Skip to content
Menu
ODR

    Deck maps: every Harken fitting, placed on the boat
    Melges 15 17 Harken fittings J/70 24 Harken fittings J/80 22 Harken fittings J/88 18 Harken fittings J/24 10 Harken fittings J/111 20 Harken fittings C420 17 Harken fittings Opti 6 Harken fittings
    Hardware and rigging by request
    J/100J/109J/92J/35C&C 99C&C 115X-332XR-41Rhodes 19Ideal 18Cape Fear 38FJ
    All 20 classesDon't see your boat? Tell us what you sail
    Harken families
    Build a halyard Choose the rope, diameter and length for your class. Our loft splices the ends and a Harken shackle. Open the halyard builder
    Lines for your class, cut to class lengths
    Melges 15 linesJ/109 linesJ/92 linesJ/35 linesC&C 99 linesC&C 115 linesX-332 linesRhodes 19 linesIdeal 18 linesCape Fear 38 linesFJ lines
    Rope by the foot, by Lion Sailing LS Palma from $0.99/ft LS Rio from $0.99/ft LS Garda from $0.59/ft LS Miami from $0.39/ft LS St. Pete from $0.39/ft
    All rigging
    Sails by Lion Sailing One-design sails, built to order Tell us your class and sail number and Lion Sailing will quote within one business day. Request a sail quote
    Sails for your class
    Melges 15J/70J/80J/88J/24J/100J/109J/111J/92J/35C&C 99C&C 115X-332XR-41Rhodes 19Ideal 18Cape Fear 38FJC420OptiOther class
    Harken 3921 40mm Switch Headboard Car
    Harken 3921

    40mm Switch Headboard Car

    The Harken 3921 40mm Switch Headboard Car, sold at Harken's advertised price by One Design Rigging, an authorized Harken dealer. Ships in about 3 business days.

    $3,520.95List $4,001.20

    Ships in about 3 business days, plus transit.

    Returns within 30 days of delivery. Returns and exchanges

    Part number
    3921
    UPC
    097653290131
    Harken catalogue
    Page 160

    Harken 2026 catalogue, page

    Open the whole catalogue (PDF)
    Family
    Mainsail Handling

    Specifications

    Length
    349 mm13 3/4 in
    Weight
    4280 g151 oz

    From the Harken 2026 catalogue.

    Goes with 3921

    Harken 3821 System AA CB Screwpin Endstop Kit - Round
    3821 System AA CB Screwpin Endstop Kit - Round $108.95List $123.95 Ships in about 3 days
    Harken 3811.NW System A CB Headboard Car Assembly - No Wire
    3811.NW System A CB Headboard Car Assembly - No Wire $768.95List $873.70 Ships in about 3 days
    Harken 1777 System A Plastic Intermediate Slider Car
    1777 System A Plastic Intermediate Slider Car $34.95List $39.15 Ships in about 3 days
    Harken 3817 System AA CB 2.05m Mast Track
    3817 System AA CB 2.05m Mast Track $113.95List $129.50 Ships in about 3 days

    Your cart

    Your cart is empty.

    Shop Harken hardware
      Subtotal
      Shipping and sales tax are worked out at checkout. Parts usually ship in about 3 business days, plus transit. Check out
      Compare

      What can I help you find today?

      Ask about a part, your class or rigging. Answers come from our catalogue, with our prices.

      Try

      Answers are written by AI from our catalogue. Check the part number before you order. Privacy