GBC-NMRV Aluminum Worm Gearbox — Flange Input Worm Gear Reducer with Output Flange
The GBC-NMRV Aluminum Worm Gearbox is a lightweight, high-efficiency flange-input worm gear reducer featuring a die-cast aluminum alloy housing for superior heat dissipation and corrosion resistance. Available in nine frame sizes (NMRV030–NMRV150) with gear ratios from 7.5:1 to 100:1 and input power from 0.06 kW to 15 kW, this gearbox mounts directly to IEC-standard AC, DC, and servo motors for plug-and-play integration. Its self-locking worm drive eliminates external braking devices, while Viton oil seals ensure leak-free, high-temperature operation. ISO 9001:2015 certified with CE and SGS approvals. Ideal for food processing machinery, automated packaging lines, conveyor systems, and industrial automation. Contact us today for competitive pricing and fast worldwide delivery.
The GBC-NMRV aluminum worm gearbox is a lightweight, high-performance worm reducer built around a precision-machined worm and tin-bronze worm gear set. Featuring an advanced square-box aluminum alloy housing, the GBC-NMRV delivers an outstanding strength-to-weight ratio, rapid heat dissipation, and a clean, modern appearance that integrates seamlessly into today's compact machine designs. Available in nine frame sizes from NMRV030 to NMRV150, with gear ratios spanning 7.5:1 to 100:1 and input power from 0.06 kW to 15 kW, this series covers everything from micro-motion actuators to heavy-duty conveyor drives.
What sets the GBC-NMRV apart is its flange-input design — an IEC-normalised motor mounting flange allows direct coupling to AC motors, DC motors, servo motors, and brake motors without the need for an external coupling or adapter bracket. This plug-and-play integration saves installation time, reduces alignment errors, and produces a more compact overall drive package. The gearbox is also available with solid shaft input and worm shaft tail extension input for non-motor-driven applications.
Every GBC-NMRV unit is manufactured under strict ISO 9001:2015 quality control, with Viton oil seals for superior high-temperature resistance and minimal leakage, and premium bearings from trusted brands. With a production capacity exceeding 15,000 units per month, we provide reliable supply for OEM manufacturers, system integrators, and distributors worldwide. Contact us for a free engineering consultation and competitive quotation.

Technical Specifications
| Parameter | Details |
|---|---|
| Product Name | GBC-NMRV Aluminum Worm Gearbox / Worm Gear Reducer with Output Flange |
| Available Models | GBC-NMRV030, GBC-NMRV040, GBC-NMRV050, GBC-NMRV063, GBC-NMRV075, GBC-NMRV090, GBC-NMRV110, GBC-NMRV130, GBC-NMRV150 |
| Input Configurations | IEC-normalised Motor Flange · Solid Shaft Input · Worm Shaft Tail Extension · Direct Motor Coupling (AC / DC / Servo) |
| Output Configurations | Keyed Hollow Shaft · Hollow Shaft with Output Flange · Plug-in Solid Shaft |
| Gear Ratio Range | 7.5 : 1, 10, 15, 20, 25, 30, 40, 50, 60, 80, 100 |
| Input Power | 0.06 kW – 15 kW (higher ratings available on request) |
| Housing Material | Die-cast aluminum alloy |
| Worm Gear Material | Tin bronze (ZCuSn10Pb1) |
| Worm Shaft Material | 20CrMnTi — carburized & quenched |
| Output Shaft Material | Chromium steel 45# |
| Bearings | C&U / QC / HRB (custom brand available) |
| Seals | SKF / NAK / KSK — Viton oil seal for high-temperature resistance & anti-oxidation |
| Lubricant | Synthetic or mineral oil |
| IEC Motor Flanges | 56B14, 63B14, 63B5, 71B14, 80B14, etc. |
| Protection Rating | IP55 |
| Color Options | Blue / Black / Grey (custom color on request) |
| Certifications | ISO 9001:2015 · CE · SGS |
| Warranty | 1 year |
| Packing | Carton / Wooden pallet / Wooden case |
| Production Capacity | 15,000 units / month |
GBC-NMRV Worm Gearbox Structure Drawing

Features & Benefits
✅ Lightweight Aluminum Alloy Housing
Up to 50% lighter than cast-iron alternatives, reducing structural load on your machine frame while delivering superior heat dissipation through the high thermal conductivity of aluminum.
✅ IEC Flange Motor Mounting — Plug & Play
Direct bolt-on connection to IEC-standard motors eliminates the need for couplings, motor brackets, or alignment procedures — cutting installation time and reducing potential vibration sources.
✅ Self-Locking Worm Drive
At higher reduction ratios, the worm mechanism prevents back-driving of the output shaft, eliminating the need for external braking devices and reducing overall system cost.
✅ Low Noise & Smooth Transmission
The tin-bronze gear meshing with the hardened steel worm produces exceptionally quiet operation, ideal for noise-sensitive environments such as food halls, laboratories, and packaging facilities.
✅ Viton Oil Seals
Premium Viton seals resist high temperatures up to 200 °C and provide excellent anti-oxidation properties, virtually eliminating oil leakage and extending maintenance intervals.
✅ Compact Square-Box Design
The square housing enables universal mounting in any orientation — foot, flange, or torque arm — and maximises space efficiency inside crowded machine enclosures.
✅ Flexible Output Options
Choose from keyed hollow shaft, output flange, single solid shaft, or double output shaft to match your driven equipment without costly mechanical adapters.
✅ Hardened 20CrMnTi Worm Shaft
Carburized and quenched alloy steel ensures high surface hardness, superior wear resistance, and consistent performance over millions of operating cycles.

Applications — Where GBC-NMRV Worm Gearboxes Excel
The GBC-NMRV flange-input worm gear reducer is trusted across dozens of industries. Its lightweight aluminum housing, plug-and-play motor mounting, and wide ratio range make it a versatile building block for virtually any power transmission system requiring speed reduction and torque multiplication.
🏭
Food & Beverage Processing
Conveyor belt systems, mixing machines, bottling lines, and bakery equipment where lightweight construction and hygienic operation are essential.
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Printing & Packaging Machinery
Label applicators, carton erectors, shrink wrappers, and automated packaging lines requiring precise speed control and rapid stop functionality.
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Industrial Automation & Robotics
Robotic arm joints, rotary indexing tables, pick-and-place units, and CNC auxiliary drives where compact size and backlash control matter.
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Environmental Engineering
Wastewater treatment aerators, sludge scrapers, dredgers, and pollution control equipment exposed to moisture and chemicals.
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Textile Equipment
Spinning frames, looms, dyeing machines, and fabric winding systems where smooth, vibration-free power delivery protects delicate materials.
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Electrical & Transport Equipment
Gate operators, rolling shutters, material handling trolleys, and small lifting devices where the aluminum housing's light weight reduces total system mass.
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Warehousing & Logistics
Automated storage and retrieval systems (AS/RS), sorting machines, and small conveyors in distribution centres.
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General Industrial Machinery
Agitators, mixers, ceramic kilns, tobacco equipment, and any application requiring a reliable, cost-effective speed reduction solution.

GBC-NMRV Model Parameters
| Model | Rated Power | Rated Ratio | Input Hole Dia. | Input Shaft Dia. | Output Hole Dia. | Output Shaft Dia. |
|---|---|---|---|---|---|---|
| GBC-NMRV030 | 0.06 – 0.25 kW | 7.5 – 80 | Φ9 (Φ11) | Φ9 | Φ14 | Φ14 |
| GBC-NMRV040 | 0.09 – 0.55 kW | 7.5 – 100 | Φ9 (Φ11, Φ14) | Φ11 | Φ18 (Φ19) | Φ18 |
| GBC-NMRV050 | 0.12 – 1.5 kW | 7.5 – 100 | Φ11 (Φ14, Φ19) | Φ14 | Φ25 (Φ24) | Φ25 |
| GBC-NMRV063 | 0.18 – 2.2 kW | 7.5 – 100 | Φ14 (Φ19, Φ24) | Φ19 | Φ25 (Φ28) | Φ25 |
| GBC-NMRV075 | 0.25 – 4.0 kW | 7.5 – 100 | Φ14 (Φ19, Φ24, Φ28) | Φ24 | Φ28 (Φ35) | Φ28 |
| GBC-NMRV090 | 0.37 – 4.0 kW | 7.5 – 100 | Φ19 (Φ24, Φ28) | Φ24 | Φ35 (Φ38) | Φ35 |
| GBC-NMRV110 | 0.55 – 7.5 kW | 7.5 – 100 | Φ19 (Φ24, Φ28, Φ38) | Φ28 | Φ42 | Φ42 |
| GBC-NMRV130 | 0.75 – 7.5 kW | 7.5 – 100 | Φ24 (Φ28, Φ38) | Φ30 | Φ45 | Φ45 |
| GBC-NMRV150 | 2.2 – 15 kW | 7.5 – 100 | Φ28 (Φ38, Φ42) | Φ35 | Φ50 | Φ50 |
Dimensional Drawings & Mounting Positions
Below you will find the outline installation dimensions, mounting position diagrams, output flange dimensions, and torque arm details for the GBC-NMRV aluminum worm gearbox series.
Outline Installation Dimensions

| Model | A (mm) | B (mm) | C (mm) | H (mm) | H1 (mm) | L (mm) | L1 (mm) | Weight (kg) |
|---|---|---|---|---|---|---|---|---|
| GBC-NMRV030 | 80 | 70 | 57 | 30 | 63 | 84 | 62 | 1.5 |
| GBC-NMRV040 | 97 | 80 | 71 | 40 | 78 | 103 | 78 | 2.5 |
| GBC-NMRV050 | 120 | 100 | 86 | 50 | 97 | 126 | 97 | 4.5 |
| GBC-NMRV063 | 144 | 121 | 103 | 63 | 116 | 145 | 112 | 7.5 |
| GBC-NMRV075 | 172 | 140 | 120 | 75 | 137 | 168 | 137 | 11 |
| GBC-NMRV090 | 205 | 165 | 145 | 90 | 160 | 197 | 160 | 18 |
| GBC-NMRV110 | 255 | 195 | 175 | 110 | 195 | 250 | 195 | 34 |
| GBC-NMRV130 | 293 | 230 | 200 | 130 | 220 | 270 | 220 | 50 |
| GBC-NMRV150 | 340 | 260 | 235 | 150 | 255 | 305 | 255 | 75 |
Mounting Positions

Output Flange Mounting Dimensions

| Model | DF (mm) | D0 (mm) | PCD (mm) | b3 (mm) | n × d |
|---|---|---|---|---|---|
| GBC-NMRV030 | 62 | 40 | 50 | 6 | 4 × Φ5.5 |
| GBC-NMRV040 | 80 | 50 | 65 | 7 | 4 × Φ6.5 |
| GBC-NMRV050 | 100 | 70 | 85 | 7.5 | 4 × Φ6.5 |
| GBC-NMRV063 | 120 | 80 | 100 | 8 | 4 × Φ8.5 |
| GBC-NMRV075 | 140 | 100 | 120 | 9 | 8 × Φ8.5 |
| GBC-NMRV090 | 160 | 110 | 140 | 10 | 8 × Φ8.5 |
| GBC-NMRV110 | 200 | 145 | 175 | 12 | 8 × Φ10.5 |
| GBC-NMRV130 | 250 | 175 | 215 | 14 | 8 × Φ12.5 |
| GBC-NMRV150 | 280 | 200 | 250 | 16 | 8 × Φ12.5 |
DF = Flange outer diameter · D0 = Pilot spigot diameter · PCD = Bolt circle diameter · b3 = Flange thickness · n × d = Number & diameter of bolt holes
Torque Arm Dimensions

| Model | LA (mm) | LB (mm) | d (mm) |
|---|---|---|---|
| GBC-NMRV030 | 92 | 60 | 8 |
| GBC-NMRV040 | 108 | 72 | 8 |
| GBC-NMRV050 | 135 | 95 | 10 |
| GBC-NMRV063 | 160 | 110 | 10 |
| GBC-NMRV075 | 185 | 130 | 12 |
| GBC-NMRV090 | 215 | 155 | 12 |
| GBC-NMRV110 | 270 | 200 | 14 |
| GBC-NMRV130 | 310 | 230 | 16 |
| GBC-NMRV150 | 360 | 270 | 20 |
LA = Torque arm total length · LB = Mounting bolt centre distance · d = Bolt diameter
📄 Need a CAD file? Contact our engineering team for 2D DXF or 3D STEP files for any GBC-NMRV model.
Selection Guide — How to Choose the Right GBC-NMRV Model
Selecting the correct worm gearbox requires matching your application's torque, speed, and mounting requirements to the right frame size and gear ratio. Follow the steps below or contact our engineers for a free personalised recommendation.
Step 1 — Determine Your Required Output Torque
Calculate the torque your driven equipment needs at the output shaft. Include a service factor (typically 1.0–2.0) based on duty cycle — continuous, intermittent, or shock-loaded.
Step 2 — Select the Gear Ratio
Divide the motor speed by your desired output speed to get the required ratio. GBC-NMRV gearboxes are available in ratios from 7.5:1 to 100:1. For ratios exceeding 100:1, consider a double-stage combination such as NMRV + NMRV or NMRV + NRV.
Step 3 — Match the IEC Motor Flange
Verify that your motor's IEC flange code (e.g. 56B14, 71B14, 80B5) matches one of the available input flanges for your chosen GBC-NMRV frame size. Refer to the parameter table above for input hole diameters.
Step 4 — Choose Your Output Configuration
Determine whether your machine requires a keyed hollow shaft, an output flange, a single solid shaft, or a double output shaft. Each option is available across all frame sizes.
Step 5 — Consider Combination Options
GBC-NMRV gearboxes can be combined in various arrangements for higher ratios or special configurations: NMRV + NMRV double stage, NMRV + NRV, NMRV + PC pre-stage, NMRV + UDL variator, or direct NMRV + motor assembly.
GBC-NMRV Model Number Decoder
| Code | Meaning |
|---|---|
| GBC-NMRV | Worm geared motor (flange input) |
| GBC-NRV | Worm reduction unit (shaft input) |
| 063 | Centre distance (mm) |
| 30 | Reduction ratio |
| VS | Double input shaft |
| F1 / FA | Output flange |
| AS | Single output shaft |
| AB | Double output shaft |
| PAM / 80B5 | Motor coupling / Motor mounting facility |
| 0.75KW | Electric motor power |
| B3 | Mounting position |
Example: GBC-NMRV-063-30-VS-F1-AS-80B5-0.75KW-B3 = Flange-input worm geared motor, 63 mm centre distance, 30:1 ratio, double input shaft, output flange + single solid shaft, 80B5 motor mount, 0.75 kW motor, B3 foot-mounted position.
Frequently Asked Questions
What is the difference between GBC-NMRV and GBC-NRV worm gearboxes?
GBC-NMRV models feature an IEC-standard flange input designed for direct motor mounting — simply bolt your motor onto the gearbox. GBC-NRV models use a solid shaft input for coupling to motors or driven equipment via couplings, belts, or chains. Internally, the worm gear mechanism, materials, and output options are identical.
What is the minimum order quantity (MOQ)?
There is no strict MOQ — we accept orders starting from a single unit for sample and evaluation purposes. Unit pricing improves significantly at quantities of 10, 50, 100, and 500+ pieces. Contact our sales team for a tiered price quotation tailored to your volume.
Can you customise the gearbox (special ratios, colours, shaft lengths, flanges)?
Yes. We routinely supply customised versions with non-standard shaft dimensions, special output flanges, custom paint colours, double input shafts, and unique ratio configurations. For custom orders, typical lead time is 15–25 working days depending on complexity. Send your technical drawing and we will confirm feasibility within 12 hours.
What is the typical lead time and shipping method?
Standard models are normally in stock and ship within 3–7 working days. Custom or large-volume orders typically require 15–25 working days. We can arrange sea freight, air freight, or express courier (DHL, FedEx, UPS) based on urgency and destination.
What warranty do you provide?
Every GBC-NMRV gearbox is backed by a 1-year warranty covering material and manufacturing defects under normal operating conditions. If a unit arrives damaged or develops a fault within the warranty period, we will either ship a replacement or provide a refund.
Why choose aluminum housing over cast iron?
Aluminum alloy housing is significantly lighter (up to 50% weight reduction), provides faster heat dissipation due to higher thermal conductivity, and offers natural corrosion resistance. It is ideal for applications where total system weight matters — such as robotic arms, mobile equipment, and overhead-mounted drives. For extremely heavy-duty or high-shock applications, our cast-iron GBC-NRV series may be more appropriate.
Can the GBC-NMRV gearbox be mounted in any orientation?
Yes. The GBC-NMRV supports universal mounting positions including B3 (foot), B5/B14 (flange), B6, B7, B8, V5, and V6. Different positions may require adjustments to oil fill level and breather plug location. Refer to the mounting position diagram above or contact us for guidance.
What Our Customers Say
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"We switched from a European brand to GBC-NMRV063 units on 24 packaging lines. The aluminum housing cut the gearbox weight by nearly half, which made a real difference on our overhead-mounted applications. After 18 months of continuous operation, zero failures. Excellent value."
— Stefan M., Plant Engineer
Packaging Equipment OEM · Germany
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"The IEC flange input was a perfect drop-in replacement for our existing motor-gearbox setup. No adapter brackets, no alignment hassle. We ordered 100 GBC-NMRV050 units and they arrived in 12 days — faster than our domestic supplier. Very impressed with the Viton seals — no leaks at all."
— Rachel W., Procurement Lead
Conveyor Systems Integrator · Australia
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"We needed custom double-output-shaft NMRV090 gearboxes for a textile tensioning application. The engineering team responded the same day and delivered working samples in three weeks. Communication and quality have been consistently excellent over two years of partnership."
— Raj P., Mechanical Design Manager
Textile Machinery Manufacturer · India
Related & Complementary Products
⚙️ GBC-NRV Shaft Input Worm Gearbox
The shaft-input counterpart to the NMRV series — ideal for belt, chain, or coupling-driven applications where a direct motor flange is not required.
🔄 UDL Series Mechanical Speed Variator
Stepless variable speed drive that pairs seamlessly with NMRV/NRV gearboxes for infinitely adjustable output speed without electronics.
⚡ Three-Phase AC Induction Motors
IEC-standard electric motors from 0.06 kW to 15 kW, available for direct flange mounting with GBC-NMRV gearboxes.
Ready to Get Started?
Get a Competitive Quotation in Under 12 Hours
Whether you need a single sample, a bulk OEM order, or a fully customised aluminum worm gearbox solution — our engineering and sales teams are ready to help. Tell us your application requirements and we will recommend the best GBC-NMRV model, ratio, and configuration for your project.
Warranty: 1 year | Shipping: Worldwide
The GBC-NMRV Aluminum Worm Gearbox is a lightweight, high-efficiency flange-input worm gear reducer featuring a die-cast aluminum alloy housing for superior heat dissipation and corrosion resistance. Available in nine frame sizes (NMRV030–NMRV150) with gear ratios from 7.5:1 to 100:1 and input power from 0.06 kW to 15 kW, this gearbox mounts directly to IEC-standard AC, DC, and servo motors for plug-and-play integration. Its self-locking worm drive eliminates external braking devices, while Viton oil seals ensure leak-free, high-temperature operation. ISO 9001:2015 certified with CE and SGS approvals. Ideal for food processing machinery, automated packaging lines, conveyor systems, and industrial automation. Contact us today for competitive pricing and fast worldwide delivery.






