Century Drill Tool 97521 Metric Tap Drill Bit Combo 12.0x1.75

Product Description

The CENTURY DRILL TOOL CO INC 97521 is a metric plug tap and letter drill bit Y combo pack designed for hand cutting thread applications in metal and similar materials. The set covers the 12.0x1.75 metric thread specification, pairing a precision-formed plug tap with a matching Y letter drill bit to deliver consistent, accurate threading from a single package. Threads are precision cut for exact fitment and the tooling is heat treated and tempered to file-hard hardness, extending service life under repeated use. The 2-piece configuration gives machinists, pipefitters, and maintenance technicians everything needed to drill and tap a 12.0x1.75 metric hole in one kit.

This combo pack is suited for hand tapping operations in shop, field, and maintenance environments. It is commonly used when threading bolt holes in steel, aluminum, and cast materials to the M12x1.75 metric coarse thread standard. The letter Y drill bit is sized to produce the correct pre-tap hole diameter for the included 12.0x1.75 plug tap, eliminating the need to source a separate drill bit. Tradespeople working on mechanical equipment, structural assemblies, or repair work will find this kit a practical addition to a tap and die set.

Key Features

• 12.0x1.75 metric plug tap and letter drill bit Y included in one package
• Precision cut threads formed for consistent, exact threading results
• Heat treated and tempered to file-hard condition for extended tool life
• Designed for hand cutting applications
• 2-piece combo pack reduces sourcing of matched drill and tap pairs

Compatibility

Designed for hand tapping of 12.0x1.75 metric coarse thread holes in typical shop and field maintenance applications.

Installation Notes

Use in a properly aligned tap handle to maintain perpendicular thread cutting and prevent tap breakage. Apply cutting fluid appropriate for the workpiece material before and during tapping to reduce heat and extend tap life. Ensure the workpiece is securely clamped before starting the drill and tap sequence. Follow applicable workshop safety practices and wear eye protection when operating rotary cutting tools.