1/4, 5/16, 3/8, 1/2″ UNC Hex Set Screws A2 Stainless Steel Fully Threaded Bolts
Size 1/4″ UNC 5/16″ UNC 3/8″ UNC 7/16″ UNC 1/2″ UNC 5/8″ UNC. Set screws are the fully threaded UNC bolt. UNC Hexagon Set Screws. A2 stainless steel hexagon head set screws. A2 stainless is commonly referred to as 304 or 18/8 because it contains 18% chromium and 8% nickel.