Description
Ronstan Series 50 Block | Boat Supply Store
Engineered for demanding sailing applications, this Ronstan Series 50 block delivers exceptional performance for boats up to 10m (33ft). Its self-lubricating Acetal polymer sheave, running on polished stainless steel races, minimizes friction for smooth line operation under high loads. The robust construction, featuring Grade 316 stainless steel load straps and fiber-reinforced Nylon cheeks, ensures extreme durability in harsh marine environments, making it ideal for mainsail halyards or vang systems on a cruising monohull.
Key Features
- Exceptionally high working loads for critical control lines
- Low friction via self-lubricating Acetal polymer sheave
- Extreme durability from high-quality materials
- Versatile mounting with Captive Lock™ universal head
- Reduced line chafe thanks to slotted pin shackle
- Corrosion resistance with Grade 316 stainless steel load strap
- Impact and UV resistance from fiber-reinforced Nylon cheeks
- Long service life with low maintenance requirements
Specifications
| Product Specifications | |
|---|---|
| Sheave Material | Acetal polymer |
| Sheave Diameter | 50mm |
| Max Line Diameter | 12mm |
| Working Load | N/A (often implicitly derived from boat size) |
| Weight | N/A |
| Fastener Size Required | 2 x 5mm (3/16") |
| Head Type | Captive Lock™ universal head |
| Load Strap Material | Grade 316 stainless steel |
| Cheek Material | Impact and UV resistant, fiber reinforced Nylon |
| Max Boat Length (General Applications) | 10m (33ft) |
| Max Boat Length (S60 Applications) | 12m (40ft) |
Who This Is For
This block is designed for cruising and racing sailors on boats up to 10m (33ft) requiring reliable control for mainsails, halyards, and vang systems. It is also suitable for use on larger vessels up to 12m (40ft) for specific S60 applications and fine-tuning controls.
How It Compares
| Feature | Ronstan Series 50 Block | Competitor |
|---|---|---|
| Sheave Material | Acetal polymer | Delrin, Acetal |
| Head Type | Captive Lock™ universal head | Swivel |
| Load Strap Material | Grade 316 stainless steel | Stainless steel |
| Cheek Material | Impact and UV resistant, fiber reinforced Nylon | Nylon |
| Max Boat Length (General Use) | 10m (33ft) | Up to 30ft (9m), Up to 33ft |
Common Concerns Answered
What is the working load limit for the Ronstan Series 50 All Purpose Block - Single Stand Up?
While not always explicitly stated in marketing, the working load is designed to be substantial for its class, suitable for boats up to 10m (33ft) for general use. For precise load ratings, consult the technical documentation available at the manufacturer's website.
Why are fasteners not included with this block?
Fasteners are not supplied to allow boaters the flexibility to choose the appropriate mounting hardware (type and length) specific to their vessel's construction and installation requirements, ensuring a secure and compliant fit.
Is the price of this block justified compared to simpler options?
The investment in this Ronstan block is validated by its superior combination of high working loads, exceptionally low friction due to the Acetal sheave, and extreme durability from Grade 316 stainless steel and reinforced Nylon construction, providing long-term reliability and performance.
Frequently Asked Questions
What type of applications is this Ronstan block suitable for?
This block is highly versatile, recommended for mainsail and halyard applications, vang and spinnaker control lines on boats up to 10m (33ft). It also serves well for fine-tuning mainsheet tackles, outhauls, cunningham, checkstays, genoa lead pullers, and traveler controls on larger vessels.
What are the dimensions of the Ronstan Series 50 All Purpose Block?
The sheave diameter is 50mm. Specific overall dimensions such as height and width are detailed on the product's technical drawing available via the provided manual URL.
What materials are used in the construction of this Ronstan block?
The sheave is constructed from self-lubricating Acetal polymer, running on polished stainless steel races. The load strap is Grade 316 stainless steel, and the cheeks are made from impact and UV resistant, fiber-reinforced Nylon.
Can the head of the Ronstan Series 50 All Purpose Block be fixed?
Yes, the Captive Lock™ universal head allows for tool-less adjustment and can be oriented or locked into position as needed for specific rigging setups.
What size fasteners are required for mounting this block?
For mounting, you will require 2 x 5mm (3/16") fasteners. The specific type and length should be selected based on your boat's construction and the mounting surface.
