Od 4.1 millimeters
A nonmetallic circular item with an aperature, having a solid round cross-section. They are used primarily for sealing. For items with other than round cross section, see packing,preformed. For noncircular items with a round cross-section, see seal,nonmetallic round section and rubber,round section.
NSN 4140-00-079-8453
NSN 5998-00-560-7971
NSN 6105-01-588-5587
NSN 5985-01-613-5243
NSN 6650-00-804-2039
NSN 5915-01-633-5058
NSN 6610-01-415-5877
NSN 6145-01-547-6651
NSN 5990-01-421-5342
NSN 5905-01-060-2970
NSN 5996-00-106-7515
NSN 5920-00-348-9134