Click to enlargeSchaefer Single Aluminum Block - 51mm Sheave
Manufacturer: Schaefer MarinePart #: 504-05SKU: 74715
- 1750 lb
- Aluminum
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Item #: 74715
Category: Blocks
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Description
Single Aluminum Block - 51mm Sheave Single block with anodized aluminum cheeks. Delrin™ sheave ensures smooth operation with high safe working load.
Swivel head may be locked in place to avoid twist. Specifications: Sheave Dia.
2" (51mm) Thickness 15/16" (24mm) Width 2 1/8" (54mm) Length 4 13/32" (112mm) SWL 1750 lbs. (795kg) Weight 5oz.
(142g) Max. Line size 7/16" (11mm)
Specifications
| Brand | Schaefer Marine |
|---|---|
| Part Number | 504-05 |
| EverTide SKU | 74715 |
| UPC | 740507011580 |
| Material | Aluminum |
Specifications are provided by the manufacturer. Confirm fitment for your application before ordering, or contact us and we'll help.
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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.
Schaefer Marine 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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