Hertel 87009 Hand Pulley Plug Tap 1/2-13 Unc 4 Flute Hss

Product Description

The HERTEL 87009 is a 4-flute hand pulley plug tap designed for cutting 1/2-13 UNC internal threads in a range of industrial and mechanical applications. Built from high-speed steel (HSS) with a bright finish, this tap delivers consistent thread quality and durability in production and maintenance environments. The plug chamfer style — with a tapered lead of approximately 3 to 5 threads — makes it suitable for through-hole tapping where the tap can pass fully through the workpiece. At 10 inches overall length (OAL), it provides the reach needed for pulley, hub, and deep-bore threading work. The H3 thread limit ensures a controlled fit for standard UNC tolerance classes.

This tap is used in metalworking, maintenance, and machine shop applications where 1/2-13 UNC threads must be cut by hand or with a tapping fixture. The extended 10-inch OAL is especially useful when threading deep bores or recessed features common in pulleys, sheaves, and large mechanical assemblies. It is appropriate for use in both production and field maintenance settings where precise thread engagement is required.

Key Features

• 1/2-13 UNC thread size for widely standardized fastener compatibility
• Plug chamfer for through-hole tapping with a smooth lead-in
• 4-flute design provides balanced cutting action and chip clearance
• H3 thread limit for controlled fit within standard UNC tolerance range
• High-speed steel construction for heat resistance and edge retention
• Bright finish — no coating — for easy visual inspection and general-purpose use
• 10-inch OAL provides reach for deep-bore and pulley applications

Compatibility

Designed for hand tapping or fixture-assisted tapping of 1/2-13 UNC through-holes in steel, cast iron, aluminum, and similar machinable materials where an H3 thread limit is specified.

Installation Notes

This tap is intended for use by machinists and maintenance technicians familiar with hand tapping procedures. Secure the workpiece fully before tapping and use an appropriate tapping fluid or cutting oil for the material being threaded. Apply steady, even pressure with a tap wrench and back off periodically to break chips. Inspect the tap for wear or chipping before each use — a damaged tap can seize in the bore and cause costly rework.