Osg 1315701 Interrupted Thread Pipe Tap 1-11/2 Npt Hss

Product Description

The OSG 1315701 is a 1-11/2 NPT interrupted thread pipe tap designed for cutting internal pipe threads in a range of metals. Built from high-speed steel with an oxide finish, it features 5 flutes and a modified bottoming chamfer that reduces the number of teeth in contact with the workpiece at any given moment, lowering torque requirements and improving chip evacuation. The shank diameter is 1.125 inches, the thread length is 1.75 inches, and the overall length is 3.75 inches. It is suited for use in production and maintenance environments where consistent, clean pipe threads are required in ferrous and non-ferrous base materials.

This tap is intended for tapping 1-11/2 NPT tapered pipe threads in materials including aluminum, carbon steel, cast iron, and hardened steel. The interrupted thread geometry makes it particularly effective in tough or stringy materials where chip packing is a concern. It fits standard tap wrenches and CNC tapping setups that accept a 1.125-inch shank. Typical applications include pipe fitting assembly, manifold machining, and maintenance repair operations across industrial, mechanical, and plumbing-related fabrication work.

Key Features

• Interrupted thread design reduces cutting torque and improves chip clearance
• Modified bottoming chamfer for controlled thread engagement depth
• High-speed steel construction handles aluminum, carbon steel, cast iron, and hardened steel
• Oxide finish provides moderate lubricity and corrosion resistance during cutting
• 5-flute configuration balances chip load across the cutting teeth
• Regular hook geometry suits standard tapping machine and hand-tap applications

Compatibility

Designed for cutting 1-11/2 NPT tapered pipe threads; compatible with standard tap wrenches and tapping chucks that accept a 1.125-inch shank diameter.

Installation Notes

This tap should be installed and operated by a machinist or qualified tradesperson familiar with tapping procedures and appropriate cutting fluid selection for the workpiece material. Always secure the workpiece and ensure the tap is properly aligned before engagement to prevent tap breakage. Use a cutting fluid appropriate for the material being tapped. Follow shop safety protocols and applicable OSHA guidelines when operating tapping equipment.