What lubrication is required?

Synthetic or worm gear oil (220#). First change after 200–400 hours, then every 4,000 hours.

GBC-NMRV-F Aluminum Worm Gearbox with Flange Output

The GBC-NMRV-F is a flange-input, flange-output aluminum worm gearbox that connects directly to IEC motors, CVTs, and electromagnetic clutch brake units without a coupling. The square output flange is available in short (FA) and long (FB) configurations for rigid, precisely aligned bolt-on connection. Available in frame sizes NMRV025–NMRV185 with ratios from 5:1 to 100:1 and input power from 0.06 kW to 15 kW. Die-cast aluminum housing with shot-blasting and phosphating anti-corrosion treatment, nickel bronze worm gear, carburized and nitrided 20Cr worm shaft, NAK/SKF seals, and SKF/C&U bearings. ISO 9001:2015 certified. Contact us for competitive pricing and fast delivery.

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Description

The GBC-NMRV-F is a flange-input, flange-output worm reducer that combines the versatility of the NMRV series with a square output flange for rigid, precisely aligned bolt-on connection to driven equipment. The IEC-normalised input flange connects directly to AC motors, DC motors, servo motors, continuously variable transmissions, and flanged electromagnetic clutch brake units without the need for an external coupling — saving installation time and reducing alignment errors.

The output flange is available in short (FA) and long (FB) configurations. The standard FA flange suits most general applications, while the FB long flange provides additional axial engagement depth for heavy radial or axial loads. Available in frame sizes from NMRV025 to NMRV185, with ratios from 5:1 to 100:1 and input power from 0.06 kW to 15 kW, the GBC-NMRV-F covers an exceptionally wide range of speed reduction applications.

Every unit is manufactured under ISO 9001:2015 quality control. The housing is die-cast aluminum alloy (sizes 025–090) with shot-blasting and anti-corrosion phosphating treatment, or cast iron for larger sizes (110–150). The worm gear is precision-machined from a special wear-resistant nickel bronze alloy, and the worm shaft is 20Cr steel with carburization and nitriding for superior surface hardness. We use NAK/SKF oil seals, Shell-grade lubricant, and SKF/C&U bearings as standard. Contact us for a free engineering consultation.

GBC-NMRV-F aluminum worm gearbox with flange output — IEC motor input, square FA/FB output flange, aluminum alloy housing

Technical Specifications

Parameter	Details
Product Name	GBC-NMRV-F Aluminum Worm Gearbox with Flange Output
Available Models	GBC-NMRV/GBC-NRV 025, 030, 040, 050, 063, 075, 090, 110, 130, 150, 185
Input Configuration	IEC Motor Flange (PAM) · Solid Shaft · Worm Shaft Extension
Output Configuration	Square Flange Output — Short (FA) / Long (FB) · Solid Shaft · Torque Arm
Gear Ratio Range	5, 7.5, 10, 15, 20, 25, 30, 40, 50, 60, 80, 100
Input Power	0.06 kW – 15 kW
Housing Material	Die-cast aluminum alloy (025–090) — shot-blasted & phosphated · Cast iron (110–150)
Worm Gear Material	Special wear-resistant nickel bronze alloy
Worm Shaft Material	20Cr steel — carburized & nitrided
Output Shaft Material	Chromium steel 45#
Bearings	SKF / C&U (custom brand available)
Seals	NAK / SKF
Lubricant	Synthetic oil / Worm gear oil (Shell grade)
Flange Standard	PAM / IEC
Color Options	Blue / Silver Grey (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

Features & Benefits

✅ Flange Output (FA / FB)

Rigid square flange interface eliminates coupling misalignment. Short (FA) for standard use; long (FB) for heavy axial/radial loads.

✅ Direct Motor Connection — No Coupling Required

IEC flange input connects directly to motors, CVTs, and electromagnetic clutch brakes, reducing parts count and installation time.

✅ Nickel Bronze Worm Gear

Special wear-resistant alloy delivers superior durability and lower friction compared to standard tin bronze.

✅ Carburized & Nitrided 20Cr Worm Shaft

Dual heat treatment achieves exceptional surface hardness and core toughness for maximum fatigue resistance.

✅ Lightweight Aluminum with Anti-Corrosion Treatment

Shot-blasted and phosphated housing resists corrosion even in humid or mildly chemical environments.

✅ Self-Locking Worm Drive

At higher ratios, output cannot be back-driven — inherent holding capability without external brakes.

✅ Wide Ratio Range 5:1 to 100:1

Single-stage coverage for virtually all speed reduction needs. Combine with a second stage for ratios above 100:1.

✅ Universal Mounting & Large Torque

All-direction mounting with high output torque and smooth, stable operation.

GBC-NMRV-F worm gearbox close-up showing aluminum housing, IEC input flange, and square output flange

Applications

The GBC-NMRV-F flange-output worm gear reducer is used across a wide range of industries where a rigid output connection and direct motor mounting are required.

🏭

Food & Beverage

Conveyor drives, mixers, bottling lines — flange output ensures hygienic, vibration-free mounting.

📦

Packaging & Printing

Carton sealers, labellers, print rollers requiring precise alignment via square flange.

🤖

Automation & Machine Tools

CNC auxiliaries, indexing tables, robotic drives.

⚙️

Ceramics & Glass

Kiln drives, tile glazing lines, cutting tables operating under dust and heat.

👕

Textile & Dyeing

Looms, spinning frames, dyeing equipment needing smooth power delivery.

⚛

Environmental & Chemical

Aerators, mixers, pumps in corrosive or humid environments.

🏫

Conveyor & Material Handling

Belt conveyors, screw feeders, bucket elevators.

⚡

Woodworking & Plastics

CNC routers, extruders, injection moulding peripherals.

GBC-NMRV-F worm gearbox manufacturing facility — quality-controlled production line

Output Flange Dimensions

Below are the output flange dimensions for the GBC-NMRV-F series in FA (short) and FB (long) configurations.

GBC-NMRV-F worm gearbox output flange FA/FB dimensional drawing

Model	DF (mm)	D0 (mm)	PCD (mm)	b3-FA (mm)	b3-FB (mm)	n × d
GBC-NMRV-F030	62	40	50	6	16	4 × Φ5.5
GBC-NMRV-F040	80	50	65	7	18	4 × Φ6.5
GBC-NMRV-F050	100	70	85	7.5	20	4 × Φ6.5
GBC-NMRV-F063	120	80	100	8	22	4 × Φ8.5
GBC-NMRV-F075	140	100	120	9	25	8 × Φ8.5
GBC-NMRV-F090	160	110	140	10	28	8 × Φ8.5
GBC-NMRV-F110	200	145	175	12	32	8 × Φ10.5
GBC-NMRV-F130	250	175	215	14	36	8 × Φ12.5
GBC-NMRV-F150	280	200	250	16	40	8 × Φ12.5

DF = Flange outer diameter · D0 = Pilot spigot diameter · PCD = Bolt circle diameter · b3-FA = Short flange thickness · b3-FB = Long flange thickness

📄 Need a CAD file? Contact our engineering team for 2D DXF or 3D STEP files for any GBC-NMRV-F model.

How Does a Worm Gear Reducer Work?

A worm gear reducer uses a helical screw (the "worm") to engage the teeth of a perpendicular gear wheel (the "worm gear"). As the motor drives the worm, its spirals push the worm gear teeth, causing the output shaft to rotate at a reduced speed with multiplied torque. The right-angle configuration between input and output shafts makes the design inherently space-efficient.

Higher reduction ratios can be achieved by increasing the worm gear's circumference or reducing the number of worm threads. Compared with multi-stage spur gear trains that require more components and space, a single worm gear stage delivers the same reduction in a far more compact package — lowering cost and reducing the risk of component failure.

Installation Precautions

⚠️ After installation, thoroughly check the accuracy of the mounting position and verify all fasteners are secure.

⚠️ Before first run, remove the screw plug from the vent hole and replace it with the breather plug.

⚠️ Check and adjust the oil level according to your mounting position before starting.

⚠️ Run a no-load test for at least 2 hours — operation should be smooth, without impact, vibration, noise, or oil leakage.

⚠️ When mounting transmission members onto the output shaft, never strike with a hammer — use assembly jigs and bolts to press the component into place.

Operation & Maintenance

🛠 First oil change: After 200–400 operating hours.

🛠 Subsequent oil changes: Every 4,000 operating hours.

🛠 Each gearbox is fully filled with lubricant oil after assembly at the factory.

🛠 Maintain adequate lubricant level in the housing and check at scheduled intervals.

Frequently Asked Questions

What is the difference between FA and FB output flange?

FA is the standard short output flange for most applications. FB is a longer flange providing greater axial engagement depth — ideal for heavy radial or axial load conditions.

Can I connect any IEC motor directly?

Yes. The GBC-NMRV-F accepts IEC-standard flanges from 56B5 to 160B5, covering virtually all standard motors from 0.06 kW to 15 kW.

Can you customise the flange dimensions or housing colour?

Yes. We routinely supply custom flange bolt patterns, non-standard shaft lengths, special paint colours, and unique ratio configurations. Typical lead time is 15–25 working days.

What is the typical lead time?

Standard models are in stock and ship within 3–7 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 lubrication does the gearbox require?

Synthetic oil or worm gear oil (220# recommended). First change after 200–400 hours; subsequent changes every 4,000 hours.

Can the GBC-NMRV-F be combined with other gearboxes?

Yes. Common combinations include NMRV+NMRV double stage, NMRV+NRV, NMRV+PC pre-stage, NMRV+UDL variator, and NMRV+motor direct assembly.

What Our Customers Say

⭐⭐⭐⭐⭐

"The FA flange output gave us a much more rigid connection than shaft coupling. Vibration dropped noticeably on our ceramic glazing line. The nickel bronze gear seems to be wearing better than our old units too."

— Marco B., Maintenance Manager,

Ceramics Machinery · Italy

⭐⭐⭐⭐⭐

"We needed NMRV-F075 with FB long flanges for vertical screw conveyors. The self-locking function eliminates our separate brakes, and the phosphated aluminum housing handles the humid food plant environment perfectly."

— Chen L., Engineering Director,

Food Processing Equipment · China

⭐⭐⭐⭐⭐

"Ordered 40 units with custom silver paint for our OEM packaging machines. Delivered in 12 days, all dimensionally perfect. Technical support was responsive and helpful throughout."

— Anna S., Product Designer,

Packaging Machinery OEM · Australia

Related & Complementary Products

⚙️ GBC-NRV Shaft Input Worm Gearbox

Standard shaft-input worm reducer for coupling, belt, or chain-driven applications.

🔄 GBC-NMRV Flange Input Worm Gearbox

IEC flange-input worm gear reducer for direct motor mounting.

⚡ Three-Phase AC Induction Motors

IEC motors from 0.06–15 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 requirements and we will recommend the best GBC-NMRV-F configuration for your project.

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Warranty: 12 months | Shipping: Worldwide

The GBC-NMRV-F is a flange-input, flange-output aluminum worm gearbox that connects directly to IEC motors, CVTs, and electromagnetic clutch brake units without a coupling. The square output flange is available in short (FA) and long (FB) configurations for rigid, precisely aligned bolt-on connection. Available in frame sizes NMRV025–NMRV185 with ratios from 5:1 to 100:1 and input power from 0.06 kW to 15 kW. Die-cast aluminum housing with shot-blasting and phosphating anti-corrosion treatment, nickel bronze worm gear, carburized and nitrided 20Cr worm shaft, NAK/SKF seals, and SKF/C&U bearings. ISO 9001:2015 certified. Contact us for competitive pricing and fast delivery.