Value Collection JY4838405 Straight Flute Tap 10-40 Uns

Product Description

The VALUE COLLECTION JY4838405 is a straight flute tap designed to cut internal 10-40 UNS threads in a wide range of materials. Built from high-speed steel (HSS) with a bright/uncoated finish, this tap delivers reliable thread-cutting performance in general machining and repair applications. The plug chamfer style — with approximately 3 to 5 chamfered threads at the lead — suits through-holes and moderately deep blind holes where standard entry conditions apply. At 2.375 inches overall length, the tap fits standard tap wrench and machine setups used by machinists, tool-and-die workers, and maintenance technicians working on fine-thread fastener applications.

This tap is suited for threading operations requiring a 10-40 UNS thread form, a less common thread standard used in specialized instrument, optical, and mechanical assembly work. The 4-flute design provides good chip support and thread guidance, making it appropriate for use in hand tapping or light-duty machine tapping on ferrous and non-ferrous metals. Right-hand thread direction matches standard 10-40 UNS fastener orientation. The H2 thread limit designation indicates a controlled pitch diameter tolerance for achieving a 3B class of fit, which is the standard free fit for most commercial threading applications.

Key Features

• 10-40 UNS thread form with H2 thread limit for 3B class of fit
• High-speed steel construction for durability across a range of work materials
• Plug chamfer lead — approximately 3 to 5 chamfered threads — for versatile through-hole and blind-hole use
• 4-flute straight flute geometry for stable chip control and consistent thread form
• Bright/uncoated finish suitable for use with cutting fluids in standard tapping operations
• Right-hand thread direction; no coolant-through feature

Compatibility

Designed as a direct-cutting tool for 10-40 UNS internal threads in applications requiring a 3B class of fit with H2 thread limit tolerance.

Installation Notes

This tap is installed by machinists or maintenance technicians using a tap wrench or compatible machine tapping setup. Always ensure the workpiece is properly secured and the pilot hole is drilled to the correct tap drill diameter for a 10-40 UNS thread before tapping. Apply appropriate cutting fluid to reduce heat and extend tool life. Reverse the tap periodically when hand tapping to break chips and prevent binding.