Hertel K008218AS Straight Flute Tap 8-36 Unf Hss

Product Description

The HERTEL K008218AS is a straight flute plug tap designed for cutting internal 8-36 UNF threads in through-holes and blind holes where chip evacuation is manageable. Built from high-speed steel with a bright uncoated finish, it delivers a 2B and 3B class of fit with an H2 thread limit, making it suitable for standard tolerance threading applications. The 4-flute, right-hand configuration provides stable cutting action and consistent thread form across a range of ferrous and non-ferrous materials. Overall length is 2.125 inches. This tap is a single-piece unit with no coolant-through capability, keeping it straightforward for manual or light-duty machine tapping operations.

This tap is used in general metalworking, maintenance, repair, and light manufacturing environments. The plug chamfer — typically 3 to 5 threads of lead — makes it well-suited for starting in a drilled hole or continuing a thread started by a taper tap. It fits standard tap wrenches and tapping heads sized for the 8-series shank. Machinists, millwrights, and maintenance technicians working with small-diameter fastener threads in steel, aluminum, brass, and similar materials will find this tap a reliable choice for hand or low-speed machine tapping.

Key Features

• 8-36 UNF right-hand thread form for fine-pitch, small-diameter threading applications
• Plug chamfer provides 3-5 thread lead-in for easy hole entry and starting
• 4 straight flutes deliver stable cutting and consistent thread geometry
• H2 thread limit holds 2B and 3B class of fit tolerances
• High-speed steel construction handles a broad range of workpiece materials
• Bright uncoated finish — no coating buildup to affect thread tolerance in tight-tolerance work

Compatibility

Designed as a standard-shank straight flute tap for use with tap wrenches, T-handles, and tapping heads compatible with the 8-series thread size range. No specific OEM or model compatibility is listed for this tap.

Installation Notes

Cutting taps should be used with an appropriate tapping fluid or cutting oil matched to the workpiece material; dry tapping increases wear and risk of breakage in small-diameter taps. Secure the workpiece firmly and align the tap perpendicular to the drilled hole before applying torque. For hand tapping, advance with consistent forward pressure and back off a quarter turn periodically to break chips and prevent tap binding. Broken tap removal is difficult at this diameter — do not force a tap that has seized.