| DS1370-55264 | RF74100 |
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$181.00 | |
| Part No. | MPN | Qty | Price | Actions |
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Ronstan Series 75 Core Block™ - Single
RONSTAN SERIES 75 CORE BLOCK SINGLE
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Technical Information Guide
Series 75 Core Block™ - Single
Core Blocks™ are a true all round solution. A tuned 2-stage bearing system provides excellent performance across the full working load range with an integrated thrust bearing feature and the resilience to handle high dynamic or static loads. Acetal sheave, alloy cheeks and stainless fixings complete the durable package. For reliability and a long service life, these blocks are the right choice for sheets, halyards and control line applications for cruising and racing.
Universal Bearing
Dynamic and high static load performance
The Ronstan Universal Bearing incorporates our proven 2-stage bearing system
Stage 1 - Under moderate loads, Acetal ball bearings ensure minimum friction.
Stage 2 - Under heavy loads, where deformation of ball bearings alone would result in increased friction, a sliding Acetal bearing on a polished stainless steel race takes over, maintaining low friction performance.
Additionally the ball bearings are configured to act as a thrust bearing between the sheave and cheeks, preventing the sheave from rubbing on the cheeks and causing friction when the line lead in and out of the block isn't perfect. Particularly important for cheek blocks.
Alloy Cheek Plates
Block cheeks are manufactured from the highest quality alloy for maximum strength. Material optimisation and the cut-away design minimises weight and allows easy fresh water rinsing of salt and debris from the bearings. Cheek design has been further styled with flaring at the block throat and reduced gap between the cheek and sheave, minimising rope wear.
Universal head
The head assembly incorporates a brass bearing washer to provide smooth 360™ rotation of the post and shackle. A set screw arrangement allows the head to be locked at 0™ or 90™.
Shackles are high quality forged grade 316 stainless steel.
Features:
Applications:
Materials:
Specifications:
Sheave Ø: 75mm(3")
Max. Rope Ø: 14mm(9/16")
Pin Ø: 8mm(5/16")
M.W.L.: 1,500kg(3,300lbs)
B. L.: 3,000kg(6,600lbs)
Weight: 354g(12.5oz)
Core Blocks™ are a true all round solution. A tuned 2-stage bearing system provides excellent performance across the full working load range with an integrated thrust bearing feature and the resilience to handle high dynamic or static loads. Acetal sheave, alloy cheeks and stainless fixings complete the durable package. For reliability and a long service life, these blocks are the right choice for sheets, halyards and control line applications for cruising and racing.
Universal Bearing
Dynamic and high static load performance
The Ronstan Universal Bearing incorporates our proven 2-stage bearing system
Stage 1 - Under moderate loads, Acetal ball bearings ensure minimum friction.
Stage 2 - Under heavy loads, where deformation of ball bearings alone would result in increased friction, a sliding Acetal bearing on a polished stainless steel race takes over, maintaining low friction performance.
Additionally the ball bearings are configured to act as a thrust bearing between the sheave and cheeks, preventing the sheave from rubbing on the cheeks and causing friction when the line lead in and out of the block isn't perfect. Particularly important for cheek blocks.
Alloy Cheek Plates
Block cheeks are manufactured from the highest quality alloy for maximum strength. Material optimisation and the cut-away design minimises weight and allows easy fresh water rinsing of salt and debris from the bearings. Cheek design has been further styled with flaring at the block throat and reduced gap between the cheek and sheave, minimising rope wear.
Universal head
The head assembly incorporates a brass bearing washer to provide smooth 360™ rotation of the post and shackle. A set screw arrangement allows the head to be locked at 0™ or 90™.
Shackles are high quality forged grade 316 stainless steel.
Features:
- Class leading performance and sleek, contemporary styling
- Excellent dynamic and high static load performance
- Less than half the friction of the nearest competitor
- Universal head with full 3-axis articulation
- Head posts can be locked at 0 or 90 degrees, by using a 2.5mm Hex/Allen Key
- Central hub hole can be used as a becket take-off or tie-up point
Applications:
- Ideal for mainsheet, halyard and spinnaker sheet applications on boats to 14M (46')
- Various control line applications on larger yachts
Materials:
- Sheave: U.V. stabilized Acetal
- Cheek body: Aluminium Alloy
- Ball Bearings: High compression strength carbon black Acetal
- Shackle, head post & hub: Grade 316 stainless steel
Specifications:
Sheave Ø: 75mm(3")
Max. Rope Ø: 14mm(9/16")
Pin Ø: 8mm(5/16")
M.W.L.: 1,500kg(3,300lbs)
B. L.: 3,000kg(6,600lbs)
Weight: 354g(12.5oz)
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Apply NowRETURN POLICY
We accept returns on most items within 30 days of delivery.
To start a return, submit a Return Authorization (RA) request using the form below. The RA must be issued within 30 days of the delivery date, and the item must be received back at our warehouse within 14 days of the RA being issued.
Requirements for a full refund include:
1. Item must be in new, uninstalled condition.
2. Item must be returned with all original packaging, hardware, and accessories.
3. Return shipping is prepaid by the customer unless the item arrived damaged, defective, or incorrect due to our error.
4. RA number must be clearly marked on the outside of the package.
NON-RETURNABLE ITEMS: The following are final sale and cannot be returned:
- Special order, built-to-order, or custom items
- Items cut, drilled, modified, or installed
- Items missing original packaging or accessories
- Items without proof of purchase
General - Cancellations, Shipping Damage, Missing Packages, Shipment Refusals:
Claims of shipping damage, incorrect items, or missing items must be reported within seven (7) days of delivery. For LTL freight shipments, damage must be noted on the delivery receipt at the time of delivery. Concealed damage claims after a clean signed POD are difficult to recover and may be denied by the carrier. Orders that have been processed and shipped cannot be cancelled, and you may need to wait until you receive the merchandise in order to return it. Customer is responsible for all costs associated with refused shipments including carrier fees, freight to the customer, and return freight. We reserve the right to refuse returns that are sent COD, without a return authorization, show signs of undisclosed installation/use, have missing parts/packaging, missing proof of purchase, or have SKU numbers that do not match our records. If you do not comply with any of the above conditions, we reserve the right to refuse the return/exchange, or to impose different or additional conditions.
Must Be Returned to the Following Address:
Marine Depot Direct
Returns Department
14716 Central Ave
Chino CA 91710
PARTIAL REFUNDS OR RESTOCKING FEES
| Condition | Refund |
|---|---|
| New condition, within 30-day window | 100% of the item price (less return shipping) |
| New condition, past 30-day window (case-by-case)* | 80% of the item price |
| Items that are damaged, missing parts, not in the original condition, or have obvious signs of use for reasons not due to our error | Up to 50% of the item price |
| Products that are unusable, destroyed, or incomplete to the point of no resale value | 0% of the item price |
*For most items, the return window is 30 days after delivery. LTL freight items, oversized items, and large hardware assemblies may be subject to an additional restocking fee to cover return freight and inspection. This will be disclosed when the RA is issued.
How Refunds Are Issued
If you're receiving a refund after we have received your item, it may take an additional three to five business days to process your return fully and issue your refund.
Once we issue your refund, it may take additional time for your funds to be made available in your account by your financial institution. See the following table for more details.
| Refund Method | Refund Time (After Refund Is Processed) |
|---|---|
| Credit card | Three to five business days |
| Debit card | Up to 10 business days |
| Checking account | Up to 10 business days |
Shipping
In-stock items ship within 1 business day from our California or Florida warehouse. Items showing a lead time above ship once stock arrives at our warehouse.
> Same-day shipping on orders placed before 9:00 AM Pacific Time
> Standard ground delivery is 3-7 business days. Need it sooner? Choose Next Day Air or 2nd Day Air at checkout.
> Free shipping on U.S. orders over $99 (excluding AK and HI)
> Oversized items ship by LTL freight. Inspect the shipment and note any damage on the delivery receipt before signing.
> International shipping to Canada and other countries available at checkout
For full details, see our Shipping Policy.