Ronstan Series 40 Quin Becket Cleat Ratchet Orbit Block

The Ronstan Series 40 Quin Becket Cleat Orbit RT Block is a complete high-ratio mainsheet component with five sheaves, a becket, a ratchet sheave, an adjustable cleat, and a swiveling head in one assembly. Bringing those functions together keeps a complex purchase more compact and reduces the number of separate fittings around the working end of the tackle. Ronstan lists Series 40 Orbit blocks for mainsheets and spinnaker sheets on dinghies, catamarans, and sportsboats, with additional use in halyard, vang, and backstay systems. This version is particularly useful where the trimmer needs both mechanical advantage and ratchet assistance at the same control point.

A two-stage ball-bearing system keeps the sheaves moving freely while a secondary full-contact bearing supports them as load increases. Toughened glass-fiber reinforced nylon cheeks reduce weight compared with traditional stainless strap construction, and the ratchet sheave adds holding assistance when the sheet is loaded. The carbon-reinforced C-Cleat is carried on adjustable stainless arms so the cleating angle can be set for the crew's working position. A swivel head lets the entire assembly follow the direction of pull rather than forcing the line through a fixed orientation.

• Five-sheave high-ratio purchase configuration
• Integrated becket, ratchet, and adjustable C-Cleat
• Two-stage low-friction bearing system
• Swivel head follows changing load direction

Ronstan specifies line up to 5/16 in, a maximum working load of 1,320 lb, and a 2,650 lb breaking load for this assembly. The published weight is about 13 oz, which is notably light for a block carrying this many functions. Reeve the complete purchase before finalizing the cleat angle so the sheet exits naturally toward the trimmer. For more high-ratio Orbit blocks and mainsheet hardware, browse more Sailing Hardware.