Eagle Cutting Tool HT-4375-20-P-D 7/16-20 Hss Hand Plug Tap

Product Description

The EAGLE CUTTING TOOL HT-4375-20-P-D is a 7/16-20 UNF hand plug tap ground from high-speed steel (HSS). It is used to cut internal threads by hand in metal workpieces, producing a 7/16-inch diameter thread with 20 threads per inch — a fine-pitch UNF profile. The plug chamfer, typically 3 to 5 threads of taper, allows the tap to start easily in a drilled hole and continue threading through most of the hole depth. Manufactured in the USA, this tap is suited for machinists, pipefitters, millwrights, and maintenance technicians who need a reliable hand-threading tool for steel, aluminum, and similar materials.

This tap is designed for hand-tapping operations where a tapping handle or T-handle wrench is used. It is appropriate for production maintenance, repair work, and fabrication tasks that require cutting 7/16-20 UNF internal threads in through-holes or blind holes where a plug chamfer provides sufficient thread engagement. It is commonly used in industrial, mechanical, and trade settings where fine-thread fastener connections are required.

Key Features

• 7/16-20 UNF thread form — fine-pitch profile for strong thread engagement
• Plug chamfer style for easy starting and general-purpose through-hole or blind-hole tapping
• High-speed steel (HSS) construction for durability across steel, aluminum, and similar materials
• Manufactured in the USA
• Minimum order quantity of 1 — available as a single unit

Compatibility

Designed as a standard hand plug tap for use in any application requiring 7/16-20 UNF internal threads, compatible with any standard tap handle or T-handle wrench sized for the tap's square drive shank.

Installation Notes

A licensed machinist or qualified tradesperson should use this tap with a properly sized tap handle and cutting fluid appropriate for the workpiece material. Always drill the correct tap drill size for 7/16-20 UNF threads before tapping to avoid tap breakage. Keep the tap aligned square to the workpiece surface during starting. Back off the tap periodically to break chips, especially in blind holes.

Technical Specifications

• Thread Size: 7/16-20 UNF
• Tap Type: Hand Plug Tap
Material: High-Speed Steel (HSS)
• Country of Origin: USA
• Weight: 0.32 pounds

Standard Information

• Brand: EAGLE CUTTING TOOL
• Manufacturer Part Number: HT-4375-20-P-D