Eagle Cutting Tool HT-640-T-D 6-40 Hss Taper Tap

Product Description

The EAGLE CUTTING TOOL HT-640-T-D is a 6-40 high-speed steel taper tap manufactured in the United States. It is designed to cut internal threads in through-holes and blind holes where the tapered lead angle helps guide the tap into the workpiece for accurate thread engagement. The taper style provides a gradual cutting action, distributing cutting load across multiple leading threads to reduce breakage risk in harder materials. This tap is a standard hand and machine tap used by machinists, pipefitters, electricians, and HVAC technicians when threading small fastener holes in metal components and enclosures.

The HT-640-T-D is suited for threading 6-40 Unified Fine (UNF) holes in ferrous and non-ferrous metals. Common applications include electrical panel fabrication, HVAC equipment assembly, control board mounting hardware, and general sheet metal work where small-diameter precision threads are required. It is appropriate for both production machine tapping and hand-tapping operations on the bench.

Key Features

• 6-40 UNF thread form for small-diameter precision threading applications
• High-speed steel (HSS) construction provides durability and heat resistance during cutting
• Taper lead angle distributes cutting load to reduce tap breakage in harder materials
• USA manufactured for consistent dimensional accuracy and thread quality
• Lightweight at 0.08 pounds, easy to handle in confined work areas

Compatibility

Designed as a standard 6-40 UNF taper tap compatible with manual tap handles and machine tap holders sized for small-shank hand taps.

Installation Notes

Tapping should be performed by a machinist or qualified tradesperson using the appropriate tap handle or tapping head. Always drill the correct tap drill size for a 6-40 thread before starting the tap, and use a suitable cutting fluid to extend tap life and improve thread quality. Back the tap off periodically to break chips and prevent binding. Never force a tap; if resistance increases unexpectedly, back out and clear chips before continuing.

Technical Specifications

• Thread Size: 6-40
• Thread Form: Unified Fine (UNF)
• Tap Style: Taper
• Material: High-Speed Steel (HSS)
• Country of Origin: USA
• Weight: 0.08 pounds

Standard Information

• Brand: EAGLE CUTTING TOOL
• Manufacturer Part Number: HT-640-T-D