Eagle Cutting Tool HT-440-P-I 4-40 Hss Hand Plug Tap

Product Description

The EAGLE CUTTING TOOL HT-440-P-I is a 4-40 high-speed steel (HSS) hand plug tap designed for cutting internal threads in standard 4-40 UNC threaded holes. The plug chamfer — typically 3 to 5 threads of lead — makes this tap suitable for through-holes and moderately deep blind holes where thread engagement needs to start cleanly. HSS construction provides the hardness and wear resistance required for production tapping in a range of base materials. Machinists, maintenance technicians, and tool-and-die professionals reach for this style of tap when hand-threading or when running a low-speed tapping head.

The HT-440-P-I is used in light manufacturing, maintenance and repair operations (MRO), and general fabrication settings where 4-40 UNC threaded fasteners are common. Typical applications include threading holes in aluminum, mild steel, brass, and similar machinable materials. The hand tap designation indicates it is intended for manual operation with a tap wrench, though it can also be used in slow-speed machine tapping setups with appropriate toolholding.

Key Features

• 4-40 UNC thread form for standard inch-series fastener compatibility
• High-speed steel (HSS) construction for hardness and extended tool life
• Plug chamfer profile suitable for through-holes and moderately deep blind holes
• Hand tap design compatible with standard tap wrenches and low-speed tapping setups
• Lightweight at 0.31 pounds for easy single-hand operation

Compatibility

Designed as a standard 4-40 UNC hand plug tap suitable for use with any tap wrench or manual tapping fixture accepting the appropriate square-drive shank size for this thread class.

Installation Notes

Secure the workpiece firmly before tapping and ensure the tap is started square to the hole to prevent thread misalignment or tap breakage. Use an appropriate cutting fluid for the base material being threaded. Back the tap off periodically to break chips, especially in blind holes. Always wear appropriate eye protection when performing tapping operations.

Technical Specifications

• Thread Size: 4-40 UNC
• Material: High-Speed Steel (HSS)
• Tap Type: Hand Plug Tap
• Weight: 0.31 pounds
• Minimum Order Quantity: 1

Standard Information

• Brand: EAGLE CUTTING TOOL
• Manufacturer Part Number: HT-440-P-I