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K-Blocks by Karver

K-Blocks by Karver

Simple and efficient, the innovative K-Block is outstanding for numerous applications. Attached by a basic lashing and combined with a simple design, they are very light yet achieve very high working loads. Between the light weight of the block and the lashing, you can save about 50% weight over conventional blocks.

Lashing through the block's center increases safety in the event of block failure, since the line remains captive in the lashing. Lashing also allows for a huge range of applications and mounting positions, and reduces noise compared to mechanical attachments such as shackles and pins. Lashing instructions from Karver can be found here

The standard Karver blocks are assembled with rollers and ball bearings to ensure very low friction. The KB6 and KB8 have yellow composite cheeks istead, while the KB10 and up have aluminum cheeks. Ideal for sheets and halyards, where a line under high load must turn on a long radius.

The High-Load versions (part numbers end in "C") all have aluminum sideplates and feature self-lubricating, Teflon impregnated bearings to ensure a high working load and breaking strength in relation to their size. Ideal for applications like runners, barber haulers and cunningham, where a highly loaded line must turn on a tight radius.

Part # Description Working Load Weight Line Diameter Block Diameter
kg lb g oz mm in mm in
KB6 Composite (Yellow) 220 485 25 0.88 6 1/4 45.2 1 25/32
KB8 Composite (Yellow) 440 970 42 1.48 8 5/16 50 1 31/32
KB8C Aluminum, High-Load 800 1763 45 158 8 5/16 50 1 31/32
KB10 Aluminum 1000 2204 75 2.64 10 3/8 65 2 9/16
KB10C Aluminum, High Load 1900 4188 91 3.21 10 3/8 68 2 11/16
KB12 Aluminum 1400 3086 119 4.19 12 1/2 79 3 1/8
KB12C Aluminum, High-Load 3000 6613 180 6.35 12 1/2 82 3 15/64
KB14 Aluminum 2000 4409 193 6.80 14 9/16 92 3 5/8
KB14C Aluminum, High Load 5000 11023 374 13.19 14 9/16 110 4 11/32


Product Review:
This product has been reviewed on APS' Blog, The Stern Scoop; take a look for more information.


KB10 Composit K-Block 10mm (3/8) Dia. 65mm Price: $238.00 KB10C High Load K-Block 10mm (3/8) Dia. 68mm Price: $268.00
KB12 K-Block 12mm (1/2) Dia. 79mm Price: $368.00 KB12C High Load K-Block 12mm (1/2) Dia. 82mm Price: $482.00
KB14 K-Block 14mm (9/16) Dia. 92mm Price: $493.00 KB6 Composite K-Block 6mm (1/4) Dia. 45mm Price: $48.70 - $49.95
KB8 Composite K-Block 8mm (5/16) Dia. 50mm Price: $99.85 KB8C High Load K-Block 8mm (5/16) Dia. 50mm Price: $146.00

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