NAS662 Flat 100 Deg Head, Plain and Self Lcoking Maching Screw. NAS Standard Machine Screws come in different types and sizes including: NAS1101, NAS1102, NAS1189, NAS1190, NAS1191, NAS1635, NAS1801, NAS1802, NAS220, NAS229, NAS333, NAS514, NAS517, NAS560, NAS583, NAS600, NAS623, NAS662. NAS662 SCREW, MACHINE, FLATHEAD 100 DEGREE HEAD, PLAN AND SELF-LOCKING