Value Collection JY4863171 Hand Tap 1-3/16-18 Unef Hss

Product Description

The VALUE COLLECTION JY4863171 is a straight-flute hand tap designed for cutting 1-3/16-18 UNEF internal threads in a range of ferrous and non-ferrous materials. Built from bright, uncoated High Speed Steel, this tap delivers the hardness and edge retention needed for production and maintenance threading operations. The plug chamfer features 4 to 5 tapered lead threads, which distribute cutting load gradually and make this tap well-suited for through-hole applications. With 6 flutes and a right-hand thread direction, it produces clean, accurate threads to a Class 3B fit with an H4 thread limit. Overall length is 4 inches.

This tap is used in machine shops, maintenance facilities, and industrial production environments where fine unified thread forms are required. The 1-3/16-18 UNEF designation places it in a specialty range typically found in aerospace, defense, and precision mechanical assemblies where fine-pitch threads provide greater tensile strength and vibration resistance compared to coarser alternatives. It is installed by machinists and maintenance technicians using a standard tap wrench or tapping fixture. Coolant-through capability is not included, so it is intended for manual or low-speed machine tapping with cutting fluid applied externally.

Key Features

• 1-3/16-18 UNEF thread form for fine-pitch internal threading
• High Speed Steel construction for hardness and edge retention across a range of workpiece materials
• Plug chamfer with 4 to 5 lead threads for gradual load distribution in through-hole applications
• 6-flute straight-flute design produces clean chip formation and accurate thread profile
• Bright, uncoated finish maintains original HSS geometry without added coating buildup
• Class 3B fit with H4 thread limit for tight tolerance internal thread applications

Compatibility

Designed as an OEM-style hand tap for cutting 1-3/16-18 UNEF right-hand internal threads in standard through-hole tapping applications where a plug chamfer and Class 3B fit are specified.

Installation Notes

This tap is installed by qualified machinists or maintenance technicians using a tap wrench or tapping fixture aligned perpendicular to the workpiece. Apply an appropriate cutting fluid for the workpiece material before and during tapping to reduce heat and extend tool life. Back the tap out periodically to break and clear chips, particularly in deeper holes. Avoid overloading the tap with excessive torque, as HSS taps can fracture if forced through a misaligned or undersized pilot hole.