Eagle Cutting Tool HT-440-T-D 4-40 Hss Taper Tap

Product Description

The EAGLE CUTTING TOOL HT-440-T-D is a 4-40 high-speed steel (HSS) taper tap manufactured in the USA. Taper taps feature a gradual thread lead — typically 7 to 10 chamfered threads — that distributes cutting forces progressively, making them the standard starting choice for threading new holes in metal, plastic, and other machinable materials. The 4-40 designation indicates a No. 4 screw size with 40 threads per inch (UNC), a common thread specification in light mechanical assemblies, electronics hardware, and small-device fabrication. HSS construction provides the hardness and heat resistance needed for reliable performance across a range of workpiece materials.

This tap is suited for use in machine shops, maintenance and repair operations, and light manufacturing environments where 4-40 threaded holes are required. It is appropriate for hand tapping with a tap wrench or for use in drill press and CNC tapping setups at controlled feeds and speeds. Machinists, tool-and-die workers, and maintenance technicians working on small fastener assemblies will find this a standard bench tool for initiating threads in through-holes or blind holes where the taper lead has sufficient clearance to run out.

Key Features

• 4-40 UNC thread form — No. 4 screw size, 40 threads per inch
• High-speed steel (HSS) construction for hardness and heat resistance
• Taper chamfer distributes cutting load gradually for easier thread starts
• USA manufactured
• Minimum order quantity of 1 — available as a single unit

Compatibility

Designed as a standard 4-40 UNC taper tap compatible with any tap wrench, T-handle, or machine tapping setup configured for the corresponding tap shank size.

Installation Notes

Secure the workpiece firmly before tapping and ensure the tap is started straight to the hole axis. Apply appropriate cutting fluid for the workpiece material to reduce friction and extend tap life. Back the tap out periodically to break chips when tapping blind holes. Follow shop safety practices and wear eye protection when hand tapping or machine tapping.

Technical Specifications

• Thread Size: 4-40 UNC
• Tap Type: Taper
• Material: High-Speed Steel (HSS)
• Country of Origin: USA
• Weight: 0.04 pounds

Standard Information

• Brand: EAGLE CUTTING TOOL
• Manufacturer Part Number: HT-440-T-D