Osg 2993901 Spiral Flute Tap M Thread Modified Bottoming

Product Description

The OSG 2993901 is a spiral flute tap designed for cutting metric internal threads in a wide range of ferrous materials. Built to Series 299 standards, it features a 45-degree helix angle that efficiently evacuates chips upward during the tapping operation, reducing the risk of chip packing in blind holes. The modified bottoming chamfer allows threading close to the bottom of a hole. With a 3-flute right-hand spiral design and a steam oxide finish, this tap delivers consistent thread quality and improved lubricity during cutting. Overall length is 63.5 mm (2.5 inches) with a shank diameter of 6.477 mm (0.255 inches). Weight is 0.015 pounds.

This tap is suited for use in machining operations on alloy steel, carbon steel, cast iron, stainless steel, die steel, and hardened steel workpieces. It is appropriate for production and job shop environments where metric blind-hole threading is required. The D11 thread limit designation indicates it is intended for tapping threads requiring a tighter tolerance class, making it a practical choice for precision threading applications in manufacturing and fabrication settings.

Key Features

• 45-degree right-hand spiral helix angle for efficient upward chip evacuation in blind holes
• Modified bottoming chamfer allows threading close to the bottom of a blind hole
• Steam oxide coating provides improved lubricity and corrosion resistance during cutting
• 3-flute design balances cutting load and chip clearance across multiple ferrous materials
• D11 thread limit for controlled tolerance threading applications
• Metric thread standard with 8 mm thread length and 25.4 mm neck length

Compatibility

Designed as an OEM-style replacement spiral flute tap for metric threading applications in alloy steel, carbon steel, cast iron, stainless steel, die steel, and hardened steel. Verify thread specification and hole depth requirements before installation.

Installation Notes

This tap should be installed and operated by a qualified machinist familiar with tapping procedures and cutting tool safety. Ensure the workpiece is securely fixtured and that the correct tapping speed for the material is set before beginning. Apply appropriate cutting fluid to the tap and workpiece to extend tool life and improve thread quality. Inspect the tap for wear or chipping before each use and do not force a worn or damaged tap.