You save 3,120 (30%)
30% off the seller list price
Estimated doorstep delivery by 13 Nov - 15 Nov from USA
Upgrade Your Sail Control Efficiency
The Ronstan Series 20 Ball Bearing Block is engineered for efficient sail control on sailboats. Its upright lead design and ball bearing mechanism ensure minimal friction, allowing for precise adjustments of halyards and control lines. This block is constructed from durable plastic, suitable for the demanding marine environment. Imported from authorized US retailers and authorized brand partners, it guarantees authentic quality for your sailing needs.
This block is designed to handle the rigors of sailing, providing reliable performance. The ball bearing system ensures smooth running even under load, making sail trimming easier. Its compact size and lightweight design (0.1 lbs / 0.045 kg) make it versatile for various rigging applications on yachts and small craft. The plastic construction offers good resistance to saltwater corrosion.
When comparing to local alternatives, this Ronstan block offers a precision-engineered ball bearing system for superior performance and longevity. While local options may suffice for basic needs, this imported block provides enhanced efficiency and durability for serious sailors. All customs duties and GST are included in the price, with delivery via ExpressBox tracked shipping within 21-23 days.
Precision Engineering for Performance
This Ronstan Series 20 block is built with precision ball bearings for superior performance and reduced friction. Unlike generic blocks, it offers smoother operation and greater durability, essential for competitive sailing or extended cruising. Imported from authorized US retailers and authorized brand partners, it ensures you receive a genuine, high-quality component designed to meet rigorous marine standards. All customs duties and GST are pre-paid, so the price you see is the final landed cost for delivery within 21-23 days.
Ideal for Coastal & Offshore Sailing
This block is best suited for sailors seeking reliable performance in demanding conditions. Its plastic construction offers good resistance to saltwater corrosion, making it suitable for coastal cruising. However, if you require extreme load-bearing capacity for very large yachts or need a block specifically rated for standing rigging, consider heavy-duty stainless steel alternatives. For general sail control on dinghies or small keelboats, this block provides excellent value and performance.
Typical situations where Ronstan Series 20 Ball Bearing Block - Upright Lead 2.27 kg (5 lb) | Marine Grade Sailing Hardware helps — illustrative scenarios, not customer reviews.
A sailor in Mumbai needs to efficiently trim the mainsail on a 30-foot yacht during gusty conditions.
The Ronstan Series 20 block's ball bearing system ensures smooth, responsive control, allowing for quick adjustments to maintain optimal sail shape and boat speed, even with changing winds.
A dinghy sailor in Kerala wants a lightweight, durable block for their jib sheets that won't corrode in the humid, salty air.
This block's lightweight plastic construction and saltwater-resistant design make it ideal for smaller craft, providing reliable performance without adding unnecessary weight or succumbing to corrosion.
| Bearing Type | Ball Bearing |
| Compatible Lubricant Type | Grease |
| Bearing Number | 55363 |
| Unit Count Type | Count |
| Unit Count | 1 |
| Item Type Keyword | sailing-hardware |
| Usage | Upright Lead for Sail Control Lines |
| Warranty Description | Warranty |
| Feature | Ronstan Series 20 | Others |
|---|---|---|
| Bearing Mechanism | Precision Ball Bearing for low friction | Often plain bearing or basic bushing; higher friction |
| Material Durability | UV-stabilized plastic, saltwater resistant | Varies; some may use lower-grade plastics or metals prone to corrosion |
| Performance Under Load | Smooth operation, efficient sail trim | Can be stiff, less efficient, may wear faster |
| Marine Environment Suitability | Designed for saltwater exposure | May require more frequent maintenance or replacement in coastal conditions |
| SKU | ffa8351 |
| GTIN | 9316800255597 |
| Brand | Ronstan |
| Model Number | CWR-55137 |
| Part Number | RF20171 |
| Material | Plastic |
| Color | No Color |
| Item Weight | 0.045 kg (0.1 lb) |
| Item Dimensions | 7.62 cm L x 5.08 cm W x 2.54 cm H (3" L x 2" W x 1" H) |
| Number of Items | 1 |
| Package Quantity | 1 |
| Country of Origin | Not stated by manufacturer — US retail version, sourced from authorized US retailers and authorized brand partners |
About Ronstan
Ronstan is a leading global manufacturer of high-performance sailing hardware, renowned for innovation and quality in blocks, tracks, and rigging systems for competitive and cruising sailors worldwide.
Compliance & Legal
No product-specific compliance warnings identified. Standard imported-goods terms apply: customs duties & GST paid; for personal use in India; follow the manufacturer's usage instructions on the packaging.
Share your experience
Bought this from CrowCrowCrow? Other buyers want to hear how it went.
This item:
Ronstan Series 20 Ball Bearing Block - Upright Lead 2.27 kg (5 lb) | Marine Grade Sailing Hardware
7,140
This item
Ronstan Series 20 Ball Bearing Block - Upright Lead 2.27 kg (5 lb) | Marine Grade Sailing Hardware
7,140
Total price:
33,990
You save 7,680 (18%) Extra3 items selected
3 items
33,990You save 7,680 (18%) Extra
| Attributes | Current |  |  |  |  | ||
|---|---|---|---|---|---|---|---|
| Spec | |||||||
| Price | 7,140 10,260 | 20,460 22,110 | 6,390 9,300 | 3,960 5,690 | 15,140 21,430 | 5,250 8,200 | 4,930 6,520 |
| Brand Name | Ronstan | Lucas Oil | Lindy | Meister | Gaiam | Aerobie | Club Doctor |
| Source | US Retail | US Retail | US Retail | US Retail | US Retail | US Retail | US Retail |
| Sold By | CrowCrowCrow | CrowCrowCrow | CrowCrowCrow | CrowCrowCrow | CrowCrowCrow | CrowCrowCrow | CrowCrowCrow |
Why shop with us
One price. One payment. No surprises.
High risk
Buying Direct
Crowcrowcrow
Safe Lane
