Value Collection MSC-04424438 Tap Set 4-40 Unc Hss

Product Description

The VALUE COLLECTION MSC-04424438 is a 3-piece tap set designed for cutting 4-40 UNC internal threads in metalworking applications. Each tap is machined from high-speed steel (HSS) with a bright, uncoated finish. The set covers the standard progression used to thread a hole from start to finish. At 1-7/8 inches overall length with a 9/16-inch thread length, these taps are sized for small-fastener work common in precision machining, electronics enclosures, and instrument assembly. The H2 thread limit designation indicates a controlled tolerance suitable for general-purpose threading with standard 4-40 hardware.

This tap set is used wherever a 4-40 UNC threaded hole is required in ferrous and non-ferrous metals, plastics, and similar machinable materials. Typical applications include light-duty machine assembly, electrical panel fabrication, PCB standoff installation, and repair work on existing 4-40 threads. The 3-flute geometry provides a balance of chip clearance and thread-wall support suited to through-holes and shallow blind holes at this small diameter. Machinists, tool-and-die workers, and maintenance technicians working in job shop or production environments are the primary users.

Key Features

• 4-40 UNC thread standard, right-hand direction
• 3-piece set covering full tap progression for start-to-finish threading
• High-speed steel construction for durability across a range of workpiece materials
• Bright uncoated finish for visual inspection and general-purpose use
• H2 thread limit for controlled tolerance compatible with standard 4-40 fasteners
• Compact 1-7/8-inch overall length suits benchtop and machine-mounted applications

Compatibility

Designed as a general-purpose replacement or supplemental tap set for any application requiring 4-40 UNC right-hand internal threads in standard machinable materials.

Installation Notes

Tapping should be performed by a machinist or qualified technician using a properly sized tap wrench or tapping head. Always use the appropriate cutting fluid for the workpiece material to reduce friction and extend tap life. Ensure the tap is started square to the hole to prevent thread damage or tap breakage, which is a common failure point at small diameters like 4-40. Follow applicable shop safety practices when using cutting tools in powered or manual equipment.