Aviation Dictionary
بست استاندارد، پیچ و مهره، گیره یا هر وسیله محکم کننده ای که برطبق ضوابط و شرایط بین المللی ساخته شده است
A fastener manufactured to published standards and stocked by manufacturers or distributors. the material, dimensions and finish of commercial fasteners conform to the quality level generally recognized by manufacturers and users as commercial quality.