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 5998-01-034-1736
NSN 6105-01-258-6198
NSN 6685-01-226-4068
NSN 5998-01-476-1812
NSN 5996-01-620-6550
NSN 6110-01-398-6928
NSN 5950-00-798-2329
NSN 5905-01-168-1726
NSN 5915-01-115-2747
NSN 5985-01-464-2266
NSN 5975-00-337-8795
NSN 6610-01-431-6867