Osg 1206602 Spiral Point Tap 4-48 Unf Hss

Product Description

The OSG 1206602 is a spiral point tap designed for cutting internal 4-48 UNF threads in a wide range of metals. Built from high-speed steel and coated with elektraLUBE, it delivers consistent thread quality and extended tool life in production and maintenance environments. The plug chamfer eases entry into through-holes, while the 2-flute spiral point design pushes chips forward ahead of the cutting action to keep the flutes clear. Thread limit is H2, producing a 2B class of fit. Machinists, toolroom technicians, and maintenance mechanics are the typical users.

This tap is suited for through-hole threading operations on the bench, drill press, or CNC machining center. It handles a broad material range including aluminum, cast aluminum, cast iron, low-carbon steel, medium-carbon steel, high-carbon steel, and hardened steel. The 4-48 UNF thread form is common in small mechanical assemblies, instrument panels, and precision hardware where a fine pitch is required for secure fastening in tight quarters.

Key Features

• 4-48 UNF thread form with 2B class of fit for standard tolerance internal threads
• High-speed steel construction provides toughness across a wide material range
• elektraLUBE coating reduces friction and heat buildup during cutting
• Spiral point (gun tap) geometry pushes chips forward, ideal for through-holes
• Plug chamfer with H2 thread limit for controlled oversize and reliable fit
• Right-hand cut, 2 flutes, 9/16 inch thread length

Compatibility

Designed for through-hole tapping in aluminum, cast aluminum, cast iron, low-carbon steel, medium-carbon steel, high-carbon steel, and hardened steel. Follows Series 105 specifications for 4-48 UNF spiral point taps with H2 thread limit and 2B class of fit.

Installation Notes

Use in a rigid tapping setup or floating tap holder to maintain axial alignment and prevent thread damage. Apply cutting fluid appropriate to the workpiece material even when an elektraLUBE coating is present, particularly when tapping hardened or high-carbon steels. Ensure the workpiece is securely fixtured before operation. Inspect the tap for wear or chipping regularly, as small-diameter taps are susceptible to breakage if feed rate or alignment is off.