Description
MA5F –
Cummins S911B is a 1/8-27 NPT tapered pipe plug used to seal threaded oil, coolant, fuel, and other machined passages depending on engine/application. Cummins military parts documentation identifies S911B specifically as a 1/8-27 NPT pipe plug, and Interstate-McBee catalogs the direct aftermarket replacement M-S911B.
Published dimensions/specs include:
- Thread: 1/8-27 NPT
- Length: approximately 0.30 in
- Drive: 3/16 in internal hex
- Material: Steel
- Type: Tapered threaded pipe plug
Interstate-McBee’s N14 catalog also lists M-S911B specifically as the 1/8″ NPT cylinder-head pipe plug.
Crosses
S911B, S-911-B, 3008465, 3002158, M-S911B, M3008465, M-3008465, EPP3573, EPP-3573


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