Value Collection JY4870176 Hand Tap 1-1/4-18 Unef Hss

Product Description

The VALUE COLLECTION JY4870176 is a straight-flute hand tap designed for cutting internal threads in a shop or field setting. Sized at 1-1/4-18 UNEF with a plug chamfer, it is built from bright-finish high speed steel and carries a 6-flute configuration for efficient chip evacuation during hand-tapping operations. The plug chamfer style provides a gradual thread lead-in, making it well suited for threading through-holes and moderately deep blind holes. At 4 inches overall length, it fits standard tap handles used by machinists, maintenance technicians, and tool-and-die professionals.

This tap is used in precision threading applications requiring UNEF (Unified Extra Fine) thread form, commonly found in thin-walled components, instrument housings, and hydraulic fittings where fine thread engagement is critical. It produces a Class 3B internal thread, indicating a close-tolerance fit appropriate for precision assemblies. The H4 thread limit designation guides the user on expected tap oversize relative to nominal pitch diameter, ensuring proper mating with corresponding external threads. Typical users include machinists, MRO technicians, and industrial maintenance professionals working with steel, aluminum, and similar machinable materials.

Key Features

• 1-1/4-18 UNEF thread size for extra-fine pitch internal threading
• Plug chamfer for gradual thread engagement in through-holes and moderately deep blind holes
• 6-flute straight-flute geometry promotes efficient chip removal during hand-tapping
• High speed steel construction provides durability across a range of machinable metals
• Bright (uncoated) finish for compatibility with cutting oils and standard tapping fluids
• Class 3B, H4 thread limit for close-tolerance precision fit assemblies

Compatibility

Designed as an OEM-style hand tap for use with standard 1-1/4-inch square-drive tap handles and tap wrenches accommodating the appropriate shank diameter for this tap size.

Installation Notes

Hand tapping should be performed by a qualified machinist or maintenance technician familiar with tapping procedures for the applicable material. Always apply a suitable cutting fluid or tapping compound before and during the tapping operation to reduce heat and extend tap life. Back the tap out periodically to clear chips and prevent binding, especially in deeper holes. Secure the workpiece firmly before starting and ensure the tap is aligned perpendicular to the hole to maintain thread quality and avoid tap breakage.