Eagle Cutting Tool HT-8750-9-P-D 7/8-9 Hss Hand Plug Tap

Product Description

The EAGLE CUTTING TOOL HT-8750-9-P-D is a 7/8-9 high-speed steel (HSS) hand plug tap manufactured in the USA. This tap cuts internal threads in through-holes and blind holes where a plug chamfer entry angle is required. The plug chamfer — typically 3 to 5 threads of lead — provides a balance between taper lead-in ease and the ability to thread closer to the bottom of a hole than a taper tap allows. Built from HSS for wear resistance and toughness, this tap is suited for threading steel, iron, aluminum, and similar machinable materials by hand or in low-speed machine tapping operations.

The HT-8750-9-P-D is used in maintenance, repair, and fabrication settings where 7/8-9 UNC threads are required. At 7/8 inch nominal diameter with 9 threads per inch, this is a coarse-thread tap commonly used in structural and heavy mechanical applications. Machinists, tool-and-die tradespeople, maintenance mechanics, and industrial fabricators rely on this size for tapping bolted connections in frames, fixtures, and machinery. It is driven with a standard tap wrench and appropriate tapping fluid for the workpiece material.

Key Features

• 7/8-9 UNC thread form for coarse-pitch internal threading
• High-speed steel (HSS) construction for wear resistance across a range of machinable metals
• Plug chamfer style — approximately 3 to 5 threads of lead — balances starting ease with near-bottom thread reach
• USA manufactured
• Minimum order quantity of 1 for single-unit procurement

Compatibility

Designed as a hand plug tap for cutting 7/8-9 UNC internal threads; compatible with standard 7/8-9 tap wrench drives and suitable for use in steel, cast iron, aluminum, and other machinable materials where this thread specification is required.

Installation Notes

A licensed machinist or qualified maintenance mechanic should select the correct tap drill size for 7/8-9 UNC threads before tapping. Secure the workpiece firmly before starting the tap, and apply appropriate tapping fluid to reduce friction and extend tool life. Back the tap off periodically to break chips, especially in blind holes. Inspect the tap for wear or chipping before each use — a damaged tap can seize in the hole and damage the workpiece.

Technical Specifications

• Thread Size: 7/8-9 UNC
• Tap Type: Hand Plug Tap
• Material: High-Speed Steel (HSS)
• Country of Origin: USA
• Weight: 1.78 pounds

Standard Information

• Brand: EAGLE CUTTING TOOL
• Manufacturer Part Number: HT-8750-9-P-D