Reliable Worm Gearboxes from China, Built for Industrial Performance

Noisy gearbox? Failed drive unit? Limited installation space? PRT Metal supplies reliable worm gearboxes from China, engineered for smooth transmission, compact mounting, and dependable industrial performance.

Smooth & Quiet Operation
Compact & Flexible Installation
Cost-Effective Replacement
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PRODUCT CATEGORIES

Worm gearboxes—also referred to as worm gear reducers or worm drive gearboxes—utilize a worm and worm wheel system to reduce speed and increase torque. Featuring stable transmission, compact structure, and flexible application, they are widely used in conveyors, packaging machines, and automated systems. PRT Metal provides reliable worm gearbox solutions for both replacement and OEM applications.

WP Series Cast Iron Worm Gearboxes

PRT Metal supplies a complete range of WP series cast iron worm gearboxes, including WPA, WPS, WPO, and WPX models, covering sizes 40–250, reduction ratios from 10 to 60, input power up to 33.2 kW, and output torque up to 2745 N·m. Built with a heat-treated steel worm shaft and tin bronze worm gear, the WP series delivers smooth transmission, low noise, good wear resistance, and strong load capacity. With multiple mounting styles, B5 motor flange compatibility, and flexible shaft arrangements such as A / B / C / D / E, WP gearboxes are suitable for conveyors, plastic machinery, metallurgy equipment, mining machinery, lifting systems, chemical machinery, construction machinery, and other industrial drive applications.
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NRV / NMRV Aluminum Worm Gearboxes

PRT Metal supplies NRV / NMRV aluminum worm gearboxes in sizes 25–150, with reduction ratios from 5:1 to 100:1, input power up to 15 kW, and output torque up to 2379 N·m. Featuring a compact die-cast aluminum housing, lightweight structure, low-noise operation, and good heat dissipation, they are ideal for space-limited drive systems. Compatible with IEC B5 / B14 motors, servo motors, stepper motors, and DC motors, NRV / NMRV gearboxes support flexible motor connection and installation. They are widely used in automation equipment, conveyors, packaging machines, food processing lines, textile machinery, and compact industrial applications.
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VF Series Worm Gearbox

PRT Metal supplies VF series worm gear motors in sizes VF30–VF150, with reduction ratios from 7 to 10,000, output speed from 0.3 to 400 r/min, output torque from 11 to 2700 N·m, and power range from 0.04 to 15 kW. Designed with a compact housing, smooth transmission, low noise, good heat dissipation, and reliable torque output, the VF series is suitable for light to medium-duty industrial drive systems. It can be supplied with keyed hollow shaft, solid shaft output, IEC motor flange, solid input shaft, optional torque limiter, helical-worm combination, or double-worm reduction, providing flexible drive solutions for food machinery, printing equipment, woodworking machines, textile machinery, rubber machinery, chemical equipment, plastic machinery, and other industrial applications.
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Complete Worm Gearbox Range with Flexible Configurations

Whether you need WP series or RV series worm gearboxes, we provide a wide selection of models and mounting options to fit your equipment layout. From square or round flanges to hollow shafts, single or double input shafts, single or double output shafts, torque arms, and double-stage reducers, each configuration can be flexibly matched with three-phase motors, servo motors, or stepper motors for reliable and efficient power transmission.

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Premium Internal Components. Longer Gearbox Life

Our worm gearbox is built with upgraded core components for stable and long-lasting operation. The 20Cr carburized and quenched worm shaft provides high hardness and wear resistance, while the CuSn12Ni2 bronze worm gear (UNI7013-10) is thickened from the common 9mm to 12mm for stronger load capacity and better durability. Precision bearings from leading Chinese brands ensure high accuracy, high-speed performance, and low noise, while branded oil seals provide reliable sealing and help prevent oil leakage.

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Quiet Operation. Strong Torque. Stable Output

Our worm gearboxes are designed with noise-reduction optimization, small transmission clearance, and smooth output performance. They run quietly and stably while delivering strong torque, high efficiency, and reliable power transmission. This helps reduce energy consumption, improve equipment efficiency, and support safer, longer-lasting operation.

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Why Choose PRT Metal for Industrial Gearbox？

PRT Metal focuses on supplying worm gearboxes for OEM replacement, small-batch production, and fast delivery requirements.
With flexible machining capability, we support non-standard configurations, dimensional matching, and drawing-based production to fit existing equipment without redesign.
Our production setup allows quick response for urgent orders and small quantities, making us suitable for maintenance projects, equipment upgrades, and custom industrial applications.
We use verified materials and stable suppliers to ensure consistent performance and service life under real working conditions.

ISO90001 controlled Quality System
Flexible Customization Capability
Integrated Motor Compatibility

Listen to what they say about our products

You can learn about the experience of using our products from them

Very accomodating,good quality products,been ordering since 2023 and they never failed me since then..keep up the good work..

Retail and wholesale supplier from the Philippines

Great experience from start to finish. All information was explained in detail, and communication was fantastic. The worm gear reducer matched our requirements, the quality was solid, and it helped us complete the repair without major modifications.

Maintenance Manager, Steel Processing Plant, USA

Review:
Everything went well from order confirmation to final delivery. The seller was very professional, responsive, and competent throughout the whole process. I highly recommend working with them.
Rating:
Service: 10/10 · Delivery: 10/10 · Quality: 10/10 · Design: 10/10

Purchasing Manager, Industrial Equipment Company, France

Frequently asked questions

PRT Metal supplies Chinese-made NMRV and NRV aluminum worm gearboxes that can be used as cost-effective replacements for many international worm gearbox brands, including Motovario, Bonfiglioli, STM, SITI, Varvel, Chiaravalli, Transtecno, Rossi, NORD, SEW, Lenze, and Boston Gear.

Our NMRV gearboxes are suitable for motor flange input applications, while NRV gearboxes are designed for solid input shaft connections. Replacement can be selected according to gearbox size, ratio, input flange, output bore, mounting dimensions, motor power, and torque requirements.

Chinese NMRV Motovario SITI STM Varvel
NMRV25 NMRV25 MU25 UMI25 SRT28
NMRV30 NMRV30 MU30 UMI30 SRT28
NMRV40 NMRV40 MU40 UMI40 SRT40
NMRV50 NMRV50 MU50 UMI50 SRT50
NMRV63 NMRV63 MU63 UMI63 SRT60
NMRV75 NMRV75 MU75 UMI75 SRT70
NMRV90 NMRV90 MU90 UMI90 SRT85
NMRV110 NMRV110 MU110 UMI110 SRT110
NMRV130 NMRV130 — — —
NMRV150 NMRV150 — — —

Note:
This table is for preliminary model cross-reference only. Equivalent replacement should be confirmed according to gearbox size, reduction ratio, input flange, output bore, shaft arrangement, mounting dimensions, motor power, output torque, and actual working conditions.

Worm gearboxes usually have lower efficiency (60%–90%) compared to helical gearboxes due to sliding contact.

Lower ratios = higher efficiency
Higher ratios = lower efficiency

Common reasons:

  • High reduction ratio
  • Continuous heavy load
  • Insufficient lubrication
  • Poor ventilation

A moderate temperature rise is normal, but overheating indicates improper selection or working conditions.

  • Hollow shaft: direct mounting on driven shaft (compact, common)
  • Solid shaft: requires coupling (more flexible alignment)

With proper selection and lubrication:

  • Light duty: 8,000–12,000 hours
  • Continuous industrial use: depends on load and maintenance

WPA, WPX and NMRV are different series of worm gearboxes, mainly differing in structure, material, and application focus.

WPA / WPX / NMRV Worm Gearbox Model Comparison

Choosing the right worm gearbox model can be confusing because different markets use different naming systems. WPA, WPX and NMRV gearboxes are all 90-degree worm gear reducers, but they are often used in different replacement, industrial and export applications.

Model Cross Reference

Center Distance WPA Series WPX Series NMRV Series Typical Use
30 mm WPA30 WPX30 NMRV030 Small automation equipment
40 mm WPA40 WPX40 NMRV040 Light conveyor drives
50 mm WPA50 WPX50 NMRV050 Packaging machines, small conveyors
63 mm WPA60 / WPA63 WPX60 / WPX63 NMRV063 General industrial equipment
75 mm WPA70 / WPA75 WPX70 / WPX75 NMRV075 Conveyor systems, mixers
90 mm WPA80 / WPA90 WPX80 / WPX90 NMRV090 Medium-duty machinery
110 mm WPA100 / WPA110 WPX100 / WPX110 NMRV110 Heavy conveyor drives
130 mm WPA120 / WPA130 WPX120 / WPX130 NMRV130 Industrial transmission systems
150 mm WPA135 / WPA150 WPX135 / WPX150 NMRV150 Heavy-duty replacement applications

Yes.

We can supply:

  • Gearbox only
  • Gearbox + motor assembly
  • IEC motor compatible solutions

WPO, WPA, WPS and WPX are different structural types of WP series cast iron worm gearboxes. Their main difference is the mounting style and input/output shaft arrangement. WPO is commonly used as a basic standard model, WPA and WPS offer different installation directions and motor connection options, while WPX provides multiple shaft arrangements such as A / B / C / D / E for more flexible equipment layouts.

We provide the best

We make it simple and efficient to get the high-quality Gear Reducer you need. Here's our 3-step process:

    01

    Inquiry & Quote
    Send us you output speed, motor power, output torque, Installation type etc，and we'll deliver a tailored quote with detailed specifications and pricing.

    02

    Order & Production
    Once the order is confirmed and the initial payment is made, we'll begin production. You'll receive regular updates on the manufacturing progress.

    03

    Payment & Delivery
    Complete the final payment, and we'll arrange the delivery of your products to your preferred location with all necessary documentation.

Struggling to Find the Right Gearbox ?

You provide the technical information like output speed, motor power, output torque, Installation type etc — and we'll deliver a tailored quote with detailed specifications and pricing within 24 hours.

Phone
+86 17751766219
Email
sharon@czprt.com
Address
No. 18, Xingao Road, Niutang Town, Wujin District, Changzhou, Jiangsu Province, China
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