MS20426 Aluminum and titanium Colombium Alloty 100 Deg. Countersunk Precision Head Solid rivet. Superseding AN426, S/S By NASM20426, 18 AUG 1998. 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. MS20426 – MS20426 (NOTICE 1), MILITARY STANDARD: RIVET, SOLID, COUNTERSUNK 100 DEG., PRECISION HEAD, ALUMINUM AND TITANIUM COLUMBIUM ALLOY (18 AUG 1998) [SUPERSEDING AN426] [S/S BY NASM20426]