Sailing Single Blocks
- Ronstan®30 Series Acetal Sheave Single Utility Block with Swivel Shackle for 3/8" D Lines (RF467)30 Series Acetal Sheave Single Utility Block with Swivel Shackle for 3/8" D Lines by Ronstan®. Stainless steel cheeks and Acetal sheaves ensure a long service life with virtually no maintenance. Hollow rivets in the block heads can be...Lightweight durable constructionEconomical$26.85
- Ronstan®30 Series Acetal Sheave Single Utility Block with Tube Rivet Head for 5/16" D Lines (RF185)30 Series Acetal Sheave Single Utility Block with Tube Rivet Head for 5/16" D Lines by Ronstan®. Stainless steel cheeks and Acetal sheaves ensure a long service life with virtually no maintenance. If you’re an avid sailboat enthusiast...Lightweight durable constructionEconomical$17.78
- Ronstan®30 Series Ball Bearing Shave Single Utility Block with Becket & Loop Head for 5/16" D Lines (RF30111)30 Series Ball Bearing Shave Single Utility Block with Becket & Loop Head for 5/16" D Lines by Ronstan®. Sheaves running on Acetal or Torlon® ball bearings provide high performance & low friction. The 2-stage ball bearing system...Low friction 2-stage ball bearing system provides consistent performance over the full working load rangeHigh static and dynamic load capacity$30.99
- Ronstan®30 Series Ball Bearing Shave Single Utility Block with Becket & Swivel Shackle for 5/16" D Lines (RF30110)30 Series Ball Bearing Shave Single Utility Block with Becket & Swivel Shackle for 5/16" D Lines by Ronstan®. Sheaves running on Acetal or Torlon® ball bearings provide high performance & low friction. The 2-stage ball bearing system...Low friction 2-stage ball bearing system provides consistent performance over the full working load rangeHigh static and dynamic load capacity$46.94
- Ronstan®30 Series Ball Bearing Shave Single Utility Block with Loop Head for 5/16" D Lines (RF30101)30 Series Ball Bearing Shave Single Utility Block with Loop Head for 5/16" D Lines by Ronstan®. Sheaves running on Acetal or Torlon® ball bearings provide high performance & low friction. The 2-stage ball bearing system provides...Low friction 2-stage ball bearing system provides consistent performance over the full working load rangeHigh static and dynamic load capacity$19.97
- Ronstan®30 Series Ball Bearing Shave Single Utility Block with Stand-Up Head for 5/16" D Lines (RF30141)30 Series Ball Bearing Shave Single Utility Block with Stand-Up Head for 5/16" D Lines by Ronstan®. Sheaves running on Acetal or Torlon® ball bearings provide high performance & low friction. The 2-stage ball bearing system provides...Low friction 2-stage ball bearing system provides consistent performance over the full working load rangeHigh static and dynamic load capacity$26.19
- Ronstan®30 Series Ball Bearing Shave Single Utility Block with Swivel Shackle for 5/16" D Lines (RF30100)30 Series Ball Bearing Shave Single Utility Block with Swivel Shackle for 5/16" D Lines by Ronstan®. Sheaves running on Acetal or Torlon® ball bearings provide high performance & low friction. The 2-stage ball bearing system provides...Low friction 2-stage ball bearing system provides consistent performance over the full working load rangeHigh static and dynamic load capacity$29.46
- Ronstan®30 Series High Load Exit Box for Single 5/16" D Rope or 5/32" D Wire (RF31712)30 Series High Load Exit Box for Single 5/16" D Rope or 5/32" D Wire by Ronstan®. Ronstan manufactures an extensive range of sheave boxes for use with rope and wire. Plain bearing sheaves are ideal for halyards and other applications...Ideal for applications where lines (rope or wire) need to be led through decks, bulkheads or spars minimising friction and chafingNylatron® sheave$29.46
- Ronstan®30 Series Orbitblock™ Ball Bearing Shave Single Utility Block for 5/16" D Lines (RF35109HL)30 Series Orbitblock™ Ball Bearing Shave Single Utility Block for 5/16" D Lines by Ronstan®. Ball Bearing Orbit Blocks™ boast the highest strength-to-weight ratio available. This is achieved through all-composite reinforced polymer...High quality at an affordable priceExpertly made from premium materials$104.98
- Ronstan®30 Series Orbitblock™ Ball Bearing Shave Single Utility Block with Becket & Lashing for 5/16" D Lines (RF35101)30 Series Orbitblock™ Ball Bearing Shave Single Utility Block with Becket & Lashing for 5/16" D Lines by Ronstan®. Ball Bearing Orbit Blocks™ boast the highest strength-to-weight ratio available. This is achieved through...LightweightHighest working load in its class$15.28
- Ronstan®30 Series Orbitblock™ Ball Bearing Shave Single Utility Block with Becket & Swivel Shackle for 5/16" D Lines (RF35100)30 Series Orbitblock™ Ball Bearing Shave Single Utility Block with Becket & Swivel Shackle for 5/16" D Lines by Ronstan®. Ball Bearing Orbit Blocks™ boast the highest strength-to-weight ratio available. This is achieved through...LightweightHighest working load in its class$21.83
- Ronstan®30 Series Orbitblock™ Ball Bearing Shave Single Utility Block with Cheek & Eye for 5/16" D Lines (RF35151)30 Series Orbitblock™ Ball Bearing Shave Single Utility Block with Cheek & Eye for 5/16" D Lines by Ronstan®. Ball Bearing Orbit Blocks™ boast the highest strength-to-weight ratio available. This is achieved through all-composite...LightweightHighest working load in its class$17.46
- Ronstan®30 Series Orbitblock™ Ball Bearing Shave Single Utility Block with Swivel Stand-Up Head for 5/16" D Lines (RF35140)30 Series Orbitblock™ Ball Bearing Shave Single Utility Block with Swivel Stand-Up Head for 5/16" D Lines by Ronstan®. Ball Bearing Orbit Blocks™ boast the highest strength-to-weight ratio available. This is achieved through...LightweightHighest working load in its class$28.38
- Ronstan®40 Series 10 mm Acetal Solid Bearing Sheave for 3/8" D Lines (RF41000)40 Series 10 mm Acetal Solid Bearing Sheave for 3/8" D Lines by Ronstan®. Ronstan's range of Acetal sheaves is moulded from a specially modified ultra-violet resistant grade of material to provide a long service life in the tough marine...High strength and durability, utilizing the self-lubricating properties of AcetalU.V. resistant acetal sheaves$7.63
- Ronstan®40 Series Acetal Sheave Single Fiddle Block with Becket & Swivel Shackle for 5/16" D Lines (RF41510)40 Series Acetal Sheave Single Fiddle Block with Becket & Swivel Shackle for 5/16" D Lines by Ronstan®. All purpose (AP) blocks are a great all around solution. Self-lubricating Acetal polymer sheaves running on polished stainless steel...Exceptionally high working loadsLow maintenance, long service life$51.31
- Ronstan®40 Series Acetal Sheave Single Fiddle Block with Becket, Cam Cleat & Swivel Shackle for 5/16" D Lines (RF41530)40 Series Acetal Sheave Single Fiddle Block with Becket, Cam Cleat & Swivel Shackle for 5/16" D Lines by Ronstan®. All purpose (AP) blocks are a great all around solution. Self-lubricating Acetal polymer sheaves running on polished...Exceptionally high working loadsLow maintenance, long service life$104.82
- Ronstan®40 Series Acetal Sheave Single Fiddle Block with Cam Cleat & Swivel Shackle for 5/16" D Lines (RF41520)40 Series Acetal Sheave Single Fiddle Block with Cam Cleat & Swivel Shackle for 5/16" D Lines by Ronstan®. All purpose (AP) blocks are a great all around solution. Self-lubricating Acetal polymer sheaves running on polished stainless...Exceptionally high working loadsLow maintenance, long service life$101.55
- Ronstan®40 Series Acetal Sheave Single Fiddle Block with Swivel Shackle for 5/16" D Lines (RF41500)40 Series Acetal Sheave Single Fiddle Block with Swivel Shackle for 5/16" D Lines by Ronstan®. All purpose (AP) blocks are a great all around solution. Self-lubricating Acetal polymer sheaves running on polished stainless steel races...Exceptionally high working loadsLow maintenance, long service life$48.03
- Ronstan®40 Series Acetal Sheave Single Upright Lead Block for 3/8" D Lines (RF41171)40 Series Acetal Sheave Single Upright Lead Block for 3/8" D Lines by Ronstan®. Lead blocks are a low profile solution for leading halyards or other rig sail controls back to cleats or jammers.Ideal for high load applications. Wear...Typically used for halyards at the mast baseUV stabilised acetal sheave$43.67
- Ronstan®40 Series Acetal Sheave Single Utility Block with Becket & Loop Head for 3/8" D Lines (RF41111)40 Series Acetal Sheave Single Utility Block with Becket & Loop Head for 3/8" D Lines by Ronstan®. All purpose (AP) blocks are a great all around solution. Self-lubricating Acetal polymer sheaves running on polished stainless steel...Exceptionally high working loadsLow maintenance, long service life$28.38
- Ronstan®40 Series Acetal Sheave Single Utility Block with Becket & Swivel Shackle for 3/8" D Lines (RF41110)40 Series Acetal Sheave Single Utility Block with Becket & Swivel Shackle for 3/8" D Lines by Ronstan®. All purpose (AP) blocks are a great all around solution. Self-lubricating Acetal polymer sheaves running on polished stainless steel...Exceptionally high working loadsLow maintenance, long service life$30.56
- Ronstan®40 Series Acetal Sheave Single Utility Block with Cheek for 1/8" D Lines (RF41811)40 Series Acetal Sheave Single Utility Block with Cheek for 1/8" D Lines (RF41811) by Ronstan®. All purpose (AP) blocks are a great all around solution. Self-lubricating Acetal polymer sheaves running on polished stainless steel races...Exceptionally high working loadsLow maintenance, long service life$80.80
- Ronstan®40 Series Acetal Sheave Single Utility Block with Cheek for 1/8" D Lines (RF41151)40 Series Acetal Sheave Single Utility Block with Cheek for 1/8" D Lines (RF41151) by Ronstan®. All purpose (AP) blocks are a great all around solution. Self-lubricating Acetal polymer sheaves running on polished stainless steel races...Exceptionally high working loadsLow maintenance, long service life$32.74
- Ronstan®40 Series Acetal Sheave Single Utility Block with Loop Head for 3/8" D Lines (RF41101)40 Series Acetal Sheave Single Utility Block with Loop Head for 3/8" D Lines by Ronstan®. All purpose (AP) blocks are a great all around solution. Self-lubricating Acetal polymer sheaves running on polished stainless steel races perform...Exceptionally high working loadsLow maintenance, long service life$18.55
- Ronstan®40 Series Acetal Sheave Single Utility Block with Stand-Up Head for 3/8" D Lines (RF41140)40 Series Acetal Sheave Single Utility Block with Stand-Up Head for 3/8" D Lines by Ronstan®. All purpose (AP) blocks are a great all around solution. Self-lubricating Acetal polymer sheaves running on polished stainless steel races...Exceptionally high working loadsLow maintenance, long service life$32.74
- Ronstan®40 Series Acetal Sheave Single Utility Block with Swivel Shackle for 3/8" D Lines (RF41100)40 Series Acetal Sheave Single Utility Block with Swivel Shackle for 3/8" D Lines by Ronstan®. All purpose (AP) blocks are a great all around solution. Self-lubricating Acetal polymer sheaves running on polished stainless steel races...Exceptionally high working loadsLow maintenance, long service life$21.83
- Ronstan®40 Series Ball Bearing Sheave Single Fiddle Block with Becket & Swivel Shackle for 5/16" D Lines (RF40510)40 Series Ball Bearing Sheave Single Fiddle Block with Becket & Swivel Shackle for 5/16" D Lines by Ronstan®. Sheaves running on Acetal or Torlon® ball bearings provide high performance & low friction. The 2-stage ball bearing system...Low friction Acetal or Torlon® bearing systemLightweight$58.95
- Ronstan®40 Series Ball Bearing Sheave Single Fiddle Block with Becket, Cam Cleat & Swivel Shackle for 5/16" D Lines (RF40530)40 Series Ball Bearing Sheave Single Fiddle Block with Becket, Cam Cleat & Swivel Shackle for 5/16" D Lines by Ronstan®. Sheaves running on Acetal or Torlon® ball bearings provide high performance & low friction. The 2-stage ball...Low friction Acetal or Torlon® bearing systemLightweight$92.80
- Ronstan®40 Series Ball Bearing Sheave Single Fiddle Block with Cam Cleat & Swivel Shackle for 5/16" D Lines (RF40520)40 Series Ball Bearing Sheave Single Fiddle Block with Cam Cleat & Swivel Shackle for 5/16" D Lines by Ronstan®. Sheaves running on Acetal or Torlon® ball bearings provide high performance & low friction. The 2-stage ball bearing...Low friction Acetal or Torlon® bearing systemLightweight$89.53
- Ronstan®40 Series Ball Bearing Sheave Single Fiddle Block with Swivel Shackle for 5/16" D Lines (RF40500)40 Series Ball Bearing Sheave Single Fiddle Block with Swivel Shackle for 5/16" D Lines by Ronstan®. Sheaves running on Acetal or Torlon® ball bearings provide high performance & low friction. The 2-stage ball bearing system provides...Low friction Acetal or Torlon® bearing systemLightweight$54.59
Blocks are essential devices in sailing. Essentially, a block is a pulley; typically, it consists of a frame containing a grooved wheel that can accommodate a line. Assemblies with only one wheel or sheave are called single blocks. You can find them all over a sailboat; they are used to lift loads or maneuver sheets with minimal friction regardless of which direction the rope moves in. They can also be used in combination. Single sailing blocks can be made of different materials, including metal, wood, and plastic. Typically, their names imply their function.
For example, there are fiddle, linked, shock, spinnaker, utility, and simple sheave blocks, among other types. On our virtual shelves, we have selected a broad choice of quality single sailing blocks to fit every type of vessel. The features defining the blocks include the line diameter, sheave type, maximum load, and other specific characteristics. Depending on the purpose and task, there are blocks with a back plate, becket, snap shackle, and swivel fork, among others. We offer exclusive products made by trusted companies, tested to meet or exceed industry standards, and built to deliver performance and long-lasting efficiency.