Manual Chain Block 3T
A Manual Chain Block 3T (or 3-tonne hand chain hoist) is a portable lifting device designed to raise, lower, and hold heavy loads up to 3,000 kilograms (6,613 lbs) using manual mechanical advantage. Because they operate purely on human power through a internal gear reduction system, they are highly prized in construction sites, garages, workshops, ship engine rooms, and remote locations where electricity is unavailable
Description
Manual Chain Block 3T (or 3-tonne hand chain hoist)
Core Safety Features
- Weston-Style Dual-Pawl Brake: Employs an automatic double-pawl braking system that splits the mechanical load evenly across opposite sides of the gear mechanism. This locks the chain securely at any point in the lifting range the moment the operator stops pulling.
- 360° Swivel Hooks with Latches: Both the top mounting hook and bottom load hook are drop-forged, heat-treated steel, built to stretch slowly rather than break under extreme overload. They rotate a full 360 degrees to prevent the load chain from twisting and include spring-loaded safety catches to prevent accidental unhooking.
- Overload Protection (Optional Clutch): Select premium models incorporate a slip-clutch device that prevents the hoist from operating if a load severely exceeds the 3-ton threshold, protecting both the operator and the gear array.
Mechanical Efficiency & Performance
- Triple-Spur Reduction Gears: Features a precision-engineered, double-stage spur gear reduction system. This multiplies manual force, requiring only about 34 to 38 kg of pull effort to lift a maximum 3,000 kg load.
- Anti-Snag Chain Guides: Equipped with integrated guide rollers and a floating handwheel cover. These parts align the incoming chain perfectly onto the internal sprocket to completely eliminate jamming, binding, or slipping.
- High-Efficiency Ball Bearings: Built with caged roller or ball bearings on the internal shafts to maximize mechanical efficiency, giving the user a smoother, less fatiguing pull experience.
Materials & Build Quality
- Grade 80 (G80) Alloy Steel Load Chain: The heavy-duty load-bearing chain is constructed from hardened manganese steel alloy. It typically features a black oxide or zinc-galvanized finish to offer severe corrosion resistance when operating in rain, mud, or chemical environments.
- Corrosion-Protected Hand Chain: The pulling loop uses a bright zinc-plated finish to protect the steel from sweat, humidity, and hand oils.
- Impact-Resistant Steel Cover: The inner gear system is fully enclosed by a stamped, cold-rolled carbon steel outer shell. This protects the gears from external dust, debris, and structural impacts on busy construction sites
Specification
| Parameter | Specification Details |
|---|---|
| Hooks | Drop-forged steel with 360° swivel & safety latches |
| Performance | Working Load Limit (WLL) 3 Tons / 3,000 kg / 6,600 lbs |
| Braking System | Automatic Weston-style dual-pawl mechanical brake |
| Internal Gears | Triple-spur heat-treated steel gears with roller bearings |
| Proof Test Load | 45 kN / 4,500 kg (1.5x Rated Capacity) |
| Load Chain Grade | Grade 80 (G80) or Grade 100 Alloy Steel |
| Hand Chain Diameter | 5.0 mm |
| Hook Throat Opening | 38 mm – 42 mm (1.50" – 1.65") |
| Sizing & Weight | Standard Lift Heights 3 meters (10 ft) or 6 meters (20 ft) |
| Chain Specifications | Load Chain Diameter 7.1 mm to 8.0 mm |
| Materials & Build | Housing Shell Rugged steel construction with multiple through-bolts |
| Specification Category | Parameter Standard Value / Measurement |
| Net Weight (with 3m Lift) | 21 kg – 26 kg (46.2 lbs – 57.2 lbs) |
| Regulatory Certifications | CE, GS, ISO9001, EN13157 |
| Operating Temperature Range | -40°C to +60°C (-40°F to 140°F) |
| Effort Required to Lift Max Load | 332 N to 370 N (approx. 34–38 kg of pull force) |
| Added Weight per Meter of Extra Lift | ~2.2 kg to 2.8 kg per additional meter |
| Number of Load Chain Falls (Strands) | 1 or 2 strands (usually 2 falls for safety distribution) |
| Headroom (Min. Hook-to-Hook Distance) | 480 mm – 520 mm (18.9" – 20.5") |
Related Products
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