Ronstan Series 40 Becket Cleat Swivel Orbit Block

The Ronstan Series 40 Becket Cleat Swivel Orbit Block combines a low-friction Orbit block, a becket, and a cleating point in one compact mainsheet or control-line assembly. The becket anchors the standing end of a purchase, while the swivel lets the block follow the working angle of the tackle. An integrated cleat gives the crew a direct place to secure the control line without adding another separate fitting nearby. Ronstan lists this style for small-boat mainsheet and spinnaker-control systems where space and weight are at a premium.

High-compression Acetal ball bearings support the sheave, with a second glass-fiber reinforced, molybdenum-disulfide impregnated nylon bearing surface carrying additional load. That two-stage bearing design is intended to keep friction low across more of the working range than a simple single-stage ball race. The Orbit frame keeps the assembly light and low in profile, while the swivel connection allows useful articulation at the attachment point. Bringing the becket and cleat onto the same unit also reduces the number of separate components that must be positioned around the purchase.

• Integrated becket and cleating point
• Two-stage Orbit ball-bearing system
• Swiveling attachment follows the purchase angle
• Low-profile lightweight construction

The block is designed for line up to 8mm (5/16 in), so the rope and cleat choice should be matched before the system is reeved. Lay out the entire purchase first to make sure the becket, sheave, and cleat all see a fair line without crossing. After saltwater use, rinse both the bearing area and cleat so the moving surfaces remain free of grit. For more Orbit blocks and integrated sail-control hardware, browse more Sailing Hardware.