Description
EPNRV130 Inch-Series Worm Gearbox
The EPNRV130 is our flagship inch-series single-stage worm gearbox, with a 130 mm centre distance, 1-3/4 inch output shaft and NEMA 210TC / 250TC motor flange compatibility. Rated output torque of 1,318 Nm across ratios from 5:1 to 100:1 at up to 7.5 kW motor input supports cement-plant auxiliary drives, heavy-duty NEMA-spec industrial applications, and mining-circuit primary-drive retrofits where the incumbent unit is an aging US heritage reducer at end of service life. The 37.8 kg aluminium-housed envelope remains substantially lighter than the cast-iron heritage equivalents.
EPNRV130 Specifications
Full technical data for the EPNRV130 inch-series worm gearbox. Values verified at end-of-line dynamometer test and retained on serial-number record for five years. Non-standard shaft modifications including hybrid metric-keyway-on-inch-shaft configurations and food-grade lubricant fills are available on request through our engineering desk.
| Specification | Value |
|---|---|
| Model designation | EPNRV130 |
| Configuration | Single-stage worm reducer, inch-series (NEMA-compatible) |
| Centre distance | 130 mm |
| Rated output torque | 1318 Nm |
| Reduction ratio range | 5:1 to 100:1 |
| Output shaft speed (4-pole 1,400 rpm input) | 14 – 280 rpm |
| Motor input power (max) | 7.5 kW |
| Output shaft diameter (solid) | 1-3/4″ (44.5 mm) |
| Output bore (hollow) | 1-3/4″ (44.5 mm) |
| Output keyway | 3/8″ square UNF |
| Output radial load capacity | 10480 N |
| Motor flange – NEMA C-face | 210TC / 250TC |
| Motor flange – IEC (where supported) | B5 |
| Mechanical efficiency (approximately) | 80 percent at mid-ratio |
| Housing material | ADC12 die-cast aluminium alloy |
| Worm shaft material | 20CrMnTi case-hardened alloy steel, ground ISO grade 6 |
| Worm wheel material | CuSn12 tin-bronze centrifugal casting |
| Lubricant | Synthetic PAG ISO VG 320 (factory fill, food-grade available) |
| Shaft seals | Viton (FKM) double-lip seals |
| Ingress protection | IP55 (labyrinth upgrade available) |
| Fastener standard | UNF (Unified Fine Thread, SAE J429 grade 5/8) |
| Mounting positions | B3, B6, B7, B8, V5, V6 |
| Assembled weight | 37.8 kg |
Engineering Features of the EPNRV130
Six design characteristics that distinguish the EPNRV130 inch-series worm gearbox from generic metric-only alternatives, particularly relevant where the driven-equipment interface is inch-dimensioned or the installation runs North-American-specified motor and coupling hardware.
IP55 Standard Ingress Protection
Standard IP55 ingress-protection rating, with labyrinth-seal output upgrade available for the most dust-intensive service in mining and grain-handling applications. Breather plug prevents internal pressure build-up during thermal cycling. Marine-grade paint system available for tropical-coastal bulk-terminal installations.
Six Mounting Orientations
Factory-supported mounting positions B3, B6, B7, B8, V5 and V6. Oil fill volume is factory-calibrated to the declared mounting orientation – vertical mounts (V5, V6) receive additional oil volume to ensure the worm-wheel engagement remains properly submerged at start-up.
100% End-of-Line Dynamometer Testing
Every unit is tested on a closed-loop dynamometer across the catalogue torque range. Noise measurement in a semi-anechoic booth, sump-temperature rise monitored during run-in, and output-shaft backlash verified against catalogue specification. Test record is retained per serial number for five years, with certificate of conformity issued per shipment.
Shared Inventory With NMRV Range
The internal worm-and-wheel gearing on the inch-series range is common with our NMRV metric-interface product. Field replacement of worn internal components can draw on the same spare-parts inventory. Mixed-standard Australian operations running both NMRV and NRV can stock a single set of replacement gearsets.
Stainless Fastener Upgrade Available
Stainless-steel UNF fastener upgrade available on request for food-processing, marine, and chemical-industry applications where the standard carbon-steel hardware would corrode in the operating environment. Upgrade is factory-fitted across all accessible external fasteners including mounting flange bolts and output-cover screws.
Inch-Dimensioned Output Shafts
Output shaft diameters from 1/2 inch through 1-3/4 inch depending on frame size, with standard UNF-keyway dimensions. Direct compatibility with inch-dimensioned drive pulleys, sprockets, and coupling hubs already in service on North-American-sourced equipment. Eliminates bushing-down adaptations or driven-equipment hub machining common with metric replacements.
Typical EPNRV130 Applications Across Australia
The EPNRV130 is specified across five primary Australian industry sectors where North-American-origin equipment, inch-dimensional interfaces, or NEMA motor flanges drive the specification. Each industry below represents real retrofit and OEM-build deployments.
Mining & Minerals Processing
In mining and minerals-processing service, the EPNRV130 supports slow-speed feeder auxiliary drives, sampling-equipment reducers and conveyor take-up drives at Pilbara, Kalgoorlie and Central Queensland operations running US-sourced Caterpillar, Joy Global and similar heritage equipment. The inch output shaft with UNF keyway matches the drive-coupling hardware already present in the installation. Marine-grade paint and labyrinth-seal output upgrade are both specified as standard on NEMA-compatible units destined for tropical-coastal bulk-terminal installations, matching the operational envelope of heritage US-spec equipment.
Material Handling & Logistics
For material handling duty, the EPNRV130 drives roller-bed conveyors, palletiser-cell indexing units and accumulator buffers built to North American OEM specifications or retrofitted onto US-imported handling equipment at Australian DC operations. The inch output shaft with UNF keyway matches existing drive-pulley bushings and sprocket hardware already in service, making the EPNRV130 a straight-swap option where the incumbent reducer is an aging NEMA catalogue unit from a US supplier. NEMA C-flange motor interface accepts the 56C, 140TC and 180TC frames common in imported equipment.
Food & Beverage Processing
In food and beverage processing, the EPNRV130 is specified into US-imported production lines at Australian dairies, craft breweries and meat processors where the line builder originally supplied NEMA C-flange motors and inch-dimensioned drive hardware. Retrofitting the original reducer with a metric-dimensional unit typically requires expensive machine-frame rework. The EPNRV130 preserves the inch output shaft diameter, UNF keyway dimensions, and NEMA flange spacing of the incumbent, enabling a direct bolt-in substitution at scheduled shutdown without driven-equipment modification.
Environmental & Water Treatment
For environmental and water-treatment applications, the EPNRV130 drives screw-conveyor sludge transport, grit-classifier augers and slow-speed mixer reducers at municipal plants operating US-sourced or North-American-specified equipment. The IP55 aluminium-housed construction matches the corrosion and splash-resistance requirement of chlorination and chemical-dosing zones, while the inch-dimensioned output interface lets plant maintenance source replacement reducers without requalifying the full driven-equipment assembly – a meaningful advantage on aging infrastructure where the original OEM is no longer available.
Agriculture & Primary Production
For agricultural applications, the EPNRV130 drives feed-conveyor systems, irrigation-pump drives and grain-handling augers built on US-sourced agricultural implements at NT, Queensland and WA rural holdings. American-branded equipment from John Deere, Case IH and similar manufacturers traditionally specifies NEMA C-flange motors and inch output-shaft reducers. The EPNRV130 is a directly compatible replacement for aging OEM reducers where the original equipment is still in service but the supplier-support chain has become unreliable.
How to Specify the EPNRV130 Correctly
The inch-series specification is driven by three interface-compatibility checks in addition to the standard torque-ratio-power verification: output shaft dimension and keyway geometry, motor flange standard, and mounting-footprint compatibility with any retrofit incumbent. Our engineering desk verifies all three against the customer-supplied drawings or photos of the installation before issuing a sizing recommendation.
1. Confirm Torque and Ratio
Required output torque falls within the 1318 Nm rating of the EPNRV130. Ratio range 5:1 through 100:1 covers output speeds from 14 – 280 rpm at a 4-pole input motor.
2. Verify Shaft Interface
Output shaft is 1-3/4″ diameter with 3/8″ square UNF keyway. Verify against the incumbent drive-coupling hub bore and keyway before ordering. Hybrid configurations are available on request.
3. Check Motor Flange
NEMA C-flange compatibility: 210TC / 250TC. IEC option: B5. Motor input capacity 7.5 kW maximum. Specify motor standard and frame size at quotation.
EPNRV130 Technical Questions
The most common technical questions our engineering desk receives on the EPNRV130 inch-series worm gearbox from Australian specifiers, OEM design engineers, and plant maintenance teams working with US-sourced or NEMA-specified equipment.
Is the EPNRV130 dimensionally compatible with Boston Gear or Winsmith catalogue units?
The EPNRV130 external mounting footprint, shaft height, and output-shaft-to-mounting-surface dimensions are matched to equivalent-frame NEMA catalogue reducers including the Boston Gear H-Series, Winsmith 900 series, and Textron catalogue equivalents. For direct retrofit verification on a specific in-service reducer, send the incumbent-unit dimensional drawings or photos to our engineering desk for comparative check before ordering.
What is the expected service life under continuous duty?
Under rated output torque with appropriate synthetic-oil fill, expect 20,000 to 30,000 service hours before measurable worm-wheel wear begins. Service life is substantially driven by sustained operating temperature, oil quality, and shock-load profile rather than the inch-vs-metric interface. Our dynamometer test record for each serial number provides the factory-verified initial backlash and efficiency baseline against which in-service wear can be tracked.
Are custom output shaft lengths or keyway configurations available?
Yes. Non-standard output-shaft lengths, double-extended output shafts for dual-drive applications, non-standard keyway positions, and metric-keyway-on-inch-shaft hybrid configurations are all available on request. Minimum-order-quantity requirements apply for non-catalogue shaft variants. Drawing-level specification is exchanged with our engineering desk during quotation.
Can you supply food-grade or washdown-tolerant variants of the EPNRV130?
USDA H1-rated synthetic lubricant factory fill, stainless-steel UNF fastener upgrade, and washdown-tolerant paint system for daily caustic CIP exposure are all available as factory-configured options. Specify the requirement at quotation stage – this allows the factory to configure the correct lubricant fill, seal material compatibility, and surface finish before the unit ships.
What certifications does the EPNRV130 carry?
Our quality management system is ISO 9001:2015 certified. The EPNRV130 carries CE conformity for European export, RoHS material compliance, and IP55 ingress-protection testing. Individual serial-number test records are retained at the factory for five years and certificates of conformity are issued per shipment. Application-specific certifications such as ATEX for hazardous-area installations are available on a project-configured basis.
Is the EPNRV130 self-locking at the output?
At combined ratios above approximately 30:1, the EPNRV130 exhibits self-locking behaviour at the output under static load conditions. This is a function of the worm-gear lead angle and applies across the inch-series range in the same way as the NMRV metric equivalent. The self-locking condition should not substitute a properly rated mechanical brake where a brake is a safety requirement.
What Engineers Say About the EPNRV130
Verified customer feedback from Australian and international engineering customers working with inch-dimensional specifications, US-sourced equipment retrofits, and NEMA motor-flange installations. Review text is paraphrased where necessary to protect commercial-in-confidence project detail.
The EPNRV130 supports aging US-branded agricultural implement retrofits at our rural customer base. The inch output shaft with UNF keyway matches existing drive-chain hardware on equipment from Case, John Deere and similar heritage suppliers. Field-failure rate through our first full service year is substantially lower than the equivalent generic imported reducers we previously distributed.
Specified the EPNRV130 into our sampling-system OEM product after qualification testing against the incumbent Boston Gear equivalent. Inch output shaft, NEMA flange, UNF fasteners – the EPNRV130 integrates with our established assembly-line hardware directly. Cold-weather operational performance at -30 degC ambient was confirmed on bench testing and subsequently in-service.
Stocking the EPNRV130 as an alternative to the legacy US-catalogue supply we had carried for the past 20 years. Customer feedback from our agricultural-implement dealer network has been encouraging and field-return rates over the first stocking season are notably below the competing imported-reducer alternatives we had previously trialled.
Carrying the EPNRV130 as a cross-referenceable replacement for aging Boston Gear and Winsmith inch-series units on customer maintenance-refresh cycles. The dimensional equivalent-to-catalogue retrofit compatibility made the product introduction at the counter-sales level straightforward for our technical sales staff.
The EPNRV130 supports our North-American-bound equipment exports where NEMA motor standard and inch-shaft coupling are the customer-specified norm. Build quality on sample inspection met our manufacturing-procurement standards, and supply reliability across 18 months of regular shipments has been consistent.
Related Inch-Series Configurations
Three related inch-series frames across different torque and shaft-dimension envelopes. If the EPNRV130 is close but not exactly matched to your installation, the alternatives below may provide a better interface fit.
Browse the full NRV inch-series range or compare with the NMRV metric equivalents.
Ready to Specify the EPNRV130?
Send your incumbent-reducer dimensional drawings, photos, or OEM part numbers to our Australian engineering desk for a direct retrofit compatibility check. Technical enquiries are handled by the engineer responsible for the product, not a generic sales desk.
