product information and part numbers shown on these pages are not guaranteed correct by aviaquip pty. ltd and are subject to change without notice. 9 NAS1581 100 deg. flush reduced head bolt NAS1581 100 deg. flush reduced head bolt first dash no. thread unjf-3a "a" dia max "b" dia min plated unplated -3 .1900-32 .3047 .2570 .1895 .1885 .1895 .1890 -4 .2500-28 .3988 .3504 .2495 .2485 .2495 .2490 -5 .3125-24 .4787 .4289 .3120 .3110 .3120 .3115 -6 .3750-24 .5662 .5149 .3745 .3735 .3745 .3740 -7b .4375-20 .6741 .6047 .4370 .4360 .4370 .4365 -8 .5000-20 .7611 .6901 .4995 .4985 .4995 .4990 -9 .5625-18 .8449 .7655 .5615 .5605 .5615 .5610 -10 .6250-18 .9329 .8518 .6240 .6230 .6240 .6235 "d" dia grip dash no. thread unjf-3a NAS1581 -3 NAS1581 -4 NAS1581 -5 NAS1581 -6 NAS1581 -7 NAS1581 -8 NAS1581 -9 NAS1581 -10 2 3 4 0.125 0.187 0.250 0.487 0.549 0.613 0.528 0.590 0.653 0.751 0.844 0.925 1.018 5 6 7 8 0.312 0..375 0.438 0.500 0.675 0.738 0.801 0.863 0.715 0.778 0.841 0.903 0.813 0.876 0.929 1.001 0.906 0.969 1.032 1.094 0.987 1.050 1.113 1.175 1.080 1.143 1.206 1.268 1.256 1.319 1.381 1.356 1.419 1.491 9 10 11 12 0.562 0.625 0.688 0.750 0.925 0.988 1.051 1.113 0.965 1.028 1.091 1.153 1.061 1.126 1.189 1.251 1.156 1.219 1.282 1.344 1.237 1.300 1.363 1.425 1.330 1.393 1.456 1.518 1.443 1.506 1.569 1.631 1.543 1.606 1.669 1.731 13 14 15 16 0.812 0.875 0.938 1.000 1.175 1.238 1.301 1.363 1.215 1.278 1.341 1.403 1.313 1.376 1.439 1.501 1.406 1.496 1.532 1.594 1.487 1.550 1.613 1.675 1.580 1.643 1.706 1.768 1.693 1.756 1.819 1.881 1.793 1.856 1.919 1.981 17 18 19 20 1.062 1.125 1.188 1.250 1.425 1.488 1.551 1.613 1.465 1.528 1.391 1.653 1.563 1.626 1.689 1.751 1.656 1.719 1.782 1.844 1.737 1.800 1.863 1.925 1.830 1.893 1.956 2.018 1.943 2.006 2.069 2.131 2.043 2.106 2.159 2.211 21 22 23 24 1.312 1.375 1.438 1.500 1.675 1.738 1.601 1.863 1.715 1.778 1.841 1.903 1.813 1.876 1.939 2.001 1.906 1.969 2.032 2.094 1.987 2.050 2.113 2.175 2.080 2.143 2.206 2.268 2.193 2.256 2.319 2.381 2.293 2.356 2.419 2.481 25 26 27 28 1.562 1.625 1.688 1.750 1.925 1.988 2.051 2.113 1.965 2.028 2.091 2.153 2.063 2.126 2.189 2.251 2.156 2.219 2.282 2.344 2.237 2.300 2.363 2.425 2.330 2.393 2.456 2.518 2.443 2.506 2.569 2.631 2.543 2.606 2.669 2.731 29 30 31 32 1.812 1.875 1.938 2.000 2.175 2.238 2.301 2.363 2.215 2.278 2.341 2.401 2.313 2.376 2.439 2.501 2.406 2.469 2.532 2.594 2.487 2.550 2.613 2.675 2.580 2.643 2.706 2.768 2.693 2.756 2.819 2.881 2.793 2.856 2.919 2.981 34 36 38 40 2.125 2.250 2.375 2.500 2.488 2.613 2.738 2.863 2.528 2.653 2.778 2.903 2.626 2.751 2.876 3.001 2.719 2.844 2.969 3.094 2.800 2.925 3.050 3.175 2.893 3.018 3.143 3.268 3.006 3.131 3.256 3.381 3.106 3.231 3.356 3.481 42 44 46 48 2.625 2.750 2.875 3.000 2.988 3.113 3.238 3.363 3.028 3.153 3.278 3.403 3.126 3.251 3.376 3.501 3.219 3.344 3.469 3.594 3.300 3.425 3.550 3.675 3.393 3.518 3.643 3.768 3.506 3.631 3.756 3.001 3.606 3.731 3.856 3.981 length .015 b a d use tables for diameters and grip / overall lengths when ordering material : alloy steel per nas498 heat treatment : 160,000 - 180, psi uts - per mil-h-6875 finish : cadmium plating per qq-p-416, type 11 class 2 or type 1 class 2 code: dash number designates grip & length (see chart below) "w" after dash no. designates type 1 plating. "d'" after dash no. indicates drilled shank. example: nas1204-8, .250 dia bolt .500 grip type 11 plating. nas1205-10 .3125 dia bolt .625 grip type 2 plating. nas1205-10w .3125 dia bolt .625 grip type 1 plating. nas1205-10d .3125 dia bolt .625 grip drilled shank type 11 plating.
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