Hertel K008508AS25 Straight Flute Tap 1/2-13 Unc Hss Tin

Product Description

The HERTEL K008508AS25 is a straight flute plug tap designed for cutting 1/2-13 UNC right-hand internal threads in a variety of workpiece materials. Built from high-speed steel (HSS) with a titanium nitride (TiN) coating, it delivers improved wear resistance and extended tool life compared to uncoated taps. The plug chamfer distributes cutting load gradually across several leading threads, making it well suited for through-hole applications. Thread limit is H3, and the class of fit is 3B, providing standard tolerance threads for most general-purpose mechanical assemblies. This tap is used by machinists, maintenance technicians, and toolroom professionals working in metalworking, fabrication, and repair environments.

This tap is appropriate for through-hole threading operations in ferrous and non-ferrous metals where a 1/2-13 UNC thread form is required. The straight flute geometry makes it best suited for materials that produce short, brittle chips. It is a single-pass plug tap intended for hand tapping or machine tapping on drill presses, CNC machining centers, and tapping machines where coolant-through tooling is not required. The 3-3/8 inch overall length provides adequate reach for standard depth applications in production and maintenance settings.

Key Features

• 1/2-13 UNC thread form, right-hand direction, H3 thread limit for 3B class of fit
• High-speed steel construction provides toughness and re-sharpenability
• Titanium nitride (TiN) coating improves surface hardness and reduces friction at the cutting edge
• Plug chamfer distributes cutting load across leading threads, ideal for through-hole tapping
• 4-flute straight flute design handles short-chipping materials effectively
• No coolant-through requirement simplifies setup on standard tapping equipment

Compatibility

Designed as an OEM-style replacement or direct tooling selection for 1/2-13 UNC plug tap applications on standard hand tapping equipment, drill presses, and CNC machining centers that accept straight-shank taps.

Installation Notes

Installation should be performed by a qualified machinist or maintenance technician familiar with thread-cutting operations. Ensure the workpiece is securely fixtured and that the pilot hole is drilled to the correct tap drill diameter for a 1/2-13 UNC thread before beginning. Apply appropriate cutting fluid for the workpiece material to reduce tool wear and improve thread finish. Do not force the tap if resistance increases unexpectedly — back off to break chips and re-apply cutting fluid.