Osg 1004400 Straight Flute Tap 8-32 Unc Bottoming Hss

Product Description

The OSG 1004400 is a straight flute bottoming tap designed for cutting internal threads in through-holes and blind holes where threads must extend close to the bottom. Ground from high-speed steel with a bright uncoated finish, this tap produces right-hand 8-32 UNC threads with 4 flutes. The bottoming chamfer - typically 1 to 2 thread leads - allows threading into the full depth of a blind hole after a taper or plug tap has started the thread. The H1 thread limit designation indicates a tight tolerance fit, keeping the tapped thread close to the nominal pitch diameter. Overall length is 2.125 inches with a thread length of 0.469 inches.

This tap is suited for low-volume production and maintenance work in machine shops, tool rooms, and field repair environments. It is appropriate for use in aluminum, cast aluminum, cast iron, low-carbon steel, medium-carbon steel, and high-carbon steel. The 8-32 UNC size is a common fastener standard found in electrical panels, electronic enclosures, light mechanical assemblies, and general fabrication work. It is typically installed in a tap wrench, hand-tapping fixture, or low-speed machine spindle.

Key Features

• Bottoming chamfer for threading to the bottom of blind holes
• 4 straight flutes for use in a range of ferrous and non-ferrous materials
• H1 thread limit for close-tolerance fit near nominal pitch diameter
• High-speed steel construction for durability across general-purpose applications
• Bright uncoated finish - no coating buildup to affect thread tolerance
• Right-hand thread direction, Series 102

Compatibility

Designed as an OEM-style hand or machine tap for general-purpose internal thread cutting in materials including aluminum, cast aluminum, cast iron, low-carbon steel, medium-carbon steel, and high-carbon steel where an 8-32 UNC bottoming tap is required.

Installation Notes

This tap should be installed in a calibrated tap wrench or low-speed tapping machine - hand-tapping is common for repair and one-off work. Always use cutting fluid appropriate to the workpiece material to extend tap life and improve thread quality. Ensure the correct tap drill size for 8-32 UNC is used before tapping. When tapping blind holes, clear chips frequently to prevent tap breakage.