Hertel R837538 Nptf Pipe Tap 2-11/2 7 Flute Hss

Product Description

The HERTEL R837538 is a standard NPTF pipe tap designed for cutting 2 - 11-1/2 National Pipe Taper Fuel (NPTF) threads in metal workpieces. It features 7 flutes and is manufactured from high speed steel (HSS) with a bright, uncoated finish. The thread length measures 1.75 inches, and the short projection design keeps the tap compact for use in tighter setups. This tap is used by machinists, pipefitters, and plumbers to produce pressure-tight threaded ports in fittings, manifolds, and pipe-connection components where a fuel-rated seal is required.

This tap is suited for threading operations in ferrous and non-ferrous metals where NPTF thread form and pressure-tight fit are the primary requirements. The 7-flute configuration supports chip control during tapping in through-hole and shallow blind-hole applications at the 2-inch pipe size. It is commonly used in industrial fabrication shops, plumbing rough-in work, and HVAC or gas-system component manufacturing where NPTF ports must meet strict sealing standards without the use of sealant tape.

Key Features

• NPTF thread form produces pressure-tight seals in pipe connections
• 7-flute geometry improves chip evacuation and surface finish in larger-diameter tapping
• High speed steel construction provides hardness and wear resistance for production use
• Bright, uncoated finish allows direct visual inspection of cutting edges before and after use
• Short projection design reduces overhang and improves rigidity during tapping operations
• Shank diameter of 1.875 inches and square size of 1.406 inches suit standard machine tap holders at this size range

Compatibility

Designed for use in applications requiring a 2 - 11-1/2 NPTF thread form; compatible with standard tap holders and machine spindles accepting a 1.875-inch shank diameter with a 1.406-inch square drive.

Installation Notes

This tap should be installed and operated by a qualified machinist or tradesperson familiar with large-diameter tapping procedures. Ensure the workpiece is securely fixtured and the tap is properly aligned to the pilot hole before engagement to prevent thread damage or tap breakage. Use an appropriate cutting fluid for the material being tapped. Follow all applicable shop safety procedures and machine manufacturer guidelines when operating tapping equipment at this size.