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18-8 Stainless Steel Prairie Bolt, Plain Finish, Flange Socket Cap Head, Hex Socket Drive, 5/16'-18 Thread Size, 0.3125' Shoulder Diameter, 2' Grip Length, Made in US (Pack of 1): Industrial & Scientific. 18-8 Stainless Steel Prairie Bolt, Plain Finish, Flange Socket Cap Head, Hex Socket Drive, 5/16"-18 Thread Size, 0.3125" Shoulder Diameter, 2" Grip Length, Made in US (Pack of 1): Industrial & Scientific. The plain finish 18-8 stainless steel prairie bolt has a flange socket cap head with a hex socket drive and is made in USA. The 18-8 stainless steel material provides strength and offers good corrosion resistance in many environments. The material may be slightly magnetic. The flange socket cap head is round with a flat top and high profile that provides high strength. It has a flange that acts as a washer to increase surface contact and distribute load over a larger area than a standard socket cap head and can be used to fasten thin or soft materials. The hex socket drive has a hexagonal slot that requires an Allen key driver, also known as a hex key or Allen wrench.。Prairie bolts have an unthreaded portion of their shank beneath a large flanged head to fasten materials together. Grip length, also called shoulder length, is measured from underneath the flange head to the beginning of the threads. This dimension allows the bolts to accommodate specific material thicknesses, reducing thread damage to the material while also ensuring the threads are fully engaged in the hole for secure fastening.。 。 。 。