Description
EP-NMRV150 — Flagship Maximum-Torque Aluminium Worm Gearbox
The EP-NMRV150 is the crown jewel of Ever Power’s NMRV aluminium worm gearbox series. At a 150 mm centre distance with 15 kW maximum input power, it delivers an outstanding 16,508 N·m peak output torque at ratio 100 — 37% more than the NMRV130 and the highest output torque available in any NMRV aluminium worm gearbox. Yet despite this remarkable power density, the die-cast aluminium housing keeps the total unit weight at approximately 40 kg, roughly 55% lighter than an equivalent cast-iron reducer at this torque class. For industries that demand maximum torque in a compact, lightweight, corrosion-free package — from port bulk material handling and heavy crane systems to large chemical reactor agitator drives and primary sludge treatment facilities — the NMRV150 is the definitive solution. The extended IEC flange range, reaching 160B5, covers 11–15 kW three-phase motors and eliminates coupling shafts at the highest power level in the aluminium worm gearbox category. Combined with a 50 mm standard output bore, the NMRV150 provides the most robust shaft interface in the series for direct hollow-shaft mounting on driven sprockets, pulleys, and agitator shafts.
Technical Specifications — EP-NMRV150
| Parameter | Value |
|---|---|
| Series | NMRV (Bore Input with Input Flange) |
| Centre Distance | 150 mm |
| Reduction Ratios | 5, 7.5, 10, 15, 20, 25, 30, 40, 50, 60, 80, 100 |
| Rated Input Power | Up to 15 kW |
| Output Speed Range | 14 to 280 r/min (at 1400 r/min input) |
| Max Output Torque | 16,508 N·m |
| Housing Material | Die-cast aluminium alloy |
| Worm Wheel Material | Phosphor bronze |
| Worm Shaft Material | 20CrMnTi alloy steel, case hardened, precision ground |
| IEC Input Flanges | 100/112B5, 100/112B14, 132B5, 160B5 |
| Output Bore Diameter | 50 mm standard (H7 with keyway) |
| Lubrication | ISO VG 220 gear oil (factory filled) |
| Mounting Positions | B3, B6, B7, B8, V5, V6 |
| Protection Class | IP54 |
| Ambient Temperature | -10°C to +40°C |
NMRV150 Performance Table (15 kW / 1400 r/min)
| Ratio (i) | Output Speed (r/min) | Output Torque (N·m) | Radial Load (N) | Service Factor (fs) |
|---|---|---|---|---|
| 7.5 | 187 | 6,962 | — | 1.7 |
| 10 | 140 | 7,663 | — | 1.3 |
| 15 | 93 | 8,771 | — | 0.9 |
| 20 | 70 | 9,654 | 1291 | 1.0 |
| 25 | 56 | 10,400 | 1576 | 0.8 |
| 30 | 47 | 11,051 | 934 | 1.3 |
| 40 | 35 | 12,163 | 1171 | 1.3 |
| 50 | 28 | 13,103 | 1426 | 1.0 |
| 60 | 23 | 13,924 | 1643 | 0.8 |
| 80 | 18 | 15,325 | — | 1.0 |
| 100 | 14 | 16,508 | — | 0.8 |
✅ Flagship Features of the NMRV150
📈 16,508 N·m — Series Maximum
The NMRV150 sets the peak output torque for the NMRV aluminium worm gearbox series at 16,508 N·m, enabling single-stage worm reduction on drives previously requiring multi-stage or parallel-shaft gearboxes.
🕵 IEC 160B5 — 15 kW Direct Flange
The 160B5 flange option covers 11–15 kW IEC 160 motors without an intermediate coupling, making the NMRV150 the only standard aluminium worm gearbox that can directly accept a 15 kW motor.
◯ 50 mm Output Bore — Maximum Interface
The 50 mm H7 hollow output bore is the largest in the NMRV series, providing maximum contact area for hollow-shaft mounting and eliminating fretting fatigue on high-torque, cyclic load applications.
⛁ ~40 kg at 16,508 N·m
The NMRV150 achieves 16,508 N·m in approximately 40 kg — a torque-to-weight ratio that no cast-iron worm reducer at this torque class can match. The resulting weight saving simplifies installation logistics on elevated conveyor frames and offshore platforms.
🌞 Synthetic-Lubricant-Ready Design
At 15 kW continuous, the NMRV150’s internal operating temperature justifies the use of synthetic ISO VG 220 lubricant as standard, providing superior film strength, wider temperature range, and oil change intervals of 8,000–10,000 hours.
🏭 Application Sectors for the NMRV150
🚢 Port & Bulk Material Handling
Maximum-torque worm gear reducer for port grain unloader conveyor head-end drives, ship-loader boom conveyors, and dry-bulk terminal stacker-reclaimer slewing drives requiring 12,000–16,500 N·m.
🏹 Heavy Crane & Hoist Systems
Aluminium worm gearbox for gantry crane hoist drum drives, ship-deck crane luffing mechanisms, and industrial hoist winch drives at 14–25 r/min output speed.
📥 Large Chemical & Petrochemical Reactors
High-torque worm gearmotor for large polymer reactor agitators, bitumen blending vessels, and chemical kneading machines requiring 15 kW input at ratio 80–100.
💧 Primary Sludge Treatment
Worm gear reduction gearbox for large-diameter primary clarifier rakes, anaerobic digester top-entry mixers, and thickener drives in major metropolitan water treatment plants.
🔎 NMRV150 Selection & Shaft Dimensions
Design Example — Port Conveyor Head-End Drive
Required: 15 kW motor at 1400 r/min driving a bulk conveyor pulley at 14 r/min (i=100). Output torque from table = 16,508 N·m. For Class B medium-shock conveyor load, fs=1.3: demand = 16,508/1.3 = 12,699 N·m — within rating. ✅ NMRV150-100-160B5 selected.
NMRV150 DZ/SZ Output Shaft Dimensions
| G1 (mm) | K1 (mm) | L/DZ (mm) | L1/SZ (mm) | b2 (mm) | d h6 (mm) | Keyway |
|---|---|---|---|---|---|---|
| 200 | 187 | 297 | 374 | 14 | 50 | M16 |
⚖ NMRV150 vs Cast-Iron Maximum-Torque Reducers
| Feature | EP-NMRV150 | Cast-Iron Equivalent |
|---|---|---|
| Approximate Weight | ~40 kg | ~90 kg |
| Max Output Torque | 16,508 N·m | Similar at 2.25x weight |
| IEC Flange Range | 100/112B5 to 160B5 | Typically 2 sizes |
| Corrosion Resistance | Aluminium oxide — 10+ yr outdoor | Annual repainting required |
| Thermal Conductivity | 237 W/m·K | 52 W/m·K |
| Max Input Power | 15 kW | 15 kW at double the weight |
❓ FAQs — EP-NMRV150
How does the NMRV150 compare to the NMRV130?
The NMRV150 raises centre distance from 130 to 150 mm, increasing max output torque by 37% (16,508 vs 12,076 N·m) and input power from 11 to 15 kW. The output bore grows from 45 to 50 mm and IEC flange support extends to 160B5 for 15 kW motors.
What IEC motor frame is compatible with the 160B5 input flange?
The 160B5 flange accepts IEC 160 frame motors rated 11–15 kW at 1400 r/min. The IEC 160 motor output shaft is 42 mm diameter. The NMRV150 bore for 160B5 accommodates this directly. Provide the motor shaft diameter and key details when placing an order to confirm compatibility.
Is the NMRV150 suitable for 24-hour continuous operation?
Yes, at the published rated torque and power with ISO VG 220 synthetic lubricant, the NMRV150 supports continuous 24-hour duty. At ambient temperatures above 35°C, ensure housing fins are unobstructed and consider a 0.5 m/s directed airflow over the casing to maintain oil temperature below 80°C.
What is the maximum radial load on the NMRV150 output shaft?
At ratio 20, the maximum radial load is 1,576 N at the shaft centre. At ratio 25 it is also 1,576 N. At ratio 100, radial load data is not specified (dashes in table) because at this ratio the output speed is so low that overhung loads must be individually assessed by our engineering team for each specific application.
Can the NMRV150 be fitted with a hollow output shaft for direct driven-equipment mounting?
Yes. The standard NMRV150 already features a 50 mm H7 hollow output bore for shaft-mount applications. For the DZ or SZ solid shaft option, the output shaft is 50 mm h6 with an M16 key. Output flanges (F) and hollow output flanges (FL) are also available for face-mount configurations.
⭐ Customer Reviews
★★★★★
“The NMRV150 drives the head-end pulley on our new grain export conveyor at the port. At ratio 100 with a 15 kW motor, the output torque and speed are exactly right for our 1,200 t/hr throughput. The compact unit weight simplified structural design enormously compared to our previous cast-iron drive.”
Cameron H. — Project Engineer, Grain Export Terminal 🇦🇺 Australia (Western Australia)
★★★★★
“We use two NMRV150 units on our large bitumen blending reactor agitator drives. At ratio 80 with 15 kW motors the start-up torque on cold bitumen is very high, but the NMRV150 handles it without complaint. Oil temperature stays well below 80°C throughout the blending cycle.”
Ibrahim A. — Plant Manager, Bitumen Processing 🇪🇬 Egypt
★★★★☆
“Installed six NMRV150 units on our municipal clarifier primary rake mechanisms. The aluminium housing handles the hydrogen-sulphide atmosphere in the clarifier building far better than cast-iron units we used previously, which required repainting every 18 months.”
Anika S. — Water Infrastructure Manager, City Municipality 🇩🇪 Germany
⚙ Accessories & Compatible Products
⚡ IEC Motors (B5/B14)
Standard single-phase and three-phase AC motors with matching IEC flange. VFD inverter-duty versions available.
🔗 Output Shaft Kits
Single solid (DZ), double-ended (SZ), output flange (F), hollow flange (FL) — all H7/h6 tolerance with standard keyways.
🔨 Torque Arms
Steel torque reaction arms for shaft-mount configurations; foot-mounting plates for B3/B6 orientations.
🔒 Seal & Breather Kits
Replacement lip-seal kits, vented breather plugs, and magnetic drain plugs for service intervals.
Enquire About EP-NMRV150 — Maximum-Torque Aluminium Worm Gearbox
The NMRV150 is our highest-torque standard aluminium worm gearbox. Our engineering team is ready to confirm the exact configuration, discuss custom options, and provide OEM or project pricing.
The EP-NMRV150 is the flagship aluminium worm gear reducer in Ever Power’s NMRV series, featuring a 150 mm centre distance, ratios from 5 to 100, rated input power up to 15 kW, and a maximum output torque of 16,508 N·m. IEC flanges 100/112B5 through 160B5 are directly compatible. This maximum-torque worm gearbox handles the highest-demand industrial drives — heavy crane hoists, large mixing reactors, port conveyor head-end drives, and primary sludge processing — in a die-cast aluminium housing weighing just ~40 kg.
