Osg 1972500 Straight Flute Tap M3.5x0.60 Metric Coarse

Product Description

The OSG 1972500 is a straight flute hand tap designed for cutting internal metric coarse threads in a variety of ferrous and non-ferrous materials. Built from high-speed steel with a bright uncoated finish, it cuts M3.5x0.60 threads to a 6H class of fit and carries a D4 thread limit for consistent dimensional accuracy. The plug chamfer provides a balance between starting ease and thread engagement depth, making it well suited for through-holes and moderately deep blind holes. With an overall length of 2 inches and a thread length of 11/16 inches, this compact tap is handled by machinists, tool and die makers, and maintenance mechanics on production and repair work alike.

This tap is intended for tapping M3.5x0.60 metric coarse threads in aluminum, cast aluminum, cast iron, high-carbon steel, low-carbon steel, and medium-carbon steel. Its three-flute straight design provides good chip clearance in these materials under conventional tapping conditions. It is appropriate for manual tapping and low-speed machine tapping setups where straight flute geometry is preferred. The tap is sold individually and is sized for applications common in light manufacturing, assembly, and general maintenance environments where small-diameter metric fasteners are used.

Key Features

• M3.5x0.60 metric coarse thread form, 6H class of fit for standard tolerance threading
• D4 thread limit for controlled oversize allowance compatible with 6H fit requirements
• Plug chamfer style balances starting ease with thread engagement in through-holes and moderate blind holes
• High-speed steel construction provides toughness across a range of workpiece materials
• Bright uncoated finish is suitable for use with cutting fluids on aluminum, cast iron, and carbon steel
• Straight flute geometry supports manual and low-speed machine tapping applications

Compatibility

Designed for cutting M3.5x0.60 metric coarse internal threads in aluminum, cast aluminum, cast iron, high-carbon steel, low-carbon steel, and medium-carbon steel workpieces.

Installation Notes

Power down or secure any machine tapping setup before installing or changing taps. Use an appropriate cutting fluid or tapping compound matched to the workpiece material to extend tool life and improve thread quality. Ensure the tap is started perpendicular to the workpiece surface to avoid thread misalignment. Follow applicable shop safety practices and manufacturer guidance for speed and feed when using this tap in a machine setup.