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A D-ring is an item of hardware, usually a tie-down metal ring shaped like the letter D used primarily as a lashing point. The term is found interchangeably spelled in different forms, such as: ''Dring'', ''d-ring'' or even ''Dee-ring''. A D-ring may be used at the end of a leather or fabric strap, or may be secured to a surface with a metal or fabric strap; though there are D-rings with a middle body designed to be welded to steel. Ideally, a D-ring swings freely after it has been secured. D-rings may vary in composition, geometry, weight, finish and load (rated) capacity. Though there are differences, a weld-on pivoting link is commonly called a D-ring. To minimize obstruction when the D-ring is not in use, recessed tie-down rings are designed that accommodate the D-ring so it is flush to the surface. There are some non-recessed designs that have an adhesive base. The corresponding work load limits (WLL) must not be exceeded. ==Lashing points and disambiguation of the term== Applications of D-rings include: *For light loading applications such as clothing and luggage, D-rings made of plastics such as nylon may be used, as they weigh less and are impervious to rusting. *Commonly, at the end of a tow-rope or chain, to allow one to create a bow around an item or part of an item that is being towed by a vehicle. They are commonly used with a chain to tether a boat to a dock or tree when it is being moored. *In theatres, commonly used where a piece of scenery has to be lifted or "flown". D-rings are attached to the tops or bottoms of flats with a "drift line" and turnbuckle attached to adjust the "trim". *A D-ring on an M16 or variant type rifle is used to increase the pressure on the extractor and reduce malfunctions. This D-ring is a rubber grommet shaped like a "D" and fits over the extractor spring adding tension to it. *On breathing sets and scuba divers' buoyancy compensators *A bit ring used on the bit of a horse. *A type of carabiner. *A part of a saddle (see saddle#D-ring) *A type of ring binder. *To attach a leash or tag to a dog collar or dog harness.〔(Country Brook Design, How To Make A Dog Collar )〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「D-ring」の詳細全文を読む スポンサード リンク
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