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The MHI HASEG Worm Gear Reducer SCUA Series is a compact, single-stage horizontal-shaft reducer with a hollow output shaft, offering space-saving installation and reliable torque transmission for a wide range of industrial applications. Engineered with MHI HASEG’s advanced Niemann tooth profile, the SCUA Series ensures high efficiency, quiet operation, and excellent self-locking performance in compact equipment and low-speed drive systems.

Key Features
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Horizontal Hollow-Shaft Configuration
The SCUA Series features a horizontal input shaft and a hollow output shaft, allowing direct mounting onto driven shafts without couplings. This design reduces installation complexity and saves space in machinery layouts.
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Advanced Niemann Tooth Profile
The concave-convex Niemann gear design offers greater tooth contact area and oil film retention, minimizing wear and increasing operational efficiency. It ensures smooth, low-noise operation, even under load.
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Built-In Self-Locking Safety
With a low lead-angle worm gear, the SCUA Series prevents reverse motion, delivering inherent mechanical holding power without additional braking mechanisms—ideal for systems requiring position stability.
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Compact and Durable Structure
Despite its small size, the SCUA Series is built with hardened alloy steel worm shafts and high-strength bronze worm wheels, offering durability and reliable performance under light to moderate loads.
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Simplified Maintenance
Standard splash lubrication using Klüber SYNTHESO HT or SYNTH GH6 synthetic oil provides continuous gear protection. Grease nipples and easy-access filler/drain ports make routine maintenance quick and efficient.
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Standardized Dimensions (JIS)
All mounting surfaces and shaft fits comply with JIS B1301-1976 tolerances, ensuring smooth integration into existing machinery and easy interchangeability.
Typical Specifications
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Specification
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SCUA Series
|
| Shaft Orientation |
Horizontal (input), hollow output |
| Center Distance (mm) |
65, 80, 100, 125, 160 |
| Reduction Ratios (iₙ) |
5, 6.3, 8, 10, 12.5, 16, 20, 25, 31.5, 40, 50 |
| Rated Output Torque (T₂N, Nm) |
180–1,000 Nm (size-dependent) |
| Max Input Speed (n₁, min⁻¹) |
Up to 1,800 |
| Efficiency (η) |
Up to 90% |
| Lubrication |
Splash (standard, Klüber oil) |
| Housing Material |
Cast iron |
| Operating Temperature |
–10 °C to +40 °C |
| Protection Class |
IP54 (standard) |
Applications
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Compact Conveyors: Direct mounting with minimal installation space.
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Packaging & Labeling Equipment: Quiet, stable operation with hollow shaft convenience.
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Automation Systems: Precise low-speed torque for light-duty drives.
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Small Hoists & Lifters: Self-locking for secure positioning.
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Medical & Laboratory Devices: Low-vibration, clean performance in sensitive settings.
Why Choose the SCUA Series?
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Direct Hollow Shaft Output: Reduces the need for additional couplings or adapters.
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High Efficiency in Small Form Factor: Niemann profile ensures smooth torque transfer.
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Inherent Safety: Self-locking feature supports vertical or hold-position needs.
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Low Maintenance: Splash lubrication and easy-access service points simplify upkeep.
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Reliable Support: Fully backed by Melink Automation and MHI HASEG’s technical expertise.
For sizing assistance, drawings, and performance details, contact Melink Automation, your trusted distributor of the MHI HASEG Worm Gear Reducer SCUA Series.
MHI HASEG Worm Gear Reducer SCUA Series Size:125~250(Output Shaft Arrangement:Left)
| SCUA |
Gear Ratio: 315~1600 |
MHI HASEG Worm Gear Reducer SCUA Series Size |
| 125 |
160 |
200 |
225 |
250 |
| Output Shaft Arrangement:Left |
315 |
SCUA125LR-315 |
SCUA160LR-315 |
SCUA200LR-315 |
SCUA225LR-315 |
SCUA250LR-315 |
| 630 |
SCUA125LR-630 |
SCUA160LR-630 |
SCUA200LR-630 |
SCUA225LR-630 |
SCUA250LR-630 |
| 1000 |
SCUA125LR-1000 |
SCUA160LR-1000 |
SCUA200LR-1000 |
SCUA225LR-1000 |
SCUA250LR-1000 |
| 1250 |
SCUA125LR-1250 |
SCUA160LR-1250 |
SCUA200LR-1250 |
SCUA225LR-1250 |
SCUA250LR-1250 |
| 1600 |
SCUA125LR-1600 |
SCUA160LR-1600 |
SCUA200LR-1600 |
SCUA225LR-1600 |
SCUA250LR-1600 |
| SCUA |
Gear Ratio: 315~1600 |
MHI HASEG Worm Gear Reducer SCUA Series Size |
| 125 |
160 |
200 |
225 |
250 |
| Output Shaft Arrangement:Left |
315 |
SCUA125LL-315 |
SCUA160LL-315 |
SCUA200LL-315 |
SCUA225LL-315 |
SCUA250LL-315 |
| 630 |
SCUA125LL-630 |
SCUA160LL-630 |
SCUA200LL-630 |
SCUA225LL-630 |
SCUA250LL-630 |
| 1000 |
SCUA125LL-1000 |
SCUA160LL-1000 |
SCUA200LL-1000 |
SCUA225LL-1000 |
SCUA250LL-1000 |
| 1250 |
SCUA125LL-1250 |
SCUA160LL-1250 |
SCUA200LL-1250 |
SCUA225LL-1250 |
SCUA250LL-1250 |
| 1600 |
SCUA125LL-1600 |
SCUA160LL-1600 |
SCUA200LL-1600 |
SCUA225LL-1600 |
SCUA250LL-1600 |
MHI HASEG Worm Gear Reducer SCUA Series Size:125~250(Output Shaft Arrangement:Right)
| SCUA |
Gear Ratio: 315~1600 |
MHI HASEG Worm Gear Reducer SCUA Series Size |
| 125 |
160 |
200 |
225 |
250 |
| Output Shaft Arrangement:Right |
315 |
SCUA125RR-315 |
SCUA160RR-315 |
SCUA200RR-315 |
SCUA225RR-315 |
SCUA250RR-315 |
| 630 |
SCUA125RR-630 |
SCUA160RR-630 |
SCUA200RR-630 |
SCUA225RR-630 |
SCUA250RR-630 |
| 1000 |
SCUA125RR-1000 |
SCUA160RR-1000 |
SCUA200RR-1000 |
SCUA225RR-1000 |
SCUA250RR-1000 |
| 1250 |
SCUA125RR-1250 |
SCUA160RR-1250 |
SCUA200RR-1250 |
SCUA225RR-1250 |
SCUA250RR-1250 |
| 1600 |
SCUA125RR-1600 |
SCUA160RR-1600 |
SCUA200RR-1600 |
SCUA225RR-1600 |
SCUA250RR-1600 |
| SCUA |
Gear Ratio: 315~1600 |
MHI HASEG Worm Gear Reducer SCUA Series Size |
| 125 |
160 |
200 |
225 |
250 |
| Output Shaft Arrangement:Right |
315 |
SCUA125RL-315 |
SCUA160RL-315 |
SCUA200RL-315 |
SCUA225RL-315 |
SCUA250RL-315 |
| 630 |
SCUA125RL-630 |
SCUA160RL-630 |
SCUA200RL-630 |
SCUA225RL-630 |
SCUA250RL-630 |
| 1000 |
SCUA125RL-1000 |
SCUA160RL-1000 |
SCUA200RL-1000 |
SCUA225RL-1000 |
SCUA250RL-1000 |
| 1250 |
SCUA125RL-1250 |
SCUA160RL-1250 |
SCUA200RL-1250 |
SCUA225RL-1250 |
SCUA250RL-1250 |
| 1600 |
SCUA125RL-1600 |
SCUA160RL-1600 |
SCUA200RL-1600 |
SCUA225RL-1600 |
SCUA250RL-1600 |
MHI HASEG Worm Gear Reducer SCUA Series Size:280~400(Output Shaft Arrangement:Left)
| SCUA |
Gear Ratio: 315~1600 |
MHI HASEG Worm Gear Reducer SCUA Series Size |
| 280 |
320 |
360 |
400 |
| Output Shaft Arrangement:Left |
315 |
SCUA280LR-315 |
SCUA320LR-315 |
SCUA360LR-315 |
SCUA400LR-315 |
| 630 |
SCUA280LR-630 |
SCUA320LR-630 |
SCUA360LR-630 |
SCUA400LR-630 |
| 1000 |
SCUA280LR-1000 |
SCUA320LR-1000 |
SCUA360LR-1000 |
SCUA400LR-1000 |
| 1250 |
SCUA280LR-1250 |
SCUA320LR-1250 |
SCUA360LR-1250 |
SCUA400LR-1250 |
| 1600 |
SCUA280LR-1600 |
SCUA320LR-1600 |
SCUA360LR-1600 |
SCUA400LR-1600 |
| SCUA |
Gear Ratio: 315~1600 |
MHI HASEG Worm Gear Reducer SCUA Series Size |
| 280 |
320 |
360 |
400 |
| Output Shaft Arrangement:Left |
315 |
SCUA280LL-315 |
SCUA320LL-315 |
SCUA360LL-315 |
SCUA400LL-315 |
| 630 |
SCUA280LL-630 |
SCUA320LL-630 |
SCUA360LL-630 |
SCUA400LL-630 |
| 1000 |
SCUA280LL-1000 |
SCUA320LL-1000 |
SCUA360LL-1000 |
SCUA400LL-1000 |
| 1250 |
SCUA280LL-1250 |
SCUA320LL-1250 |
SCUA360LL-1250 |
SCUA400LL-1250 |
| 1600 |
SCUA280LL-1600 |
SCUA320LL-1600 |
SCUA360LL-1600 |
SCUA400LL-1600 |
MHI HASEG Worm Gear Reducer SCUA Series Size:280~400(Output Shaft Arrangement:Right)
| SCUA |
Gear Ratio: 315~1600 |
MHI HASEG Worm Gear Reducer SCUA Series Size |
| 280 |
320 |
360 |
400 |
| Output Shaft Arrangement:Right |
315 |
SCUA280RR-315 |
SCUA320RR-315 |
SCUA360RR-315 |
SCUA400RR-315 |
| 630 |
SCUA280RR-630 |
SCUA320RR-630 |
SCUA360RR-630 |
SCUA400RR-630 |
| 1000 |
SCUA280RR-1000 |
SCUA320RR-1000 |
SCUA360RR-1000 |
SCUA400RR-1000 |
| 1250 |
SCUA280RR-1250 |
SCUA320RR-1250 |
SCUA360RR-1250 |
SCUA400RR-1250 |
| 1600 |
SCUA280RR-1600 |
SCUA320RR-1600 |
SCUA360RR-1600 |
SCUA400RR-1600 |
| SCUA |
Gear Ratio: 315~1600 |
MHI HASEG Worm Gear Reducer SCUA Series Size |
| 280 |
320 |
360 |
400 |
| Output Shaft Arrangement:Right |
315 |
SCUA280RL-315 |
SCUA320RL-315 |
SCUA360RL-315 |
SCUA400RL-315 |
| 630 |
SCUA280RL-630 |
SCUA320RL-630 |
SCUA360RL-630 |
SCUA400RL-630 |
| 1000 |
SCUA280RL-1000 |
SCUA320RL-1000 |
SCUA360RL-1000 |
SCUA400RL-1000 |
| 1250 |
SCUA280RL-1250 |
SCUA320RL-1250 |
SCUA360RL-1250 |
SCUA400RL-1250 |
| 1600 |
SCUA280RL-1600 |
SCUA320RL-1600 |
SCUA360RL-1600 |
SCUA400RL-1600 |
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