Osg 3110508 Straight Flute Tap 10-32 Unf Solid Carbide

Product Description

The OSG 3110508 is a straight flute machine tap designed for cutting 10-32 UNF internal threads in hardened steel. Built from solid carbide with a V finish coating, it delivers the hardness and wear resistance needed to hold tolerances in difficult materials. The modified bottoming chamfer allows threading close to the bottom of a blind hole. With 4 flutes and a 2B class of fit, it produces threads that meet standard UNF tolerance requirements. Overall length is 2.756 inches (70.00 mm) and thread length is 0.5 inches. This tap is intended for use by machinists and toolroom professionals in production or maintenance settings.

The OSG 3110508 is suited for machine tapping operations in CNC machining centers, drill presses, and tapping machines where rigid tapping or controlled feed is used. Its primary application is threading hardened steel workpieces where high-speed steel tooling falls short. Right-hand thread direction makes it compatible with standard spindle rotation. The modified bottoming chamfer is especially useful when thread engagement must extend near the floor of a blind hole, a common requirement in close-tolerance fixture and tooling work.

Key Features

• Solid carbide construction for threading hardened steel where HSS taps fail
• Modified bottoming chamfer for threading near the bottom of blind holes
• 4 straight flutes in a 2B class of fit for standard UNF thread tolerance
• V finish coating for enhanced surface hardness and lubricity
• Right-hand thread direction compatible with standard machine spindle rotation
• No coolant-through design — external coolant or cutting fluid application required

Compatibility

Designed for machine tapping 10-32 UNF threads in hardened steel. Compatible with toolholders accepting a 0.194-inch shank diameter and standard square drive. Specified for OSG Series 311.

Installation Notes

Installation and use should be performed by a qualified machinist. Secure the tap in a rigid holder appropriate for the machine and verify spindle speed and feed rate match the workpiece material and tap geometry before cutting. Apply appropriate cutting fluid to the tap and workpiece throughout the operation. Inspect the tap for chips or edge damage before each use — carbide taps are brittle and can fracture if fed incorrectly or used in a worn holder.