Osg 22612 M4x0.70 Metric Coarse Straight Flute Tap

Product Description

The OSG 22612 is a straight flute tap designed for cutting internal metric coarse threads in a wide range of workpiece materials. Built from high-speed steel with an oxide coating, this tap produces M4x0.70 threads in bottoming applications where threads must extend close to the bottom of a blind hole. The bottoming chamfer provides 1 to 2 threads of lead-in, making it suited for situations where through-tap or plug tap access is insufficient. With 3 flutes and a 2B class of fit, it delivers clean thread geometry suitable for precision assembly work. Overall length is 52 mm (approximately 2.05 inches) and thread length is 13 mm (approximately 0.51 inches).

This tap is used in machining, maintenance, and repair operations where metric fastener threads must be cut by hand or with a tapping attachment. Typical applications include tapping blind holes in aluminum, cast aluminum, cast iron, low-carbon steel, medium-carbon steel, and high-carbon steel components. The straight flute design is well suited for short-chipping materials where chip evacuation through the flute is reliable. It fits standard tap wrenches and tapping heads sized for a 5 mm shank diameter.

Key Features

• Bottoming chamfer for threading close to the bottom of blind holes
• High-speed steel construction for durability across a range of workpiece materials
• Oxide coating reduces friction and provides basic corrosion resistance during storage and use
• 3-flute straight design suited for short-chipping materials including cast iron and steel
• 2B class of fit for standard metric fastener thread tolerances
• Right-hand thread direction, no coolant-through design

Compatibility

The OSG 22612 is part of OSG Series 121 and is compatible with workpiece materials including aluminum, cast aluminum, cast iron, low-carbon steel, medium-carbon steel, and high-carbon steel. It is designed for use in standard tap wrenches or tapping attachments that accept a 5 mm shank diameter.

Installation Notes

This tap is installed by machinists and maintenance technicians using a tap wrench or tapping attachment. Ensure the workpiece is securely fixtured and the pilot hole diameter is correctly sized for M4x0.70 threads before tapping begins. Apply appropriate cutting fluid for the workpiece material to reduce heat and extend tool life. Avoid forcing the tap — back it off periodically to break chips and prevent binding, especially when working near the bottom of a blind hole.