Gibraltar BW8661-G Die Mold Sprue Bushing Steel

Product Description

The GIBRALTAR BW8661-G is a die mold sprue bushing designed to control the flow of molten material from the injection nozzle into the mold cavity. Built from steel, it features a 0.75 inch shank diameter with a 2.9375 inch shank length and a 2 inch head diameter, giving it an overall length of 3.78125 inches. The 0.15625 inch hole diameter and 0.1875 inch cavity depth provide precise gate control suited to tooling applications in injection molding operations. Mold makers and toolroom machinists install this component during mold assembly or repair work where accurate sprue geometry is required.

The BW8661-G suits injection mold tooling applications in industrial and manufacturing environments. It is used in situations where a standardized sprue bushing geometry is needed, including mold builds and component replacement in existing tooling. The Series U designation identifies it within the GIBRALTAR standardized bushing product line, allowing toolmakers to cross-reference and replace worn or damaged bushings with a consistent fit. The 0.5 inch corner radius and 0.875 inch head height support proper seating and alignment in compatible mold bases.

Key Features

• Steel construction for durability under repeated injection molding cycle stress
• 0.75 inch shank diameter with 2.9375 inch shank length for deep mold plate fitment
• 2 inch head diameter with 0.875 inch head height for stable mold base seating
• 0.15625 inch hole diameter for controlled sprue gate geometry
• 0.1875 inch cavity depth and 0.5 inch corner radius for consistent material flow transition
• Series U classification for straightforward cross-reference and replacement

Compatibility

Designed as an OEM-style replacement sprue bushing for injection mold tooling applications requiring a Series U bushing with a 0.75 inch shank diameter and 2 inch head diameter.

Installation Notes

Installation is typically performed by a mold maker or toolroom machinist during mold assembly or maintenance. The mold should be fully de-energized, cooled, and depressurized before disassembly. Press-fit or slip-fit installation should follow mold base tolerances specified in the tooling drawings. Verify sprue bushing alignment with the injection nozzle seat before returning the mold to service.