This part is a kind of semiconductor called MS21254.

Function of this product has (MS21253 / MS21254) Clip Locking.

Manufacturers : Aircraft

Image and pinout :

Some of the text within the PDF file :

Clevis End for Bearings, Eye End for Pin, Turnbuckle, Clip Locking MATERIAL: STEEL, CARBON OR ALLOY MS21253 and MS21254 Genuine Aircraft Hardware Co. 130 All Original Text, Tables and Drawings are Copyright © by Genuine Aircraft Hardware Co. 2005 Documents in this book for REFERENCE ONLY, not intended for design. Not guaranteed for accuracy. Free Datasheet http://www.net/ [ ... ]

MS21254 PDF Datasheet Download