Osg 1330101 Nps Pipe Tap 1/8-27 4 Flute Hss

Product Description

The OSG 1330101 is a standard NPS pipe tap designed to cut internal tapered pipe threads in metal workpieces. Sized at 1/8-27, it produces threads conforming to the National Pipe Straight standard at 27 threads per inch. The tap is machined from high-speed steel and carries an oxide finish that provides basic lubricity and corrosion resistance during cutting operations. With 4 flutes and a regular hook geometry, it evacuates chips consistently through a range of common metals. Overall length is 2.126 inches, with a thread length of 0.75 inches, a shank diameter of 0.4375 inches, and a square drive size of 0.328 inches. It is installed using a standard tap wrench or machine holder.

This tap is suited for threading pipe fittings, manifold ports, valve bodies, and similar components in plumbing, HVAC, and mechanical applications. It cuts cleanly in aluminum, carbon steel, and cast iron, and is also rated for use in hardened steel. Typical applications include threading NPT-compatible ports on equipment housings and creating pipe thread connections in fabricated assemblies. The 1/8-27 size is a common pipe thread dimension encountered in residential and light commercial plumbing, gas line fittings, and instrumentation connections.

Key Features

• 1/8-27 NPS thread form at 27 threads per inch
• High-speed steel construction for durability across ferrous and non-ferrous materials
• Oxide finish reduces friction and provides corrosion resistance during cutting
• 4-flute regular hook geometry for consistent chip evacuation
• Thread length of 0.75 inches suitable for standard pipe thread depth requirements
• Compatible with tap wrenches and machine setups via 0.4375-inch shank diameter

Compatibility

Designed for tapping 1/8-27 NPS pipe threads in aluminum, carbon steel, cast iron, and hardened steel workpieces.

Installation Notes

Installation should be performed by a machinist or trade professional familiar with tapping operations. Secure the workpiece firmly before beginning and apply cutting fluid appropriate for the material being threaded. Use a calibrated tap wrench or CNC holder to maintain alignment and prevent tap breakage. Back the tap out periodically to clear chips, especially in blind-hole applications.