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Harken 57mm Carbo Quad Block - Swivel MPN-2631 SKU: CWR-88766
MPN: 2631- $296.52
$269.56- $296.52
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57mm Carbo Quad Block - SwivelLow-friction Carbo Air blocks are lightweight, strong, reliable—and affordable. Companions to our popular Harken Big Boat blocks, these small, compact blocks have very high working loads for safe, easy trimming.Features: Sheave Ø (mm) 57 mm Sheave Ø (in) 2...- $296.52
$269.56- $296.52
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Harken 57mm Quad Block Swivel, Center Becket MPN-HSB380 SKU: CWR-88765
MPN: HSB380- $298.47
$271.34- $298.47
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57mm Quad Block Swivel, Center BecketLow-friction Carbo Air blocks are lightweight, strong, reliable—and affordable. Companions to our popular Harken Big Boat blocks, these small, compact blocks have very high working loads for safe, easy trimming. Features: Sheave Ø (mm) 57 mm Sheave Ø (in)...- $298.47
$271.34- $298.47
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Harken Midrange Single w/Aluminum Sheave Block MPN-1542 SKU: CWR-86871
MPN: 1542- $266.11
$241.92- $266.11
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Midrange Single with Aluminum Sheave BlockMidrange blocks’ robust construction makes them ideal to handle the high loads found on medium and large offshore boats. Sheave runs exclusively on a ball bearing system for fast trim and release under any load.Features: Sheave: 76mm/3" Maximum Line:...- $266.11
$241.92- $266.11
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Harken Midrange Single Block MPN-1540 SKU: CWR-86870
MPN: 1540- $198.96
$180.87- $198.96
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Midrange Single BlockMidrange blocks’ robust construction makes them ideal to handle the high loads found on medium and large offshore boats. Sheave runs exclusively on a ball bearing system for fast trim and release under any load. Features: Sheave: 76mm/3" Maximum Line: 14mm/9/16" Max...- $198.96
$180.87- $198.96
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Harken Midrange Double Block MPN-1544 SKU: CWR-86868
MPN: 1544- $388.71
$353.37- $388.71
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Midrange Double BlockMidrange blocks’ robust construction makes them ideal to handle the high loads found on medium and large offshore boats. Sheave runs exclusively on a ball bearing system for fast trim and release under any load.Features: Sheave: 76mm/3" Maximum Line: 14mm/9/16" Max Working...- $388.71
$353.37- $388.71
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Harken 60mm Element Stand Up Block MPN-6277 SKU: CWR-86597
MPN: 6277- $268.81
$244.37- $268.81
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60mm Element Stand Up BlockStand-up blocks are an addition to our Element line. Use them for sheeting and halyard systems, running backstays, controls and other applications where you don’t want the block to hit the deck.Element blocks introduce sideplates that combine forged aluminum and...- $268.81
$244.37- $268.81
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Harken 80mm Element Stand Up Block MPN-6280 SKU: CWR-86596
MPN: 6280- $410.69
$373.35- $410.69
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80mm Element Stand Up BlockStand-up blocks are an addition to our Element line. Use them for sheeting and halyard systems, running backstays, controls and other applications where you don’t want the block to hit the deck.Element blocks introduce sideplates that combine forged aluminum and...- $410.69
$373.35- $410.69
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Harken 80mm Single Element Block Mastbase w/Swivel MPN-6221 SKU: CWR-86595
MPN: 6221- $134.38
$122.16- $134.38
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80mm Single Element Block Mastbase with SwivelElement blocks introduce sideplates that combine forged aluminum and compound curves for strength. They are simultaneously contemporary and very robust. Element’s design pairs the minimum amount of metal required to protect the sheave with a proven journal bearing....- $134.38
$122.16- $134.38
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Harken 60mm Single Element Block Mastbase w/Swivel MPN-6220 SKU: CWR-86594
MPN: 6220- $76.80
$69.82- $76.80
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60mm Single Element Block Mastbase with SwivelElement blocks introduce sideplates that combine forged aluminum and compound curves for strength. They are simultaneously contemporary and very robust. Element’s design pairs the minimum amount of metal required to protect the sheave with a proven journal bearing....- $76.80
$69.82- $76.80
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Harken 38mm Double Big Bullet Block w/Becket MPN-128 SKU: CWR-84720
MPN: 128- $134.50
$122.27- $134.50
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38mm Double Big Bullet Block with BecketLow-friction Bullet blocks lead control lines aft. They are compact and lightweight, with fast trim and release under high or low loads. A range of styles lets these blocks adapt to almost all control line applications. Features: Sheave: 38mm...- $134.50
$122.27- $134.50
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Harken 38mm Double Big Bullet Block MPN-127 SKU: CWR-84719
MPN: 127- $128.39
$116.72- $128.39
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38mm Double Big Bullet BlockLow-friction Bullet blocks lead control lines aft. They are compact and lightweight, with fast trim and release under high or low loads. A range of styles lets these blocks adapt to almost all control line applications. Features: Sheave: 38mm (1-1/2") Maximum...- $128.39
$116.72- $128.39
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Harken 38mm Single Big Bullet Block w/Becket MPN-126 SKU: CWR-84718
MPN: 126- $57.08
$51.89- $57.08
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38mm Single Big Bullet Block with BecketLow-friction Bullet blocks lead control lines aft. They are compact and lightweight, with fast trim and release under high or low loads. A range of styles lets these blocks adapt to almost all control line applications. Features: Sheave: 38mm...- $57.08
$51.89- $57.08
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Harken 38mm Single Big Bullet Block MPN-125 SKU: CWR-84717
MPN: 125- $51.16
$46.51- $51.16
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38mm Single Big Bullet BlockLow-friction Bullet blocks lead control lines aft. They are compact and lightweight, with fast trim and release under high or low loads. A range of styles lets these blocks adapt to almost all control line applications. Features: Sheave: 38mm (1-1/2") Maximum...- $51.16
$46.51- $51.16
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Harken 29mm Double Bullet Block w/Becket MPN-85 SKU: CWR-84714
MPN: 85- $81.99
$74.54- $81.99
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29mm Double Bullet Block with BecketLow-friction Bullet blocks lead control lines aft. They are compact and lightweight, with fast trim and release under high or low loads. A range of styles lets these blocks adapt to almost all control line applications. Features: Sheave: 29mm (1-1/8")...- $81.99
$74.54- $81.99
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Harken 29mm Double Bullet Block MPN-84 SKU: CWR-84712
MPN: 84- $76.44
$69.49- $76.44
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29mm Double Bullet BlockLow-friction Bullet blocks lead control lines aft. They are compact and lightweight, with fast trim and release under high or low loads. A range of styles lets these blocks adapt to almost all control line applications. Features: Sheave: 29mm (1-1/8") Maximum Line:...- $76.44
$69.49- $76.44
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Harken 29mm Single Bullet Block w/Becket MPN-83 SKU: CWR-84709
MPN: 83- $33.70
$30.64- $33.70
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29mm Single Bullet Block with BecketLow-friction Bullet blocks lead control lines aft. They are compact and lightweight, with fast trim and release under high or low loads. A range of styles lets these blocks adapt to almost all control line applications. Features: Sheave: 29mm (1-1/8")...- $33.70
$30.64- $33.70
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Harken 29mm Single Bullet Block MPN-82 SKU: CWR-84707
MPN: 82- $28.15
$25.59- $28.15
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29mm Single Bullet BlockLow-friction Bullet blocks lead control lines aft. They are compact and lightweight, with fast trim and release under high or low loads. A range of styles lets these blocks adapt to almost all control line applications. Features: Sheave: 29mm (1-1/8") Maximum Line:...- $28.15
$25.59- $28.15
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Harken 57mm Single Carbo Ratchet Cheek Block MPN-2137 SKU: CWR-84454
MPN: 2137- $129.36
$117.60- $129.36
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57mm Single Carbo Ratchet Cheek BlockCarbo Ratchets allow sailors to hand-hold loaded lines and offer balance between holding power and controlled easing. Features: Sheave Ø (mm): 57 mm Sheave Ø (in): 2-1/4 in Maximum line Ø (mm): 10 mm Maximum line Ø (in): 3/8 in...- $129.36
$117.60- $129.36
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Harken 57mm Carbo Single Ratchet Block w/Swivel & Becket MPN-2136 SKU: CWR-84453
MPN: 2136- $130.04
$118.22- $130.04
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57mm Carbo Single Ratchet Block with Swivel & BecketCarbo Ratchets allow sailors to hand-hold loaded lines and offer balance between holding power and controlled easing. Features: Sheave Ø (mm): 57 mm Sheave Ø (in): 2-1/4 in Maximum line Ø (mm): 10 mm Maximum line Ø...- $130.04
$118.22- $130.04
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Harken 57mm Carbo Single Ratchet Block w/Swivel MPN-2135 SKU: CWR-84452
MPN: 2135- $119.97
$109.06- $119.97
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57mm Carbo Single Ratchet Block with SwivelCarbo Ratchets allow sailors to hand-hold loaded lines and offer balance between holding power and controlled easing.Features: On/off switch operates from both sides Standard grip: medium/light air; 10:1 holding power Sheave Ø (mm): 57 mm Sheave Ø (in):...- $119.97
$109.06- $119.97
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Frequently Asked Questions
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Repack bearings annually or every 10,000 miles with marine-grade grease to prevent water intrusion and seizing. Check for play or heat after each launch.
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Hubs are sized by axle spindle (1-1/16", 1-3/8", 1-3/4"); match brake type (electric/drum/hydraulic) and bolt pattern (4/5/6 on 4.5-6.5" centers).
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Transom savers, tie-down straps, and fenders protect hulls during towing; LED light kits ensure visibility, while bunks/rollers reduce launch friction.
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Use bow/stern straps rated for 2x boat weight, cross-strap hull sides, and check bunks for even weight distribution to avoid stress cracks.
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Choose 1,200-2,000 lb capacity for tongue weights up to 10% of trailer GVWR; crank or A-frame jacks for easy boat positioning.