Sandvik Coromant 6967077 Extension Pipe Tap 1/4-18 Npt

Product Description

The SANDVIK COROMANT 6967077 is a 1/4-18 NPT extension pipe tap designed for cutting internal tapered pipe threads in metal workpieces. Part of the CoroTap 300 series, it features 4 flutes and a high-speed steel (HSS) construction with a steam tempered finish that improves lubricity and resistance to wear. The shank diameter measures 0.562 inches, and the overall length is 100 millimeters (approximately 3.94 inches), with a thread length of 0.787 inches. This tap is suited for machinists, pipefitters, and maintenance technicians who need accurate NPT threads for pressure-rated piping connections in production or field repair settings.

This tap is used to cut 1/4-18 NPT internal pipe threads in ferrous and non-ferrous metals. The NPT thread standard is common in plumbing, HVAC, pneumatic, and hydraulic systems where tapered threads provide a pressure-tight seal. The extension-style design allows access to recessed or difficult-to-reach bores where standard-length taps cannot reach. It is appropriate for both manual and machine tapping operations in light manufacturing and maintenance environments.

Key Features

• 1/4-18 NPT tapered thread form for pressure-rated pipe connections
• 4-flute geometry for balanced chip evacuation and thread quality
• High-speed steel construction provides toughness across a range of workpiece materials
• Steam tempered finish reduces friction and improves tap life
• 0.562-inch shank diameter compatible with standard tap holders and chucks
• CoroTap 300 series design for consistent thread accuracy

Compatibility

Designed for cutting 1/4-18 NPT internal tapered pipe threads; compatible with standard tap holders accepting a 0.562-inch shank diameter.

Installation Notes

Pipe taps are installed by machinists or pipefitters using a tap wrench, drill press, or CNC tapping machine. Always ensure the workpiece is securely clamped and the pilot hole is drilled to the correct tap drill size for 1/4-18 NPT before threading. Apply a suitable cutting fluid throughout the tapping operation to extend tap life and improve thread finish. Inspect threads with a go/no-go NPT thread gauge after tapping to verify compliance with the required thread standard.