5/16-18 BSW Bright Merlin Spiral Flute Machine Tap

• HSS
• For general purpose applications
• Helix angle of 30°-35° depending on size
• BSW (British Standard Whitworth) is similar to UNC but differs in that the thread form for a BSW is 55° vs the 60° for UNC
• Spiral flute taps are designed for blind hole applications and lift chips out of the hole
• Bright Finish for tapping a wide range of materials but best suited for Non-Ferrous materials such as Aluminum
• The untreated surface on this tap gives lower friction and good chip flow for softer materials