Select Page

Current Murrays Sports information regarding COVID-19 virus outbreak, our policy and status at this time. UPDATED 5/25/2020 At this time our warehouse is keeping up with demand, we are making every effort to ship same or next day but it is still possible that Shipping and delivery times may be effected.
Current COVID-19 Notice

Harken Block 12:1 Mainsheet Carbo Ratchamatic Base

$490.35 each

SKU: 56-9964 Categories: , ,

Product Description

Harken #HSB378 is a 57 mm triple fiddle with reinforced cam arms that is used for 12:1 mainsheet systems on beach cats.

Low-friction Carbo AirBlocks® are lightweight, strong, reliable and affordable. Companions to the popular Harken® Black Magic® line, these small, compact blocks have very high working loads for safe, easy trimming.


  • Sheave Diameter: 2-1/4″
  • Length: 6″
  • Maximum Line Diameter: 3/8″
  • Shackle Pin Diameter: 1/4″
  • Maximum Working Load: 2380 lb.
  • Harken #HSB378

Note: Maximum working loads and breaking loads for blocks are based on cam strengths.

Special order item.

Additional information

Weight 1.4 lbs

You may also like…