A standoff, internally and/or externally, threaded on both ends with a hinge or pivot point to allow for independent movement of the ends.
NSN 6135-01-222-0703
NSN 4140-01-290-4026
NSN 7035-00-803-3056
NSN 5935-01-556-9363
NSN 5925-01-422-4569
NSN 5925-01-030-5088
NSN 6130-01-634-0603
NSN 6320-01-489-6044
NSN 6650-01-374-4923
NSN 5990-01-054-4255
NSN 5998-01-476-0735
NSN 6110-01-492-0145