The RCBS Bushing 1 1/2"-12 To 1"-14 (Model R57191-1) is a heavy-duty, precision-machined steel thread-adapter bushing designed for specialized metallic cartridge reloading. Operating as a static, non-powered mechanical reducer, this bushing allows handloaders to run oversized reloading dies inside massive, heavy-frame single-stage reloading presses. Constructed from solid steel with a corrosion-resistant black oxide finish, it provides the rigid, high-strength connection necessary to withstand the extreme mechanical pressures associated with sizing large-caliber rifle brass.

Key Features

• Thread-Reduction Interface: Bridges the gap between extra-large press frame receivers and specialized, large-diameter reloading dies.
• Heavy-Duty Steel Construction: Machined from solid steel and finished in black oxide to ensure durability and thread integrity under high-torque reloading operations.
• Oversized Die Integration: Enables the secure mounting of specialized 1"-14 TPI threaded dies, such as custom resizing dies and Safari-series dies.
• High-Pressure Stability: Built to maintain precise axial alignment without flexing, which is critical for reloading large rifle cartridges.

Product Specifications

• Outer Thread (Male): 1 1/2"-12 TPI (Threads Per Inch)
• Inner Thread (Female): 1"-14 TPI
• Material: Precision-machined steel with a black oxide finish
• Compatible Press Frames: Heavy-duty presses with a 1 1/2"-12 threaded head plate (such as the RCBS AmmoMaster, Corbin CSP-2 Mega-Mite, and CHP-1 Hydro Press)
• Compatible Die Bodies: Large-format reloading dies utilizing 1"-14 threads (including .500 Jeffery and .505 Gibbs safari dies)
• Operation: Static mechanical adapter

Who is the Rcbs Bushing 1 1/2"-12 To 1"-14 for?

• Big-game safari handloaders — because they require a robust reduction bushing to mount oversized 1-inch (1"-14 TPI) reloading dies for large-bore calibres into their extra-large press frames.
• Operators of heavy-frame presses — because their single-stage reloading presses utilize a large 1 1/2-inch (1 1/2"-12 TPI) receiver thread that must be adapted down with this RCBS thread bushing to accept specialized custom dies.

Less suitable for: Handloaders using standard reloading dies with 7/8"-14 TPI threads, or those utilizing standard-frame presses with 1 1/4"-12 TPI receiver threads, who instead require a smaller 7/8"-14 TPI adapter bushing.