Hertel K008408AS Straight Flute Tap 5/16-24 Unf Hss

Product Description

The HERTEL K008408AS is a straight flute tap designed to cut right-hand internal threads to the 5/16-24 UNF standard. Built from high-speed steel with a bright, uncoated finish, this tap delivers reliable thread-forming performance in ferrous and non-ferrous materials. The taper chamfer eases entry into the workpiece and distributes cutting load across the leading flutes, reducing the risk of tap breakage during starting. At 2-23/32 inches overall length and featuring 4 flutes, it is suited for use in drill presses, CNC machining centers, and manual tapping operations. A 3B class of fit and H3 thread limit ensure threads meet standard tolerance requirements for typical mechanical assemblies.

This tap is appropriate for threading through-holes in production and maintenance machining environments. Machinists, tool-and-die tradespeople, and maintenance technicians use this style of tap when threading mild steel, aluminum, brass, and similar materials to a 5/16-24 UNF specification. The taper chamfer makes it particularly effective as a starting tap in hand or machine tapping sequences, especially where hole alignment and entry control are priorities.

Key Features

• 5/16-24 UNF thread standard with right-hand thread direction
• Taper chamfer for controlled entry and reduced starting torque
• 4 straight flutes for chip clearance in through-hole applications
• H3 thread limit meets 3B class of fit tolerances
• High-speed steel construction for durability across common workpiece materials
• Bright, uncoated finish suitable for use with standard cutting fluids

Compatibility

Designed as an OEM-style replacement or direct-use tap for applications requiring a 5/16-24 UNF straight flute taper tap with a 3B class of fit in standard machining and maintenance threading operations.

Installation Notes

This tap is installed by machinists and maintenance tradespeople using standard tapping equipment; ensure the workpiece is securely fixtured and the pilot hole is drilled to the correct tap drill size for 5/16-24 UNF before beginning. Apply appropriate cutting fluid for the workpiece material to extend tap life and improve thread finish. Never force a tap against resistance; back off periodically to break chips and prevent binding. Follow applicable shop safety procedures and machine guarding requirements when power tapping.