Cleveland C57157 Spiral Point Tap 5/16-24 Unf Hss

Product Description

The CLEVELAND C57157 is a spiral point plug tap designed for through-hole threading in a range of metalworking applications. Built from high speed steel with a bright finish, it cuts a 5/16-24 UNF right-hand thread with a 2-flute spiral point geometry that pushes chips ahead of the tap and out through the exit side of the workpiece. The H1 thread limit and Class 2B fit make it suited for standard tolerance threaded holes where close control over minor diameter is required. Machinists, tool and die makers, and maintenance technicians install this tap by hand or under power in drill press or CNC applications.

This tap is configured for through-hole threading in alloy steel, carbon steel, and aluminum workpieces. The plug chamfer — typically 3 to 5 threads of lead — requires a starter hole and allows entry into a clean through-hole without excessive axial force. The spiral point geometry is particularly efficient in production environments where chip evacuation out the bottom of the hole reduces tap breakage and recutting. Series 1011 designates this as part of Cleveland's standard tap line for general-purpose threading work.

Key Features

• Spiral point geometry pushes chips forward through the hole for clean through-hole threading
• High speed steel construction provides wear resistance across alloy steel, carbon steel, and aluminum
• Plug chamfer (3 to 5 thread lead) for standard through-hole entry
• H1 thread limit with Class 2B fit for standard tolerance threaded holes
• Bright finish with no coating for applications where coating compatibility is a concern
• Right-hand thread direction, no coolant-through requirement

Compatibility

Designed for through-hole threading operations producing 5/16-24 UNF Class 2B right-hand threads in alloy steel, aluminum, and carbon steel workpieces.

Installation Notes

Install in a tap wrench, drill press, or CNC tapping head with proper alignment to the pre-drilled pilot hole. Power down and secure the workpiece before beginning the tapping operation. Follow ASME B1.1 standards for UNF thread tolerances and confirm pilot hole diameter against standard 2B tap drill charts before starting. Avoid forcing the tap if resistance increases unexpectedly — back out to clear chips and re-inspect the hole.