Ronstan Series 20 Single Ball Bearing Block

Shipping from £3.99 or FREE to the UK if you spend over £50*
6 items left
  • Ronstan Series 20 Single Ball Bearing Block - RF20101

    Ronstan 20mm blocks use precision moulded Acetal sheaves running on stainless steel ball bearings which provide high performance & low friction.

    These 20mm pulley blocks are perfect for dinghy control line systems.


    • U.V. stabilised Acetal sheaves
    • Acetal ball bearings
    • Impact modified, fibre reinforced and U.V. stabilised Nylon cheeks
    • Grade 316 stainless steel load straps and head fittings
    • Acetal ball bearings
    • UV stabilised Acetal sheave
    • Grade 316 stainless steel load strap and head fitting
    • Impact and UV resistant, fibre reinforced Nylon cheeks


    • Sheave - 20mm
    • Max Rope Diameter - 6mm
    • Max Working Load - 250kg
    • Breaking Load - 550kg
    • Weight - 16grams
  • Delivery and Costs

    We try to treat delivery as a pass through cost and keep the cost to you as low as possible, on top of our already competitive product prices.

    We offer free UK standard delivery for orders over £50, this does exclude boats, trolleys, masts, booms and large items which can't be sent via standard mail.

    Any order placed by midday will leave us the same day unless there is a lead time which we detail on the product page.

    Delivery Costs

    UK 2nd Class Small Packet - £3.99

    UK 1st Class Small Packet - £4.50

    UK 1st Class Small Packet - Over 1KG - £5.99

    DPD Next Day Courier - £8.99

    Courier - Long Items - Masts, Booms Etc - £40

    Close to England - £10

    We are not currently shipping further afield due to customs charges and the cost of shipping, this will be reviewed soon.

  • Frequenty Asked Questions

    What is the quantity for ropes?

    The quantity is meters. If you order 5 items you will receive one 5 meter continuous length of that specific rope.

    How do I claim my first order discount?

    Simply sign up to our newsletter and we'll send your unique first order discount code.

    Do you ship to other locations?

    We are always happy to provide you with a quote for shipping, simply drop us an email to info@sailingchandlery.com with the items you are planning on ordering and your address.

    Who are Sailing Chandlery?

    We're a team of sailors who are passionate about keeping you sailing and providing an excellent service first time. Find out more.

    I have another question?

    You can call the team on 07793 953564 or email us info@sailingchandlery.com

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