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. It is commonly used on low carbons, stainless steel and ferrous metals.
Vanadium High Speed Steel (HSSE) is made of high speed steel, carbon, vanadium carbide and other alloys to increase abrasive wear resistance and toughness. It is commonly used in general applications on stainless steels and high silicon aluminums.
Thread Size (Inch): 1/4-28
Number of Flutes: 3
Class of Fit: 2B
Thread Limit: H5
Material: Vanadium High Speed Steel
Through Coolant: NonThrough Coolant
Thread Direction: Right Hand
Overall Length (Inch): 2-1/2
Thread Standard: UNF
Thread Length (Inch): 0.5910
Shank Diameter (Decimal Inch): 0.2550
Square Size (Decimal Inch): 0.1910