Osg 1972002 Straight Flute Tap M12x1.75 Metric Coarse 6H Hss

Product Description

The OSG 1972002 is a straight flute bottoming tap designed for cutting metric coarse internal threads in a wide range of ferrous and non-ferrous materials. It produces M12x1.75 threads to a 6H class of fit, delivering consistent dimensional accuracy for precision fastener applications. The tap is manufactured from high-speed steel and features 4 flutes with a right-hand thread direction. Its bottoming chamfer allows threading close to the bottom of blind holes, making it well suited for applications where thread depth is critical. Overall length is 3.375 inches with a thread length of 1.656 inches. A D6 thread limit designation supports proper fit when tapping medium-tolerance threaded assemblies.

This tap is used in machine shop, toolroom, and production environments where metric fastener threads must be cut into blind or through holes. It is appropriate for manual tapping and machine tapping operations on aluminum, cast aluminum, cast iron, low-carbon steel, medium-carbon steel, and high-carbon steel workpieces. The bottoming chamfer geometry makes it the correct choice when full thread depth must be achieved near the bottom of a blind hole, typically used as the final tap in a tap sequence following a taper or plug tap.

Key Features

• M12x1.75 metric coarse thread form to 6H class of fit for standard tolerance threaded assemblies
• Bottoming chamfer allows threading to within 1-2 thread pitches of the bottom of a blind hole
• High-speed steel construction provides wear resistance across a broad range of workpiece materials
• 4-flute straight flute design suitable for machine and hand tapping operations
• D6 thread limit for controlled fit in standard metric threaded connections
• Right-hand thread direction compatible with standard tapping equipment and tap handles

Compatibility

Rated for use in aluminum, cast aluminum, cast iron, low-carbon steel, medium-carbon steel, and high-carbon steel. Designed as an OEM-style straight flute tap for M12x1.75 metric coarse threaded applications per OSG Series 141.

Installation Notes

Machinists and toolroom technicians should secure the workpiece fully before tapping and ensure the tap is aligned perpendicular to the hole axis to prevent tap breakage. Apply appropriate cutting fluid for the workpiece material to extend tool life and improve thread finish. When used in a blind hole, clear chips frequently to prevent packing at the bottom of the hole. Inspect the tap for wear or chipping before each use and do not apply excessive torque when threading hard materials.