MS20613 Steel, Carbon Steel, or Corrosion Resistant Steel Universal head Solid Rivet. (S/S By NASM20613, 8 FEB 1994). Rivets, Collars, & Riv Nuts are available in different types and styles including: MS14218, MS14219, MS16535, MS16536, MS20426, MS20427, MS20470, MS20600, MS20601, MS20604, MS20605, MS20613, MS20615, MS24661, MS24662, MS90353, MS90354, NAS1329, NAS1330, NAS1398, NAS1399, NAS528. MS20613 – MS20613F, MILITARY SPECIFICATION SHEET RIVET, SOLID-UNIVERSAL HEAD, STEEL, CARBON AND STEEL, CORROSION-RESISTANT (8 FEB 1994) [S/S BY NASM20613]