Osg 1206100 Spiral Point Tap 3-48 Unc 2 Flute Hss

Product Description

The OSG 1206100 is a spiral point tap designed to cut 3-48 UNC threads in a wide range of ferrous and non-ferrous materials. Built from high-speed steel with a bright finish, this bottoming chamfer tap is suited for threading operations that require thread engagement close to the bottom of a blind hole. It carries an H2 thread limit and a 2B class of fit, making it appropriate for standard-tolerance fastener applications. With 2 flutes and right-hand thread direction, it is sized for small-diameter work where precision and controlled chip flow matter. Licensed machinists and toolroom technicians are the primary users.

This tap is suited for threading aluminum, cast aluminum, cast iron, low-carbon steel, medium-carbon steel, high-carbon steel, and hardened steel. The bottoming chamfer style makes it a second-operation tool, typically used after a taper or plug tap has started the thread, allowing threads to be cut as close to the bottom of a blind hole as the application requires. It is appropriate for both manual tapping and machine tapping setups in production or repair environments.

Key Features

• Bottoming chamfer for threading close to the bottom of blind holes
• High-speed steel construction for durability across a broad range of workpiece materials
• H2 thread limit and 2B class of fit for standard-tolerance thread production
• Right-hand, 3-48 UNC thread form for compatibility with standard inch-series fasteners
• Bright finish with no coolant-through requirement, suitable for general-purpose use
• 2-flute design supports controlled chip evacuation in small-diameter tapping

Compatibility

Designed to cut 3-48 UNC right-hand threads in aluminum, cast aluminum, cast iron, low-carbon steel, medium-carbon steel, high-carbon steel, and hardened steel workpieces.

Installation Notes

This tap should be installed by a qualified machinist or toolroom technician familiar with small-diameter tapping operations. Power down or disengage the spindle before loading or changing taps in any machine setup. Use a bottoming tap only after a taper or plug tap has already started the thread in blind-hole applications to reduce the risk of tap breakage. Ensure proper alignment and appropriate cutting fluid selection for the workpiece material before operation.