Hertel R837535-S Pipe Tap 1-1/4-11-1/2 Nptf 5 Flutes Hss

Product Description

The HERTEL R837535-S is a standard pipe tap designed to cut National Pipe Taper Fuel (NPTF) threads into pipe fittings, manifolds, and threaded ports across a range of industrial and trade applications. Manufactured from high speed steel (HSS) with a bright, uncoated finish, this tap cuts a 1-1/4 - 11-1/2 NPTF thread form. It features 5 flutes for efficient chip evacuation and is classified as a short projection tap with an overall length of 4 inches and a thread length of 1-3/4 inches. The shank diameter is 1.3125 inches and the square size measures 0.9840 inches, making it compatible with standard tap wrenches and machine holders of the appropriate drive size.

This tap is suited for threading pipe-entry ports in hydraulic systems, pneumatic assemblies, fuel system components, and fluid handling equipment. The NPTF thread form creates a pressure-tight, metal-to-metal seal without relying solely on thread sealant, which makes it a common choice in plumbing, HVAC, and industrial maintenance work. It is appropriate for use in both hand-tapping and machine-tapping setups where controlled feed and alignment can be maintained. The short projection design is well suited to close-clearance work where a standard length tap would not fit.

Key Features

• NPTF thread form for pressure-tight, metal-to-metal pipe thread connections
• High speed steel construction for durability across a range of ferrous and non-ferrous materials
• 5-flute geometry promotes chip evacuation and reduces cutting resistance
• Short projection tap type suited for restricted-access tapping locations
• Bright, uncoated finish allows visual inspection of cutting edges before and after use
• Overall length of 4 inches with a 1-3/4 inch thread length for controlled depth engagement

Compatibility

Designed as an OEM-style replacement or direct-use pipe tap for applications requiring a 1-1/4 - 11-1/2 NPTF thread standard in pipe fittings, fluid ports, and threaded housings.

Installation Notes

This tap should be installed by a machinist, pipefitter, or qualified tradesperson familiar with threading operations. Always secure the workpiece fully and use a calibrated tap wrench or tapping machine set to the appropriate speed and feed for the material being tapped. Apply a suitable cutting fluid throughout the operation to reduce heat and extend tool life. Inspect threads with a NPTF thread gauge after tapping to verify seal integrity before final assembly.