1/4", 5/16", 3/8", UNC, Stainless Steel (A2), Hex Sets/Bolts, Fully Threaded.

1/4", 5/16", 3/8", UNC, Stainless Steel (A2), Hex Sets/Bolts, Fully Threaded.
 
Threads Per Inch (TPI)
1/4" = 20
5/16" = 18
3/8" = 16
 
ST/ST UNC Nuts can be purchased from the drop down box. 
 
Please note UNC is interchangeable with Whitworth (BSW).