Eagle Cutting Tool SP-440-P-I 4-40 Hss Spiral Point Plug Tap

Product Description

The EAGLE CUTTING TOOL SP-440-P-I is a 4-40 high-speed steel (HSS) spiral point plug tap designed for threading operations in metal fabrication and machining applications. The spiral point geometry drives chips forward ahead of the cutting flutes, reducing clogging and allowing smooth through-hole tapping. Built from HSS, this tap offers the hardness and wear resistance needed for production threading in ferrous and non-ferrous materials. It is a standard import-grade tool suited for use in manual tap handles, tap wrenches, or CNC tapping cycles on light machine setups.

This tap covers the 4-40 thread standard, a fine unified national coarse (UNC) designation common in small-fastener applications such as electronics enclosures, instrument panels, and precision assemblies. It is appropriate for through-hole tapping in sheet metal, aluminum, brass, mild steel, and similar materials. Machinists, tool-and-die makers, maintenance technicians, and production operators typically deploy this size in benchtop drill press work or hand-tapping fixtures where small thread profiles are required.

Key Features

• 4-40 thread form for small-fastener and fine-pitch applications
• Spiral point geometry pushes chips forward for cleaner through-hole tapping
• HSS construction provides hardness and wear resistance across common workpiece materials
• Plug chamfer style allows entry into through holes and partially started threads
• Compatible with standard tap handles, T-wrenches, and CNC tapping attachments

Compatibility

Designed as a standard 4-40 plug tap for use in through-hole tapping operations across common metalworking and fabrication setups. No specific OEM compatibility was provided in the product data.

Installation Notes

Use of proper cutting fluid or tapping oil is recommended to extend tool life and improve thread finish when tapping steel or harder alloys. Always secure the workpiece firmly and align the tap perpendicular to the drilled pilot hole before beginning the cut. Back the tap off periodically to break chips and clear the cutting zone. Handle HSS taps with care to avoid chipping the flutes, as they are brittle under lateral loading.

Technical Specifications

• Thread Size: 4-40
• Material: High-Speed Steel (HSS)
• Tap Style: Spiral Point Plug
• Weight: 0.1 pounds

Standard Information

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