CORE BLOCKS™

FEATURES

1.

DYNAMIC AND HIGH STATIC LOAD PERFORMANCE.
Core Blocks™ incorporate 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 foot blocks.

2.

ALUMINIUM ALLOY CHEEK PLATES
Block cheeks are manufactured from the highest quality aluminium 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, and the hollow hub can be used as a becket take-off or tie-up point.

3.

ALUMINIUM SHEAVE OPTIONS
Selected models are available with an aluminium sheave which has a deep groove profile specifically made for use with wire.

4.

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.

5. 

SUITS PRE-SPLICED LINES
Removable becket pins allow fitting of pre-spliced lines. The flush fit becket pin head is kind on deck surfaces and won’t snag lines.

6.

FULLY ARTICULATED STAND-UP
Stand-up models have a low profile linkage that provides full rotation and articulation. A high strength precision cast padeye minimises the footprint and a dedicated rubber boot ensures the block is held upright when not loaded.

2-stage bearing2-stage bearing
2-stage bearing
Aluminium Alloy Cheek PlatesAluminium Alloy Cheek Plates
Aluminium Alloy Cheek Plates
Aluminium Sheave OptionsAluminium Sheave Options
Aluminium Sheave Options
Universal HeadUniversal Head
Universal Head
Ronstan Core Blocks Video By Paul Cronin StudiosRonstan Core Blocks Video By Paul Cronin Studios
Ronstan Core Blocks By Paul Cronin Studios
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Core Block™ Products

  1. Ball Bearing
    Series 45 Stand-Up Core Block™
    RF44140 Series 45 Stand-Up Core Block™
    Swivelling stand-up block, includes stainless steel padeye base and rubber standup boot. Requires 2 x 6mm (1/4") fasteners.
    $139.00
  2. Special Purpose
    Series 60 Core Block™, Aluminium Sheave
    RF64100AW Series 60 Core Block™, Aluminium Sheave
    Aluminium sheave is suitable for use with wire or rope. Universal head can be locked at 0 or 90 degrees, or left free to swivel.
    $179.00
  3. Ball Bearing
    Series 60 Core Block™, Snap Shackle Attachment
    RF64103 Series 60 Core Block™, Snap Shackle Attachment
    Snap shackle head provides quick and easy attachment and removal, with full swivel rotation and trunnion articulation
    $199.00
  4. Special Purpose
    Series 75 Core Block™, Aluminium Sheave
    RF74100AW Series 75 Core Block™, Aluminium Sheave
    Aluminium sheave is suitable for use with wire or rope. Universal head can be locked at 0 or 90 degrees or left free to swivel.
    $269.00

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