Speical o-ring material, per mil-p-5510c, do not dupe to any other nsn
A fitting that forms an angle of less than 180 degrees (3.141 radians) from a straight flow. Both connecting ends have machine threads (straight threads other than pipe or hose series) designed to accommodate a tube or is unthreaded and designed to accommodate a tube. It may have side or heel inlet(s). See also elbow, pipe and connector, multiple, fluid pressure line.
Classification: Threaded elbows and bends of iron or steel (other than cast iron or stainless steel) for pipes and tubes
NSN 5895-01-605-2596
NSN 5990-00-765-1264
NSN 6650-01-175-0841
NSN 2925-01-189-4272
NSN 5905-01-514-6861
NSN 5998-00-792-5318
NSN 2925-01-239-6044
NSN 6150-01-477-7089
NSN 5905-01-237-3284
NSN 5935-01-210-3939
NSN 5999-01-411-7801
NSN 6220-01-492-6310