Osg 1005200408 Straight Flute Tap 5/16-18 Unc Bottoming

Product Description

The OSG 1005200408 is a straight flute bottoming tap designed for cutting 5/16-18 UNC internal threads in a machine tapping application. Built from powdered metal with a TiCN coating, this tap delivers hardness and wear resistance suited for high-volume or production environments. It features 4 flutes and a 3B class of fit, producing threads to tight tolerances required in precision assemblies. The H3 thread limit keeps dimensional control consistent across production runs. With a thread length of 1-1/8 inches and an overall length of 2-23/32 inches, it fits standard tap holders and machine spindles used by machinists and maintenance professionals.

This tap is sized and configured for machine tapping operations in both ferrous and non-ferrous materials. Its bottoming chamfer allows threading close to the bottom of blind holes, which is a common requirement in close-tolerance machining work. The TiCN coating reduces friction and extends tool life when tapping aluminum and cast iron, the primary listed material applications. It is appropriate for CNC machining centers, drill presses configured for tapping, and manual tapping machines where right-hand thread cutting is required.

Key Features

• Bottoming chamfer for threading to the bottom of blind holes
• TiCN coating improves wear resistance and reduces friction during cutting
• Powdered metal construction provides consistent hardness throughout the tool
• 4 flutes with H3 thread limit for tight dimensional control on 3B class fits
• Right-hand thread direction, no coolant-through requirement
• Rated for aluminum and cast iron material applications

Compatibility

Designed for machine tapping of 5/16-18 UNC right-hand threads in aluminum and cast iron workpieces. Part of OSG Series 10052.

Installation Notes

This tap is intended for use by machinists and tooling professionals in machine tapping setups. Secure the tap in a properly sized tap holder or collet before operation and confirm spindle speed and feed rate are appropriate for the workpiece material. Always ensure the workpiece is clamped securely and the hole is drilled to the correct tap drill diameter for a 5/16-18 UNC thread before tapping. Inspect the tap for wear or chipping before each use to avoid thread damage or tool breakage.