guidance system. Available d range is 0.6254 to 3.7508 in, so choose the bushing size that provides the required running clearance for the leader under expected load and thermal conditions.

• Outer diameter D2: available from 1 to 4.516 in. Match D2 to the leader bushing bore size in the die set (consider press-fit or wring-fit pocket geometry).
• Length L: available from 1.21 to 4.37 in. Use length to support guidance over the required bearing zone and to reduce cocking during mold cycling.
• Finish: choose Ground when consistent sliding surface condition is needed; select Unground if your process includes final fitting or planned refinement.

Because wring-fit systems depend on installation fit quality, verify that your bushing OD and pocket tolerances align with your shop’s fitting method (mechanical wring fit and/or adhesive installation as specified for the application).