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Schaefer Marine 504-05 Single Block 51mm Sheave Aluminum Cheeks Delrin Bearing

Manufacturer

Schaefer Marine

<h3>About Schaefer Marine</h3><p>Founded in 1966 and headquartered in <strong>New Bedford, Massachusetts</strong>, Schaefer Marine has spent decades earning a reputation as one of the most trusted names in sailboat hardware. Whether you sail a small dinghy or a bluewater passage-maker, the brand's commitment to engineering products that can withstand the relentless forces of wind and sea has made it a go-to choice for racing sailors and cruisers alike.</p><p>What distinguishes Schaefer Marine from the competition is a no-compromise philosophy toward materials and design. Every product in the lineup — from travelers and furling systems to cleats, shackles, and mast hardware — is conceived with a real-world understanding of the loads a sailing vessel generates. The result is hardware that performs smoothly under pressure and keeps performing long after less-robust alternatives have been retired.</p><h3>Blocks &amp; Pulleys: The Heart of Sail Trim</h3><p>Schaefer Marine's <a href="/14859-schaefer-marine-pulleys-blocks-200822">Pulleys &amp; Blocks</a> are among the brand's most celebrated product lines. The flagship <strong>M-Series blocks</strong> feature Torlon&trade; rollers and Delrin&trade; ball bearings housed in machined aluminum bodies, delivering a smooth, low-friction ride that sail trimmers notice immediately. The range spans everything from simple fixed blocks to ratchet and swivel variants, covering boats of every size. For sailors looking to refine their sheet and halyard systems, Schaefer's <a href="/14859-schaefer-marine-pulleys-blocks-202394">block and pulley selection</a> offers a variety of configurations purpose-built for efficient sail control.</p><h3>Eye Straps &amp; Pad Eyes: Secure, Reliable Deck Fittings</h3><p>Deck attachment points endure some of the highest stress loads on any sailboat, which is why Schaefer Marine invests heavily in the quality of its <a href="/14859-schaefer-marine-eye-straps-pad-eyes-201942">Eye Straps &amp; Pad Eyes</a>. The brand offers cast and welded pad eyes machined from high-quality Type 316 stainless steel, along with stamped eye straps crafted from Type 304 stainless — all paired with corresponding backing plates for secure, load-spreading installations. Whether securing a block, lashing a line, or anchoring deck equipment, these fittings are engineered to hold.</p><h3>A Full Ecosystem of Sailing Hardware</h3><p>Beyond blocks and deck fittings, Schaefer Marine produces a comprehensive catalog that includes jib furlers, mainsail travelers, cam cleats, snap shackles, Tuff Luff foil systems, winch handles, and mast hardware. The brand also partners with SeaSure (UK) for rudder hardware and the Hawk Wind Indicator range, rounding out an ecosystem that can outfit virtually any sailboat from deck to masthead.</p><p>Standard catalog products from Schaefer Marine are backed by a <strong>ten-year warranty</strong> against factory defects in material and workmanship — a statement of confidence that reflects the brand's long-standing focus on building hardware that lasts. For sailors who demand proven reliability in demanding conditions, Schaefer Marine continues to set the benchmark.</p>

Part Number

504-05
07/13/2036 4:05 AM
Sale Price

$82.38

In Stock (5)

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Product Details

The Schaefer Marine 504-05 is a high-performance single block designed for sailboats and rigging applications where strength and smooth operation are essential. This 5 Series block features anodized aluminum cheeks for corrosion resistance and durability in harsh marine environments, combined with a Delrin™ plain bearing sheave that ensures reliable, low-friction performance.

Key Features:

  • Anodized aluminum cheeks provide excellent strength-to-weight ratio and corrosion resistance
  • Delrin™ plain bearing sheave delivers smooth operation with minimal maintenance
  • Swivel head design with locking capability prevents line twist and allows fixed positioning when needed
  • Compact design with 51mm (2") sheave diameter suitable for control lines and light-duty halyards
  • High safe working load of 1,750 lbs (795 kg) for reliable performance

Specifications:

  • Sheave Diameter: 2" (51mm)
  • Thickness: 15/16" (24mm)
  • Width: 2 1/8" (54mm)
  • Length: 4 13/32" (112mm)
  • Safe Working Load: 1,750 lbs (795 kg)
  • Weight: 5 oz (142g)
  • Maximum Line Size: 7/16" (11mm)

Ideal for mainsheet systems, jib sheets, halyards, and general deck rigging applications on cruising and racing sailboats.

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