Worm Gear Reducers
Built for Precision. Sized for Every Drive.
Precision-ground worm shafts. DIN 3974 Class 2. Six series from 0.06 kW aluminium units to 2,745 N·m cast-iron drives — engineered for reliability, documented with full torque and efficiency data. Ships to Korea, Japan, and 60+ countries.
Three Problems Every Drive Engineer Knows
Over-specifying costs budget. Under-specifying costs machines. Wrong environment rating costs downtime. Every series we make is designed to eliminate one of these failure modes.
Wrong Power-Frame Matching
A packaging line with 12 drives ranging from 0.06 kW label applicators to 7.5 kW film-seal stations shouldn't need two different gearbox families — or a custom bracket for every motor size.
Seal Failure in Wet Environments
Standard die-cast aluminium housings corrode and develop shaft seal leaks within months in slaughterhouse, car wash, and outdoor field equipment — contaminating product and triggering unplanned shutdowns.
Backlash Degrading Servo Precision
For robotic joints and solar tracking drives, uncertified backlash means the servo control loop has to compensate mechanically — widening position error, increasing gain, and reducing system stability.
Choose by Application, Not by Catalogue Number
Each series solves a different engineering problem. Use the filters to find the right fit — or browse all and compare specs directly.
RV / NMRV Series
Aluminium die-cast, IEC direct-mount. The industry standard for packaging, conveyor, and food machinery drives.
EP-NMRV with Output Flange
Direct flange output eliminates output coupling. Preferred by OEM machine builders for rotary indexing and filling heads.
XRV050 — Slaughter & Washdown
IP67 rated, SUS304 worm wheel hub, powder-coated ADC12. Designed for daily washdown in meat processing, car wash, and field equipment.
MRV050 — 0.06–7.5 kW
Upgraded from RV series. Extended power range with non-standard 12:1 and 52:1 ratios. Covers micro-motors to 7.5 kW sealing stations in one housing.
VRV030 — P15/P45/P70 Series
Grease-lubricated, 3,000 rpm max input. Three backlash classes (≤0.50° / ≤0.13° / ≤0.066°). Drop-in Ondrives & Rino P-series replacement.
WPWO — Up to 2,745 N·m
Full cast iron housing for sustained high-torque industrial drives. Noise below 50 dB(A). Used in metallurgy, mining, heavy conveying, and lifting equipment.
Which Series Is Right for Your Application?
A side-by-side reference engineers actually use — before calling for a quote.
| Series | Housing | Torque Range | Power Range | IP / Environment | Key Differentiator | Best For |
|---|---|---|---|---|---|---|
| RV / NMRV | ADC12 Aluminium | Up to ~120 N·m | 0.06–15 kW | IP55 | Self-locking ≥ 20:1, IEC/NEMA direct mount | Packaging, food, conveyor, general OEM |
| EP-NMRV Flange | ADC12 Aluminium | Up to ~120 N·m | 0.06–15 kW | IP55 + Viton | Direct flange output — no coupling needed | Rotary indexing, filling heads, OEM design |
| XRV050 IP67 | ADC12 + SUS304 Hub | Up to ~120 N·m | 0.06–7.5 kW | IP67 Washdown | Daily high-pressure wash, stainless hub, non-std ratios | Slaughter, car wash, field, aquaculture |
| MRV050 | ADC12 Aluminium | Up to ~120 N·m | 0.06–7.5 kW | IP55 | Extended power + 12:1 & 52:1 non-std ratios | Packaging OEM, multi-station machines |
| VRV030 (P15–P70) | One-piece Cast | Up to ~200 N·m | Servo / Stepper | Any orientation | 3 backlash classes, full efficiency & inertia data | Robotics, solar tracking, military, precision |
| WPWO / WPWDK | HT200 Cast Iron | 19–2,745 N·m | 0.12–33.2 kW | Standard | High torque, low noise <50 dB, universal mount | Metallurgy, mining, lifting, heavy conveying |
Where Our Worm Gear Reducers Are Running
Six sectors with different reducer requirements — each solved by a different configuration from our range.
Lifts & Elevators
Reliable torque transmission and self-locking at ratios ≥20:1 — holds load safely when power is off. Used in passenger lifts, goods hoists, and vertical platform drives.
Conveyor & Material Handling
Multi-station lines from 0.06 kW light belt conveyors to 33.2 kW heavy bulk handling. Compact footprint, quiet operation below 50 dB(A), IEC direct-mount.
Industrial Automation & Robotics
Robot joints, servo-driven indexing and precision positioning. Certified backlash classes (≤0.066° AR), published reflected inertia, grease lubrication for any axis orientation.
Agricultural Equipment
Feed augers, irrigation pivot drives, and harvester conveyors. Outdoor-rated, corrosion-resistant housings with self-locking at high ratios to hold position without a brake.
Mining & Heavy Equipment
Mine conveyor head drives, crushing plant feeders, and tunnel boring auxiliary equipment. Cast iron rigidity sustains high radial shaft loads under continuous heavy-duty cycles.
Winches & Hoists
Mooring winches, overhead crane hoists, and cable pulling systems. High reduction ratios (up to 60:1 single stage) with reliable static self-locking under suspended loads.
4-Step Reducer Selection Framework
Sending a quote request with incomplete data creates delays. Use this framework to define your requirements before contacting us — or use it to verify whether a catalogue series fits your application without an enquiry.
Torque (N·m) × SF (1.25–2.0 for shock load) = derated requirement
Motor speed ÷ required output rpm. Check non-standard ratios if standard steps don't fit.
Dry/IP55 → Standard aluminium | Washdown/IP67 → XRV050 | Heavy/continuous → Cast iron WP
Backlash budget → Standard / A / AR class. Check reflected inertia vs servo motor inertia ratio.
Manufacturing Depth That Shows Up in the Numbers
We don't source generic gearboxes and rebrand them. Every housing, worm shaft, and wheel in our range is produced under a controlled process with published verification data — efficiency curves, Fr2 load limits, and inertia tables included in every technical datasheet.
20CrMnTi Carburised Worm Shafts
Case-hardened to HRC 58–62, precision ground to DIN 3974, 0.3–0.5 mm retained case layer after final grind. Not milled. Ground.
ISO 9001:2015 with Pre-Dispatch Testing
Every unit tested for rotation under load and noise before shipment. Test records retained. Certificates available on request.
Engineering Data Published Per Ratio
Efficiency, Fr2 radial load, reflected inertia, and output torque are published for every ratio in every series — not a single number for the whole range.
OEM Customisation: Ratios, Flanges, Seals
Non-standard ratios (e.g. 12:1, 52:1), custom flange codes, NSK/SKF bearing brand specification, and shaft configurations available at production quantities.
"The reflected inertia data published per ratio is what convinced us. Very few compact worm gearbox suppliers at this price point provide this. Our servo tuning matched simulation closely on first commissioning."
Yoon Hyeong-jun — Automation Engineer, IncheonFrom Raw Material to Pre-Tested Unit
Every worm gear reducer passes 8 production stages with quality checkpoints at stages 3, 5, and 8 before shipment.
Incoming QC
Machining
Case Hardening
Shaft Grinding
Assembly QC
Fill & Seal
Load Test
& Dispatch
Retained case layer verified: 0.3–0.5 mm after finish grinding
Worm-to-wheel centre distance verified within tolerance class
Noise and smooth rotation under rated load, every unit
Engineers Who Specified and Used These Units
Real feedback from machine builders and engineers who have run Korea Ever-Power worm gear reducers in production environments.
"Needed 117 rpm output for a label applicator. The MRV050 at 12:1 solved it exactly — no inverter needed, motor size dropped from 0.37 kW to 0.25 kW. The parameter table made the selection straightforward."
"Replaced Ondrives P45-20A units on a handling robot wrist joint. Measured backlash: 0.11° — within A-class spec. Servo loop behaviour identical to original. 40% cost saving vs OEM part."
"Running 3 WPWO units on coil transfer table drives at ~800 N·m. Cast iron housings handle the adjacent rolling mill vibration perfectly. Oil temperature at 72°C steady-state — well under the 95°C limit."
Common Engineering Questions
Answers to the questions drive engineers ask most often before specifying a worm gear reducer series.
Need the matched worm wheel or worm shaft alongside your reducer?
