Value Collection JY4919551 Hand Tap 1-3/8-12 Unf

Product Description

The VALUE COLLECTION JY4919551 is a straight-flute hand tap designed for cutting 1-3/8-12 UNF left-hand internal threads in a wide range of materials. Built from high speed steel with a bright uncoated finish, this tap delivers consistent thread form and dimensional accuracy across production and maintenance applications. The plug chamfer (3-5 threads) eases starting in through-holes and blind holes with adequate depth clearance. At 6-1/16 inches overall length, it provides ample reach for standard threading operations. The 4-flute straight-flute geometry promotes chip evacuation and cutting stability. Class of fit 3B with an H4 thread limit ensures the finished thread meets standard tolerance requirements for precision fastener assemblies.

This tap is suited for manual threading operations performed by machinists, maintenance technicians, and tool-and-die tradespeople working in metalworking, fabrication, and industrial repair environments. The left-hand thread configuration makes it specifically appropriate for applications requiring reverse-thread fasteners, anti-loosening components, or left-hand threaded hardware replacement and repair. It is used with a tap wrench or T-handle in benchtop and in-situ threading tasks where machine tapping is not practical or accessible.

Key Features

• 1-3/8-12 UNF left-hand thread form for reverse-thread applications
• High speed steel construction for durability across a range of workpiece materials
• Bright uncoated finish suitable for use with standard cutting fluids
• Plug chamfer provides 3-5 thread lead-in for controlled starting in through and blind holes
• 4-flute straight-flute design promotes chip control and cutting stability
• H4 thread limit with 3B class of fit for consistent tolerance in precision assemblies

Compatibility

Designed as a standard replacement or production hand tap for 1-3/8-12 UNF left-hand thread applications in metalworking and industrial maintenance settings.

Installation Notes

This tap is installed by machinists or maintenance technicians using a standard tap wrench sized for the square shank. Ensure the workpiece is securely clamped and the tap is started square to the hole axis to prevent thread misalignment or tap breakage. Apply appropriate cutting fluid for the workpiece material throughout the threading operation. Because this is a left-hand tap, rotate counterclockwise to advance the thread.