Skip to content Skip to navigation menu
Live Chat

RONSTAN
Series 50 All-Purpose Double Block

$63.95

Model # 149968 | Mfg # RF51200
In stock online.

This all-purpose block is a great all around solution. A self-lubricating Acetal polymer sheave ensures low friction and is extremely durable. This block is the right choice for sheets, halyards and control line applications for cruising and racing. Head can be locked at 0° or 90° by engaging the grub screw in either the 0 or 90 degree position.

  • High working load
  • Low maintenance, long service life
  • Sheave Size: 2" (50mm)
  • Line Diameter: 1/2" max.
  • Lockable swiveling head post
  • Slotted pin shackle eliminates fouled lines
  • Grade 316 stainless steel load strap
  • Impact and UV resistant, fiber reinforced Nylon cheeks
  • Self-lubricating Acetal polymer sheave ensures low friction and extreme durability

Series 50 All-Purpose Double Block

Ball Bearings Low Friction Bearings
Becket No Becket
Diameter 1/2 Inch or 13 mm
Direction Any
Integral Cleat No Integral Cleat
Mount Type Swivel Shackle
Ratchet Non Ratcheting
Safe Working Load 2200 Pounds
Sheave Diameter 50 mm
Type Double
Weight 8.9 Ounces

West Advisor

The West Advisor articles have answered boaters' questions and provided solutions to boating problems for more than 20 years. West Marine has compiled one of the Web's most comprehensive collections of technical boating information articles.

REVIEW SNAPSHOT®

by PowerReviews
RonstanSeries 50 All-Purpose Blocks
 
4.3

(based on 8 reviews)

Ratings Distribution

  • 5 Stars

     

    (4)

  • 4 Stars

     

    (3)

  • 3 Stars

     

    (0)

  • 2 Stars

     

    (1)

  • 1 Stars

     

    (0)

100%

of respondents would recommend this to a friend.

Pros

  • Well built / quality (7)
  • Easy to use (6)
  • Easy to install (4)
  • Attractive (3)

Cons

No Cons

Best Uses

  • Sailing (8)
  • Small boats (3)
    • Reviewer Profile:
    • Casual/ recreational (4)
    • Was this a gift?:
    • No (3)

Reviewed by 8 customers

Displaying reviews 1-8

Back to top

 
5.0

Well Made Attractive Block

By Olive

from Eugene, OR

About Me Casual/ Recreational

Verified Buyer

Pros

  • Attractive Design
  • Easy To Install
  • Easy To Use
  • Quality Construction

Cons

    Best Uses

    • Sailing
    • Small Boats

    Comments about Series 50 All-Purpose Blocks:

    I purchased several of these blocks for replacements of worn-out ones. A couple of them weren't quite riht for their application, so they will need to be switched out,

    • Was this a gift?:
    • No
     
    5.0

    Quality materails and built to handle heavy working loads.

    By trimmer

    from Annapolis Md

    About Me Professional

    Verified Buyer

    Pros

    • Attractive Design
    • Easy To Install
    • Easy To Use
    • Quality Construction

    Cons

      Best Uses

      • Large Boats
      • Sailing

      Comments about Series 50 All-Purpose Blocks:

      turning block for jib sheet

      • Was this a gift?:
      • No
       
      5.0

      Good block

      By Jim

      from Virginia

      About Me Advanced

      Verified Buyer

      Pros

      • Quality Construction

      Cons

        Best Uses

        • Sailing

        Comments about Series 50 All-Purpose Blocks:

        Nice ball bearing block

        • Was this a gift?:
        • No
         
        5.0

        Nice block at a reasonable price

        By Bill

        from Gulf Shores, Alabama

        About Me Casual/ Recreational

        Verified Buyer

        Pros

        • Attractive Design
        • Easy To Install
        • Easy To Use

        Cons

          Best Uses

          • Sailing

          Comments about Series 50 All-Purpose Blocks:

          Use blocks to replace worn out Shaffer blocks use with 1/2 roller reefing line on foresail. Made a big difference in reducing drag on the line during unfurling of the foresail.

          Service and delivery comments:

          Prompt delivery with a great product.

           
          2.0

          damaged block

          By Lenny

          from West Palm Beach, FL

          About Me Professional

          Verified Buyer

          Pros

          • Quality Construction

          Cons

            Best Uses

            • Sailing

            Comments about Series 50 All-Purpose Blocks:

            The block suits its purpose very well. The block delivered had deep scour groves in the cheek.

             
            4.0

            Simple, but durable

            By The Adventure

            from Sarasota fl

            About Me Casual/ Recreational

            Verified Reviewer

            Pros

            • Easy To Install
            • Easy To Use
            • Quality Construction

            Cons

              Best Uses

              • Sailing

              Comments about Series 50 All-Purpose Blocks:

              It was hard to find in stores, but once I found it and purchased...It was ready to go, simple

               
              4.0

              Good Value for Money

              By Small Axe

              from Naramata, BC

              About Me Casual/ Recreational

              Verified Buyer

              Pros

              • Easy To Use
              • Quality Construction

              Cons

                Best Uses

                • Sailing
                • Small Boats

                Comments about Series 50 All-Purpose Blocks:

                If you are a recreational sailor this product strikes the right balance between quality and price.

                (1 of 1 customers found this review helpful)

                 
                4.0

                Does the job

                By fishnski

                from CB, NC

                About Me Advanced

                Verified Buyer

                Pros

                • Easy To Use
                • Quality Construction

                Cons

                • Picture does not match

                Best Uses

                • Personal Watercraft
                • Sailing
                • Small Boats

                Comments about Series 50 All-Purpose Blocks:

                The product works fine. The only issue was the picture in the catalog does not match the unit but it does the job for me in docking my boat

                Displaying reviews 1-8

                Back to top