Hertel K008945AS Tap Set 1-1/8-12 Unf 4 Flute Hss

Product Description

The HERTEL K008945AS is a 3-piece tap set designed for cutting 1-1/8-12 UNF internal threads in metal workpieces. Built from high-speed steel with a bright, uncoated finish, this set delivers reliable performance in threading applications where a fine unified thread profile is required. The 4-flute geometry provides stable chip evacuation and consistent thread formation. With an overall length of 5.4375 inches and a thread length of 2.5625 inches, the set covers the full range of thread classes 2B and 3B in a right-hand configuration. It is suited for machine shop, maintenance, and production threading work.

This tap set is used in applications requiring fine-pitch UNF threads at the 1-1/8 inch diameter. The H4 thread limit designation makes it appropriate for threading into materials where close tolerance fits are needed, such as steel, aluminum, and similar metals. The right-hand thread direction suits standard fastener and fixture assemblies. A 3-piece set configuration typically includes taper, plug, and bottoming taps, allowing machinists to start, advance, and finish threads in through holes or blind holes across a range of workpiece depths.

Key Features

• 1-1/8-12 UNF thread size for fine-pitch unified thread cutting
• High-speed steel construction for durability across ferrous and non-ferrous materials
• 4-flute design supports consistent chip removal and thread accuracy
• H4 thread limit for controlled tolerance threading
• Class of fit 2B and 3B coverage in a single 3-piece set
• Bright, uncoated finish suitable for use with standard cutting fluids

Compatibility

Designed as an OEM-style replacement or direct-use tap set for applications requiring 1-1/8-12 UNF right-hand internal threads with a 2B or 3B class of fit.

Installation Notes

This tap set should be installed and operated by a qualified machinist or maintenance technician familiar with threading operations. Always secure the workpiece properly and use appropriate cutting fluid for the material being threaded. Follow the tapping sequence from taper to plug to bottoming tap when working in blind holes. Consult applicable shop safety standards and machine manufacturer guidelines before beginning any threading operation.