What does chainplate mean?
A chainplate is a metal fitting on a sailboat that serves as the critical attachment point between the vessel's structure and its standing rigging. Typically made of stainless steel or bronze, it is bolted through the hull, bulwarks, or deck, and the lower ends of the shrouds and stays — the wires supporting the mast — connect to it via turnbuckles or toggles. Because the entire load of the rig funnels through these relatively small plates, their condition matters enormously: hidden crevice corrosion or fatigue cracking can cause sudden failure and dismasting, so surveyors and careful owners inspect them regularly. The word belongs to nautical and boatbuilding vocabulary rather than everyday English, appearing chiefly in sailing manuals, marine surveys, and refit discussions. Its name simply combines 'chain' with 'plate', reflecting an older era when rigging chains were common aboard ship.
nounA metal plate fastened to the side or deck of a boat to which the standing rigging (such as shrouds and stays) is attached.
- A metal plate secured to a boat's hull or deck to which the lower ends of shrouds or stays are attached.
"The rigger inspected every chainplate for corrosion before stepping the mast."
"Water leaking around the chainplates had stained the cabin ceiling beneath."
"Before the offshore passage, she replaced all four original chainplates with heavier stainless-steel fittings."
Regular plural. Commonly pluralized since boats typically have multiple chainplates for the various shrouds and stays.
"All the chainplates were removed, polished, and rebedded with fresh sealant during the refit."
Hidden behind the deck of nearly every sailboat lies a set of chainplates — the unsung steel anchors holding the entire mast up; if one fails mid-sail, down goes everything above it.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of chainplate
Chainplate is a straightforward English compound formed from 'chain', from Latin catena via Old French chaeine, and 'plate', from Old French platte, ultimately from Greek platys meaning flat or broad. It arose in maritime usage, likely during the early modern period of sail, when rigging was attached to plates fitted along the ship's topsides. It shares its roots with other French-derived words such as plating and plateau.
How chainplate is actually used
A technical term of sailing and boatbuilding, used mainly by sailors, riggers, and marine surveyors. It carries no figurative use and is neutral in register. Chainplates are often discussed in the context of inspection and maintenance because hidden corrosion can lead to dismasting.
Easily confused with chainplate
A shackle is a U-shaped metal link with a pin that connects rigging components, whereas a chainplate is the fixed metal plate bolted to a vessel's structure that anchors those connections.