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 5915-00-003-5718
NSN 6685-01-065-0530
NSN 6685-00-045-4032
NSN 6320-01-465-2028
NSN 6610-00-782-0761
NSN 6620-00-769-7303
NSN 5920-01-222-4257
NSN 5930-01-414-8916
NSN 5925-01-477-4212
NSN 6620-01-258-2570
NSN 6685-01-215-7629
NSN 5835-01-123-8305