Value Collection JY4848123 Hand Tap 7/8-18 Uns Hss

Product Description

The VALUE COLLECTION JY4848123 is a straight-flute hand tap designed for cutting 7/8-18 UNS internal threads in metalworking applications. Built from high speed steel (HSS) with a bright, uncoated finish, this tap delivers reliable performance across a range of ferrous and non-ferrous materials. The plug chamfer, with its moderate lead-in angle, makes it well-suited for through-hole tapping where partial thread engagement at entry is acceptable. With 4 flutes and a right-hand thread direction, this tap is a standard choice for machinists, maintenance technicians, and tool-and-die professionals working in production or repair environments.

This tap is used in applications requiring a 7/8-18 UNS thread form, a fine-pitch designation less common than unified coarse or fine series threads. It fits typical hand-tapping operations with a tap wrench or T-handle, and is appropriate for use in machine tapping setups running at conservative speeds without coolant-through capability. The 4-11/16 inch overall length provides adequate reach for standard through-hole and shallow blind-hole work in a shop or field environment.

Key Features

• 7/8-18 UNS thread form for fine-pitch unified national special applications
• Plug chamfer provides moderate lead-in, suited for through-hole tapping
• 4-flute straight-flute geometry for chip clearance in a range of materials
• High speed steel construction offers durability across common workpiece materials
• Bright uncoated finish — no additional coating to affect dimensional tolerance
• H3 thread limit for close tolerance control on finished thread diameter

Compatibility

Designed for use in any application requiring a 7/8-18 UNS right-hand internal thread; compatible with standard tap wrenches and machine tap holders accepting straight-shank taps of this size.

Installation Notes

This tap is installed by machinists or maintenance technicians using a calibrated tap wrench or machine tapping setup. Secure the workpiece firmly before tapping and ensure the pilot hole is drilled to the correct tap drill diameter for a 7/8-18 thread. Apply cutting fluid appropriate for the workpiece material to reduce heat and extend tool life. Reverse the tap periodically during hand tapping to break chips and prevent tap breakage.