Underhung Crane 7 Ton S6m H12m NR71 Hoist | Underslung Crane Drawing

The NR71 electric hoist is the mechanism that gives this crane its 7t capacity. Key features:

• 1.5/9.5kW lifting motor: A dual-power motor that provides a slow speed (1.5kW) for precise lifting and a fast speed (9.5kW) for rapid lifting
• 0.8/5.0 m/min lifting speed: Dual lifting speed matches the motor power — 0.8 m/min for precision, 5.0 m/min for speed
• High-capacity wire rope: The wire rope diameter and drum capacity are sized specifically for 7t loads at 12m lift
• Heavy-duty brake: The hoist brake is rated for 7t holding capacity with a safety margin for A5 duty
• 1.0~10 m/min hoist travel: The hoist trolley travels along the girder at up to 10 m/min, driven by a 0.75kW motor
• Remote control: The operator controls the hoist from a safe distance with precise jogging capability

The NR71 hoist is a proven heavy-capacity hoist widely used in underhung cranes for steel, machinery, and industrial applications where 5-10t loads are common.

The 12m lifting height is specified on this underhung crane because:

• Medium-to-high workshops: The building clear height requires a hook travel of 12m to reach loads at various elevations
• Multi-level handling: The 12m hook travel covers multiple working levels — from ground level up to elevated platforms or mezzanine floors
• Extended wire rope reeving: The NR71 hoist drum and wire rope are sized for 12m of hook travel without compromising capacity
• Controlled lifting speed at height: The dual lifting speed (0.8/5.0 m/min) gives precise control when positioning loads at height
• Remote control advantage: At 12m lift height, remote control allows the operator to move to the best viewing position rather than being tied to a pendant cable

If your workshop requires a different lifting height, the NR71 hoist and reeving can be adjusted to match — contact Yuantai with your building clear height for confirmation.

Eight numbers on this underhung crane drawing must match your workshop, or the crane will not fit or operate correctly:

If any of these differ from your workshop, tell Yuantai before ordering — each change affects price and lead time on the underhung crane.

200~450mm rail width is specified for this 7t underhung crane because:

• Wheel diameter Ø150mm — the wheel is designed to run on 200~450mm rail width
• 7t capacity and 6m span: The heavier load creates a larger wheel load (47.2 kN) than a standard 5t crane, requiring a wider, more robust rail
• Underhung crane design: The rail must support the end carriage running on the bottom flange
• 12m high-lift dynamics: The long hook travel adds dynamic forces during lifting and lowering that the rail must handle
• Standard availability: 200~450mm rail width is common for heavy-duty underhung cranes, easy to source and replace

Do not substitute a narrower rail without recalculating the wheel load and dynamic forces. The Ø150mm wheel and 47.2 kN wheel load require 200~450mm rail width or equivalent.

No — this 7t underhung crane is configured for indoor workshop use as an underhung crane, underslung crane, or suspension crane. The crane runs on elevated runway rails supported by the building structure. Outdoor use would require:

• Different crane type: A gantry crane with ground rails and A-frame legs is usually more suitable for outdoor use
• Weather protection: Outdoor-rated electrical enclosures (IP55+) and anti-corrosion treatment
• Wind load design: Anti-wind devices and anchoring — especially important at 12m lift height where wind forces are greater
• Rain cover: Protect the crane, NR71 hoist, motors, and electricals from rain and snow

For outdoor applications, consult Yuantai Cranes for a suitable gantry crane or a weather-protected underhung crane solution.

To avoid surprises at installation, these items are outside the underhung crane supply scope unless you specifically add them:

• Runway rail (200~450mm) and rail fasteners
• Runway beam and building column reinforcement — especially important for the 47.2 kN wheel load
• Building structural support for the 7t capacity and 12m high-lift dynamic forces
• Site power supply up to the crane isolator
• High-bay structural verification (building clear height, roof truss capacity)
• Long wire rope replacement access provision
• Erection crane and site lifting equipment (heavy-load, high-bay installation)
• Local electrical connection and permits

Because the 7t underhung crane operates at 12m lift height with a heavier 47.2 kN wheel load, the building structure and installation access are critical — the runway beam and columns must support the concentrated load at high duty, and the installation must be planned for heavy loads at height. Yuantai can provide runway load drawings and installation guidance as optional items.

Send these eleven items and Yuantai will issue a free custom 7t underhung crane CAD drawing and proposal within 24 hours:

1. Required lifting capacity (t) — e.g., 7t
2. Crane span (m) — e.g., 6m
3. Required lifting height (m) — e.g., 12m
4. Rail width (mm) — e.g., 200~450mm
5. Number of underhung cranes required (e.g., 1 unit)
6. Building clear height and roof structure capacity
7. Power supply (V / Hz / Ph) — e.g., 3P 380V 50Hz
8. Duty class — e.g., A5
9. Control requirement — e.g., remote control only, or pendant + remote
10. Load type and weight (e.g., machinery, steel components, equipment)
11. Any special high-bay or heavy-load requirements

The more complete the list, the faster and more accurate the 7t underhung crane drawing and quote.

This published 7t underhung crane drawing and 3D rendering are a free technical reference — you may use them to plan your workshop and check fit. A project-specific 7t underhung crane GA drawing and 3D model are also free for standard configurations. A design fee may apply only for complex high-bay conditions, non-standard spans, extended hoist reeving design, or specialized customization engineering. The 7t underhung crane drawing remains the property of Yuantai Cranes: unauthorized copying, use, or manufacturing without written authorization is strictly prohibited.