Ronstan Series 40 Ball Bearing Orbit Block - Cheek

The Series 40 Ball Bearing Orbit Block - Cheek is engineered for superior performance in marine and boating applications. Combining ultra-lightweight construction with a high-capacity bearing system, this orbit block enhances the efficiency and reliability of your sailing rigging.

Features

• Ultra Lightweight
• Low friction 2-stage orbital ball bearing system
• Highest working load in its class
• Low profile and compact design
• High-performance cleating
• Base suits curved mounting surfaces
• Low mounting points for maximum strength

Lightweight Design

The Series 40 Orbit Block boasts an exceptionally lightweight design, making it the world’s lightest orbit block in its category. The innovative orbital system ensures that bearings are only engaged in the active areas of the floating sheave, significantly reducing the mass of inactive components. This design minimizes weight without compromising strength, allowing for easier handling and installation on various marine vessels.

Different block configurations further reduce weight and bulk. The single and becket block features a through-sheave becket arrangement, achieving the lowest possible weight. Multi-sheave blocks utilize single intermediate cheeks and an ultra-light head arrangement, offering a 30% weight advantage over competitors. Unlike other brands that use multiple heavy steel channels, our design eliminates unnecessary double cheeks, resulting in a streamlined and efficient orbit block.

Highest Working Load in Its Class

The Series 40 Orbit Block is built to handle the highest working loads in its class. Its orbital ball-bearing arrangement features the largest possible bearing race diameter, maximizing load capacity and performance. The Ronstan 2-stage bearing system includes high compression grade acetal ball bearings and a secondary full-contact bearing, ensuring minimal friction across the entire working load range.

The floating sheave and bearing system are supported by a fiber-reinforced load frame, which has been computer-modeled for optimal stress distribution and durability. This robust construction guarantees reliable performance even under demanding marine conditions.

Recommended Fasteners: 3 x 4mm (5/32") countersunk head screws

Applications

• Mainsheet systems on spinnaker sheets for dinghies up to 5m (16ft)
• Spinnaker sheets on dinghies, sportsboats, and small keelboats up to 5m (16ft)
• Halyard, vang, and backstay applications on boats up to 8m (26ft)
• Control line applications on larger yachts

Materials

Component	Material
Ball Bearings	High compression strength carbon black Acetal
Stage 2 Bearing	Glass fibre reinforced, MoS2 impregnated Nylon
Frame/Cheeks	Toughened, glass fibre reinforced Nylon
Sheave	Carbon fiber reinforced, PTFE impregnated Nylon

Watch Our Product in Action

Orders of physical products placed by 3 PM EST M-F typically ships the same day, if all requested items are in stock. Weekend orders will typically ship on Monday.

Shipping takes 2-7 days.

We currently ship to the Contiguous 48 States.

Life of Sailing merch is custom made for the customer after an order is placed. Total turnaround is typically 7-14 days from order to doorstep.