Kennametal 1545657 Thread Forming Tap 5/16-18 Unc Bottoming Tin

Product Description

The KENNAMETAL 1545657 is a thread forming tap sized 5/16-18 UNC with a bottoming chamfer, designed for cold-forming internal threads without cutting or removing material. Built from Vanadium High Speed Steel (HSS-E) and coated with Titanium Nitride (TiN), it delivers extended tool life in steel threading applications. With an overall length of 2.72 inches and a thread length of 0.69 inches, this tap is sized for compact setups and tight-tolerance blind holes. The H5 thread limit ensures controlled fit for precision assemblies. Licensed machinists, toolroom technicians, and production floor operators install this tap in drill press, CNC, and manual tapping operations.

This tap is suited for blind hole threading in steel workpieces, particularly where a full thread to the bottom of a bore is required. The bottoming chamfer with 1.5 to 2 chamfered threads allows threading close to the bottom of a hole after a plug or taper tap has started the thread. It is a right-hand, single-start tap appropriate for production and maintenance threading operations in ferrous materials classified under material application code P.

Key Features

• Thread forming design displaces material rather than cutting, producing stronger threads with no chips in the bore
• Titanium Nitride (TiN) coating reduces friction and increases surface hardness for longer tool life in steel
• Vanadium High Speed Steel (HSS-E) substrate withstands elevated cutting temperatures
• Bottoming chamfer with 1.5 to 2 chamfered threads allows threading to the bottom of blind holes
• H5 thread limit provides a controlled, close-tolerance fit for precision fastener applications
• 6 oil grooves aid lubrication distribution across the tap body during forming

Compatibility

Designed as an OEM-style replacement or direct-use thread forming tap for 5/16-18 UNC blind hole threading in steel components. Verify pilot hole diameter against H5 thread limit requirements before installation.

Installation Notes

Thread forming taps require a specific pilot hole diameter larger than that used for cut taps; consult a thread forming drill chart for the correct pre-drill size before use. Apply appropriate tapping fluid or cutting oil to the tap and workpiece to ensure proper lubrication during forming. Secure the workpiece firmly and use a tapping guide or machine spindle to maintain axial alignment and prevent tap breakage. Power down all equipment and follow lockout/tagout procedures before changing tooling in any machine setup.