2022 Ronstan Marine Catalogue - VIEW CATALOGUE

Custom Products

PHOTO CREDIT:© Najad – Yachts of Sweden

B125-0844 Series 125 opening mainsheet block

Product Type:


Part Number:



3750 kg (8267 lb)


7000 kg (15432 lb)


1.19 kg (2.623 lb)

Yacht Model:

Contest 57 CS


Contest Yachts


Contest Yachts, Netherlands


17.23m (56.5 ft)

Product Features:

This Series 125 mainsheet block has been designed as the end-boom mainsheet block on the Contest 57CS. The sheave has torlon© needle bearings and Delrin© side thrust bearings. The most important design feature of this block is that one of it's cheek plates can rotate open to allow the mainsheet to be removed from the block or the block to be removed from the boom attachment strop. The rotating cheek plate is secured in its sailing position by a spring loaded plunger. The block/mainsheet can be removed when anchor or in the marina to give a clear cockpit area. The Contest 57CS has a mainsail of 101 sqm (1100 sq ft)