NOTE: If the "Add To Cart" button is missing, that item is not in stock. If you need it badly, contact us to find out when we might be able to ship.

For shackles, stand-up springs, eye straps, see our Fittings page.

Harken: That's almost all you need to know about blocks (the other name is Ronstan, made in Australia, which makes it a higher-price choice for the same functions). We stock the small stuff, carbo blocks and micro blocks, the things that small boat sheets systems are made of, plus control and vang systems for many boats. We also have the important ratchet blocks, the full and mid-size regular ratchets, plus the wonderful 57mm Carbo Ratchamatic that can be a small boat mainsheet ratchet or a gennaker ratchet on a Formula 18 catamaran.

Although we are no longer stocking Bullet Blocks - the Carbos are lighter and less expensive -we still have more than a few laying about. If you really want Bullets, what we have left is priced really cheap. Drop us a note to ask.

Some words about diameter; some sailors are in the habit of stuffing the largest line that they can between the faces of a block in the mistaken notion that the fat line will be easier to handle. Unfortunately, they are working against themselves, fighting the internal resistance of the larger line to turn over a small block. The end result is a system that is harder to pull in, and does not play out as easily, as one that is properly sized. A safe working formula for most double-braided lines (a double-braided line is one that has a braided core with a braided cover over it) is that the block diameter should be about 7 times the diameter of the line, or 8 to 1 if the line is very 'stiff' with a tight weave on the outer cover. So the over-sized half-inch mainsheet seen on some catamarans would need 3 1/2-inch blocks (90mm!) to run smoothly without additional friction. On single-braided lines, the safe ratio is closer to 5 to 1 for a medium braid or even down to 3 to 1 if the line is a very loose braid, so something like 3mm Endura can be used on Harken 16mm blocks, or 8mm Bzzz with 40mm Carbos without adding internal friction.

Some recommendations for small boat sailors (if you are looking for parts for one of the boats we support, go the that boat's page to link to our parts for that boat) ~

     » Boom vangs for small boats - 3:1, use #235 and #244 (Micro blocks), and for 4:1 use #342 (29mm Carbo) and #2658 (40mm Carbo fiddle). Cascading vangs are special problems, buy a complete kit instead of trying to build it yourself. We do stock the cascading vang for the C420.

      » Mainsheets, for little youth boats, use 29mm Carbo blocks, #340 if it needs to swivel, or #348 plus a shackle if it should not swivel. (Hint - blocks on the boom usually should swivel so the line never binds on the block cheeks. Blocks on bridles or travelers usually should not swivel so that the sheet between that block and the boom does not develop twists). For larger mixed youth/adult single-handers and larger dinghies, 2+ persons, use 40mm Carbos. Cats are typically 7:1 or the newer 8:1 that is standard on all Nacras, built up from 57mm Carbos. A 7:1 system uses #2612 + #340 and #2641. For 8:1, use #2619 and #2654.

      » Jibs, usually use 29mm Carbos in various combinations depending on the purchase needed. Modern cats with self-tacking jib gear use 16mm blocks for the sheeting/purchase parts, and Micros on the trim end.

      » Spinnakers on smaller dinghys, use 29mm Carbos, on larger 3+ person dinghies and small keelboats, use 40mm Carbos. On cats, use the 57mm Ratchmatics, either in pairs for crews with less arm strength, or with a #2636 40mm Carbo as a turning block.

16 mm blocks
Micro blocks
29mm Carbo Blocks
40mm Carbo Blocks
Carbo Ratchets
Carbo Ratchmatics
Catamaran Mainsheet Blocks

With one exception (#2612) all blocks come as pictured; if the photo shows a shackle, then shackle is standard. (We add a #340 to the #2612 so it can be used in a 7:1 system.)

About our prices; Pricing continues to be subject to change without notice. Our prices average about 5 to 10% below Harken's retail list prices, sometimes lower if our current stock came in at lower prices than the current list prices from Harken.

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16 mm Airblocks - control systems

	#391 16mm Single / Hook (for Opti sprits!)
	#404 16 mm Airblock Single $14.05
	#405 16 mm Airblock Single / Becket $11.55
	#406 16 mm Airblock Double $21.00
	#407 16 mm Airblock Double / Becket $22.95
	#408 16 mm Airblock Triple $29.75
	#416 16 mm Airblock Cheek $11.95
	#417 16 mm Airblock Single / Swivel $18.20
	#442 16mm Single w/eyestrap $15.45

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Micro blocks - fitting between the 16mm Airblocks and the 29mm Carbos, these are workhorse blocks in multipurchase systems like conventional and cascading vangs, catamaran cunninghams, etc. Use a 225 and 244 for a 3-to-1 vang (Butterfly).

	#224 Micro Single $11.10
	#225 Micro Single / Becket $12.95
	#226 Micro Double $28.50
	#227 Micro Double / Becket $31.00
	#228 Micro Triple $41.25
	#230 Micro Triple / 423 Carbo-Cam $90.00 Use with #227 for a 5:1 system.
	#231 Micro Triple / 423 Carbo-Cam / Becket $92.50 Use with #228 for a 6:1 system.
	#233 Cheek $15.45
	#234 Micro Single / Shackle $16.50
	#235 Micro Single / Shackle / Becket $18.25
	#242 Micro Thru-deck $27.00
	#244 Micro Fiddle / V-jam $33.50 Use with #235 for a simple 3:1 system.
	#292 Micro Single / Swivel $23.00
	#443 Micro Single / Eye Strap $18.95

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29mm Carbo Blocks - The workhorse blocks in control systems - outhaul, downhaul, traveler controls, also as sheet blocks on Optis and other smaller boats.

	#340 29 mm Carbo Single / Swivel $23.00
	#341 29 mm Carbo Single / Swivel / Becket $24.85
	#342 29 mm Carbo Double / Swivel $41.65
	#348 29 mm Carbo Single / Fixed $13.10
	#349 29 mm Carbo Stand-up / fixed $20.10
	#351 29 mm Carbo Ti-Lite $15.50

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40mm Carbo Blocks - Sheets - main, jib, spinnaker, higher-load controls.

	#2636 40 mm Carbo Single / Swivel $33.45
	#2637 40 mm Carbo Single / Swivel / Becket $35.25
	#2638 40 mm Carbo Double / Swivel $66.50
	#2650 40 mm Carbo Single / Fixed $22.00
	#2651 40 mm Carbo Ti-Lite $18.30
	#2652 40 mm Carbo Stand-up / Fixed $30.75
	#2658 Carbo Fiddle 40/29 mm / 423 Carbo-Cam / Becket $113.355 Use with #342 for a great 4:1 system, either a dinghy vang or simple mainsheet.
	#2641 Triple 40mm with becket $142.50 This is the top half of a 7:1 catamaran mainsheet system, used with #2612 below.
	#2654 Quad 40mm $112.25 This big quad, once an exclusive item made only for Nacra, is now available to all cat sailors, to make up an 8:1 mainsheet.

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Carbo Ratchets - these have an on/off switch.

	#2608 40 mm Carbo Ratchet - Single / Swivel $58.65 Basic small dinghy mainsheet block - Optis, Butterfly, Sunfish, also jib block on larger dinghys and spinnaker block.
	#2135 57 mm Carbo Ratchet - Single / Swivel $67.85 Mid-size dinghy mainsheet block - 420, CFJ, 16-ft scows, also jib or spinnaker block on larger one-designs.
	#2670 75 mm Carbo Ratchet - Single / Swivel $81.10 Laser sailors think they need this one, it is in keeping with their macho image. Big enough for larger one-designs including 20' and larger scows.

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Carbo Ratchmatics are load-sensing ratchets, you can adjust the load at which the ratchet kicks in. The biggest benefit, when load is released, they freewheel without the ratchet, so line plays out quickly and easily.

#2625 57 mm Carbo Ratchmatic Single $97.60 Spinnaker sheet blocks on catamarans, jib sheets on larger one-designs, mainsheets on a variety of small/midsize boats.

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Catamaran ratchet/cleat combination blocks - all based on 40mm Carbos. The center sheeve in each one is a standard Harken ratchet. Big pictures so you can see details of these wonderful blocks. Adjustable cleat angle.

	#2619 Use with #2654 40mm Quad to get 8:1 purchase. $216.80
	#2612 with #340 added (see the 2619 photo above, Harken does not supply these two together, we assemble it ourselves for you). Use with #2641 40mm triple/becket to get 7:1 purchase. $187.85

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All prices FOB Granby Colorado.
Prices subject to change without notice.

If you would like more information on these products, send us an info request.