Century Drill Tool 97506 M4 Tap Drill Bit Combo 2 Piece

Product Description

The CENTURY DRILL TOOL CO INC 97506 is a metric plug-style tap and number 30 drill bit combo pack designed for hand cutting threaded holes in metal and other materials. The set covers M4 thread sizing at a 4.0 x 0.7mm pitch. Threads are precision cut and accurately formed to deliver consistent, repeatable results. The tap and bit are heat treated and tempered to achieve file-hard threads, which extends service life and maintains cutting performance across repeated use. Each package contains 2 pieces and is sold as a single unit.

This combo pack is suited for maintenance technicians, machinists, HVAC service pros, plumbers, and electricians who need to tap clean metric threads in the field or at a bench. The M4 x 0.7 specification is one of the most common metric thread sizes found in equipment panels, brackets, and component housings across HVAC, electrical, and general mechanical applications. The plug-style tap geometry is appropriate for through-hole and most blind-hole hand tapping operations.

Key Features

• M4 x 0.7mm metric plug-style tap for hand cutting applications
• Number 30 drill bit included for correct tap drill sizing
• Precision-cut threads for consistent, exact thread formation
• Heat treated and tempered for file-hard thread cutting edges
• Extended tool life from hardening and tempering process
• 2-piece combo pack — tap and drill bit together in one package

Compatibility

Designed for hand tapping M4 x 0.7mm metric threads in metal, plastic, and similar materials where a plug-style tap and matching drill bit are required.

Installation Notes

Tap and drill bit sets should be used with appropriate tapping fluid or cutting oil when threading metal to reduce heat and extend tool life. Secure the workpiece firmly before drilling and tapping. Follow standard machining practice: drill the pilot hole with the number 30 bit before threading with the tap. Do not force the tap — back it off periodically to clear chips and prevent breakage.