Hertel K008942AS Tap Set 1-12 Unf 4 Flute Hss Bright

Product Description

The HERTEL K008942AS is a 3-piece tap set ground to 1-12 UNF specifications for cutting right-hand internal threads in ferrous and non-ferrous materials. Built from high speed steel with a bright finish, this set carries a 4-flute geometry and an H4 thread limit, making it well suited for threading operations that demand close dimensional control. Overall length is 5.125 inches with a thread length of 2.5 inches. The 3B class of fit designation targets standard tolerance applications in production and maintenance environments. Machinists, toolmakers, and maintenance technicians reach for this set when cutting 1-12 UNF threads in manual or CNC tapping operations.

This tap set is used in machine shops, manufacturing facilities, and field maintenance settings where 1-12 UNF threads are required. The 1-inch, 12-thread-per-inch unified fine thread form is common in precision assemblies, hydraulic fittings, and heavy equipment components where fine thread engagement provides higher tensile strength and resistance to loosening under vibration. The 4-flute design handles through-hole and blind-hole applications in a range of workpiece materials including steel, cast iron, aluminum, and brass.

Key Features

• 1-12 UNF thread form for precision fine-thread applications
• 4-flute geometry promotes clean chip formation and accurate thread form
• High speed steel construction provides durability across a wide range of materials
• H4 thread limit for controlled tolerance threading
• Bright finish for easy visual inspection and standard lubrication compatibility
• 3B class of fit meets standard tolerance requirements for general assembly

Compatibility

Designed for use in any tapping application requiring 1-12 UNF right-hand internal threads with a 3B class of fit. Compatible with standard tap wrenches, tapping heads, and CNC rigid-tapping spindles accepting straight-shank tooling of appropriate diameter.

Installation Notes

Tap installation should be performed by a qualified machinist or maintenance technician familiar with thread cutting procedures. Always secure the workpiece and use the appropriate cutting fluid for the workpiece material before beginning the tapping operation. Verify correct tap drill size per UNF standards before drilling the pilot hole. Inspect the tap for wear or chipping before each use and discard any damaged tap immediately to avoid thread damage or breakage in the workpiece.