Osg 1019900 Straight Flute Tap 8-32 Unc Bottoming Hss

Product Description

The OSG 1019900 is a straight flute bottoming tap designed for threading 8-32 UNC holes in a wide range of ferrous and non-ferrous metals. With 3 flutes and a bottoming chamfer, it cuts threads to the bottom of blind holes where standard or plug taps cannot reach. Made from high-speed steel (HSS) with a bright uncoated finish, this tap is suited for manual and machine tapping operations. The H7 thread limit designation indicates a slightly oversized tap for use with standard tolerances in production and maintenance environments. Overall length is 2.125 inches with a thread length of approximately 0.47 inches.

This tap is intended for use in machine shops, maintenance facilities, and production environments where blind-hole threading in common metals is required. Material compatibility includes aluminum, cast aluminum, cast iron, high-carbon steel, low-carbon steel, and medium-carbon steel. It is appropriate for both hand tapping and light machine tapping setups where a bottoming profile is necessary to achieve full thread depth in shallow or blind holes.

Key Features

• Bottoming chamfer for threading to the bottom of blind holes
• 3 straight flutes for chip clearance in short-chipping materials
• High-speed steel construction for durability across common metal applications
• H7 thread limit for standard production tolerances with slight oversize allowance
• Bright uncoated finish suitable for use with cutting fluids or tapping compounds
• Right-hand thread direction, 8-32 UNC specification

Compatibility

Compatible with aluminum, cast aluminum, cast iron, high-carbon steel, low-carbon steel, and medium-carbon steel. Designed as a standard 8-32 UNC bottoming tap for use in applications requiring full thread depth in blind holes per Series 102 specifications.

Installation Notes

This tap should be installed and operated by a machinist or qualified tradesperson familiar with tapping operations. Before use, secure the workpiece and ensure the tap is properly aligned to avoid cross-threading or breakage. Apply an appropriate cutting fluid or tapping compound for the workpiece material to extend tap life and improve thread quality. Never force a tap into a hole that is undersized - verify drill size against standard 8-32 UNC tap drill charts before threading.