Ronstan 50 mm Series 50 Block
Defender Home Page
Phone: 800-628-8225 Fax: 800-654-1616 Int'l.: 860-701-3400 Email: Contact Us
Shipping Info
no sales tax Defender Home Page
Your Cart

View Cart View Shopping Cart
Check My Order(s)
Track My Package(s)
Conversion Chart
Shopping Areas
Boats & Motors
 Defender Seal

Ronstan 50 mm Series 50 Block

  • Single Block with Loop Head
  • Safe Working Load: 1650 lbs
  • Maximum Line Size: 1/2"
  • Item #: 
    Model #: 
    Shipping Weight: 
    0.25 Lbs.
    List Price: 
    Status:    In Stock



     Single, Loop Head

    All purpose (AP) blocks are a great all around solution. Self-lubricating Acetal polymer sheaves running on polished stainless steel races perform equally well with dynamic loads and high static loads. For durability and a long service life, these blocks are the right choice for sheets, halyards and control line applications for cruising and racing.


    • Exceptionally high working loads
    • Low maintenance, long service life
    • Self-lubricating sheave


    • Safe working load: 1650 lb (750kg)
    • Breaking load: 3310 lb (1500 kg)
    • Weight: 3.5oz (98g)
    • Sheave diameter: 2" (50 mm)
    • Maximum line size: 1/2" (12 mm)


    • Mainsheet and halyard applications, vang and spinnaker control lines on boats to 10m (33ft)


    • U.V. stabilized Acetal sheaves
    • Impact and U.V. resistant, fiber reinforced Nylon cheeks
    • Grade 316 stainless steel bearing race
    • Grade 316 stainless steel load strap
    • Impact and UV resistant, fiber reinforced Nylon cheeks
    WARNING: This product MAY expose you to chemicals, which are known to the State of California to cause cancer, birth defects and/or other reproductive harm. For more information go to

    Wichard Forged Shackle Key
    Item #: 607644
  • Accepts Up To 1/2" Shackles
  • Includes Bottle Opener
  •  Include

    Model #:
    Davis Instruments Deluxe Rigging Knife
    Item #: 612768
  • Blade Type: Dura-Edged Straight, Includes 3" Marlin Spike, Key and Driver
  • Material: Stainless Steel
  • Blade Length: 2-1/2"
  •  Include

    Model #:
    McLube Sailkote High Performance Dry Lubricant
    Item #: 608710DRLQUA
  • Applications: Sails, Hulls, Rigging, Deck Hardware and Anything that Moves
  • Forms a Hard, Smooth, Ultra-Slick, Hydrophobic Dry Coating
  • Will Not Attract Dirt or Contaminants, Container: Quart
  •  Include

    Model #:

    Have A Suggestion?

    Help us make our site better for everyone! Let us know you've found something wrong or frustrating on this page and we will improve it. Please mark each that apply.

    Product has been improperly categorized
    Page loads too slowly
    Product information is incorrect
    Page has errors or bugs
    Site is frustrating or difficult to use
    Product image is missing or wrong
    Cannot find my size
    Spelling errors on page
    Not enough product information

    Comments or Examples:
    Examples: Missing information such as dimensions and model number, typos, inaccuracies, etc...

    Please include your e-mail address below if you would like us to respond to your comments or questions.             

    Join Our Email List And Receive our Monthly Promotions
    Defender Email Specials