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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


KBO Lashing Blocks by Karver

KBO Lashing Blocks by Karver

The KBO block is born to simplify lashing use. Every sailor can enjoy lashing advantages with as less manipulation as standard metallic attachment blocks: it is even easier and faster to install a KBO than a regular block with stainless steel shackle. Designed to be extremely lightweight.

KBO includes side ball and center roller bearings. Friction ratio is minimum. The maximum rope diameter has been increased in this model. The KBO1 Block includes a Rope shackle guide.

Part # Description Working Load Weight Line Diameter Sheave Diameter
kg lb g oz mm in mm in
KBO1 KBO Lashing Block 150 330 10 0.35 6 1/4 22.5 0.89
KBO2 KBO Lashing block 220 485 26 0.91 8 5/16 32 1.26
KBO4 KBO Lashing Block 400 882 27 0.95 8 5/16 32 1.26
KBO6 KBO Lashing Block 600 1,323 46 1.62 10 3/8 38 1.50
KBO10 KBO Lashing Block 1,200 2,645 80 2.82 12 7/16 52 2.05
KBO15 KBO Lashing Block 1,800 3,600 138 4.87 14 1/2 63 2.48
KBO20 KBO Lashing Block 2,600 3,968 186 6.56 14 1/2 74 2.91
KBO30 KBO Lashing Block 3,500 7,716 334 11.78 16 5/8 97 3.82
KBO50 KBO Lashing Block 5,000 11,023 610 21.52 18 11/16 123 4.84


KBO1 Karver KBO1 Lashing Block w/ Guide Price: $22.50 KBO10 Karver KBO10 Lashing Block Price: $253.00
KBO15 Karver KBO15 Lashing Block Price: $438.00 KBO2 Karver KBO2 Lashing Block Price: $34.80
KBO20 Karver KBO20 Lashing Block Price: $538.00 KBO30 Karver KBO30 Lashing Block Price: $988.00
KBO4 Karver KBO4 Lashing Block Price: $48.80 KBO50 Karver KBO50 Lashing Block Price: $1,911.00
KBO6 Karver KBO6 Lashing Block Price: $75.80


KBOw Ratchet Block by Karver

KBOw Ratchet Block by Karver

A world first! The Karver KBOw Block is attached through the center, AND the ratchet works in either direction. No more mistakes running the sheet the wrong way through the ratchet when stuff is hitting the fan - just move the switch to ratchet the other way. Rope shackle allows for fast attachment. Made of reinforced composite fiber for a very high weight to working load ratio.
Part # Description Working Load Breaking Load Sheave Diameter Max Line Weight
lbs kg lbs kg in mm in mm oz g
KBOW1 Ratchet Block 617 280 1234 560 2.17 55 .25 6 .38 10.8


KBOW1 Karver 55mm Reversible Ratchet Block Price: $133.00



KBTi and KB Blocks by Karver

KBTi and KB Blocks by Karver Designed with the Volvo 70's and Cup boat sailing teams, the low friction KBTi blocks are up to 70% lighter than any other existing block on the market. Blocks are designed to be used with high tech, smaller diameter lines and have smaller sheaves to compliment the change. Lashed through the center, they also have the same safety features in case of over loading, where even if the sheave breaks, the rope is still captive by the lacing.

KBTi blocks are made of titanium or stainless steel. The titanium is the lightest, but is not allowed in all classes, if yours is one of them, it is also available in stainless steel. The cheeks are in carbon fiber and the bearings are ceramic or high strength alloy. In addition to being very lightweight, the blocks have very low friction under load, minimum size and maximum safety. *Call for a quote- Prices may vary from prices shown.

Part # Description Working Load Weight Line Diameter Sheave Diameter
kg lb g oz mm in mm in
KBTT12 3 Ton WL - Titanium 2,721 6,000 150 5.29 0.47 12 36 1.41
KBS2 3 Ton - Stainless Steel 2,721 6,000 150 5.29 0.47 12 36 1.41


KBS2 K-Block Stainless Steel 12mm (1/2) Line Price: $1,039.50 KBTTI2 KBTi Titanium Block 12mm (1/2) Line Price: $1,980.00

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