Allen Plug NPT 1/2in Steel

The Allen Plug NPT 1/2in Steel is a precision threaded fitting engineered for hydraulic, pneumatic, and fuel system applications where reliable port closure is essential. Designed for professionals and enthusiasts who demand leak-free connections in high-pressure environments, this steel plug delivers the durability and thread security required in performance racing, agricultural equipment, industrial machinery, and automotive fabrication. The 1/2 inch NPT (National Pipe Thread) standard ensures compatibility with a wide range of industry-standard manifolds, blocks, and fluid delivery systems.

Manufactured from steel with a zinc oxide finish, the Allen Plug NPT 1/2in Steel resists corrosion and oxidation while maintaining structural integrity under demanding conditions. The tapered NPT thread profile creates a self-sealing connection that tightens as pressure increases, eliminating the need for additional sealant tape in most applications—though thread sealant is recommended for critical systems. The Allen head design allows easy installation and removal using a standard hex wrench, providing superior grip compared to slotted alternatives and reducing the risk of rounding or stripping during assembly and maintenance.

This fitting is ideal for technicians sealing unused ports in complex hydraulic circuits, cooling systems, and pressurized reservoirs. Its compact footprint—measuring 2.1 x 0.65 x 4.05 inches and weighing just 0.06 lbs—makes it suitable for tight engine bays and confined installation spaces. Compatible with any manifold or component featuring a 1/2 inch NPT female port, the Allen Plug NPT 1/2in Steel is an essential consumable for race shops, fabrication facilities, and OEM service departments.