Click to enlargeRonstan Series 50 All Purpose Block - Double
Manufacturer: RonstanPart #: RF51200SKU: 70683
- 12-pin
- 33 ft
- 360°
- Stainless Steel
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Item #: 70683
Category: Blocks
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Description
Series 50 All Purpose Block - Double All purpose (AP) blocks are a great all around solution. Self-lubricating Acetal polymer sheaves running on polished stainless steel races perform equally well with dynamic loads and high static loads.
For durability and a long service life, these blocks are the right choice for sheets, halyards and control line applications for cruising and racing. Swivel shackle head for full 360 degree rotation (non-locking).
Features: Exceptionally high working loads Low maintenance & long service life Self-lubricating Acetal polymer sheave ensures low friction and extreme durability Slotted pin shackle eliminates fouled lines Applications: Mainsheet and halyard applications, vang and spinnaker control lines on boats to (33ft). 10m S60 - on boats up to 40ft, (12m) Materials: Grade 316 stainless steel load strap Impact and UV resistant, fiber reinforced Nylon cheeks Specifications: Sheave Diameter: (inch) 2" / (mm) 50 Max Rope Diameter: (inch) 1/2" / (mm) 12 Pin Diameter: (inch) 1/4" / (mm) 6 Maximum Working Load: (lb) 2200 / (kg) 1000 Breaking Load: (lb) 4410 / (kg) 2000 Weight: (oz) 9.
0 / (g) 255
Specifications
| Brand | Ronstan |
|---|---|
| Part Number | RF51200 |
| EverTide SKU | 70683 |
| UPC | 9316800241231 |
| Connector | 12-pin |
| Material | Stainless Steel |
| Cable Length | 33 ft |
| Beam Angle | 360° |
Specifications are provided by the manufacturer. Confirm fitment for your application before ordering, or contact us and we'll help.
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|---|---|---|---|---|
| Connector | 12-pin | — | — | — |
| Material | Stainless Steel | Stainless Steel | Stainless Steel | Stainless Steel |
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Returns & warranty
Returns are accepted within 30 dayson items that are unused and in their original packaging. Some items may be subject to a manufacturer restocking fee. Special-order items may not be eligible — if you're unsure, ask us before ordering.
Ronstan productscarry the manufacturer's standard warranty. For a warranty claim or a return authorization, see our full returns policy or contact us.
Sailing — frequently asked
- How do I size a block for my sailboat?
- Match the block to the line diameter it will carry and to the working and breaking loads of the system (sheet, halyard, control line). Makers publish load ratings and line-size ranges — choose a block whose working load comfortably exceeds the real-world load, without going so large it adds needless weight.
- What is running rigging?
- Running rigging is the moving lines that control the sails — sheets, halyards, and control lines — as opposed to standing rigging (the fixed wire that holds up the mast). Running rigging should be matched to the boat’s blocks, clutches, and winches for smooth, reliable sail handling.
- How do I maintain sailboat winches and hardware?
- Rinse with fresh water after sailing, keep sheaves and bearings clean, and periodically service winches (disassemble, clean, and re-grease per the maker’s instructions). Marine-grade stainless and good maintenance keep hardware working smoothly when loads are high and timing matters.
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