Century Drill Tool Co Inc 97117 3/4x10 Nc Fractional Tap

Product Description

The CENTURY DRILL TOOL CO INC 97117 is a 3/4 inch x 10 National Coarse (NC) fractional hand tap made from carbon steel. It is designed for hand threading work across a variety of materials and produces a Class 2B thread fit. The straight flutes are ground to promote rapid chip removal, keeping the threading process efficient and reducing clogging during use. This tap is well suited for routine maintenance and repair work, particularly for rethreading applications where ultra-high accuracy or tight tolerance threads are not required. A 21/32 inch drill bit is the recommended tap drill size for this thread specification.

This tap is used in general mechanical maintenance, repair, and fabrication scenarios where 3/4 inch x 10 NC threads need to be cut or restored by hand. Typical applications include rethreading damaged fastener holes in metal fixtures, structural components, and equipment frames. It is appropriate for use in both shop and field environments by machinists, millwrights, pipefitters, and general maintenance tradespeople working with standard fractional fastener sizes.

Key Features

• 3/4 inch x 10 National Coarse (NC) thread specification for standard fractional fastener compatibility
• Carbon steel construction provides adequate hardness for hand tapping common metals and materials
• Straight flutes ground for rapid chip removal and efficient threading performance
• Produces a Class 2B thread fit, suitable for general-purpose maintenance and repair applications
• Recommended tap drill size: 21/32 inch
• Designed specifically for hand threading work, not CNC or power tapping

Compatibility

Designed as a general-purpose fractional hand tap for use wherever a 3/4 inch x 10 NC thread must be cut or restored by hand in a variety of common materials.

Installation Notes

This tap is intended for hand threading only — do not use in power tapping equipment or drill presses at speed, as this may damage the tap or workpiece. Before tapping, drill the pilot hole to 21/32 inch using a properly secured workpiece. Apply cutting fluid appropriate for the material being tapped to reduce friction and extend tap life. Inspect the tap for damage before each use and replace if flutes show signs of wear or chipping.