Hertel K008947AS Tap Set 1-1/4-12 Unf 6 Flute Hss

Product Description

The HERTEL K008947AS is a 3-piece tap set designed for cutting 1-1/4-12 UNF internal threads in ferrous and non-ferrous metals. Built from high-speed steel with a bright uncoated finish, the set delivers consistent thread form across a range of material hardnesses. The 6-flute geometry provides additional cutting edges compared to standard 4-flute taps, improving chip load distribution and surface finish in through-hole and blind-hole applications. The set covers Class of Fit 2B and 3B, making it suitable for both standard commercial tolerances and closer-fitting thread assemblies. Overall length is 5.75 inches with a thread length of 2.5625 inches.

This tap set is used by machinists and maintenance professionals cutting large-diameter fine-pitch threads in applications such as hydraulic fittings, mechanical assemblies, and structural fastener repairs. The UNF thread standard and right-hand thread direction make it appropriate for conventional bolt and nut configurations across industrial, automotive, and general manufacturing environments. Thread limit H4 accommodates standard plating allowances and tolerance requirements for commercial-grade threaded connections.

Key Features

• 1-1/4-12 UNF thread form, right-hand cut
• 6-flute design distributes cutting load and improves chip evacuation
• High-speed steel construction handles a wide range of material hardnesses
• Bright uncoated finish suitable for use with cutting fluids on most materials
• Class of Fit 2B and 3B for commercial and close-tolerance thread applications
• 3-piece set includes taper, plug, and bottoming tap configurations for full thread-cutting flexibility

Compatibility

Designed for use in standard machine tapping setups and hand-tapping operations requiring 1-1/4-12 UNF thread form with H4 thread limit and Class of Fit 2B or 3B.

Installation Notes

Use by a qualified machinist or maintenance technician. Always secure the workpiece fully before tapping and apply appropriate cutting fluid for the base material being threaded. Power down any machine tool and confirm zero-energy state before loading or changing taps. Follow applicable shop safety standards and manufacturer torque guidance for the tapping fixture in use.