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Ronstan Series 45 Core Block, Single/Swivel Halyard

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Updated: April 2025

MSRP: $129.95
$110.46
(You save $19.49 )
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SKU:
RONRF44188
UPC:
9316800484669
Availability:
Y
Weight:
0.50 LBS
Shipping:
Calculated at Checkout.
Size:
45 mm
Manufacturer part #: RF44188 1

Technical Description
Series 60 Core Halyard Block
1 3/4 in
45 mm
1/2 in
12 mm
3/16 in
5 mm
1540 lb
700 kg
3090 lb
1400 kg
5.3 oz
121 g
Manufacturer part #: RF44188

  • High dynamic and static load capacity
  • Efficient 2-stage bearing system
  • Ball bearings to counteract side thrust loads
  • Class leading performance and sleek, contemporary styling
  • Durable aluminium alloy cheek plates
  • Central hub hole can be used as a becket take-off or tie-up point
  • Incorporates a low profile swivel head fork
  • Features a removable screw pin for attachment to padeyes
  • Suitable for 12 mm (1/2") diameter mast collar post
  • Ronstan Series 45 Core Blocks
    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.

    Applications
  • Ideal for mainsheet, halyard and spinnaker sheet applications on boats to 10 m (33 ft)
  • Various control line applications on larger yachts
  • Alloy sheave models are available for use with wire

  • Materials
  • Sheave: U.V. stabilised Acetal
  • Cheek body: Aluminium Alloy
  • Ball Bearings: High compression strength carbon black Acetal
  • Shackle, head post & hub: Grade 316 stainless steel