Value Collection JY4870184 Straight Flute Tap 1-1/4-18 Unef

Product Description

The VALUE COLLECTION JY4870184 is a straight flute tap designed to cut 1-1/4-18 UNEF internal threads in through or blind holes. With six flutes and a bottoming chamfer, it is suited for threading close to the bottom of a hole where plug or taper taps cannot reach. Made from high-speed steel with a bright uncoated finish, it delivers reliable performance in general-purpose threading applications on ferrous and non-ferrous materials. The H4 thread limit and 3B class of fit make it appropriate for standard tolerance commercial thread work. It is installed by machinists, maintenance technicians, and tool and die professionals.

This tap is used in production and maintenance machining environments where fine-pitch UNEF threads are required. The 1-1/4-18 UNEF designation is common in applications where a coarser thread would not provide sufficient holding strength in thin-walled or high-precision assemblies. The bottoming style makes it especially useful when a full thread depth must be achieved right to the base of a blind hole. It is appropriate for manual tapping with a tap wrench or machine tapping at controlled speeds and feeds.

Key Features

• Bottoming chamfer allows threading to the bottom of blind holes
• Six flutes provide multiple cutting edges for smoother thread form and chip distribution
• High-speed steel construction handles a broad range of workpiece materials
• Bright uncoated finish suitable for use with cutting fluids and general shop conditions
• H4 thread limit and 3B class of fit for standard commercial tolerance threads
• Right-hand thread direction for standard tapping operations

Compatibility

Designed as a standard replacement or service tap for applications requiring 1-1/4-18 UNEF internal threads with a bottoming chamfer and 3B class of fit.

Installation Notes

A licensed machinist or qualified maintenance technician should install this tap using a properly aligned tap wrench or CNC/manual tapping attachment. Always apply an appropriate cutting fluid for the workpiece material to reduce heat and extend tool life. Ensure the workpiece is securely clamped and the tap is started square to the hole to prevent thread misalignment or tap breakage. Back the tap out periodically to clear chips, especially in deep blind holes.