Alpha UNCHB1 1" x 8" UNC Bottoming HSS Tap

• Alpha HSS Hand Taps are precision manufactured in Europe to ISO529 standards.
• HSS Hand Taps are general purpose taps suitable for hand and machine operation, and are suitable for production use.
• 2N Tolerance for optimum thread fit that balances fastener performance, manufacturing, economy and convenience.
• Suitable for use in Steel, Aluminium, Copper, Brass etc.
• Always use lubricant. Click here for our range.

BOTTOMING taps have a lead of two threads and are used when tapping blind holes. Usually preceded by a taper or intermediate tap. Alpha bottoming taps can be identified by their plain shaft, they have no rings on the shaft near the driving square.

• Diameter: 1mm
• Pitch: 8mm
• Overall length: 110mm
• Shaft Diameter: 18mm
• Drive Square: 14.5mm
• Tapping Drill Size: 22.25mm