Harken® 242 Micro Block Through-Deck
SKU: 242100
MSRP $37.50/EA
Save 12%
2 Available


Harken® Micro Block Through-Deck is a compact, low-friction, lightweight turning block with a smaller sheave diameter of 7/8" (22 mm). It is ideal for use on smaller dinghies and lightly loaded control lines on boats of all sizes. Through-deck blocks, as the name suggests, are installed to be nearly flush with a surface and are used to lead lines through the deck and bulkhead.

Delrin® ball bearings ride on flat races for ultimate low load performance, yet they are capable of working loads of up to 200 pounds (91 kg). The side plates are crafted from marine grade stainless steel for strength and resilience. Designed for all control applications on smaller boats where up to 1/4" (6 mm) line is used, this block has a fast trim and releases under both high and low loads. Easy maintenance: just flush with mild soap and fresh water. Use this block for traveler controls, cunninghams and outhauls, vangs, barber haulers, flag halyards, lead car return tackles and leech cords. The Harken Micro Through-Deck Block is ideal for use inside spars, as well.


  • Block is Mounted Through the Deck
  • UV-Stabilized Delrin© Free-Rolling Ball Bearings
  • UV-Stabilized Delrin© Sheave
  • Marine Grade 316 Stainless Steel Side Plates and Mounting Plate
  • Compact and Lightweight
  • Fast Trim


Sale Unit: EA
Brand: Harken
Number of Sheaves: 1
Sheave Diameter: 7/8 inch (22mm)
Length: 2-5/8 inches (67 mm)
Maximum Line Diameter: 1/4 inch (6 mm)
Maximum Working Load: 200 pounds (91 kg)
Breaking Strength: 1,200 pounds (544 kg)
Fasteners: #10 Round Head (5 mm) (Fasteners Not Included)
Mounting Hole Spacing: 2-1/8 inches (54 mm) (Center-to-Center)
Cutout: 5/8 x 1-9/16 inches (16 x 40 mm)



A. 2.629”
B. 0.875”


A. 0.200”
B. 0.250”
C. 0.790”
D. 2.125”


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