This part is a kind of semiconductor called MS21250.

Function of this product has BOLT.

Manufacturers : AVIAQUIP

Image and pinout :

Some of the text within the PDF file :

MS21250 SUPERSEDES NAS624 THRU NAS 644 BOLT , STEEL, TENSION, 180 KSI FTU 450°F, 12 POINT EXTERNAL WRENCHED LENGTH GRIP A T NOTES: B 1. Material - steel alloy MIL-S-5626 2. CAD plate TYPE 11, Class 2. 3. Dimensions are in INCHES unless otherwise noted. 4. Tolerances decimals ± .010. 5. Dimensions to be met after plating. 6. Add letter "H" before Dash No. to designate drilled head. 7. First two Dash No's designate dia. in sixteenths. Last three Dash No's designate grip length in sixteenths. USE TABLES FOR GRIP LENGTHS & DIAMETERS WHEN ORDERING DIA THREAD DASH MIL-S -8879 NO. 02 03 04 05 06 07 08 09 10 12 14 16 18 20 22 24 GRIP DASH NO. 004 006 008 010 012 014 016 018 020 022 024 026 028 030 032 034 056 038 040 042 044 046 048 050 .1640-32 .1900-32 .2500-28 .3125-24 .3750-24 .4375-20 . [ ... ]

MS21250 PDF Datasheet Download