Series 50 All-Purpose Single Block
General application blocks provide performance and value.
A smooth and efficient block is critical to the conversation between sailor and boat—especially for hand-held control lines. Ronstan designed the Series 50 All-Purpose blocks to give dinghy and small keelboat sailors the feedback to detect subtle wind changes and sail as efficiently as possible. These light-weight blocks feature a durable, self-lubricating, UV stable acetal sheave that runs smoothly on a 316 stainless steel bearing. Fiber reinforced nylon cheeks provide rigidity and strength and are beefed up 316 stainless steel load straps. The included shackle features a pin with a low-profile head to prevent snagging on smaller lines. Get the messages your boat sends you though the lines by using efficient and smooth Ronstan Series 50 All-Purpose blocks.
This 50mm single with shackle head is versatile and can be used for a wide range of applications. Great for halyard tuners, Cunninghams, dinghy sheets and more.
- Light weight blocks designed for moderate to high static and dynamic loads
- Ideal for hand-held control lines
- Captive lock secures swivel at 0° or 90° or left to swivel freely
- Sliding acetal bearing on 316 stainless steel race handles high loads and maintains low friction
- Fiber reinforced nylon cheeks to add strength while reducing weight
- Self-lubricating, UV stable acetal sheave is strong and light-weight
- 316 stainless steel load straps add strength
- Ideal for:
- Dinghy and small keelboat sheets
- Halyard tuning systems
- Backstay systems on dinghies and smaller keelboats
- Boom vangs (cascade systems)
Ronstan Selection Guide
|Sheave Diameter||Line Compatibility||Shackle Pin Diameter|
|50mm||1/2" (12mm)||3/16" (1/4" for Double and Triple blocks)|
Series 50 All-Purpose Single Block
|Ball Bearings||Low Friction Bearings|
|Diameter||1/2 Inch or 13 mm|
|Integral Cleat||No Integral Cleat|
|Mount Type||Swivel Shackle|
|Safe Working Load||1650 Pounds|
|Sheave Diameter||50 mm|
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