Value Collection MSC-04919668 Hand Tap 1-1/2-12 Unf

Product Description

The VALUE COLLECTION MSC-04919668 is a bottoming hand tap designed for cutting left-hand internal threads in metal workpieces. Manufactured from bright, uncoated high speed steel, it produces 1-1/2-12 UNF threads with a 3B class of fit and an H4 thread limit. The six-flute, straight-flute geometry provides clean chip evacuation in through-hole and shallow blind-hole applications. With an overall length of 6.375 inches and a thread length of 3 inches, this tap is sized for production and maintenance machining environments. It is used by machinists, toolroom technicians, and skilled trade professionals working on threaded fastener repairs and new-thread forming.

This tap is suited for threading operations that require a left-hand thread orientation, such as counterclockwise-rotating shaft components, turnbuckles, or assemblies where reverse-thread fasteners prevent loosening under operational torque. The bottoming chamfer style allows threads to be cut close to the bottom of a blind hole, making it appropriate for applications where full thread engagement depth near the base of the hole is required. It performs in steel, aluminum, brass, and other machinable metals commonly encountered in general manufacturing and repair work.

Key Features

• Bottoming chamfer cuts threads close to the bottom of blind holes for maximum thread engagement depth
• Left-hand thread direction for counterclockwise-rotating or reverse-thread applications
• High speed steel construction provides hardness and wear resistance across a range of machinable metals
• Six straight flutes support chip clearance in typical hand-tapping operations
• H4 thread limit and 3B class of fit for standard tolerance threaded assemblies
• Bright, uncoated finish suitable for use with cutting oils and standard tapping fluids

Compatibility

Designed as an OEM-style replacement or standard tooling option for any application requiring a 1-1/2-12 UNF left-hand internal thread with a 3B class of fit.

Installation Notes

This tap is installed and operated by machinists or skilled trade technicians using a tap wrench or appropriate machine tapping setup. Always use a cutting fluid or tapping compound appropriate for the workpiece material to reduce tool wear and improve thread quality. Ensure the tap is aligned perpendicular to the workpiece surface before engagement to avoid cross-threading or tap breakage. Reverse the tap periodically during hand tapping to break chips and prevent binding.