Description
Ronstan Series 30 Ball Bearing Orbit Block | Boat Supply Store
For sailors demanding efficiency on dinghies up to 5m (16'), this block mitigates friction and enhances control over critical lines. Its Acetal sheave and precision ball bearings operate with minimal resistance, supporting a 300kg (660lbs) Maximum Working Load (MWL). Constructed from toughened, glass fiber reinforced Nylon cheeks and a UV stabilized Dyneema® link, this block ensures durability and a superior strength-to-weight ratio for mainsail, spinnaker sheets, or vang applications.
Key Features
- Unparalleled strength-to-weight ratio via advanced composite construction
- Precision ball bearing design for minimum friction
- Lightweight construction through fiber-reinforced composites
- Durable Acetal sheave and ball bearings
- Secure and versatile attachment options
- Compact low-profile design
- Highest working load in its class (300kg MWL)
- UV stabilized Dyneema® link for extended lifespan
Specifications
| Product Specifications | |
|---|---|
| Sheave Ø | 30mm (1-3/16") |
| Max. Rope Ø | 8mm (5/16") |
| M.W.L. | 300kg (660lbs) |
| Breaking Load (BL) | 600kg (1,320lbs) |
| Weight | 21g (0.7oz) |
| Cheeks Material | Toughened, glass fiber reinforced Nylon |
| Sheave Material | Acetal |
| Bearing Material | Acetal |
| Link Material | UV stabilized Dyneema® |
Who This Is For
Sailors and boaters with dinghies up to 5m (16') requiring high-performance, lightweight, and durable blocks for mainsail, spinnaker sheets, halyards, vang, and backstay applications. Also suitable for control line applications on larger yachts.
How It Compares
| Feature | Ronstan Series 30 Ball Bearing Orbit Block | Competitor |
|---|---|---|
| Sheave Ø | 30mm (1-3/16") | — |
| Max. Rope Ø | 8mm (5/16") | — |
| M.W.L. | 300kg (660lbs) | — |
| Weight | 21g (0.7oz) | approx. 40g |
| Frame/Cheeks Material | Toughened, glass fiber reinforced Nylon | Carbo composite |
Common Concerns Answered
Is this block as robust as heavier metal alternatives?
While the initial cost may be higher than basic blocks, the Ronstan Series 30 Orbit Block™ leverages advanced composite materials for an exceptional strength-to-weight ratio, offering superior performance and durability that justifies the investment for serious sailors.
What if I need a higher working load limit?
For applications requiring loads exceeding 300kg (660lbs) MWL, consider blocks from larger size classes. This specific block is optimized for its class, providing the highest working load within the Series 30 designation rather than being a limitation of the product's design.
Are there any common complaints about this block?
The primary concern noted is its higher price point compared to basic blocks. However, users consistently praise its lightweight design, exceptional strength, and smooth, low-friction operation, which are key performance indicators for demanding sailing.
Frequently Asked Questions
What is the working load limit (MWL) of the Ronstan Series 30 Ball Bearing Orbit Block™ - Cheek?
The Maximum Working Load (MWL) for the Ronstan Series 30 Ball Bearing Orbit Block™ - Cheek is 300kg (660lbs).
What is the maximum rope diameter this block can accommodate?
This Ronstan block accepts ropes with a maximum diameter of 8mm (5/16").
What materials are used in the construction of this Ronstan block?
The block features an Acetal sheave and ball bearings, toughened glass fiber reinforced Nylon cheeks, and a UV stabilized Dyneema® link.
What are the typical applications for the Ronstan Series 30 Ball Bearing Orbit Block™ - Cheek?
It is ideal for mainsail sheets, spinnaker sheets, halyards, vang, and backstay applications on dinghies up to 5m (16'), as well as control line applications on larger yachts.
How does the Ronstan Series 30 Ball Bearing Orbit Block™ - Cheek compare to other blocks in its class?
This block offers a superior strength-to-weight ratio due to its composite construction and precision ball bearings, achieving the highest working load in its size class while remaining exceptionally lightweight at only 21g (0.7oz).
