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The Stainless Steel GR Rotex Keyway Coupling for Motor is a jaw-type elastomeric coupling with stainless steel hubs and a replaceable spider insert. The keyed bore at each hub transmits motor torque through a positive key engagement, while the spider absorbs vibration, misalignment and shock loads between the motor shaft and the driven shaft. Stainless steel construction makes this coupling the standard choice for food and beverage lines, pharmaceutical skids, chemical dosing systems, marine deck equipment and any environment where washdown or corrosive atmosphere would corrode a painted or plated steel coupling.
Raydafon supplies the Stainless Steel GR Rotex Keyway Coupling for Motor from the Ningbo factory as an ISO 9001 certified manufacturer. Standard sizes run from GR19 to GR90 with further sizes available on request. The spider insert is available in NBR, polyurethane, Hytrel and other elastomers depending on the torque requirement and the temperature range. Keyway, bore size, hub length and surface finish are confirmed at the quotation stage.
A Stainless Steel GR Rotex Keyway Coupling for Motor is a three-piece jaw-type elastomeric coupling that connects a motor shaft to a driven shaft. It consists of two stainless steel hubs with curved jaws and a single spider insert between them. Each hub is bored and keyed so it locks onto the shaft through a positive key engagement rather than a clamp screw alone. The spider insert teeth sit between the hub jaws and take up the torque: as the driver hub rotates, the spider teeth compress against the driven hub jaws, so vibration, angular misalignment and shock load are absorbed by the elastomer before they reach the driven shaft.
Stainless steel construction is the reason this coupling is specified on washdown and corrosive-atmosphere machinery. A painted or plated steel coupling on a food line will lose its coating within a few cleaning cycles and start to corrode; the stainless steel GR Rotex Keyway Coupling for Motor is produced in 304 or 316 stainless so the surface stays intact through repeated CIP and caustic washdown. The spider insert can be replaced in place without dismantling the drive, so maintenance cost over the coupling's life stays low.
The table below lists the full material and construction specification of the Stainless Steel GR Rotex Keyway Coupling for Motor. Bore, keyway and hub length are confirmed at the quotation stage against the actual motor and driven shaft dimensions.
The table below lists the standard size range of the stainless steel GR Rotex coupling for motor applications. Values follow the standard Rotex GR series. Where a non-standard stainless steel spider or a wider hub is required, the torque rating is confirmed at the quotation stage.
| Model | Rated Torque (N·m) | Max Torque (N·m) | Max Bore (mm) | Max Speed (rpm) |
|---|---|---|---|---|
| GR19 | 10 | 20 | 19 | 14,000 |
| GR24 | 35 | 70 | 28 | 14,000 |
| GR28 | 95 | 190 | 38 | 11,000 |
| GR38 | 190 | 380 | 45 | 9,000 |
| GR42 | 265 | 530 | 55 | 8,000 |
| GR48 | 420 | 840 | 60 | 7,000 |
| GR55 | 660 | 1,320 | 70 | 6,000 |
| GR65 | 1,140 | 2,280 | 80 | 5,000 |
| GR75 | 1,650 | 3,300 | 95 | 4,500 |
| GR90 | 2,850 | 5,700 | 110 | 3,500 |
Values above follow the standard GR series with NBR spider. For stainless steel spider inserts, higher temperature elastomers or a non-standard bore and keyway, send the actual motor and driven shaft dimensions and Raydafon will confirm the correct size before shipping.
The difference between a stainless steel GR Rotex coupling and a standard painted or plated steel coupling is the operating environment. The four advantages below are the reason stainless steel is the standard specification on food, pharmaceutical and marine drive systems.
A painted coupling loses its coating after the first few caustic or acid washdown cycles. A stainless steel GR Rotex coupling keeps its surface through the full service life of the machine, which is the reason it is specified on food and beverage lines.
304 or 316 stainless does not rust in humid, steam-exposed or chemical-vapour environments where a plated steel coupling would start to show surface oxidation within months.
Stainless steel surfaces are non-porous and do not harbour residues, which makes the coupling suitable for CIP (clean-in-place) and SIP (sterilise-in-place) food and pharmaceutical equipment.
Salt spray and marine atmosphere quickly corrode a painted coupling. The stainless steel GR Rotex Keyway Coupling for Motor is the standard choice on marine deck machinery, offshore skids and washdown equipment.
The Stainless Steel GR Rotex Keyway Coupling for Motor is specified wherever a motor drives a pump, gearbox or other rotating equipment in a corrosive or washdown environment. The application categories below are the ones most often ordered from Raydafon.
Motor-driven pumps, mixers, agitators, conveyors and fillers on food processing lines where the coupling has to survive regular CIP and caustic washdown.
Motor-to-pump drives on pharmaceutical skids, sterile mixing vessels and cleanroom equipment where non-porous, non-shedding surfaces are mandatory.
Motor-to-dosing-pump drives where the coupling is exposed to chemical vapours, acid mist or alkaline splash from the process itself.
Deck machinery, winch drives, seawater pumps and offshore skids where salt spray and marine atmosphere require a non-corroding coupling.
Motor-pump couplings on water treatment, desalination and wastewater plant where the coupling is exposed to humidity, splash and chemical dosing atmosphere.
Conveyors, cartoners and packaging equipment on wet or washdown production lines where painted steel couplings are not permitted by food safety rules.
The Stainless Steel GR Rotex Keyway Coupling for Motor is bored to the actual motor and driven shaft dimensions at the time of order. The options below are the ones most often specified. Non-standard keyway sizes and stepped bores can be produced to a drawing or sample.
Send the actual motor shaft diameter, driven shaft diameter and required keyway size. Raydafon will match the correct GR Rotex coupling size and hub bore, then confirm the lead time and price against the quantity ordered.
To confirm the correct Stainless Steel GR Rotex Keyway Coupling for Motor and issue a quotation, Raydafon needs the five items below. For a straight replacement of an existing Rotex coupling, the original model number and the two shaft diameters are usually enough.
Send the five items below and Raydafon will confirm the specification, bore, keyway and lead time within one working day.
The Stainless Steel GR Rotex Keyway Coupling for Motor is used to connect a motor shaft to a driven shaft on pumps, mixers, gearboxes and conveyors in corrosive or washdown environments. It is the standard drive coupling on food, beverage, pharmaceutical, chemical, marine and water treatment equipment where a painted or plated steel coupling would corrode.
The GR series is the standard Rotex coupling with NBR spider and aluminium or stainless steel hubs. The GS series is a higher torque version with a heavier hub. The GE series is the same coupling with a different hub profile for specific mounting conditions. Raydafon can supply the standard GR series in stainless steel or produce the equivalent GS or GE configuration to a drawing.
Yes. The spider insert is a single elastomer ring that sits between the two hubs. It can be pulled out and replaced without removing the hubs from the shafts, so maintenance down time on the machine is measured in minutes rather than hours.
Both 304 and 316 stainless steel are available. 304 covers most food, pharmaceutical and general washdown applications. 316 is specified for higher corrosion environments such as marine, offshore, chemical dosing and pharmaceutical clean-in-place systems. Confirm the grade required at the quotation stage.
The standard GR Rotex coupling range covers bore sizes from 6 mm to 110 mm, rated torque from 10 N·m (GR19) to 2,850 N·m (GR90), and max speed from 14,000 rpm down to 3,500 rpm. Larger sizes (GR110 to GR180) and higher torque ratings are available on request.
NBR is the standard spider for general applications with a temperature range of -40 °C to +100 °C. Polyurethane (PU) offers higher torque capacity and better wear resistance under shock load. Hytrel is specified for higher temperature up to +150 °C. Viton is available for chemical resistance. Confirm the actual duty cycle and ambient temperature and Raydafon will recommend the correct spider.
Yes. Send the actual motor shaft diameter, driven shaft diameter and required keyway standard (DIN 6885, JIS or ANSI). Raydafon will produce the correct hub bore and keyway to suit the shaft. Non-standard hub lengths, stepped bores and set-screw configurations are also available on request.
Standard configurations ship in 15 to 30 days. Custom bore, keyway or spider configurations are confirmed with the quotation. As an OEM manufacturer, Raydafon can supply from single units up to full production quantities. MOQ depends on the specific configuration and is confirmed when the specification is fixed.
Every Stainless Steel GR Rotex Keyway Coupling for Motor shipment includes an outline drawing, a material certificate (3.1 on request) and a dimensional inspection report. Third-party inspection can be arranged when the project specification calls for it.
Whether you are replacing a corroded coupling on a food line, specifying stainless steel Rotex couplings for a new pharmaceutical skid, or sourcing GR series couplings in volume for a distributor network, Raydafon can quote the Stainless Steel GR Rotex Keyway Coupling for Motor or a custom equivalent to your torque, bore, keyway and spider material requirements. OEM and project quantities supplied directly from the Ningbo factory.
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