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 5855-01-395-0676
NSN 5895-01-210-6018
NSN 6220-01-255-7901
NSN 5985-00-224-5249
NSN 5930-01-625-7312
NSN 5945-01-103-7840
NSN 5835-00-341-5441
NSN 6620-01-229-0896
NSN 5996-01-202-8127
NSN 7035-01-313-6973
NSN 6110-01-519-9131
NSN 5910-01-370-5329