Osg 1231201 Spiral Point Tap 5/16-24 Unf 2 Flute Hss

Product Description

The OSG 1231201 is a spiral point tap designed for cutting internal threads in through-hole applications. It features a 5/16-24 UNF thread form with a plug chamfer, allowing it to start easily and drive chips forward out of the hole during tapping. Manufactured from high-speed steel with a steam oxide coating, it delivers reliable performance across a wide range of workpiece materials. The 2-flute design and right-hand thread direction make it suited for general production and maintenance tapping work performed by machinists and tooling professionals.

This tap is intended for use in through-hole threading operations where chip evacuation ahead of the tap is acceptable. Its H3 thread limit classification makes it appropriate for applications requiring a standard tolerance fit. The 3B class of fit aligns with typical fastener and mechanical assembly requirements. Compatible material applications include aluminum, cast aluminum, cast iron, low-carbon steel, medium-carbon steel, high-carbon steel, and hardened steel, making it a versatile choice across job shop and production environments.

Key Features

• 5/16-24 UNF thread form with plug chamfer for through-hole tapping
• Spiral point geometry drives chips forward, reducing chip packing in the hole
• High-speed steel construction for durability across ferrous and non-ferrous materials
• Steam oxide coating provides corrosion resistance and mild lubricity
• H3 thread limit with 3B class of fit for standard tolerance threading
• Right-hand thread direction for conventional tapping operations

Compatibility

Suitable for threading through-holes in aluminum, cast aluminum, cast iron, low-carbon steel, medium-carbon steel, high-carbon steel, and hardened steel workpieces requiring a 5/16-24 UNF thread.

Installation Notes

This tap should be installed in a compatible tap holder or tapping attachment and used with appropriate cutting fluid for the workpiece material. Power down and secure any machine before changing tooling. Follow standard machining practices and applicable shop safety protocols when operating tapping equipment. Do not use in blind holes where chip evacuation forward is not possible, as the spiral point design is intended for through-hole applications only.