5/16-18 BSW Blue 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
• Suitable for various steels (up to 28Rc) and some stainless steel
• Ferrous Oxide surface treatment increases wear resistance, improves chip flow and reduces chip welding
• The Ferrous Oxide surface treatment also enables the tap to absorb the lubricant / cutting fluid applications and lift chips out of the hole