This is one of the larger custom female standoffs we supply to a medical equipment manufacturer.  Made in the USA in 18-8 stainless steel material, these RoHS compliant standoffs are 1/2″ across the flats on the outside dimension and 1/4-20 threaded all the way through the 5/8″ length.  Our internal part number is ESIP1367-M09-F16.  We typically supply these female standoffs at smaller 50-200 pieces quantities but have a variety of different sizes that we supply at large volume using both domestic and overseas factory sources, usually with blanket purchase order arrangements set up with our customers.  Blanket orders can be set up with predetermined ship dates or on an as-released basis.