Osg 1068102 Straight Flute Tap 6-40 Unf 2 Flute Plug Hss

Product Description

The OSG 1068102 is a straight flute plug tap designed for threading 6-40 UNF holes in a wide range of metals. Manufactured from high-speed steel, it delivers consistent thread quality in both through-hole and blind-hole applications where chip clearance is manageable. The plug chamfer - typically 3 to 5 threads - allows the tap to start easily while progressively cutting a full thread form. With a 2-flute design and H2 thread limit, it holds tight tolerances suitable for 2B and 3B class-of-fit requirements. Licensed machinists, toolroom techs, and maintenance mechanics reach for this tap when producing standard inch-series threads in production or repair work.

This tap is suited for threading operations in aluminum, cast aluminum, cast iron, low-carbon steel, medium-carbon steel, and high-carbon steel. At 2 inches overall length with an 11/16-inch thread length, it fits standard tap handles and machine spindles used in drill press, CNC, and manual tapping applications. The right-hand thread direction matches conventional tapping setups without requiring reverse-drive tooling.

Key Features

• 6-40 UNF thread form, right-hand direction, H2 thread limit
• 2B and 3B class-of-fit tolerance for both standard and close-fit thread applications
• High-speed steel construction for durability across a broad range of workpiece materials
• 2-flute straight flute geometry suitable for through-hole and short blind-hole tapping
• Plug chamfer for easy entry and progressive thread engagement
• 11/16-inch thread length provides adequate depth for typical fastener engagement

Compatibility

Designed for use in aluminum, cast aluminum, cast iron, high-carbon steel, low-carbon steel, and medium-carbon steel workpieces requiring 6-40 UNF threaded holes to 2B or 3B class-of-fit standards.

Installation Notes

Tapping operations should be performed with appropriate cutting fluid matched to the workpiece material - sulfurized oil for ferrous metals and a light lubricant or kerosene for aluminum. Secure the workpiece firmly before starting and ensure the tap is aligned perpendicular to the work surface to avoid tap breakage or thread distortion. For machine tapping, set spindle speed appropriate to material and tap diameter per published feeds-and-speeds references. Worn or broken taps should be replaced rather than reused to maintain thread quality and avoid workpiece damage.