Osg 1012400 Straight Flute Tap 4-48 Unf Hss Taper

Product Description

The OSG 1012400 is a straight flute tap designed for cutting internal threads in a 4-48 UNF thread pattern. It features a taper chamfer for easy thread starting and is machined from high-speed steel with a bright, uncoated finish. The tap runs a 3-flute design with a right-hand thread direction, a 2B class of fit, and an H2 thread limit. Overall length is 1-7/8 inches with a thread length of 9/16 inches. It is a standard tool for machinists and maintenance technicians working with fine-thread fastener applications in metal fabrication and equipment repair environments.

This tap is suited for threading operations in aluminum, cast aluminum, cast iron, high-carbon steel, low-carbon steel, and medium-carbon steel workpieces. The taper chamfer makes it a practical choice for through-hole applications where thread starting by hand or machine is required. The 4-48 UNF designation targets fine-pitch fastener work common in instrumentation, small mechanical assemblies, and precision equipment maintenance. It is compatible with standard tap handles and tapping machines that accept the corresponding shank diameter.

Key Features

• 4-48 UNF thread form with taper chamfer for controlled thread entry
• 3-flute straight flute design suitable for through-hole and short blind-hole tapping
• High-speed steel construction provides durability across a range of ferrous and non-ferrous materials
• Bright uncoated finish - compatible with cutting fluids and oils for extended tool life
• H2 thread limit and 2B class of fit for standard tolerance thread production
• Right-hand thread direction; no coolant-through requirement

Compatibility

Designed for use in aluminum, cast aluminum, cast iron, high-carbon steel, low-carbon steel, and medium-carbon steel. Part of OSG Series 102 straight flute taps.

Installation Notes

Machining technicians should secure the workpiece and align the tap perpendicular to the drilled pilot hole before beginning thread cutting. Power down or disengage the tapping machine before changing tooling. Use an appropriate cutting fluid for the workpiece material to reduce heat buildup and extend tap life. Follow shop safety procedures and applicable OSHA machining standards when operating tapping equipment.