Value Collection MSC-04489522 Hand Tap 1-3/8-6 Unc

Product Description

The VALUE COLLECTION MSC-04489522 is a 1-3/8-6 UNC straight flute hand tap designed for cutting internal threads in through-holes and blind holes. Built from high speed steel with a bright uncoated finish, this tap delivers consistent thread form across ferrous and non-ferrous materials. The taper chamfer — spanning 8 to 10 threads — eases entry and distributes cutting load across multiple teeth, reducing the torque required to start the thread. With 4 flutes and an H4 thread limit, it holds close tolerances for Class 3B fits. Overall length is 6-1/16 inches with a 3-inch thread length. Machinists, toolroom operators, and maintenance mechanics use this tap for production and repair threading applications.

This tap is suited for hand tapping operations in a tap wrench or for use in low-speed machine tapping setups where the operator controls feed. The 1-3/8-6 UNC thread form is common in heavy fastener assemblies, structural connections, and industrial machinery where coarse-pitch threads are specified for high load-bearing capacity. The taper chamfer style makes this tap particularly well-suited for through-hole applications where the tap can pass completely through the workpiece.

Key Features

• 1-3/8-6 UNC thread form with taper chamfer for easy thread entry
• High speed steel construction for durability across a range of workpiece materials
• Bright uncoated finish — suitable for use with cutting oil or tapping fluid
• 4-flute straight flute design for efficient chip clearance in through-hole applications
• H4 thread limit holds Class 3B fit tolerances for precise mating thread assemblies
• 6-1/16-inch overall length with a 3-inch thread length for deep threading reach

Compatibility

Designed as a standard hand tap for 1-3/8-6 UNC threaded holes requiring a Class 3B fit; compatible with standard tap wrenches and T-handle holders sized for large-diameter taps.

Installation Notes

This tap is installed by a machinist or maintenance mechanic using a tap wrench or low-speed tapping machine. Always secure the workpiece and align the tap perpendicular to the hole before applying torque. Use an appropriate cutting fluid or tapping oil to extend tool life and improve thread finish. Back the tap off periodically to break and clear chips, and never force a tap that has seized — reverse the tap carefully to avoid breakage.