The MHI HASEG Worm Gear Reducer SEOA Seriesis a two‑stage, horizontal‑shaft worm‑gear reducer engineered for applications demanding high overall reduction ratios in a compact footprint. Utilizing MHI HASEG’s precision‑cut Niemann tooth profile and robust materials, the SEOA Series delivers smooth, efficient torque transmission, built‑in self‑locking safety, and simplified maintenance.
Key Features
Two‑Stage Horizontal Shaft Design Dual‑worm stages enable large reduction ratios (iₙ = 63 – 250) within a single, compact housing, ideal for low‑profile machinery and installations with limited vertical space.
Advanced Niemann Tooth Profile The proprietary concave‑convex gear geometry increases tooth contact area and maintains a stable oil film, reducing friction and wear while ensuring high transmission efficiency .
Built‑In Self‑Locking Both worm stages feature low lead angles, preventing back‑driving under load and providing inherent mechanical holding power—crucial for lifting, indexing, and safety‑critical applications.
Robust Construction Hardened alloy‑steel worm shafts and high‑grade bronze worm wheels resist radial and axial shock loads. Housing and shaft fits comply with JIS B1301‑1976 tolerances for precise alignment and minimal backlash.
Efficient Lubrication System Standard splash (immersion) lubrication using KLÜBER “SYNTHESO HT” or “SYNTH GH6” oils ensures continuous gear protection. Separate oil chambers, level gauges, and filler/drain ports for each stage simplify oil management.
Easy Maintenance External grease nipples on bearings allow quick relubrication without disassembly, while JIS‑compliant mounting surfaces facilitate straightforward installation and service.
Typical Specifications
Specification
SEOA Series (Sizes 125–400)
Center Distance (mm)
125, 160, 200, 225, 250, 280, 320, 360, 400
Reduction Ratios (iₙ)
63, 80, 100, 125, 160, 200, 250
Max Input Speed (n₁, min⁻¹)
1 800 / 1 500 / 1 000 / 750 / 500 / 300
Rated Output Torque (T₂N, Nm)
Size‑dependent (consult torque tables)
Efficiency (η)
Up to 80–85 % (ratio‑dependent)
Lubrication
Splash (standard); forced‑lubrication optional
Housing Material
Cast iron
Operating Temperature
–10 °C to +40 °C
Protection Class
IP54 (standard)
Applications
Lifting & Hoisting: Secure, self‑locking high‑ratio drive for winches and hoists.
Conveyors & Material Handling: Precise low‑speed control under heavy loads.
Packaging & Printing: Quiet, compact indexing drives for machines.
Industrial Automation: High‑reduction, space‑saving gearboxes for robotics and assembly.
Textile & Food Processing: Vibration‑free performance in confined horizontal layouts.
Why Choose the SEOA Series?
High Reduction in Minimal Space: Dual stages deliver up to 250:1 ratio without excessive length.
Simplified Integration: JIS‑compliant dimensions and service points streamline installation and upkeep.
Comprehensive Support: Backed by Melink Automation’s local expertise and MHI HASEG’s detailed technical resources.
For torque charts, dimensional drawings, and selection assistance, please consult the MHI HASEG catalog or contact your Melink Automation representative.
MHI HASEG Worm Gear Reducer SEOA Series Size：125~250（Output Shaft Arrangement：Left）
SEOA
Gear Ratio: 63~250
MHI HASEG Worm Gear Reducer SEOA Series Size
125
160
200
225
250
Output Shaft Arrangement：Left
63
SEOA125L-63
SEOA160L-63
SEOA200L-63
SEOA225L-63
SEOA250L-63
80
SEOA125L-80
SEOA160L-80
SEOA200L-80
SEOA225L-80
SEOA250L-80
100
SEOA125L-100
SEOA160L-100
SEOA200L-100
SEOA225L-100
SEOA250L-100
125
SEOA125L-125
SEOA160L-125
SEOA200L-125
SEOA225L-125
SEOA250L-125
160
SEOA125L-160
SEOA160L-160
SEOA200L-160
SEOA225L-160
SEOA250L-160
200
SEOA125L-200
SEOA160L-200
SEOA200L-200
SEOA225L-200
SEOA250L-200
250
SEOA125L-250
SEOA160L-250
SEOA200L-250
SEOA225L-250
SEOA250L-250
MHI HASEG Worm Gear Reducer SEOA Series Size：125~250（Output Shaft Arrangement：Right）
SEOA
Gear Ratio: 63~250
MHI HASEG Worm Gear Reducer SEOA Series Size
125
160
200
225
250
Output Shaft Arrangement：Right
63
SEOA125R-63
SEOA160R-63
SEOA200R-63
SEOA225R-63
SEOA250R-63
80
SEOA125R-80
SEOA160R-80
SEOA200R-80
SEOA225R-80
SEOA250R-80
100
SEOA125R-100
SEOA160R-100
SEOA200R-100
SEOA225R-100
SEOA250R-100
125
SEOA125R-125
SEOA160R-125
SEOA200R-125
SEOA225R-125
SEOA250R-125
160
SEOA125R-160
SEOA160R-160
SEOA200R-160
SEOA225R-160
SEOA250R-160
200
SEOA125R-200
SEOA160R-200
SEOA200R-200
SEOA225R-200
SEOA250R-200
250
SEOA125R-250
SEOA160R-250
SEOA200R-250
SEOA225R-250
SEOA250R-250
MHI HASEG Worm Gear Reducer SEOA Series Size：280~400（Output Shaft Arrangement：Left）
SEOA
Gear Ratio: 63~250
MHI HASEG Worm Gear Reducer SEOA Series Size
280
320
360
400
Output Shaft Arrangement：Left
63
SEOA280L-63
SEOA320L-63
SEOA360L-63
SEOA400L-63
80
SEOA280L-80
SEOA320L-80
SEOA360L-80
SEOA400L-80
100
SEOA280L-100
SEOA320L-100
SEOA360L-100
SEOA400L-100
125
SEOA280L-125
SEOA320L-125
SEOA360L-125
SEOA400L-125
160
SEOA280L-160
SEOA320L-160
SEOA360L-160
SEOA400L-160
200
SEOA280L-200
SEOA320L-200
SEOA360L-200
SEOA400L-200
250
SEOA280L-250
SEOA320L-250
SEOA360L-250
SEOA400L-250
MHI HASEG Worm Gear Reducer SEOA Series Size：280~400（Output Shaft Arrangement：Right）
The MHI HASEG Worm Gear Reducer SEOA200L-80-SB is a high-quality, two-stage reduction unit engineered for superior torque transmission, compact design, and long-term reliability. Combining a helical pre-stage with a worm gear output stage, this model achieves high reduction ratios with smooth, quiet, and efficient performance. The MHI HASEG Worm Gear Reducer SEOA200L-80-SB utilizes MHI HASEG’s advanced Niemann tooth profile, ensuring excellent gear contact, reduced friction, and extended service life even under continuous operation.
The MHI HASEG Worm Gear Reducer SEOA125L-63 is a powerful and efficient solution tailored for heavy-duty applications. Its high torque capacity, durable construction, and efficient performance make it a reliable choice for demanding industrial environments. Whether used in steel processing, mining, or large automation systems, the SEOA125L-63 delivers consistent performance and operational stability, backed by the quality and expertise of MHI HASEG CO., LTD.
The MHI HASEG Worm Gear Reducer SEOA125R-63 is a robust, efficient, and versatile gear reducer ideal for a wide range of industrial applications. Its high efficiency, durable construction, and easy maintenance make it a reliable choice for industries seeking to optimize their mechanical systems. With support from HMI HASEG CO., LTD. and distribution through Melink Automation, users can be assured of quality and timely service for their gear reducer needs.
