Osg 1654501308 Spiral Flute Tap 5/8-11 Unc 3 Flute

Product Description

The OSG 1654501308 is a spiral flute tap designed for cutting right-hand internal threads in a 5/8-11 UNC configuration. Built from powdered metal and finished with a V coating, this tap handles demanding threading operations across a broad range of workpiece materials. The 45-degree helix angle evacuates chips efficiently in blind-hole applications, reducing the risk of chip packing and tap breakage. With an H5 thread limit and a 2B class of fit, it produces threads that meet standard fastener tolerance requirements. Coolant-through capability supports higher feed rates and extended tool life in production environments. Machinists and toolroom professionals use this tap in CNC machining centers and manual tapping setups alike.

This tap is suited for threading blind and semi-blind holes in a wide range of materials including alloy steel, low-carbon steel, medium-carbon steel, high-carbon steel, hardened steel, cast iron, stainless steel, aluminum, and cast aluminum. The semi-bottoming chamfer allows threading close to the bottom of a hole while still providing enough lead to start cleanly. It is a practical choice for job shops and production floors that work across mixed material schedules without changing tap geometry for every job.

Key Features

• 45-degree right-hand spiral flute geometry for efficient upward chip evacuation in blind holes
• V coating improves surface hardness and lubricity, extending tool life in abrasive materials
• Coolant-through design supports high-speed tapping and through-coolant machine spindles
• H5 thread limit with 2B class of fit for standard fastener thread tolerance compliance
• Powdered metal construction provides a balance of toughness and wear resistance
• Semi-bottoming chamfer for threading close to the bottom of a blind hole

Compatibility

Designed as an OEM-style replacement tap for production and toolroom use in machines equipped with a tapping chuck or rigid tapping spindle accepting standard straight-shank taps in the 5/8-11 UNC size range.

Installation Notes

This tap should be installed by a qualified machinist following standard tool-holding procedures for the shank diameter and square drive dimensions. Ensure the machine spindle or tapping head is powered down and secured before changing tooling. Use the appropriate tap chuck or collet that matches the shank diameter to prevent runout. Verify coolant lines are connected and flowing before initiating coolant-through tapping cycles.