Osg 1124902 Straight Flute Tap 3/4-10 Unc Plug Hss

Product Description

The OSG 1124902 is a straight flute plug tap designed for cutting right-hand internal threads in a range of ferrous and non-ferrous materials. Built from high-speed steel, it carries a 3/4-10 UNC thread form with a plug chamfer, which provides a gradual lead-in suited for through-hole tapping. The tap runs 4.25 inches overall with a 2-inch thread length, features 4 flutes for chip evacuation, and holds an H3 thread limit for consistent thread tolerance across production runs. Licensed machinists, toolroom operators, and maintenance mechanics reach for this tap when a reliable, standard-geometry UNC tap is required.

The OSG 1124902 is intended for general-purpose tapping operations in both manual and machine setups. Its plug chamfer makes it suitable for through holes where full thread engagement is needed before the chamfer exits the work. The H3 limit and 4-flute straight flute geometry support use in a range of ferrous and non-ferrous base materials. This tap is sold individually and is part of the OSG Series 101 line.

Key Features

• 3/4-10 UNC thread form, right-hand cut
• Plug chamfer for through-hole applications with gradual thread lead-in
• 4 straight flutes for chip clearance in general-purpose materials
• H3 thread limit for consistent tolerance control
• High-speed steel construction for durability across a broad material range
• No coolant-through requirement, compatible with conventional flood or manual lubrication

Compatibility

Rated for use in aluminum, cast aluminum, cast iron, high-carbon steel, low-carbon steel, and medium-carbon steel. Fits standard 3/4-inch tap holders and driver chucks sized for the corresponding shank geometry.

Installation Notes

Install in a rigid or floating tap holder matched to the shank size and secure workpieces in a vise or fixture before tapping. Apply a compatible cutting fluid appropriate to the workpiece material to reduce heat and extend tool life. Always back the tap out periodically to break and clear chips, particularly in deeper holes. Follow applicable shop safety and machinery operating procedures when running this tap under power.