Osg 1008900 Straight Flute Tap 3/4-10 Unc Plug Hss

Product Description

The OSG 1008900 is a straight flute plug tap designed for cutting internal 3/4-10 UNC right-hand threads in a range of ferrous and non-ferrous materials. Built from high-speed steel (HSS) with a bright, uncoated finish, it delivers consistent thread form across general-purpose tapping applications. The plug chamfer - typically 3 to 5 threads - allows for easy starting in through-holes and blind holes with sufficient depth. With 4 flutes and an H1 thread limit, the tap holds tight tolerance and is suited for production and maintenance threading work performed by machinists and tool-and-die professionals.

This tap is intended for tapping operations in aluminum, cast aluminum, cast iron, low-carbon steel, medium-carbon steel, and high-carbon steel. It fits standard tap holders, tapping heads, and CNC machine spindles that accept 3/4-10 tooling. The straight flute design works best in shorter-chipping materials where flute packing is not a concern. It is well suited for both manual tapping and machine tapping setups in job shop, maintenance, and light production environments.

Key Features

• 3/4-10 UNC thread form with right-hand thread direction
• Plug chamfer for easy thread entry in through-holes and adequately deep blind holes
• 4 straight flutes for rigidity and support in short-chipping materials
• H1 thread limit for close-tolerance thread production
• High-speed steel construction for durability across a range of common workpiece materials
• Bright, uncoated finish - no additional coating variables affecting tap-hole sizing

Compatibility

Designed as a standard replacement or production straight flute plug tap for 3/4-10 UNC threading applications in aluminum, cast aluminum, cast iron, low-carbon steel, medium-carbon steel, and high-carbon steel workpieces.

Installation Notes

Secure the workpiece fully before tapping and ensure the tap is aligned perpendicular to the work surface to prevent thread lead errors. Power down and de-energize any machine tool before installing or removing the tap from the holder. Use appropriate cutting fluid for the workpiece material - sulfurized oil for steels, a light cutting fluid for aluminum. Do not force a tap that has stopped advancing; back off to clear chips before continuing.