These custom stainless captive screws were made using standard off the shelf 10-32 X 3/4″ fully threaded socket cap screws in 18-8 stainless steel material.  The .130-.150″ diameter shoulder was turned down leaving approximately 1/4″ of thread at the end of the screw.  With a relatively loose tolerance on the shoulder diameter this job was a relative breeze and our internal part number is GM-1104-I.