Block, ball raced, medium - 10 mm sheave

SAILSetc design and manufacture. A beautifully simple design of block for lines up to 0.8 mm diameter - simply designed better - that allows real versatility in use.

10 mm sheave, 19 mm long, 15 mm wide, 5.5 mm thick, 2.5 mm Ø fastener holes.

Suitable for use with the main winch loop system on IOM and larger boats. For smaller boats use 061-008. For boats as large as an A Class use 061-013.

The sheave is a stainless steel ball race and the block has the lowest friction of all the similar items we have tested. This is the larger of two otherwise identical items and has enough strength for the sheet loads of boats up to A Class size. Suitable for Dyneema line from 10 kg up to 75 kg breaking strain. It can be dismantled and maintained with no danger to the bearing.

This block can be used in two principal ways. One way is by suspending it on a line of Dyneema. The other way is to fix it to a surface using bolts or screws. Yet another way is to tie it to an eyebolt ref 040-008 or 040-025 with a spring ref 012B-SPRING in between so that the block is supported perpendicular to the surface.

Where the angle between incoming and outgoing lines will be greater than 90 degrees it will be necessary to cut away a little of the block cheeks as shown above.

Each block is supplied with fasteners.

Also available with a shackle, ref 44-050, as an option. Can be extended to form a double, treble or quadruple block for use in a muscle box, see ref. 61-010X.

NB When suspending the block on a line it is important that the line passes through both holes in the block in the way shown in the thumbnail sketches above. It is important that the line holds the parts of the block together as well as it holds the block to the boat/rig.

SAILSetc blocks have black plastic bodies, which may be injection moulded, turned, or printed. The sheaves are stainless steel, but not marine grade stainless steel, and have hardened rust-resistant balls. Fasteners provided are marine grade stainless steel. Other metal parts, if any, are marine grade stainless steel.

Replacement bearings - choose BP-061-010 from the SPARES section of this website.

Maintenance of the bearings used in this product is described here.

Downloadable document: Rigging Guide

Block, also known as poulie, schijfsblok, blok, bozzello, motón, moitão.