Century Drill Tool Co Inc 96101 4-40 Nc Hex Threading Die

Product Description

The CENTURY DRILL TOOL CO INC 96101 is a 4-40 national coarse hex threading die designed for hand cutting external threads on machine screws and small-diameter fasteners. The die features precision-cut threads that are accurately formed to produce consistent, exact threading results on each pass. It is heat treated and tempered to achieve file-hard thread faces, which extends service life under repeated use. The hex body measures 1 inch across the flats, making it compatible with standard die stocks and holders used in bench and hand threading work. This is a package of 2 dies.

This die is suited for threading 4-40 NC fasteners in light manufacturing, repair, and maintenance applications. It is commonly used by machinists, maintenance technicians, and skilled tradespeople who need to cut or restore external threads on small machine screws. The hand-cutting design makes it appropriate for low-volume threading tasks where a threading machine is not required. It performs well in shop environments for both new thread cutting and chasing damaged threads on existing hardware.

Key Features

• 4-40 national coarse thread specification for small machine screw applications
• Precision-formed threads deliver consistent, exact thread profiles
• Heat treated and tempered for file-hard thread faces and extended service life
• Hex body at 1 inch across the flats fits standard die stocks and holders
• Designed for hand cutting applications — no threading machine required
• Sold as a package of 2 dies

Compatibility

Designed as a hand-threading die for 4-40 national coarse machine screw applications; fits standard 1-inch hex die stocks and holders used in bench threading work.

Installation Notes

Thread cutting with a hex die is typically performed by machinists or maintenance tradespeople using a die stock or tap-and-die wrench. Secure the workpiece firmly before beginning. Apply cutting oil to the die and workpiece to reduce heat and improve thread finish during the cutting pass. Reverse the die periodically to clear chips and prevent thread damage.