Osg 1657001008 Spiral Flute Pipe Tap 1/16-27 Npt Hss

Product Description

The OSG 1657001008 is a spiral flute pipe tap designed to cut 1/16-27 NPT internal pipe threads in a wide range of materials. Built from high-speed steel (HSS) with a V-coating finish, this tap handles tapping operations in carbon steel, alloy steel, stainless steel, cast iron, cast aluminum, titanium, and hardened steel. The 40-degree right-hand helix promotes efficient chip evacuation up and out of the hole, reducing the risk of chip packing in blind and short through-hole applications. Overall length is 3.543 inches with a shank diameter of 0.313 inches. Licensed machinists, pipefitters, and HVAC-plumbing tradespeople rely on this tap for precision NPT thread production.

This tap is suited for production and maintenance tapping of 1/16-27 NPT pipe threads in both residential and light commercial applications. Common scenarios include threading small-bore pipe fittings, instrument ports, and sensor bosses where a leak-tight tapered pipe thread is required. Its 3-flute spiral design and 40-degree helix make it effective in CNC tapping centers and manual tap handles alike. The 0.689-inch thread length engages enough material to produce a full, functional NPT taper thread in typical pipe fitting wall thicknesses.

Key Features

• 1/16-27 NPT tapered pipe thread form for leak-tight connections
• 40-degree right-hand helix flute design for reliable chip evacuation
• 3-flute geometry balances cutting speed and thread quality
• High-speed steel construction with V-coating for extended tool life
• Compatible material applications include stainless steel, cast iron, cast aluminum, titanium, and hardened steel
• Coolant-through: No — suitable for conventional flood or manual lubrication

Compatibility

Designed for tapping 1/16-27 NPT internal pipe threads across a broad range of workpiece materials including carbon steel, alloy steel, stainless steel, cast iron, cast aluminum, titanium, and hardened steel.

Installation Notes

Installation should be performed by a qualified machinist, pipefitter, or similarly trained trade professional. Always ensure the workpiece is securely clamped and the tap is properly aligned before beginning the cut. Apply appropriate cutting fluid or tapping compound for the workpiece material to reduce heat and extend tool life. Remove and reverse the tap periodically during manual use to break chips and prevent tap breakage.