PC + GBC-NMRV Worm Gearbox with Pre-stage Helical Gear Unit
The PC + GBC-NMRV is a compact two-stage speed reducer combining a helical pre-stage gear unit (PC) with a GBC-NMRV worm gearbox to achieve ultra-high reduction ratios up to 5,000:1. The helical pre-stage delivers over 90% transmission efficiency — significantly higher than a double worm arrangement — while the NMRV worm stage provides self-locking capability and right-angle output. Available in multiple PC + NMRV combination sizes with aluminum alloy housing, IEC motor flange compatibility, and universal mounting positions. Ideal for packaging machinery, textile equipment, food processing, electronic equipment, and any application requiring very low output speed with high torque. ISO 9001:2015 certified. Contact us for model selection and pricing.
The PC + GBC-NMRV is a compact, two-stage speed reducer that combines a helical pre-stage gear unit (PC) with a GBC-NMRV worm reducer to achieve exceptionally high reduction ratios in a single, integrated package. By adding the helical pre-stage, the combined unit delivers ratios far beyond the 100:1 limit of a single worm stage — reaching up to 5,000:1 — while maintaining high transmission efficiency averaging above 90% at the helical stage.
The PC pre-stage features rolling gear engagement for high efficiency and long service life, while the NMRV worm stage provides self-locking capability, right-angle output, and quiet operation. The aluminum alloy square-box housing keeps the total weight low with excellent heat dissipation, and the inline input/output configuration of the PC unit enables direct motor mounting via IEC flange or round flange interfaces.
Manufactured under ISO 9001:2015 quality control, the PC + GBC-NMRV is ideal for applications requiring very low output speeds with high torque in a compact footprint. Contact us for model selection assistance and competitive pricing.
Technical Specifications
| Parameter | Details |
|---|---|
| Product Name | PC + GBC-NMRV Worm Gearbox with Pre-stage Helical Gear Unit |
| Pre-stage Models | PC063, PC071, PC080, PC090, PC100 |
| NMRV Stage Models | GBC-NMRV040, 050, 063, 075, 090, 110 |
| Available Combinations | PC063 + NMRV040/050 · PC071 + NMRV050/063 · PC080 + NMRV063/075 · PC090 + NMRV075/090 · PC100 + NMRV090/110 |
| Combined Ratio Range | Up to 5,000:1 |
| Single Worm Stage Ratio | 7.5 – 100 |
| PC Pre-stage Efficiency | ≥ 90% |
| Housing Material | Die-cast aluminum alloy |
| Worm Gear Material | Tin bronze — high hardness, high wear resistance |
| Worm Shaft Material | 20CrMnTi — carburized & quenched |
| Input Configuration | IEC motor flange / Round flange / Solid shaft |
| Output Configuration | Keyed Hollow Shaft · Output Flange · Solid Shaft |
| Color Options | Blue / Silver (custom color on request) |
| Certifications | ISO 9001:2015 · CE · SGS |
| Warranty | 12 months |
| Packing | Carton / Wooden pallet / Wooden case |
| Production Capacity | 15,000 units / month |
Parts Structure
Features & Benefits
✅ Ultra-High Ratios up to 5,000:1
The helical pre-stage multiplies the worm stage ratio, achieving output speeds as low as 0.3 RPM from a standard 1,400 RPM motor — impossible with a single-stage worm gearbox.
✅ High Pre-stage Efficiency ≥ 90%
Rolling helical gear engagement in the PC unit delivers far higher efficiency than a second worm stage, reducing heat generation and energy waste in the first reduction step.
✅ Compact Two-in-One Design
Integrated PC + NMRV assembly occupies less space and requires fewer mounting brackets than two separate gearboxes connected via coupling.
✅ Lightweight Aluminum Housing
Die-cast aluminum alloy construction keeps total weight low with excellent natural heat dissipation through the housing surface.
✅ High Wear Resistance
Tin-bronze worm gear with high hardness provides exceptional wear resistance for demanding continuous-duty applications.
✅ Self-Locking Worm Stage
At higher worm ratios, the output cannot be back-driven — providing inherent holding capability without external brakes.
✅ Flexible Motor Mounting
Square flange and round flange options accommodate all standard IEC motors, servo motors, and DC motors.
✅ Universal Mounting Positions
Supports B3, B5, B6, B7, B8, V5, and V6 orientations for maximum installation flexibility.
Installation Environment
Operating Temperature: -10 °C to +40 °C (non-freezing)
Humidity: ≤ 85% (no condensation)
Environment: No explosive or corrosive gases · No direct sunlight · Minimal dust and metal particles · No continuous vibration or excessive impact · Minimal electromagnetic interference
Indoor installation recommended. For outdoor use, please add a ventilation cover and contact us for environmental protection options.
Applications
The PC + GBC-NMRV combined worm gear reducer is widely used in applications requiring very high reduction ratios with compact dimensions.
📦
Packaging & Carton Machinery
Ultra-low-speed feed rollers, glue applicators, and timing mechanisms in automated packaging lines.
🤖
Automated & Electronic Equipment
Precision positioning actuators, environmental test chambers, and semiconductor handling equipment.
👕
Textile & Leather Machinery
Slow-speed fabric tensioners, leather pressing rollers, and embossing machines.
🏭
Food & Pharmaceutical Machinery
Slow mixers, tablet presses, and filling machines requiring precise low-speed torque control.
⚙️
Woodworking & Glass Processing
CNC router feed drives, glass cutting tables, and edge-banding machines.
⚡
Plastics & Injection Moulding
Mould opening/closing mechanisms, extruder auxiliary drives, and peripheral equipment.
⚛
Environmental & Testing Equipment
Climate chambers, filtration systems, and water treatment dosing pumps.
🏫
Advertising & LED Equipment
Rotating displays, LED screen positioning, and sign mechanisms.
Mounting Positions
Dimensions & Selection Tables
The following dimensional drawings cover the main PC + GBC-NMRV combination sizes. Each drawing includes all critical mounting dimensions, shaft diameters, and bolt-hole patterns.
| Combination | PC Model | NMRV Model | Combined Ratio Range | Max Input Power (kW) | Output Bore (mm) | Approx. Weight (kg) |
|---|---|---|---|---|---|---|
| PC063 + GBC-NMRV040 | PC063 | GBC-NMRV040 | 56 – 4,000 | 0.55 | 18 | 4.5 |
| PC063 + GBC-NMRV050 | PC063 | GBC-NMRV050 | 56 – 5,000 | 1.1 | 25 | 6.5 |
| PC071 + GBC-NMRV050 | PC071 | GBC-NMRV050 | 56 – 5,000 | 1.5 | 25 | 7.5 |
| PC071 + GBC-NMRV063 | PC071 | GBC-NMRV063 | 56 – 5,000 | 2.2 | 25 | 10 |
| PC080 + GBC-NMRV063 | PC080 | GBC-NMRV063 | 56 – 5,000 | 2.2 | 25 | 12 |
| PC080 + GBC-NMRV075 | PC080 | GBC-NMRV075 | 56 – 5,000 | 4.0 | 28 | 16 |
| PC090 + GBC-NMRV075 | PC090 | GBC-NMRV075 | 56 – 5,000 | 4.0 | 28 | 19 |
| PC090 + GBC-NMRV090 | PC090 | GBC-NMRV090 | 56 – 5,000 | 4.0 | 35 | 24 |
| PC100 + GBC-NMRV090 | PC100 | GBC-NMRV090 | 56 – 5,000 | 5.5 | 35 | 28 |
| PC100 + GBC-NMRV110 | PC100 | GBC-NMRV110 | 56 – 5,000 | 7.5 | 42 | 38 |
📄 Need a CAD file? Contact our engineering team for 2D DXF or 3D STEP files for any PC + GBC-NMRV combination.
Selection Guide
To order the correct PC + GBC-NMRV combination, please confirm the following with our team or contact our engineers for assistance:
✔ Reducer model (PC size + NMRV size)
✔ Combined speed ratio required
✔ Input hole diameter / Input power / Input flange diameter
✔ Output hole or shaft size
✔ Any additional accessories (torque arm, output flange, motor, etc.)
Frequently Asked Questions
What does 'PC' mean in PC + GBC-NMRV?
PC refers to the helical pre-stage gear unit that is mounted before the NMRV worm stage. It uses helical (rolling) gears for high efficiency, and multiplies the overall ratio by adding a first reduction step before the worm drive.
What combined ratios are available?
The PC + GBC-NMRV combination can achieve ratios from approximately 56:1 up to 5,000:1, depending on the PC and NMRV sizes selected.
Why is the PC pre-stage more efficient than a double worm stage?
The PC helical pre-stage uses rolling gear engagement, which is inherently more efficient (≥90%) than the sliding contact of a worm drive (typically 60–85%). This means less heat, less energy waste, and longer service life.
What is the minimum order quantity (MOQ)?
No strict MOQ — orders from a single unit are accepted. Volume pricing improves at 10, 50, 100, and 500+ pieces.
Can you customise the combination or shaft dimensions?
Yes. Custom shaft diameters, shaft lengths, output flanges, and special PC+NMRV pairings are available. Lead time is typically 15–25 working days.
What is the typical lead time?
Standard combinations ship within 5–10 working days. Custom orders require 15–25 working days.
What warranty do you provide?
12-month warranty covering material and manufacturing defects under normal operating conditions.
What Our Customers Say
⭐⭐⭐⭐⭐
"We needed a 1,200:1 ratio in a compact space for a slow-speed rotary display. The PC080 + GBC-NMRV075 combination delivered exactly the torque and speed we needed at half the size of two separate gearboxes. Brilliant solution."
— Tom W., Mechanical Engineer,
Display Equipment Manufacturer · UK
⭐⭐⭐⭐⭐
"The helical pre-stage makes a huge difference in efficiency compared to our old NMRV+NMRV double worm setup. Running temperatures dropped noticeably and our energy bill went down. Very happy with the switch."
— Yuki M., Plant Manager,
Packaging Machinery · Japan
⭐⭐⭐⭐⭐
"Ordered 30 PC063+NMRV050 units for our textile tensioning machines. Quality is consistent, the compact design saved valuable floor space, and the technical team helped us optimise the ratio selection. Great service."
— Priya S., Engineering Manager,
Textile Machinery OEM · India
Related & Complementary Products
⚙️ GBC-NRV Shaft Input Worm Gearbox
Standard shaft-input worm reducer for coupling, belt, or chain-driven applications without a direct motor flange.
🔄 GBC-NMRV Flange Input Worm Gearbox
IEC-standard flange-input worm gear reducer for direct motor mounting — plug-and-play drive solution.
⚡ Three-Phase AC Induction Motors
IEC-standard electric motors from 0.06 kW to 15 kW for direct coupling with GBC worm gearboxes.
Ready to Get Started?
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Whether you need a single sample, a bulk OEM order, or a fully customised worm gearbox solution — our engineering and sales teams are ready to help. Tell us your application requirements and we will recommend the best PC + GBC-NMRV model, ratio, and configuration for your project.
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Warranty: 12 months | Shipping: Worldwide
The PC + GBC-NMRV is a compact two-stage speed reducer combining a helical pre-stage gear unit (PC) with a GBC-NMRV worm gearbox to achieve ultra-high reduction ratios up to 5,000:1. The helical pre-stage delivers over 90% transmission efficiency — significantly higher than a double worm arrangement — while the NMRV worm stage provides self-locking capability and right-angle output. Available in multiple PC + NMRV combination sizes with aluminum alloy housing, IEC motor flange compatibility, and universal mounting positions. Ideal for packaging machinery, textile equipment, food processing, electronic equipment, and any application requiring very low output speed with high torque. ISO 9001:2015 certified. Contact us for model selection and pricing.
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