Ronstan RF64110 Series 60 Core Block – Single With Becket

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 degrees rotation of the post and shackle. A set
screw arrangement allows the head to be locked at 0 degrees or 90
degrees.

Shackles are high quality forged grade 316 stainless
steel.

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.

Applications

• Ideal for mainsheet, halyard and spinnaker sheet applications
  on boats to 12m (40ft).
• Various control line applications on larger yachts.
• Alloy sheave models are available for use with wire.

Materials

• Sheave: U.V. stabilised Acetal or anodised aluminium (AW
  models)
• Cheek plates: Aluminium alloy
• Ball Bearings: High compression strength carbon black
  Acetal
• Shackle, post and hub: Grade 316 stainless steel.
• Pin: 2205 stainless steel

Spare Parts

Product No.	Description
RF324	Springs,
RF617A	1/4′ pin dia., Standard Dee Shackles, Coined pin head,

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
• Removable becket pin for fitting of pre-spliced lines

Specifications:

Sheave diameter	60 mm
Max. Rope diameter	12 mm
Max. Cable diameter	– mm
Pin diameter	6 mm
M.W.L.	1000 kg
B. L.	2000 kg
Weight	275 g