Blocks

How to choose this product

A block comprises a sheave, or wheel held between two cheeks and a fitting to attach the unit to a fixed point. Its use multiplies mechanical advantage and reduces wear on the lines that run through it.

Applications

Blocks are used to make up block and tackle to increase purchase, as well as for halyard, sheet and other leads. Thus, they are typically found on sailboats, but may be used on any type of boat or ship, even if only for hoisting a flag or for davit operation.

Technologies

Block sheaves can be single, double, triple or even more. Most are of aluminum, stainless steel or titanium, though wood is often used on traditional sailboats. Cable blocks usually have a metal sheave. In friction blocks, the sheave is in direct contact with the axle, while other types have ball bearings or rollers.

Ratchet blocks have internal springs and a toothed mechanism to keep tension on the line between two pulls. They are most common in dinghy sailing. Block anchoring is via a shackle, a swivel or snap shackle, a fork or another system, which will depend on the rotational or torsional freedom of movement required.

How to choose

Roller models are probably the most efficient, combining the friction reduction of ball bearings and the superior sturdiness of the roller. Each block's rated operational and breaking load must be respected, as well as the maximum line diameter it can handle.

67 companies | 1578 products (boat or nautical equipment)

Companies per page

9 products Osculati
51 products Lewmar
Lewmar SYNCHRO
Sailboat single SYNCHRO Lewmar

Lewmar synchro block are engineered for speed, efficiency and superior handling. We use a combination of scientifically optimised block geometry, a Free-Spin bearing and self-aligning head to reduce friction...

Lewmar SYNCHRO
Sailboat double with swivel SYNCHRO Lewmar

Lewmar synchro block are engineered for speed, efficiency and superior handling. We use a combination of scientifically optimised block geometry, a Free-Spin bearing and self-aligning head to reduce friction...

Lewmar SYNCHRO
Sailboat triple with swivel SYNCHRO Lewmar

Lewmar synchro block are engineered for speed, efficiency and superior handling. We use a combination of scientifically optimised block geometry, a Free-Spin bearing and self-aligning head to reduce friction...

Lewmar SYNCHRO
Sailboat single with becket SYNCHRO Lewmar

Lewmar synchro block are engineered for speed, efficiency and superior handling. We use a combination of scientifically optimised block geometry, a Free-Spin bearing and self-aligning head to reduce friction...

Lewmar SYNCHRO
Sailboat double with becket SYNCHRO Lewmar

Lewmar synchro block are engineered for speed, efficiency and superior handling. We use a combination of scientifically optimised block geometry, a Free-Spin bearing and self-aligning head to reduce friction...

Lewmar SYNCHRO
Sailboat single with swivel / becket / camcleat SYNCHRO Lewmar

Lewmar synchro block are engineered for speed, efficiency and superior handling. We use a combination of scientifically optimised block geometry, a Free-Spin bearing and self-aligning head to reduce friction...

153 products Wichard
Wichard MXL6
Sailboat single friction with lashing max rope 8 mm MXL6 Wichard

When used in conjunction with heavy loads (mastfoot block, spinnaker tack point), normal friction blocks are heavy and take up space. Following on from our success with the MX halyard shackle, Wichard...

Wichard MXL8
Sailboat single friction with lashing max rope 10 mm MXL8 Wichard

When used in conjunction with heavy loads (mastfoot block, spinnaker tack point), normal friction blocks are heavy and take up space. Following on from our success with the MX halyard shackle, Wichard...

Wichard MXL10
Sailboat single friction with lashing max rope 14 mm MXL10 Wichard

When used in conjunction with heavy loads (mastfoot block, spinnaker tack point), normal friction blocks are heavy and take up space. Following on from our success with the MX halyard shackle, Wichard...

Wichard 90105
Sailboat single with swivel 90105 Wichard

Commentary Complete range of blocks Excellent high-speed low load and high-function load characteristics Interchangeable head...

Wichard 90106
Sailboat single with swivel / becket max rope 10 mm 90106 Wichard

Commentary Complete range of blocks Excellent high-speed low load and high-function load characteristics Interchangeable head fastening systems for multiple attachment...

Wichard 93105
Single with swivel for sailboats max line ø 10 mm 93105 Wichard

Commentary Complete range of blocks Excellent high-speed low load and high-function load characteristics Interchangeable head fastening systems for multiple attachment...

72 products Seldén
2 products Eval
Eval 01479-25
Single wire with swivel for sailboats max wire 10 mm 01479-25 Eval

STAINLESS STEEL BLOCKS WITH SINGLE WHEEL AND SWIVEL Code 1479-25 , Dimensions...

Eval 01476-25
Sailboat double with swivel max rope 12 mm 01476-25 Eval

STAINLESS STEEL BLOCKS WITH DOUBLE WHEELS AND SWIVEL Code 1476-25 , Dimensions mm L...

47 products Karver Systems
Karver Systems 150 KG | KBO1
Sailboat single lashing max rope 6 mm 150 KG | KBO1 Karver Systems

KBO lashing blocks have the best size to weight ratio on the market. KBO rope lashing makes fitting easier and quicker than standard shackle LIGHT...

Karver Systems 250 KG | KBO1
Sailboat double lashing max rope 6 mm 250 KG | KBO1 Karver Systems

LIGHTER PURCHASE SYSTEMS Enjoy the KBO benefits by tuning your deck gear. The KBO range is available in double and triple blocks with...

Karver Systems 350 KG | KBO1
Sailboat triple lashing max rope 6 mm 350 KG | KBO1 Karver Systems

LIGHTER PURCHASE SYSTEMS Enjoy the KBO benefits by tuning your deck gear. The KBO range is available in double and triple blocks with...

Karver Systems 220 KG | KBO2
Sailboat single lashing max rope 8 mm 220 KG | KBO2 Karver Systems

KBO lashing blocks have the best size to weight ratio on the market. KBO rope lashing makes fitting easier and quicker than standard shackle LIGHT...

Karver Systems 350 KG | KBO2
Sailboat double lashing max rope 8 mm 350 KG | KBO2 Karver Systems

LIGHTER PURCHASE SYSTEMS Enjoy the KBO benefits by tuning your deck gear. The KBO range is available in double and triple blocks with...

Karver Systems 450 KG | KBO2
Sailboat triple lashing max rope 8 mm 450 KG | KBO2 Karver Systems

LIGHTER PURCHASE SYSTEMS Enjoy the KBO benefits by tuning your deck gear. The KBO range is available in double and triple blocks with...

39 products Ronstan
Ronstan RF64100
Sailboat single with swivel max rope 12 mm RF64100 Ronstan

Class leading performance and sleek, contemporary styling Excellent dynamic and high static load performance Less...

Ronstan RF74140
Sailboat standup single RF74140 Ronstan

Class leading performance and sleek, contemporary styling Excellent dynamic and high static load performance Less...

Ronstan RF25109
Sailboat single lashing max rope 6 mm RF25109 Ronstan

Integrated stainless steel hub to accept lashing...

Ronstan RF45511
Fiddle with Dyneema® fixed head / becket for sailboats max rope 10 mm RF45511 Ronstan

Smart Features * Ultra Lightweight * Low friction 2-stage Orbital ball...

Ronstan RF75151
Single flat cheek for sailboats max rope 12 mm RF75151 Ronstan

Ultra Lightweight Low friction 2-stage Orbital ball bearing...

208 products Holt
Holt 350 KG | HT 92510
Sailing dinghy single with swivel max rope 6 mm 350 KG | HT 92510 Holt

STAINLESS CHEEKS Large window to reduce weight and allow easy rinsing ROLLER BEARING SYSTEM Delrin needle...

Holt 350 KG | HT 92511
Sailing dinghy single with swivel / becket max rope 6 mm 350 KG | HT 92511 Holt

STAINLESS CHEEKS Large window to reduce weight and allow easy rinsing ROLLER BEARING SYSTEM Delrin needle...

Holt 550 KG | HT 92514
Sailing dinghy single with fixed head max rope 6 mm 550 KG | HT 92514 Holt

STAINLESS CHEEKS Large window to reduce weight and allow easy rinsing ROLLER BEARING SYSTEM Delrin needle...

Holt 550 KG | HT 92515
Sailing dinghy single with fixed head / becket max rope 6 mm 550 KG | HT 92515 Holt

STAINLESS CHEEKS Large window to reduce weight and allow easy rinsing ROLLER BEARING SYSTEM Delrin needle...

Holt 600 KG | HT 92534
Sailing dinghy triple with swivel max rope 6 mm 600 KG | HT 92534 Holt

STAINLESS CHEEKS Large window to reduce weight and allow easy rinsing ROLLER BEARING SYSTEM Delrin needle...

Holt 600 KG | HT 92535
Sailing dinghy triple with swivel / becket max rope 6 mm 600 KG | HT 92535 Holt

STAINLESS CHEEKS Large window to reduce weight and allow easy rinsing ROLLER BEARING SYSTEM Delrin needle...

186 products Harken
Harken 376
Sailing dinghy single with fixed head max rope 5 mm 376 Harken

The 16 mm is Harkens® smallest block. It is perfect for small...

Harken 391
Sailing dinghy single with swivelling hook max rope 5 mm 391 Harken

The 16 mm is Harkens® smallest block. It is perfect for small...

Harken 405
Sailing dinghy single with fixed head / becket max rope 5 mm 405 Harken

The 16 mm is Harkens smallest block. It is perfect for small...

Harken 406
Sailing dinghy double with fixed head max rope 5 mm 406 Harken

The 16 mm is Harkens® smallest block. It is perfect...

Harken 407
Sailing dinghy double with fixed head / becket max rope 5 mm 407 Harken

The 16 mm is Harkens® smallest block. It is perfect...

Harken 408
Sailing dinghy triple with fixed head max rope 5 mm 408 Harken

The 16 mm is Harkens smallest block. It is perfect...

Bainbridge international B097
Sailboat triple with swivel / camcleat max rope 6 mm B097 Bainbridge international

Series 19 Micro Blocks offer a compact, comprehensive range for small lines everywhere. The bearings ensure longer life...

Bainbridge international RWR1242
Sailboat single with becket RWR1242 Bainbridge international

Race winning demands for ultimate sail control and rig tensions has generally resulted in far more load on block systems. These hi-performance blocks are specifically...

34 products Antal
Antal MINI 34X6
Sailboat single MINI 34X6 Antal

This series offers extremely high working loads (SWL = 400 Kg) while still compact and lightweight. The sheave is made of resin with a double lateral ball-bearing. Cheekplates are made of perfectly polished...

Antal 50 -  SWL = 600 KG
Sailboat single with swivel 50 - SWL = 600 KG Antal

New by Antal the One Piece Frame block, the block without pins or screws, it is a light and strong solution: simply a hard black anodized and...

Antal SERIE OPF
Sailboat single with swivel SERIE OPF Antal

New by Antal the One Piece Frame block, the block without pins or screws, it is a light and strong solution: simply a hard black anodized and...

Antal 70 - SWL = 1300 KG
Sailboat single with swivel 70 - SWL = 1300 KG Antal

New by Antal the One Piece Frame block, the block without pins or screws, it is a light and strong solution: simply a hard black anodized and...

Antal 80 - SWL = 2200 KG
Sailboat single with swivel 80 - SWL = 2200 KG Antal

New by Antal the One Piece Frame block, the block without pins or screws, it is a light and strong solution: simply a hard black anodized and...

Antal 120 - SWL = 5000 KG
Sailboat single with swivel 120 - SWL = 5000 KG Antal

New by Antal the One Piece Frame block, the block without pins or screws, it is a light and strong solution: simply a hard black anodized and...

19 products Spinlock
Spinlock WL/2
Sailboat single for stanchion WL/2 Spinlock

Compact stanchion lead system Compact furling line guide system Reduces line friction during...

Spinlock BRS/50
Cheek with jamming cam for sailboats max rope 10 mm BRS/50 Spinlock

This jammer block is for situations where a fixed foot block can’t help: peeling spinnakers, or changing...

Spinlock BRS/63
Single cheek with jamming cam for sailboats max rope 12 mm BRS/63 Spinlock

This jammer block is for situations where a fixed foot block can’t help: peeling spinnakers, or changing...

Spinlock T25/2
Sailboat deck organiser (2 sheaves) T25/2 Spinlock

Small boat organiser - 25mm sheaves Symmetric or Asymmetric configurations - 2...

Spinlock T25/3
Sailboat deck organiser (3 sheaves) T25/3 Spinlock

Small boat organiser - 25mm sheaves Symmetric or Asymmetric configurations - 2...

Spinlock T25/4
Sailboat deck organiser (4 sheaves) T25/4 Spinlock

Small boat organiser - 25mm sheaves Symmetric or Asymmetric configurations - 2...

79 products Allen Brothers
Allen Brothers A2020
Sailboat single A2020 Allen Brothers

The Allen 20mm dynamic bearing block is simply the best designed...

Allen Brothers A2021
Sailboat single with fixed head A2021 Allen Brothers

20mm Dynamic Block The Allen 20mm dynamic bearing block is simply the best...

Allen Brothers A2021F
Sailboat single A2021F Allen Brothers

20mm Dynamic Block The Allen 20mm dynamic bearing block is simply the best...

Allen Brothers A2021HK
Sailboat single A2021HK Allen Brothers

20mm Dynamic Block The Allen 20mm dynamic bearing block is simply the best...

Allen Brothers A2022
Sailboat double with fixed head A2022 Allen Brothers

20mm Dynamic Block The Allen 20mm dynamic bearing block is simply the best...

Allen Brothers A2024
Sailboat triple with fixed head A2024 Allen Brothers

20mm Dynamic Block The Allen 20mm dynamic bearing block is simply the best...

59 products Rutgerson
Rutgerson BL = 850 KG
Sailboat double with swivel max rope 8 mm BL = 850 KG Rutgerson

The Rutgerson block assortment is unique in its design and functionallity....

Rutgerson BL = 1250 KG
Sailboat double with swivel max rope 12 mm BL = 1250 KG Rutgerson

The Rutgerson block assortment is unique in its design and functionallity....

Rutgerson BL = 2100 KG
Sailboat double with swivel max rope 14 mm BL = 2100 KG Rutgerson

The Rutgerson block assortment is unique in its design and functionallity....

Rutgerson BL = 850 KG
Sailboat double with swivel / becket max rope 8 mm BL = 850 KG Rutgerson

The Rutgerson block assortment is unique in its design and functionallity....

Rutgerson BL = 1250 KG
Sailboat double with swivel / becket max rope 12 mm BL = 1250 KG Rutgerson

The Rutgerson block assortment is unique in its design and functionallity....

Rutgerson BL = 2100 KG
Sailboat double with swivel / becket max rope 14 mm BL = 2100 KG Rutgerson

The Rutgerson block assortment is unique in its design and functionallity....

5 products Nemo Industrie
Nemo Industrie
Single flat cheek for sailboats high load max rope 24 mm Nemo Industrie

Light anodised alloy and stailess steel AISI 316 with derling...

Nemo Industrie
Flat double cheek for sailboats max rope 12 mm Nemo Industrie

Light anodised alloy and stailess steel AISI 316 with derling...

Nemo Industrie
Sailboat deck organiser (2 sheaves, stacked) Nemo Industrie

Suitable for ropes with max diameter: 14 mm. Anodised...

Nemo Industrie
Sailboat deck organiser (3 sheaves, stacked) Nemo Industrie

Suitable for ropes with max diameter: 14 mm. Anodised...

Nemo Industrie
Sailboat deck organiser (4 sheaves) Nemo Industrie

Suitable for ropes with max diameter: 14 mm. Anodised...

Foresti & Suardi 87A
Sailboat plastic single 87A Foresti & Suardi

Nylon pulleys with brass support Specifications Art....

Foresti & Suardi 87D
Sailboat single with swivel 87D Foresti & Suardi

Nylon pulleys with brass support Specifications Art....

1 products Solimar
Solimar
Wood and bronze for classic sailboats Solimar

From over 20 years Solimar produces wooden, tuphnol, stainless steel blocks bronze fittings for classical boats. All the fittings are made with outer original shape by using modern technologies. Many...

51 products RWO
RWO R1242
Sailboat single with fixed head / becket R1242 RWO

Description:15mm Hi-Per Single & Bkt Category:Blocks Subcategory:15...

RWO R1530
Sailing dinghy single with fixed head max rope 6 mm R1530 RWO

Description:18mm Block Micro Single Category:Blocks Subcategory:17...

RWO R1550
Sailboat single R1550 RWO

Description:18mm Block Micro Single Category:Blocks Subcategory:17...

RWO R1560
Sailing dinghy single with fixed head max rope 6 mm R1560 RWO

Description:18mm Block Micro Single Category:Blocks Subcategory:17...

RWO R1563
Sailing dinghy single with fixed head max rope 6 mm R1563 RWO

Description:Blockmicro Single Category:Blocks Subcategory:17...

RWO R1570
Sailing dinghy double with fixed head max rope 6 mm R1570 RWO

Description:Block Micro Double Category:Blocks Subcategory:17...

Equiplite Europe
Sailboat single snatch Equiplite Europe

Equiplite™ Snatch Blocks use DSK 75 ULTRA loops to take the loads directly through the centre of the sheave....

Equiplite Europe
Sailboat double with fixed head Equiplite Europe

Equiplite™ Dual Sheave Block use DSK 75 ULTRA loops to take the loads directly through the centre of the sheave. This allows the blocks to be extremely...

Equiplite Europe
Sailboat spinnaker single Equiplite Europe

Equiplite™ Spinnaker blocks are similar in design to Equiplite™ snatch blocks but employ...

Equiplite Europe  VHI
Single for sailboat runner VHI Equiplite Europe

Equiplite™ Runner | Mainsheet and Traveler, Blocks For High Performance yachts and especially...

Equiplite Europe  ULTRALIGHT
Sailboat single with fixed head / becket ULTRALIGHT Equiplite Europe

Equiplite™ Runner Becket Blocks. By reducing the maximum on the carbon becket which is possible of the use of the technology...

Equiplite Europe
Sailboat standup single Equiplite Europe

Use Equiplite™ Snatch Blocks in combination with soft deck...

1 2 3 4
Filter by :
Refine the search
Blocks
Extend the search
Search by manufacturer
Search by catalog
Associated Terms

pulleys, pulley wheels, marine blocks, nautical blocks

With NauticExpo you can find a nearby distributor, contact a manufacturer for an estimate or a price, or examine product characteristics and specifications.