Cleveland C54513 Hand Tap 5/16-18 Unc Bottoming Hss

Product Description

The CLEVELAND C54513 is a 5/16-18 UNC bottoming hand tap ground from high speed steel with a bright uncoated finish. It carries four straight flutes and a right-hand thread direction, making it well suited for cutting full threads close to the bottom of a blind hole or completing a through-hole threading pass. The H5 thread limit holds a Class 2B fit, which covers the majority of standard fastener applications. Overall length is 2.719 inches with a thread length of 0.69 inches. The shank diameter is 0.318 inches and the drive square measures 0.238 inches across, compatible with standard tap wrenches and holders.

This tap is intended for hand tapping and manual machine tapping operations in job shop, maintenance, and production environments. The bottoming chamfer — typically 1 to 2 thread lead — allows threading to within a few threads of the bottom of a blind hole where plug or taper taps cannot reach. The Series 1003 design is appropriate for threading operations in alloy steel, carbon steel, aluminum, and free-machining stainless steel workpieces.

Key Features

• Bottoming chamfer for threading close to the base of blind holes
• 4-flute straight flute geometry for chip control in through and blind hole applications
• High speed steel construction for wear resistance across a range of workpiece materials
• Bright uncoated finish — ready to use or accept supplemental coatings in the field
• H5 thread limit, Class 2B fit for standard UNC fastener tolerance requirements
• Right-hand thread direction, 5/16-18 UNC — one of the most common thread forms in North American trade work

Compatibility

Designed for blind hole and through-hole threading in alloy steel, aluminum, carbon steel, and free-machining stainless steel. Compatible with standard tap wrenches and tapping heads accepting a 0.318-inch shank with a 3/8-inch square drive.

Installation Notes

Hand taps of this type are installed by machinists and maintenance technicians using a tap wrench or machine holder. Always secure the workpiece firmly before tapping and ensure the correct tap drill diameter has been used prior to starting the tap. Apply cutting fluid appropriate to the workpiece material to extend tap life and improve thread quality. Back the tap off periodically to break chips, particularly in blind hole applications.