Osg 1630001 Spiral Point Tap 1/4-20 Unc 2 Flute Plug Hss

Product Description

The OSG 1630001 is a spiral point tap designed for threading 1/4-20 UNC holes in a wide range of metallic materials. Manufactured from high-speed steel with a steam oxide coating, it features a plug chamfer and an H3 thread limit, making it well suited for through-hole tapping applications where the spiral point pushes chips ahead of the tap and out of the hole. The 3B class of fit produces threads appropriate for most standard fastener assemblies. With a 2-flute configuration and right-hand thread direction, this tap is a dependable shop-floor choice for machinists and maintenance technicians working in production and repair environments.

This tap is applied in through-hole tapping operations across aluminum, cast aluminum, cast iron, low-carbon steel, medium-carbon steel, high-carbon steel, and hardened steel. The plug chamfer provides gradual thread engagement, reducing torque requirements on entry and making it practical for both machine tapping and hand tapping setups. It is commonly used in job shops, maintenance facilities, and light manufacturing where 1/4-20 UNC is a frequently specified thread size.

Key Features

• Spiral point geometry pushes chips forward in through-hole applications, reducing clogging
• High-speed steel construction provides toughness across a broad range of workpiece materials
• Steam oxide coating improves lubricity and reduces friction during cutting
• H3 thread limit ensures consistent 3B class of fit for standard fastener assemblies
• Plug chamfer allows gradual thread engagement, suitable for both machine and hand tapping
• Right-hand thread direction compatible with standard tapping equipment and toolholders

Compatibility

Designed for through-hole tapping of 1/4-20 UNC threads; compatible with aluminum, cast aluminum, cast iron, low-carbon steel, medium-carbon steel, high-carbon steel, and hardened steel workpieces. Series 105A.

Installation Notes

Install in a standard tapping chuck or rigid toolholder rated for the machine spindle in use. Power down or deactivate the machine before changing tooling. Apply an appropriate cutting fluid or tapping compound for the workpiece material to extend tool life and improve thread quality. Follow shop safety practices and applicable OSHA standards when operating tapping equipment.