Gibraltar BW8638-G Die Mold Sprue Bushing Series B

Product Description

The GIBRALTAR BW8638-G is a Series B die mold sprue bushing machined from steel for use in injection mold and die casting tooling. It features a 1-inch shank diameter and a 2-inch head diameter, with an overall length of 5-25/32 inches. The shank length measures 4-29/32 inches. This bushing channels molten material from the injection nozzle into the mold cavity through a 7/32-inch hole diameter. It is sized and finished for precision-fit installation in production tooling and is typically handled by toolmakers, moldmakers, or maintenance machinists in a shop environment.

The BW8638-G is suited for use in injection molding and die casting operations where a standard Series B sprue bushing is required. The 7/8-inch head height, 3/16-inch cavity depth, and 1/2-inch corner radius are consistent with common production mold configurations. It is used in both prototype and high-volume production tooling where dimensional consistency and material durability are critical to gate integrity and part quality.

Key Features

• Series B configuration with 1-inch shank diameter and 2-inch head diameter
• 7/32-inch hole diameter for controlled material flow from injection nozzle to cavity
• 3/16-inch cavity depth and 1/2-inch corner radius for consistent gate geometry
• Steel construction for durability in high-cycle mold tooling applications
• Overall length of 5-25/32 inches with a 4-29/32-inch shank length for deep-pocket mold plates

Compatibility

Designed as an OEM-style replacement or new-installation sprue bushing for Series B die mold tooling requiring a 1-inch shank diameter and 2-inch head diameter configuration.

Installation Notes

Installation is performed by qualified toolmakers or moldmakers. The mold must be fully disassembled and all hydraulic or injection press pressure relieved before bushing removal or installation. Verify bore tolerances in the mold plate before pressing or fitting the bushing to ensure proper seating and concentricity. Follow applicable shop safety procedures and equipment lockout/tagout protocols during service.