This part is a kind of semiconductor called NAS6203.

Function of this product has (NAS6203 - NAS6220) Alloy Steel Short Thread.

Manufacturers : Aviaquip

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NAS6203 THRU NAS6220 SUPERSEDING NAS1103 THRU NAS1120 LENGTH = ± .015 BASIC NUMBER & THREAD SIZE .3780-24 .516 .579 .642 .704 .766 .829 .892 .954 1.016 1.079 1.142 1.204 1.266 1.329 1.392 1.454 1.516 1.579 2.642 2.704 1.766 1.829 1.892 1.954 2.016 2.079 2.142 2.204 2.266 2.329 2.392 2.454 2.579 2.704 2.829 2.954 3.079 3.204 3.329 3.454 3.579 3.704 3.829 3.954 4.079 4.204 4.329 4.528 4.579 4.704 4.829 4.954 5.079 5.204 5.329 5.454 5.579 5.704 5.829 5.954 6.079 6.204 6.329 6.454 .4375-20 .5000-20 .5625-18 .6250-18 BOLT, HEX HEAD, CLOSE TOLERANCE, ALLOY STEEL SHORT THREAD GRIP DASH NO. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 62 64 66 68 70 72 74 76 78 80 82 84 86 88 90 92 94 96 GR [ ... ]

NAS6203 PDF Datasheet Download