Osg 1315201 Pipe Tap 1/8-27 Npt 5 Flute Hss Oxide

Product Description

The OSG 1315201 is an interrupted thread pipe tap designed for cutting 1/8-27 NPT internal pipe threads in a range of workpiece materials. Built from high-speed steel with an oxide finish, this tap is engineered for rigidity and chip evacuation in production and maintenance tapping operations. The interrupted thread geometry reduces cutting forces and helps clear chips from the thread form, making it well suited to both through-hole and blind-hole applications. The modified bottoming chamfer allows the tap to start threads closer to the bottom of a hole than a standard taper pipe tap. With 5 flutes and a 0.32-inch square drive size, this tap fits standard tap wrenches and machine holders for hand or light machine tapping.

The 1315201 is intended for use in pipe thread tapping operations across metalworking, maintenance, and mechanical assembly applications. It handles a variety of materials including aluminum, carbon steel, cast iron, and hardened steel. The 1/8-27 NPT thread size is common in fittings, instrumentation ports, hydraulic manifolds, and pneumatic components. This tap belongs to OSG Series 108G and is appropriate for job shop and production environments where accurate NPT threads are required in these material types.

Key Features

• Interrupted thread geometry reduces cutting torque and improves chip clearance
• Modified bottoming chamfer for threading closer to blind-hole bottoms
• High-speed steel construction for durability across aluminum, carbon steel, cast iron, and hardened steel
• Oxide finish for surface protection and reduced galling
• 5 flutes with regular hook for controlled cutting action
• OSG Series 108G for consistent dimensional accuracy on NPT threads

Compatibility

Designed for cutting 1/8-27 NPT internal threads; compatible with materials including aluminum, carbon steel, cast iron, and hardened steel. Fits standard tap wrenches and machine tap holders accepting a 0.32-inch square drive.

Installation Notes

This tap is installed by licensed machinists or maintenance technicians using a standard tap wrench or tapping machine. Always secure the workpiece and ensure the correct pilot hole diameter for 1/8-27 NPT threads is drilled before tapping. Apply appropriate cutting fluid for the workpiece material to extend tap life and improve thread finish. Do not force the tap if resistance is excessive, as high-speed steel is susceptible to breakage under side loading or sudden torque spikes.