This part is a kind of semiconductor called NAS1204.

Function of this product has (NAS1202 - NAS1210) BOLT 100 DEG. CLOSE TOLERANCE HEAD & SHANK.

Manufacturers : AVIAQUIP

Image and pinout :

Some of the text within the PDF file :

NAS1202 THRU NAS1210 BOLT 100 DEG. CLOSE TOLERANCE HEAD & SHANK 160,000 PSI SHORT THREAD BASIC PART NO. NAS1202 NAS1203 NAS1204 NAS1205 NAS1206 NAS1207 NAS1208 NAS1209 NAS1210 THREAD .1640-32 UNJC -3A .1900-32 UNJF-3A .2500-28 UNJF-3A .3125*24 UNJF-3A .3750-24 UNJF-3A .4375-20 UNJF-3A .5000-20 UNJF-3A .5625-18 UNJF-3A .6250-18 UNJF-3A "A" "B" "D" DIA DIA. REF MIN DIA AFTER PLATE .337 .328 .385 .376 .507 .497 .635 .625 .762 .752 .890 .880 1.017 1.007 1.145 1.135 1.272 1.262 .280 .328 .449 .577 .704 .832 .959 1.087 1.214 .1635 .1625 .1895 .1885 .2495 .2485 .3120 .3110 .3745 .3735 .4370 .4360 .4995 .4985 .5615 .5605 .6240 .6230 "H" REF. .068 .080 .106 .133 .160 .188 .215 .242 .270 "T" ULT. TS. REF LBS. MIN. .276 .276 .316 .375 .391 .453 .453 .511 .543 1740 2490 4520 7240 10950 14800 1995 [ ... ]

NAS1204 PDF Datasheet Download