One block, multiple functions: 45mm sheave, swivel head, becket and integrated cam cleat for efficient control of 10mm sailing lines.

The Wichard #63108 Single Plain Bearing Block is designed for sailors looking for more than a simple pulley.

It combines a single 45mm sheave with a swivel head, becket and cam cleat, creating a versatile solution for systems where the rope needs to be redirected, mechanically controlled and quickly secured.

Wichard recommends this model particularly for mainsheet systems and boom vangs.

Plain Bearing Design for High Loads

The #63108 belongs to Wichard’s Plain Bearing Block range.

Unlike a ball-bearing block, its composite sheave runs directly on a stainless-steel bush. Wichard describes these blocks as being designed to withstand high loads and as particularly suitable for static operations.

This makes the #63108 a strong choice when load capacity and durability are more important than extremely low-friction operation under light loads.

45mm Sheave for 10mm Rope

At the heart of the block is a:

45mm Composite Sheave

The block is designed for:

10mm Rope

This combination provides a compact solution for suitable sailing control systems while maintaining a significant load capacity.

Integrated Cam Cleat

One of the key advantages of the #63108 is its:

Integrated Cam Cleat

The cam allows the rope to be secured directly at the block.

This is particularly convenient in control systems where the line needs frequent adjustment. Instead of routing the rope to a completely separate cleat, the integrated cam provides a convenient point for holding and releasing the line.

For the sailor, this means a more complete rope-control solution in a single piece of hardware.

Swivel Head

The swivel head provides greater flexibility in the orientation of the block.

Rather than forcing the block to remain in one fixed direction, the swivel allows it to better align with the direction of the rope.

This is particularly useful in systems where the rope angle can change during operation.

Wichard’s universal head design also provides a wide choice of fastening configurations across this block family.

Integrated Becket

The #63108 also incorporates a:

Becket

The becket provides an additional attachment point for the rope, allowing the block to be incorporated into multi-part purchase systems.

This is particularly useful for applications such as mainsheet systems and boom vangs, where mechanical advantage is required.

By combining the block + becket + cam cleat in one unit, the #63108 can help create a compact and practical control system.

280kg Working Load

The Wichard #63108 has a manufacturer-specified:

Working Load: 280kg

This represents the load specified by Wichard for normal working use of this particular configuration.

The addition of the cam configuration means its working load differs from some simpler 45mm blocks in the same family, so the 280kg figure should be used specifically for part #63108.

900kg Breaking Load

The specified breaking load is:

Breaking Load: 900kg

This demonstrates the high structural capacity of the block relative to its compact dimensions.

Working Load and Breaking Load should not be confused: for selecting and operating the block, always work according to the manufacturer’s 280kg working-load specification, not the breaking-load figure.

316L Stainless Steel Load-Bearing Components

Wichard uses marine-grade materials throughout the #63108 construction.

The manufacturer specifies:

• 316L stainless-steel head configuration
• 316L stainless-steel load straps
• Composite sheave
• POM cheeks
• Composite cam saddle
• 316L stainless-steel terminal / shackle components

This combination provides a balance between strength, corrosion resistance and controlled weight for marine applications.

Lightweight Protective Cheeks

The sheave is protected by lightweight POM cheeks.

These side plates help protect the sheave while keeping the complete block relatively light and compact.

The complete #63108 weighs:

211g

Ideal for Mainsheet Systems

Wichard specifically lists:

Mainsheet Systems

as one of the applications for the #63108.

The combination of a swivel head, becket and cam cleat is particularly useful in a mainsheet arrangement because it provides multiple functions within one block.

The becket can form part of the purchase system, while the cam provides a convenient way of securing and releasing the control line.

Suitable for Boom Vangs

Wichard also recommends the #63108 for:

Boom Vangs

A boom vang system often requires mechanical advantage together with convenient rope control.

The #63108 combines the features required to integrate into an appropriate multi-part control arrangement while keeping the installation compact.

Technical Specifications

These dimensions and load specifications are provided directly by Wichard for part #63108.

Why Choose a Plain Bearing Block?

Plain-bearing blocks are particularly interesting when the application involves significant or relatively static loads.

Wichard’s design uses a sheave running on a stainless-steel bush and specifically positions the range for high loads and static operations.

For the #63108, this robust bearing concept is combined with the convenience of a cam cleat and becket.

The result is a block designed not simply to redirect a rope, but to become an important part of a complete sailing control system.

Three Important Features in One Block

What makes the #63108 especially versatile is the combination of:

Swivel Head

Allows the block to orient itself according to the rope direction.

Becket

Provides an additional rope attachment point for creating a purchase system.

Cam Cleat

Allows the control line to be quickly held and released.

Instead of using several separate pieces of hardware, these functions are integrated into one compact Wichard block.

Why Choose the Wichard #63108?

• Premium Wichard sailing block
• 45mm composite sheave
• Designed for 10mm rope
• Robust plain-bearing construction
• Sheave runs on a stainless-steel bush
• Designed to withstand high loads
• Particularly suitable for static operations
• Swivel head
• Integrated becket
• Integrated cam cleat
• 280kg working load
• 900kg breaking load
• Marine-grade 316L stainless-steel load-bearing components
• Lightweight POM cheeks protect the sheave
• Weight only 211g
• Recommended for mainsheet systems
• Recommended for boom vangs

A Complete 45mm Rope-Control Solution

The Wichard Single Plain Bearing Block #63108 stands out because it combines several important functions in a single unit.

You get a 45mm plain-bearing sheave for 10mm rope, a swivel head for flexible alignment, a becket for creating mechanical advantage, and a cam cleat for fast rope control.

Add a 280kg working load and 900kg breaking load, and the result is a compact but highly capable block for demanding sailing applications.

Choose the Wichard Single Plain Bearing Block 45mm with Swivel Head, Becket & Cam from Cavo Yachting when you need a versatile, high-load block for 10mm rope, mainsheet systems or boom vang applications.

Key Specifications at a Glance