Value Collection 82602 Spiral Point Tap 4-40 Unc Hss-e

Product Description

The VALUE COLLECTION 82602 is a spiral point tap designed for through-hole threading operations in a wide range of ferrous materials. Built from High-Speed Steel-E (HSS-E), this tap delivers the added toughness and heat resistance needed when cutting threads in demanding workpiece materials. It features a 4-40 UNC thread profile, 2 flutes, and a plug chamfer that guides the tap into the hole and distributes cutting forces evenly. A steam oxide coating reduces friction and helps resist corrosion during storage and use. With a Thread Limit of H3, it is suited for standard tolerance threading applications. Machinists, tool and die technicians, and maintenance tradespeople commonly use this tap in both manual and machine tapping setups.

This tap is intended for through-hole threading in materials including stainless steel, alloy steel, cast steel, die steel, and cast iron. The spiral point design pushes chips forward ahead of the cutting flutes, making it well-suited for through-holes where chip evacuation is not restricted. At 4-40 UNC, it handles fine fastener threading common in instrumentation, electronics enclosures, small mechanical assemblies, and light-duty structural connections. Right-hand thread direction is standard for conventional fastener applications.

Key Features

• HSS-E construction provides increased toughness and wear resistance compared to standard HSS
• Steam oxide coating reduces friction and provides light corrosion resistance
• Spiral point geometry pushes chips forward, optimizing performance in through-hole applications
• Plug chamfer (3-5 threads) allows easy starting in a pre-drilled hole
• H3 thread limit suits standard tolerance fits for 4-40 UNC fasteners
• Right-hand thread direction for conventional tapping operations

Compatibility

Designed for through-hole threading in stainless steel, alloy steel, cast steel, die steel, and cast iron workpieces. Suitable for use with standard 4-40 UNC tapping operations in manual tap handles or machine tapping applications where coolant-through tooling is not required.

Installation Notes

This tap is installed by machinists or maintenance technicians using a standard tap wrench or tapping head. Always use the correct tap drill size for 4-40 UNC before starting the tap to avoid overloading the flutes. Apply cutting fluid appropriate to the workpiece material, particularly when working with stainless or alloy steels. Do not force the tap if resistance increases unexpectedly, as HSS-E tooling can fracture under excessive torque.