Click to enlargeRonstan Series 50 All Purpose Block - Single - Universal Head
Manufacturer: RonstanPart #: RF51100SKU: 55253
- 650 lb
- Stainless Steel
Add $62.48 more to qualify for free shipping.
Item #: 55253
Category: Blocks
● In stock — ships fast from US warehouses
- Ships from US warehouses
- Free shipping on orders over $99
- Secure checkout — your info is protected
- Genuine marine-brand parts, not knockoffs
- 30-day returns
- Marine parts support — we know boats
Description
Series 50 All Purpose Block - Single - Universal Head 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. Captive Lock™ universal head can be fixed in either of two planes, or free to swivel as required Features: Exceptionally high working loads Low maintenance, long service life Self lubricating sheave Captive Lock™ universal head Slotted pin shackle eliminates fouled lines Applications: Mainsheet and halyard applications, vang and spinnaker control lines on boats to 10M(33') Materials: Nylatron® sheave Grade 316 stainless steel load strap and head fitting Impact and U.
V. resistant, fiber reinforced Nylon cheeks Specifications: Sheave Ø: 50mm(2") Max.
Rope Ø: 12mm(1/2") Max. Pin Ø: 5mm(3/16") M.
W. L.
: 750kg(1,650lbs) B. L.
: 1,500kg(3,310lbs) Weight: 118g(4. 1oz)
Specifications
| Brand | Ronstan |
|---|---|
| Part Number | RF51100 |
| EverTide SKU | 55253 |
| UPC | 9316800241101 |
| Material | Stainless Steel |
Specifications are provided by the manufacturer. Confirm fitment for your application before ordering, or contact us and we'll help.
Compare similar products
Complete your setup
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.
Customer reviews
No reviews yet — this product.
Fast shipping
Ships from US warehouses — free over $99
The right part
Marine-grade parts matched to your boat
Real support
Questions? We know boats — call or email