Osg 1311400 Npt Pipe Tap 3/8-18 4 Flute Hss

Product Description

The OSG 1311400 is a standard NPT pipe tap designed for cutting 3/8-18 tapered pipe threads in a variety of materials. Built from high-speed steel (HSS) with a bright, uncoated finish, this 4-flute tap delivers consistent thread form in aluminum and compatible ferrous and non-ferrous workpieces. The 4-flute design provides balanced cutting action and chip clearance during through and blind pipe thread applications. Overall length measures 2.563 inches with a thread length of 1.063 inches. It is used primarily by machinists, pipefitters, and plumbers working in shop or field fabrication environments where NPT-threaded fittings must be cut directly into cast or machined components.

This tap is suited for cutting 3/8-18 NPT internal pipe threads in aluminum as its primary material application, and is appropriate for general shop use in plumbing, HVAC, and light industrial fabrication. The Series 108AL designation indicates optimization for aluminum applications. The bright, uncoated surface finish makes it easy to inspect the cutting edge for wear. It is packaged and sold individually, making it a direct replacement or single-unit addition to a tap set for pipe thread work.

Key Features

• 3/8-18 NPT thread form for standard tapered pipe thread cutting
• 4-flute configuration provides balanced cutting and chip evacuation
• High-speed steel construction handles aluminum and comparable materials
• Bright, uncoated finish allows easy visual inspection of cutting edges
• High hook angle promotes smooth chip flow in ductile materials
• Series 108AL design optimized for aluminum material applications

Compatibility

Designed for cutting 3/8-18 NPT internal pipe threads, primarily in aluminum workpieces. Compatible with standard tap wrenches and machine tap holders accepting a 0.700-inch shank diameter with a 0.531-inch square drive.

Installation Notes

Installation should be performed by a qualified machinist, pipefitter, or plumber using a properly sized tap wrench or tapping fixture. Ensure the workpiece is securely fixtured and a suitable cutting fluid is applied before tapping to extend tool life and improve thread quality. Back the tap out periodically to clear chips and prevent binding. Always wear appropriate eye protection when performing tapping operations.