SPS Technologies Inconel 718 Bolt w Nut 5/8-18 x 3 3/16  Aerospace Surplus 43-1277 220ksi

US Space Program excess 5/8-18 x 3 3/16  in. nominal flight qualified bolt

 approx 3.242 in. overall length

approx 2.215 in. grip length

Standard .625 in diameter

13/16 in. 12 point head cross drilled for safety wire at 2 locations

Nut is all metal with self locking feature 3/4 in. 12 point drive

Nut is about .735 inches high

Nut is not cross drilled

Nut is is similar to shown but is silver plated

Weight about 7.9 oz with nut

Ideal for aircraft, marine, and autosports use

Immune to corrosion in most environments

Do not confuse these flight qualified bolts with cheap imports of unknown quality