Hertel G837556-S Npt Pipe Tap 1/4-18 4 Flute Hss

Product Description

The HERTEL G837556-S is a standard NPT pipe tap designed to cut 1/4-18 tapered pipe threads in metal workpieces. Manufactured from high speed steel (HSS) with a bright, uncoated finish, this tap produces clean, accurate internal pipe threads used in fluid and gas line fittings. With 4 flutes and a short projection design, it is suited for tapping through or blind holes in moderate-depth applications. The 0.5625-inch shank diameter and 0.421-inch square size are compatible with standard tap wrenches and machine holders. Plumbers, pipefitters, machinists, and HVAC technicians commonly use this tap when fabricating or repairing threaded pipe connections on the job or at the shop.

This pipe tap is used in residential and commercial applications wherever NPT-threaded pipe connections are required. Typical scenarios include threading ports in manifolds, valves, pipe fittings, and pump housings across plumbing, HVAC, and light industrial work. The 1/4-18 NPT size is one of the most common pipe thread standards in North American trade work, making this tap a routine shop and field tool. The short projection geometry keeps overall tool length compact, which is useful in tighter workspaces.

Key Features

• 1/4-18 NPT thread form for standard North American tapered pipe thread applications
• High speed steel construction provides durability across a range of ferrous and non-ferrous materials
• 4 flutes for efficient chip evacuation during tapping operations
• Short projection tap type for compact reach in confined areas
• Bright, uncoated finish suitable for general-purpose threading without added surface treatment
• Thread length of 1-1/16 inches accommodates standard pipe thread engagement depth

Compatibility

Designed as an OEM-style pipe tap compatible with standard tap wrenches, T-handle drivers, and machine tap holders accepting a 0.5625-inch round shank with a 0.421-inch square drive end.

Installation Notes

NPT pipe taps are typically used by licensed plumbers, pipefitters, and machinists following applicable IPC or IFGC standards for threaded connections. Always secure the workpiece firmly and use appropriate cutting fluid to extend tap life and improve thread quality. Back the tap out periodically to clear chips, especially in deeper holes. Never force a tap against resistance, as HSS taps are susceptible to breakage under excessive torsional load.