How should you select and apply lubrication in a threaded fastener assembly on a ship?

How should you select and apply lubrication in a threaded fastener assembly on a ship?

• A. Use lubricant type specified in the TM; apply a thin even film on threads and under the head if required; avoid excessive lubrication as it can wash away
• B. Use lubricant that is the cheapest available tape
• C. Skip lubrication entirely to avoid contamination
• D. Lubricate only the exterior surface of the bolt

Answer: (A)

The key idea is to follow what the Technical Manual specifies for lubrication, choosing a lubricant compatible with the bolt and environment, and applying only a thin, even film where the manual requires it. A light film on the threads and on the under-head surface ensures uniform friction, so the fastener reaches the correct torque and clamps properly. Too little lubrication can cause galling and corrosion; too much reduces friction too much and can wash away with fluids or contaminate seals, leading to loss of clamping force or difficulty disassembling later. On a ship, where saltwater, humidity, and vibration are factors, using the prescribed lubricant and applying it as a thin, even film helps prevent seizing and simplifies future maintenance. Lubricating only the exterior surface or skipping lubrication entirely fails to protect the threads and contact surfaces and can cause problems during tightening or removal.

The key idea is to follow what the Technical Manual specifies for lubrication, choosing a lubricant compatible with the bolt and environment, and applying only a thin, even film where the manual requires it. A light film on the threads and on the under-head surface ensures uniform friction, so the fastener reaches the correct torque and clamps properly. Too little lubrication can cause galling and corrosion; too much reduces friction too much and can wash away with fluids or contaminate seals, leading to loss of clamping force or difficulty disassembling later. On a ship, where saltwater, humidity, and vibration are factors, using the prescribed lubricant and applying it as a thin, even film helps prevent seizing and simplifies future maintenance. Lubricating only the exterior surface or skipping lubrication entirely fails to protect the threads and contact surfaces and can cause problems during tightening or removal.