Guhring 9039020028450 Spiral Point Tap 4-48 Unf

Product Description

The GUHRING 9039020028450 is a spiral point tap designed for through-hole threading in steel and similar materials. Built from HSS-E cobalt high-speed steel, it delivers added heat and wear resistance compared to standard HSS tooling. The plug chamfer distributes cutting load across the leading threads for reliable thread initiation. With a 4-48 UNF thread form, 3 flutes, and a 2B class of fit, this tap produces clean, dimensionally consistent internal threads in small-diameter applications. Machinists and maintenance technicians reach for this tap when precision threaded holes are required in ferrous metals at fine pitch.

This tap is suited for through-hole threading operations on small fastener threads in the 4-48 UNF specification. It performs in production and maintenance environments where consistent thread quality in steel is critical. The spiral point geometry pushes chips forward ahead of the tap, making it especially well suited for through-hole work in CNC machining centers, drill presses, and hand-tapping fixtures. The right-hand thread direction and H2/H3 thread limit make it compatible with standard 2B tolerance requirements.

Key Features

• HSS-E cobalt construction provides enhanced hardness and heat resistance for tapping steel
• Spiral point geometry pushes chips forward, reducing chip packing in through-hole applications
• Plug chamfer distributes cutting load gradually for smooth thread entry
• 3 flutes with H2/H3 thread limit ensure 2B class of fit compliance
• Bright/uncoated finish allows visual wear inspection during service life
• Right-hand thread direction for standard drive compatibility

Compatibility

Designed for through-hole threading of 4-48 UNF internal threads in steel applications, conforming to 2B class of fit tolerances per Series 3902.

Installation Notes

This tap is installed and operated by machinists or maintenance technicians using a standard tap wrench, tapping head, or CNC rigid tapping cycle. Before tapping, ensure the workpiece is secured and the pilot hole diameter matches the recommended tap drill size for 4-48 UNF. Use an appropriate cutting fluid for steel to extend tool life and improve thread finish. Never reverse a spiral point tap under load without confirming chip clearance ahead of the flutes.