Helffer 2 Pack 35mm Double Pulley Block, 316 Stainless Steel (5/16" Rope) — Open-Box, 5% Off

【Create a powerful 4:1 mechanical advantage system】:Lift heavier with less effort. Unlike single pulleys, this 2-pack set of double-sheave blocks is designed to work together. By rigging them with rope, you can build a highly efficient block and tackle hoist that reduces the lifting weight by up to 75% (4:1 ratio)—ideal for effortlessly hoisting kayaks, bikes, or heavy storage boxes to your ceiling. 【Hybrid 316 stainless steel & reinforced nylon】:The best of both worlds. The load-bearing shackle and axles are forged from 316 Marine Grade Stainless Steel for excellent rust resistance, while the body is molded from high-strength Reinforced PA66 Nylon. This composite design makes the pulley highly corrosion-resistant and ideal for saltwater marine rigging or outdoor camping setups. 【Lightweight, silent & surface-friendly】:Strength without the bulk. The nylon body makes these M35 blocks significantly lighter than all-metal alternatives, reducing sag in your lines. Plus, the soft nylon housing won't scratch your boat deck, car roof, or paintwork if it swings against them, and the self-lubricating wheels operate silently without metal squeaking. 【Stable fixed eye for tangle-free rigging】:Essential for double pulley systems. The top U-shackle pivots 180 degrees but maintains a fixed orientation (non-swivel). This is a crucial feature when running four strands of rope in a hoist system, as it prevents the block from spinning and twisting the lines into a knot, ensuring a smooth, straight lift every time. 【High capacity compact 35mm design】:Small size, heavy lift. Despite its compact 35mm wheel size (Total Length: 95mm), the double-axle structure supports a Safe Working Load of 250kg (550 lbs) and a Breaking Load of 1500 lbs (680 kg). The U-grooves are optimized to securely grip paracord and braided ropes up to 8mm (5/16 inch), preventing slippage during operation.

When You Need More Power and Silence: The Helffer Heavy Duty Pulley Block Series.

For demanding projects where standard metal pulleys screech, rust, or come up short, the Helffer Block delivers the strength and smooth operation you need. Designed for heavy lifting, silent gym cable systems, and harsh marine environments.

Advanced Hybrid Construction
We combine a Reinforced PA66 Nylon Body (for ultra-quiet operation and rope protection) with Marine-Grade T316 Stainless Steel Hardware (for the swivel and axle). The result? A block that is lighter than traditional iron, highly durable, eliminates burrs that fray ropes, and is exceptionally rust-resistant even in saltwater conditions.

The Signature Lockable Swivel
Unlike basic pulleys, our swivel head gives you choices. Leave the hex screw loose for 360-degree free rotation to prevent your ropes from twisting under heavy loads. Or, tighten the screw to lock the swivel at a specific angle for highly stable, directional line feeding.

Choose Your Right Size (Technical Specifications):

[ 35mm Size Specs ]
- Sheave Diameter: 35mm
- Safe Working Load (WLL): 270kg / 600 lbs
- Breaking Load: 680kg / 1500 lbs
- Max Rope Compatibility: Fits up to 10mm (3/8 inch)
- Best For: Home gyms, weighted pull-ups, heavy bag hanging, shade sails, and DIY wire setups.

[ 50mm Size Specs ]
- Sheave Diameter: 50mm (2 inches)
- Safe Working Load (WLL): 408kg / 900 lbs
- Breaking Load: 1500kg / 3300 lbs
- Max Rope Compatibility: Fits up to 12mm (1/2 inch)
- Best For: Commercial gym replacements, heavy garage hoists, arborist tree rigging, and boat anchors.