Osg 12800100 Hand Sti Tap M2 X 0.4 Metric Coarse D2

Product Description

The OSG 12800100 is a hand STI tap designed for cutting M2 x 0.4 metric coarse internal threads in a range of ferrous and non-ferrous materials. This 2-flute tap features a modified bottoming chamfer, allowing it to thread closer to the bottom of a blind hole than a standard plug chamfer. Built from high-speed steel with a bright finish, it carries a D2 thread limit and a 6H class of fit, making it suitable for precision thread repair and production tapping applications. Overall length is 1.88 inches with a thread length of 0.56 inches.

This tap is used in machine shops, maintenance facilities, and field repair settings where M2 metric coarse threads need to be cut or restored. The modified bottoming chamfer makes it particularly useful in confined blind-hole applications where maximum thread engagement depth is required. It is appropriate for use in aluminum, cast iron, high-carbon steel, low-carbon steel, and medium-carbon steel workpieces. Machinists and maintenance technicians working on small fastener threads in precision assemblies will find this tap well-suited to the task.

Key Features

• M2 x 0.4 metric coarse thread form with D2 thread limit and 6H class of fit
• Modified bottoming chamfer for threading close to the bottom of blind holes
• 2-flute geometry suited for small-diameter tapping and chip clearance
• High-speed steel construction provides durability across a range of workpiece materials
• Bright finish with no coating — suitable for use with cutting fluids as needed
• Compact 1.88-inch overall length designed for tight-access tapping

Compatibility

Designed for cutting M2 x 0.4 metric coarse threads in aluminum, cast iron, high-carbon steel, low-carbon steel, and medium-carbon steel. Part of the OSG Series 128 STI tap line.

Installation Notes

Installation is performed by machinists or maintenance technicians using a standard tap wrench or appropriate hand-tapping fixture. Ensure the workpiece is securely fixtured and the tap is started square to the hole to avoid tap breakage at this small diameter. Apply a suitable cutting fluid for the workpiece material before and during tapping. Disconnect or lock out any power to the workpiece assembly before performing thread repair on installed components.