Value Collection JY4873188 Hand Tap 1-7/16-18 Unef

Product Description

The VALUE COLLECTION JY4873188 is a straight-flute hand tap designed for cutting internal threads in through-holes and blind bores where a fully threaded finish is required at the bottom. Ground to a 1-7/16-18 UNEF thread form, it operates with a right-hand cutting direction and carries a 3B class of fit for close-tolerance applications. The H4 thread limit accommodates the dimensional allowances typical in general machining work. Manufactured from high-speed steel with a bright, uncoated finish, it is suited for use in machine shops, maintenance facilities, and fabrication environments where machinists and toolmakers perform precision tapping operations by hand or with a tapping fixture.

This tap is sized for 1-7/16-18 UNEF threads, a fine-pitch unified thread form commonly found in precision mechanical assemblies, aerospace components, and industrial fastener applications where fine thread engagement and vibration resistance are priorities. The bottoming chamfer style, which features a short lead, allows threading to the full depth of blind holes. With six flutes, this tap distributes cutting load across more cutting edges than a standard four-flute tap, which can improve thread finish and tool life in ductile and medium-hardness materials.

Key Features

• Bottoming chamfer for threading to the bottom of blind holes
• 6-flute geometry distributes cutting load and supports improved thread finish
• 1-7/16-18 UNEF thread form for fine-pitch precision applications
• H4 thread limit for standard allowance close-tolerance threading
• 3B class of fit suitable for general precision internal thread applications
• High-speed steel construction with bright uncoated finish

Compatibility

Designed as an OEM-style hand tap for use in standard tap wrenches and tapping fixtures capable of accepting the shank dimensions appropriate to a 1-7/16-18 thread size tool.

Installation Notes

A qualified machinist should select the correct tap drill size per the UNEF thread standard before beginning the tapping operation. Ensure the workpiece is properly clamped and the tap is started square to the bore to prevent thread misalignment or tap breakage. Apply appropriate cutting fluid for the workpiece material throughout the operation. Back the tap off periodically to break and clear chips, particularly in deeper blind holes.