Value Collection MSC-04426409 6-40 Unf Straight Flute Tap Hss

Product Description

The VALUE COLLECTION MSC-04426409 is a straight flute tap designed for cutting 6-40 UNF internal threads in a wide range of materials. Manufactured from high-speed steel (HSS) with a bright/uncoated finish, this tap delivers reliable thread-cutting performance in production and maintenance applications. The plug chamfer style provides 3 to 5 thread lead-in, making it suitable for through-hole and moderately deep blind-hole threading. With 3 flutes and a right-hand thread direction, the tap clears chips effectively during hand tapping and machine tapping operations. Overall length is 2 inches with a thread length of 11/16 inches. The H1 thread limit provides close-tolerance control for precision threaded assemblies.

This tap is suited for threading fine-pitch 6-40 UNF holes in light-duty fastener applications, instrument components, and small mechanical assemblies. The 6-40 UNF thread form is common in precision work where a finer pitch than 6-32 UNC is required. Machinists, maintenance technicians, and tool-and-die workers will encounter this size in instrumentation, electronics enclosures, and small fixture fabrication. It performs well in drill-press, tapping-arm, and hand-tapping setups.

Key Features

• 6-40 UNF thread form with right-hand direction for standard fine-pitch applications
• High-speed steel construction for durability across a range of workpiece materials
• Bright/uncoated finish for general-purpose use without specialized coating requirements
• Plug chamfer (3 to 5 thread lead) for use in through holes and moderately deep blind holes
• H1 thread limit for controlled tolerance in precision threaded assemblies
• 3 flutes promote chip evacuation during tapping operations

Compatibility

Designed as a standard replacement or stock tap for applications requiring 6-40 UNF internal threads in through-hole or blind-hole configurations. Fits standard tap holders and tapping chucks accepting this shank size.

Installation Notes

Secure the workpiece firmly before tapping. Use the correct tap drill size for a 6-40 UNF thread and apply cutting fluid appropriate for the workpiece material to reduce friction and extend tap life. Back off periodically during hand tapping to break and clear chips. Inspect the tap for wear or chipping before each use to avoid thread damage or tap breakage in the bore.