Value Collection JY4843991 Hand Tap 1/2-12 Uns Hss

Product Description

The VALUE COLLECTION JY4843991 is a 1/2-12 UNS straight flute hand tap designed for cutting internal threads in through-holes and blind holes where manual tapping is required. Built from high speed steel with a bright uncoated finish, this tap runs in the right-hand direction and carries a plug chamfer, making it suited for starting threads in pre-drilled holes while maintaining thread accuracy through a 3B class of fit and H3 thread limit. With four flutes and an overall length of 3.375 inches, it delivers reliable chip clearance and controlled thread geometry across a range of metalworking applications.

This tap is used in maintenance, repair, and fabrication settings where 1/2-12 UNS threads are required. The plug chamfer style makes it appropriate as a general-purpose tap for most threading jobs, handling both through-hole and moderate blind-hole work. It is commonly used by machinists, millwrights, pipefitters, and maintenance technicians tapping mild steel, cast iron, aluminum, and similar machinable materials by hand with a standard tap wrench.

Key Features

• 1/2-12 UNS thread size and standard for specialized thread form applications
• Plug chamfer with 3-5 thread lead for easy starting in pre-drilled holes
• H3 thread limit and 3B class of fit for consistent, accurate thread tolerance
• 4-flute straight flute design promotes chip clearance during hand tapping
• High speed steel construction provides wear resistance across common machinable metals
• Bright uncoated finish suitable for use with cutting fluids on a wide range of materials

Compatibility

Designed as an OEM-style replacement or standard tooling selection for applications requiring 1/2-12 UNS right-hand internal threads, compatible with standard tap wrenches sized for the tap's square drive shank.

Installation Notes

This tap is installed by hand using a standard tap wrench. Always start with a properly sized and deburred pilot hole per UNS thread standards before beginning the tapping operation. Apply cutting fluid appropriate to the workpiece material to reduce heat and extend tool life. Back the tap off periodically to break chips and prevent tap breakage, especially in deeper holes.