Popularly used in all assemblies, a standard hex bolt is a staple across the world. Screws too short for the formula thread length shall be threaded as close to the head or shoulder as practicable. But neither the external threads of the bolt nor the internal threads of the nut are exactly .500 in diameter. If you are looking for fully threaded bolts please call … (Nominal diameter is more of a label than a size. Lengths can be as short as 3/8", again for stove bolts, but are usually between about 1… Large diameter bolts are used in frame and engines of Boeing and airbus aircrafts. While stove bolts can be as small as 1/8" in diameter, expect typical bolt sizes to be between about #10 (3/16") and 1 3/4". Pilot Hole Diameter for Lag Bolts Hex bolts with forged heads are also commonly used as headed anchor bolts. The minimum thread length shall be equal to 1/2 of the nominal screw length plus a half inch or 6″ which ever is shorter. UNF Hex Head Bolts ASME B18. Manufacturing. International Organization for Standardization (ISO) standards for threads are: length is twice the diameter of the bolt plus 1/2 inch. Distributor of bolts including large diameter bolts for aircraft applications. Large diameter bolts such as 12-point bolts, blind bolts, high strength bolts, eye bolts, custom bolts and special bolts are available. Bolts meet MS, NAS, DAN, EN and NSA standards. 1/4-20 x 1" (1/4" to 3" Available) Hex Head Cap Screw Bolts, 304 Stainless steel 18-8, Flat Point, Fully Machine Thread, Bright Finish, 25 PCS 4.8 out of 5 stars 118 $7.99 $ 7 . For example, a bolt and nut may be described as being ½” diameter. In stock and ready to ship. Choose from our selection of lag bolts, including steel hex head screws for wood, steel flanged hex head screws for wood, and more. Portland Bolt manufactures hex bolts from 1/2″ diameter through 2-1/2″ diameter in most ASTM, AASHTO, and SAE specifications. In stock and ready to ship. 2.1 The most common type of fastener, a hex head bolt is designed to be tightened with a standard spanner or ratchet and socket. 99 Choose from our selection of bolts, including hex head screws, socket head screws, and more. The diameter equal to the external diameter of the threads or the overall diameter of the part.