Second end has a groove at end before threads
A fitting that forms an angle of less that 180 degrees (3.141 radians) from a straight flow. One connecting end has machine threads (straight threads other than pipe or hose series) designed to accommodate a tube or is unthreaded and designed to accommodate a tube. The other end has external or internal machine threads (straight threads other than pipe or hose series) and is designed to facilitate a gasket, preformed packing, washer, or the like, to form a seal at the boss. It may have side or heel inlet(s). It is designed to connect a tube or tube fitting to a boss or boss fitting on items such as tanks, housings, valve fittings, or the like.
Classification: Threaded elbows and bends of iron or steel (other than cast iron or stainless steel) for pipes and tubes
NSN 5925-00-776-5062
NSN 5855-01-147-4785
NSN 5965-01-182-5768
NSN 6685-01-501-8343
NSN 6110-00-335-9687
NSN 6685-01-315-1337
NSN 2925-01-011-8732
NSN 5945-01-551-1250
NSN 5950-00-246-5148
NSN 6610-01-462-5980
NSN 5975-01-120-9810
NSN 4140-01-113-8886