Barton Series 4/5 (54mm) Blocks

This range of high load cruiser bocks are of rugged construction, featuring high quality injection moulded side plates with all load-carrying components from 316 grade stainless steel. Side plates are through-bolted and riveted for added strength and security.

This good looking and versatile range is designed for use on large cruising and racing yachts. All are designed for ease of use with Barton’s ball-bearing mainsheet traveller systems.

A comprehensive range of cam cleat, fiddle and fiddle & cam cleat versions are available.

Plain Bearing Blocks
Barton plain bearing blocks have a precision moulded acetal sheave running on a large diameter brass bearing, ensuring free running under the highest of loads.

Ball Bearing Blocks
With Barton’s unique super-low friction ball race systems, featuring acetal sheaves and delrin ball bearings, running on a large diameter centre boss. This allows Barton to fit more load-bearing balls, which ensure extremely low friction performance, even under high loads.

Available Heads and Shackles

Fixed Eye
With plain attachment eye

Swivel
Fully swivelling head with removable shackle

Snap Shackle
With a cast stainless steel swivelling snap shackle. Ideal for quick-release downhauls or vang tackles

Variloc Multi Head
Allows swivel to be locked at 30° positions in relation to sheave. Inverting the plastic locking piece converts the swivel mode. Supplied with screw pin strip shackle

Becket
All the appropriate 54mm blocks are available with or without becket.

Specifications

• Sheave Size (Single): 54mm x 17mm (2 1/8 x 5/8″)
• Sheave Size (Fiddle): 38/64mm x 17mm (1 1/2 x 2 1/4″ x 5/8″)
• Max Rope Diameter: 12mm (7/16″)
• Safe Working Load: 750kg (1650lbs)
• Break Load: 1500kg (3300lbs)
• Max Rolling Load (Ball Bearing Blocks): 525kg (1157 lbs)

Break Loads
Where break and safe working loads are stated, it is assumed that all sheaves are evenly loaded as in a purchase tackle. Uneven loading, or loading of one sheave in a double or triple block, will severely affect strength quoted. If unsure, please seek further assistance.

Maximum rolling load on ball bearing blocks is the maximum free running load before ball bearings will distort.