![Ronstan Series 75 Core Block - Single [RF74100]](http://harbor-supply.com/cdn/shop/files/55264XL.jpg?v=1730886212&width=1500)
Ronstan Series 75 Core Block - Single [RF74100]
Ronstan Series 75 Core Block - Single [RF74100] is backordered and will ship as soon as it is back in stock.
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Shipping
Shipping
Ground, 2nd Day Air and Next Day Air available ! Same Day Shipping if your order is placed by 4pm Eastern
Returns
Returns
At Harbor Supply, we aim to ensure you’re completely satisfied with your purchase. If you need to return an item, you have 90 days from the date of delivery to initiate a return.
Eligibility for Returns:
To be eligible for a return:
- The item must be in its original condition—unused, unworn, with all tags still attached, and in its original packaging.
- You’ll need the receipt or proof of purchase.
Please note, returns must be authorized before sending any items back. Items returned without prior authorization will not be accepted.
Ronstan Series 75 Core Block - Single [RF74100]
Description
Description
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:
- 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:t75mm(3")
Max. Rope Ø:t14mm(9/16")
Pin Ø:t8mm(5/16")
M.W.L.:t1,500kg(3,300lbs)
B. L.:t3,000kg(6,600lbs)
Weight:t354g(12.5oz)
