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

Product Description

The EAGLE CUTTING TOOL HT-8750-9-P-I is a 7/8-9 UNC high-speed steel (HSS) hand plug tap designed for cutting internal threads by hand. The plug chamfer — typically 3 to 5 threads of lead — makes it the standard starting choice for most through-hole and open blind-hole threading jobs. At 0.31 pounds, it is a compact tool suited for bench work and field use. Machinists, pipefitters, and maintenance technicians reach for plug taps as the general-purpose tap in any threading set. The HSS construction provides the hardness and wear resistance needed to cut threads in mild steel, aluminum, brass, and similar materials.

This tap is used wherever a 7/8-9 UNC internal thread is required. Common applications include threading repair work on fastener holes in structural steel, machinery frames, and equipment fixtures. The hand tap designation means it is driven manually with a tap wrench rather than by a machine spindle, making it appropriate for in-place repairs, low-volume production, and maintenance work where powered tapping equipment is not available or practical.

Key Features

• 7/8-9 UNC thread form for standard unified coarse-pitch internal threading
• High-speed steel (HSS) construction for hardness and wear resistance across common workpiece materials
• Plug chamfer geometry provides a balanced lead-in suitable for most through-hole and open blind-hole applications
• Hand tap design for use with a standard tap wrench — no machine spindle required
• Lightweight at 0.31 pounds, practical for portable and bench-top use

Compatibility

Designed as a hand plug tap for cutting 7/8-9 UNC internal threads in workpieces made of mild steel, aluminum, brass, and similar machinable materials.

Installation Notes

Installation is performed by a machinist or maintenance technician using a properly sized tap wrench. Before tapping, ensure the pilot hole is drilled to the correct tap drill diameter for a 7/8-9 UNC thread and that the workpiece is securely clamped. Apply cutting fluid throughout the threading operation and back the tap off periodically to break chips and reduce the risk of tap breakage. Follow applicable shop safety practices and consult relevant standards for thread fit and tolerance requirements.

Technical Specifications

• Thread Size: 7/8-9 UNC
• Material: High-Speed Steel (HSS)
• Tap Type: Hand Plug Tap
• Weight: 0.31 pounds

Standard Information

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