MS20427 Carbon Steel, Corrosion-Resistant Steel, or Monel and Copper, 100 Deg. Countersunk Head Solid Rivet. S/S By NASM20427, 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. MS20427 – MS20427H, MILITARY STANDARD, RIVET, SOLID-100 DEG. COUNTERSUNK HEAD, CARBON STEEL, CORROSION-RESISTANT STEEL, MONEL AND COPPER (8 FEB 1994) [S/S BY NASM20427]