Osg 1973500 Straight Flute Tap M8x1.00 Metric Fine Hss

Product Description

The OSG 1973500 is a straight flute tap designed for cutting M8x1.00 metric fine internal threads in a range of ferrous and non-ferrous metals. Built from high-speed steel with a bright/uncoated finish, it features a bottoming chamfer that allows threading close to the bottom of a blind hole. The tap carries a D5 thread limit, indicating a tolerance class suited for general-purpose threading applications. With 4 flutes and right-hand thread direction, it is intended for use in machine tapping or hand tapping operations where chip clearance is managed by periodic reversal. It weighs 0.05 pounds and has an overall length of 2-23/32 inches.

This tap is suited for threading blind and through holes in aluminum, cast aluminum, cast iron, high-carbon steel, low-carbon steel, and medium-carbon steel. The bottoming chamfer style makes it the correct choice when a through-hole tap or plug tap has already been used to start the thread and full thread depth to the hole bottom is required. It is part of the OSG 141 series and is sold individually. Machinists, tool and die makers, and maintenance technicians working on metric-threaded assemblies will find this tap appropriate for production and repair threading tasks.

Key Features

• Bottoming chamfer for threading close to the bottom of blind holes
• M8x1.00 metric fine thread form for fine-pitch applications requiring greater thread engagement
• High-speed steel construction for durability across a wide range of workpiece materials
• 4 straight flutes suitable for machine or hand tapping with controlled chip management
• D5 thread limit for general-purpose tolerance requirements
• Right-hand thread direction; no coolant-through feature

Compatibility

Designed for cutting M8x1.00 metric fine internal threads in aluminum, cast aluminum, cast iron, high-carbon steel, low-carbon steel, and medium-carbon steel workpieces.

Installation Notes

This tap should be installed and used by machinists or qualified technicians familiar with tapping operations. Always secure the workpiece and ensure the tap is properly aligned to avoid tap breakage, particularly in blind holes. Power down or disengage the machine spindle before changing tooling. When using as a bottoming tap, a plug or taper tap should be used first to establish the thread before finishing with this tool.