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 5925-01-156-0361
NSN 7035-01-227-2546
NSN 6320-00-636-0922
NSN 5855-01-085-5354
NSN 7035-00-624-7265
NSN 5915-01-627-1197
NSN 5925-00-013-9423
NSN 5999-00-842-5419
NSN 6220-00-904-2429
NSN 4140-01-417-4369
NSN 5855-00-763-2155
NSN 5945-01-061-4234