- High Springs, Florida, United States
- Jan 30th
DORMER - 0202036 - Spiral Point Taps Series/List: E539 Thread Size (Inch): 1/2-16 Features and Benefits Plug chamfers are the most commonly used chamfer and are designed for efficiently threading through and blind holes. They have 3 to 5 threads. Oxide, also known as black oxide or steam oxide, is a surface treatment that prevents chip building, galling and welding on the workpiece.