A rowlock , sometimes spur (due to the similarity in shape and size), oarlock (USA) or gate, is a brace that attaches an oar to a

boat A boat is a watercraft of a large range of types and sizes, but generally smaller than a ship, which is distinguished by its larger size, shape, cargo or passenger capacity, or its ability to carry boats. Small boats are typically found on i ...

. When a boat is rowed, the rowlock acts as a

fulcrum A fulcrum is the support about which a lever pivots. Fulcrum may also refer to: Companies and organizations * Fulcrum (Anglican think tank), a Church of England think tank * Fulcrum Press, a British publisher of poetry * Fulcrum Wheels, a bicy ...

for the oar. On ordinary rowing craft, the rowlocks are attached to the

gunwale The gunwale () is the top edge of the hull of a ship or boat. Originally the structure was the "gun wale" on a sailing warship, a horizontal reinforcing band added at and above the level of a gun deck to offset the stresses created by firi ...

s. In the sport of

rowing Rowing is the act of propelling a human-powered watercraft using the sweeping motions of oars to displace water and generate reactional propulsion. Rowing is functionally similar to paddling, but rowing requires oars to be mechanically ...

, the rowlocks are attached to

outrigger An outrigger is a projecting structure on a boat, with specific meaning depending on types of vessel. Outriggers may also refer to legs on a wheeled vehicle that are folded out when it needs stabilization, for example on a crane that lifts ...

s (often just called "riggers"), which project from the boat and provide greater leverage. In sport rowing, the rowlocks are normally U-shaped and attached to a vertical pin which allows the rowlock to pivot around the pin during the rowing stroke. They additionally have a locking mechanism (properly known as "the gate") across the top of the "U" to prevent the oar from unintentionally popping out of the rowlock. Originally, rowlocks were two wooden posts or

thole Thole is a surname. Notable people with the surname include: * Josh Thole (born 1986), American baseball player * Julius Thole (born 1997), German beach volleyball player * Kik Thole (born 1944), Dutch field hockey player * Karel Thole Car ...

pins that the shaft of the oar nestled between. Single thole pins may be used when the oars have holes cut into the loom, which then sits over/around the thole pin.

Sport rowing

In sport rowing oarlocks were originally brass or bronze and open (no gate). With the advent of modern materials oarlocks are now injection moulded plastic and precision made to minimize play (slop) between the oar collar and the oarlock. The most recent sport racing oarlocks have a spring loaded feature to keep the oar collar firmly against the pin at all times. Oarlocks are technical pieces of equipment in sport rowing, holding the oar shaft and therefore the oar blade at the correct angle in the water to ensure optimum performance.

Heraldry

The Norwegian municipalities of

Fosnes Fosnes is a former municipality in Trøndelag county, Norway. The municipality existed from 1838 until its dissolution in 2020 when it was merged into Namsos Municipality. It was part of the Namdalen region. The administrative centre of the mun ...

, Radøy and Tjøme have rowlocks in their

coats of arms A coat of arms is a heraldic visual design on an escutcheon (i.e., shield), surcoat, or tabard (the latter two being outer garments). The coat of arms on an escutcheon forms the central element of the full heraldic achievement, which in i ...

. Rowlock is used in the coat of arms of

Hailuoto Hailuoto (; sv, Karlö) is a Finnish island in the northern Baltic Sea and a municipality in Northern Ostrobothnia region. The population of Hailuoto is (), which make it the smallest municipality in Northern Ostrobothnia and the former Oulu P ...

Finland Finland ( fi, Suomi ; sv, Finland ), officially the Republic of Finland (; ), is a Nordic country in Northern Europe. It shares land borders with Sweden to the northwest, Norway to the north, and Russia to the east, with the Gulf of Bot ...

, to symbolise the maritime economy of the island municipality; the coat of arms is blazoned as " Azure a rowlock

argent In heraldry, argent () is the tincture of silver, and belongs to the class of light tinctures called "metals". It is very frequently depicted as white and usually considered interchangeable with it. In engravings and line drawings, regions to ...

." A type of rowlock is also featured in the

canting arms Canting arms are heraldic bearings that represent the bearer's name (or, less often, some attribute or function) in a visual pun or rebus. French heralds used the term (), as they would sound out the name of the armiger. Many armorial all ...

Hankasalmi Hankasalmi is a municipality of Finland. It is located in the Central Finland region. The municipality has a population of () and covers an area of of which is water. The population density is . The municipality is unilingually Finnish. Ha ...

, alluding to the municipality's name (''hankain'' = rowlock, ''salmi'' =

strait A strait is an oceanic landform connecting two seas or two other large areas of water. The surface water generally flows at the same elevation on both sides and through the strait in either direction. Most commonly, it is a narrow ocean chan ...

).{{cite book , title = Suomen kunnallisvaakunat , publisher = Suomen Kunnallisliitto , year = 1982 , page = 130 , isbn = 951-773-085-3 , language = fi

References

Rowing equipment Water sports equipment