Hertel K008924AS Tap Set 5/16-24 Unf 4 Flute Hss

Product Description

The HERTEL K008924AS is a 3-piece tap set designed for cutting 5/16-24 UNF internal threads in metal workpieces. Built from high speed steel with a bright finish, this set covers the full hand-tap sequence needed for through-hole and blind-hole threading applications. The overall length of 2-23/32 inches provides sufficient reach for standard fastener tapping depths. With 4 flutes and an H3 thread limit, the set holds tight tolerances and suits production and maintenance environments alike. Licensed machinists, tool-and-die workers, and maintenance technicians are the primary users of this tap set.

This tap set is suited for threading ferrous and non-ferrous metals in both shop and field maintenance settings. The 5/16-24 UNF thread form is a fine-pitch unified national fine designation common in automotive, aerospace, and general mechanical assemblies where vibration resistance and precise thread engagement are priorities. The 2B and 3B class of fit coverage makes the set versatile across standard tolerance and close-tolerance applications without requiring separate tooling for each class.

Key Features

• 5/16-24 UNF thread form with H3 thread limit for consistent tolerance control
• 4-flute geometry for balanced cutting and chip evacuation
• High speed steel construction for durability across a range of metal workpiece materials
• Bright finish with no coating buildup, preserving sharp cutting edges out of the box
• Covers 2B and 3B class of fit in a single 3-piece set
• 2-23/32 inch overall length suitable for standard tapping depths

Compatibility

Designed as a standard hand-tap replacement set for applications requiring 5/16-24 UNF internal threading. Compatible with tap handles and tap wrenches sized for 5/16-inch tap shanks.

Installation Notes

Secure the workpiece firmly before tapping to prevent movement during thread cutting. Use a cutting fluid appropriate for the workpiece material to reduce heat and extend tap life. Progress through the tap sequence in order - taper, plug, then bottoming - and back off periodically to break chips, especially in blind holes. Inspect threads with a GO/NO-GO gauge after tapping to verify class of fit compliance.