Century Drill Tool Co Inc 97119 Plug Tap 7/8-9 Nc

Product Description

The CENTURY DRILL TOOL CO INC 97119 is a 7/8-9 national coarse plug-style machine screw tap designed for cutting internal threads by hand. Heat treated and tempered to file-hard hardness, it delivers consistent, accurate thread formation across repeated use. The plug style features a 3 to 5 thread chamfer, making it the most widely used tap configuration for general threading work. Designed for use with standard tap wrenches, this tap produces threads at 75% thread engagement, a common specification for reliable fastener hold in most materials.

This tap is suited for trade and workshop applications where internal threads must be cut in metal workpieces by hand. Machinists, maintenance technicians, plumbers, and HVAC service techs reach for plug taps when restoring stripped threads or tapping new holes in brackets, housings, and fittings. The 7/8-9 NC size is a heavy coarse-thread designation commonly encountered in structural and mechanical assemblies. Each package contains one tap, sold as an individual unit.

Key Features

• 7/8-9 national coarse thread specification for precise internal thread cutting
• Plug style with 3 to 5 thread chamfer — the most common tap configuration for general use
• Heat treated and tempered to file-hard finish for extended service life
• 75% thread engagement for consistent fastener hold
• Precision-formed threads for accurate, repeatable cuts
• Designed for hand cutting with standard tap wrenches

Compatibility

Designed as a hand-cutting plug tap for use with standard tap wrenches in applications requiring 7/8-9 national coarse internal threads.

Installation Notes

Installation requires a properly sized tap wrench and appropriate cutting fluid to reduce friction and extend tap life. Always secure the workpiece before tapping and ensure the tap enters the hole straight to avoid cross-threading or tap breakage. When restoring existing threads, clear chips frequently by reversing the tap a half-turn for every full turn of advance. Follow applicable shop safety practices when working with hardened cutting tools.