Osg 1073400 Straight Flute Tap 8-32 Unc Plug 2B Hss

Product Description

The OSG 1073400 is a straight flute tap designed for cutting internal threads in a variety of ferrous and non-ferrous materials. It produces right-hand 8-32 UNC threads to a 2B class of fit, making it a standard choice for machine screws and fastener applications across production and maintenance work. The tap is manufactured from high-speed steel with a bright, uncoated finish and features two straight flutes with a plug chamfer. Overall length is 2.125 inches, with a 0.75-inch thread length, a 0.168-inch shank diameter, and an H3 thread limit for consistent tolerance control. Machinists and maintenance technicians use this tap in drill press, CNC, and hand-tapping operations.

This tap is suited for through-hole and shallow blind-hole applications where chip evacuation flows back through the flutes. Straight flute geometry performs reliably in a wide range of materials. The plug chamfer - typically 3 to 5 threads of taper - allows the tap to start in a pre-drilled hole without requiring a starter tap, streamlining the threading sequence in production environments. It is appropriate for use in machine tapping with cutting fluid applied to extend tool life and maintain thread quality.

Key Features

• 8-32 UNC thread form, right-hand direction, 2B class of fit
• H3 thread limit for close dimensional control
• Plug chamfer for direct entry into pre-drilled through or shallow blind holes
• Two straight flutes suitable for a broad range of workpiece materials
• High-speed steel construction with bright, uncoated finish
• No coolant-through requirement - compatible with external cutting fluid application

Compatibility

Rated for use in aluminum, cast aluminum, cast iron, high-carbon steel, low-carbon steel, and medium-carbon steel. Part of OSG Series 104.

Installation Notes

This tap is installed by machinists and toolmakers using standard tap holders, tapping heads, or CNC rigid-tap cycles. Secure the workpiece before tapping and ensure the pilot hole is drilled to the correct tap-drill diameter for 8-32 UNC. Apply an appropriate cutting fluid for the workpiece material to reduce friction and extend tap life. Inspect the tap for chipping or wear before each use - a damaged tap can seize in the hole and destroy the workpiece thread.