Value Collection JY4844098 Hand Tap 1/2-18 Uns Bottoming Hss

Product Description

The VALUE COLLECTION JY4844098 is a 1/2-18 UNS bottoming hand tap machined from high speed steel with a bright, uncoated finish. It features four straight flutes and a bottoming chamfer, allowing threads to be cut close to the bottom of a blind hole. The right-hand thread direction follows standard cutting convention. At 3.375 inches overall length, this tap is sized for bench or machine hand-tapping operations in trade and industrial settings. The H3 thread limit and 3B class of fit make it suitable for applications requiring close-tolerance internal threads in ferrous and non-ferrous materials.

This tap is used in machining, maintenance, and repair work where 1/2-18 UNS internal threads are required. The bottoming chamfer style is selected when threading must extend to the floor of a blind hole with minimal unthreaded runout. It is commonly used by machinists, millwrights, and maintenance mechanics working on fluid fittings, mechanical assemblies, and repair threading jobs in manufacturing or industrial facilities.

Key Features

• Bottoming chamfer for threading close to the bottom of blind holes
• High speed steel construction provides durability across a range of materials
• Bright, uncoated finish for general-purpose hand tapping
• Four straight flutes for efficient chip clearance in through and blind holes
• Right-hand thread direction, 1/2-18 UNS thread form
• H3 thread limit with 3B class of fit for close-tolerance applications

Compatibility

Designed for cutting 1/2-18 UNS internal threads in hand-tapping or low-speed machine-tapping operations where a bottoming chamfer style is required.

Installation Notes

This tap should be installed in a tap wrench or appropriate tapping fixture and aligned square to the workpiece before cutting begins. Secure the workpiece fully before tapping and apply a suitable cutting fluid to extend tap life and reduce galling. Bottoming taps are typically used as the final step in a tap sequence following a taper or plug tap to complete threads to the bottom of a blind hole. Inspect the tap for chipping or wear regularly and do not force a tap that has seized, as breakage will require extraction.