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Lifting-Lug Motor Housings
Jiangsu Yufeng Electric Co., Ltd. manufactures motor housings with integrally formed or welded lifting lugs, designed to facilitate safe rigging during assembly, transport, and on-site installation. These housings combine structural integrity with load-rated lifting attachments that comply with recognised rigging standards. The manufacturing process includes precision stamping, robotic welding of lug reinforcements, stress-relief heat treatment, and CNC machining of critical mounting interfaces. With 40 years of motor housing production and a capacity exceeding 5 million units per year, Yufeng supplies lifting-lug housings in IEC and NEMA frame sizes, with custom lug configurations available for specific load requirements and rigging geometries.
Lugs are designed with safety factors of 4:1 or 5:1 based on motor weight. Load ratings are verified through finite element analysis and physical proof-load testing per customer requirements.
Lugs are either stamped integrally with the housing shell or welded with full-penetration joints. Reinforcing gussets are added for high-capacity loads to distribute stress across the housing.
Lug features are incorporated into the manufacturing sequence without disrupting dimensional accuracy. Post-weld stress relief ensures stability of critical bore and mounting surfaces.
Product specifications
| Frame size range | IEC 56 – 160 (NEMA 42–210 with adapter configurations available) |
| Lug configuration | Single-point, two-point, or four-point lifting arrangements |
| Lug material | Same as housing (DC01, SPCC, S235JR) or higher-grade structural steel |
| Safe working load (SWL) | 100 kg – 800 kg per lug (custom ratings available) |
| Safety factor | 4:1 (standard) or 5:1 (upon request) |
| Hole diameter (lifting) | 20 mm – 50 mm, or slotted designs for shackle compatibility |
| Surface coating | Zinc phosphate + e-coat (standard); powder coating or zinc-rich primer optional |
| Flange flatness | ≤ 0.06 mm per 100 mm (post-machining and stress relief) |
| Concentricity (pilot to mounting holes) | ≤ 0.12 mm |
Engineering & design considerations
- Lug placement: Positioned to align with the housing centre of gravity, minimising tilt during lifting. Offset lugs available for motors with unbalanced loads.
- Load testing: Proof-load testing can be performed on each lug to 125 % of SWL. Certificates of test are issued upon request.
- Weld quality: Full-penetration welds with magnetic particle inspection (MPI) available for critical applications.
- Compatibility: Lug hole diameters and slot widths are designed to accommodate standard shackles, hooks, and eyebolts.
Quality assurance & supply chain
- First-pass yield > 98 % on lug position and hole dimensions (Cpk ≥ 1.67).
- Material certificates EN 10204 3.1 and dimensional inspection report per batch.
- Packaging: anti-rust VCI film + corrugated trays; export wooden crates with ISPM 15 certification.
- Lead time: 15–20 working days for standard lug configurations; 25–30 days for custom lug designs or special load ratings.
- PPAP level 3 available for automotive and high-reliability applications.
Application fields
- Industrial motors: Pumps, compressors, fans, and conveyors — where overhead lifting is required for installation and maintenance in plant environments.
- Heavy equipment: Mining, construction, and agricultural machinery — where motor replacement must be performed in the field with mobile cranes.
- Marine and offshore: Motors installed in engine rooms or on deck where lifting points are essential for safe rigging.
- Power generation: Generator sets and turbine auxiliary motors requiring lifting for periodic inspection and overhaul.
For custom lug configurations, Yufeng provides structural FEA and lifting analysis to verify load distribution and rigging safety. Proof-load testing and certification are available for each lug design.
Engineering supportFrequently asked questions
Each lug design is analysed using FEA to determine stress distribution and deflection under load. We perform proof-load testing at 125 % of the safe working load (SWL) upon request, with test certificates issued for each unit or batch.
Yes. We offer custom lug placement to match the centre of gravity of your motor assembly. We can also provide multiple lifting points for large or heavy motors to ensure stable rigging during handling.
Integral lugs are stamped as part of the housing shell, offering a cleaner appearance and eliminating weld seams. Welded lugs allow for higher load capacities and can be fabricated from thicker material. Both options are available with full inspection.
All lugs receive the same surface treatment as the housing — zinc phosphate plus e-coat as standard. For harsh environments, we offer powder coating or zinc-rich epoxy primers with polyurethane topcoats.
We provide material certificates (EN 10204 3.1), dimensional inspection reports, and proof-load test certificates when requested. For special applications, we can supply weld procedure specifications (WPS) and welder qualification records.
Manufacturing Solutions
We offer full-process manufacturing capabilities from steel processing to finished product delivery, supported by stamping lines, automated welding equipment, machining facilities, and inspection instruments. Backed by an engineering team with an average of over 20 years of experience, we provide technical support from development to mass production.
With 40 years of focus on motor housing manufacturing, we have served more than 50 customers and achieved an annual production capacity of over 5 million units. Guided by quality, efficiency, and fast response, we are committed to delivering high-precision and high-reliability motor housing solutions.
