105mm Bore Heavy-Duty N221M Cylindrical Roller Bearings for Heavy Mining Crushers
| Item No : | N221M / N221-M |
| Size (d*D*B) : | 105x190x36mm |
| Material : | |
| Lead Time : | 3-5 days |
| Weight : | 4KG |
| MOQ : | 1 pcs |
⚙️Product Description:
The N221M (105x190x36mm) is a heavy-duty single-row cylindrical roller bearing featuring a solid machined brass cage (M-type) and an N-design outer ring architecture with no ribs (double-ribbed inner ring, smooth inner bore outer ring). Featuring a 105mm inner bore, 190mm outer diameter, and 36mm width, it allows axial displacement of the shaft relative to the housing in both directions within specified limits. Built with high-purity GCr15 chrome steel rollers and precision raceways, the solid brass cage provides exceptional guidance, vibration resistance, and high-speed stability under extreme heavy radial loads. We supply these robust industrial bearings under our proprietary RMO brand while supporting global multi-brand OEM direct sourcing for heavy machinery, gear reducer, and steel mill equipment builders.
⚙️Product Features:
- Solid Machined Brass Cage (M-Type): Heavy-duty brass retainer resists high temperature, severe shock loads, and centrifugal forces under high-speed operation.
- N-Design Non-Locating Axle Float: Ribless outer ring permits unconstrained bi-directional axial shaft movement, accommodating thermal expansion without axial preload.
- Exceptional Line-Contact Radial Load: Precision-ground cylindrical rollers deliver maximum contact surface area for heavy dynamic radial forces and shock loads.
- Precision Separation & Mounting: Inner ring with roller-and-cage assembly can be mounted independently from the smooth outer ring, streamlining assembly and inspection.
⚙️Product Application:
Engineered for severe vibration environments, unconstrained shaft expansion, and heavy radial forces, the N221M cylindrical roller bearing is widely specified in:
- Industrial gearboxes & drive trains: heavy-duty speed reducers, planetary gear drives, and mill drive gearboxes.
- Mining & quarry equipment: jaw crushers, vibrating screens, conveyor drive pulleys, and pulverizer shafts.
- Metal processing & steel mills: rolling mill drive shafts, continuous casting machines, and heavy shear line drives.
- Heavy power & marine machinery: large electric motors, wind turbine gearboxes, and marine propulsion shafting.
⚙️Precautions:
| 1. Keep clean | 2. Use with caution | 3. appropriate tool | 4. Hot-loading | 5. Be careful of rust |
| Dust will have a bad effect on the bearing, so keep the surrounding clean. | Strong impact during use can easily cause scratches and indentations. | Avoid replacing existing tools, and use appropriate tools. | Bearings are precision parts, so hot installation is recommended. | Sweat on your hands during operation will cause rust, so it is best to wear gloves. |
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⚙️Obtain Certificate:
About Rimao
Since its establishment in 2011, Rimao Bearing has combined international vision with local wisdom and injected innovative ideas into every bearing and pulley with its profound industry accumulation and unremitting pursuit of technology. We have not only passed CE and ROHS certification, but also set a new benchmark in the industry and led the development trend of the bearing industry.
We are not just a ball bearing and roller bearing importer and wholesaler. We provide real solutions to help you achieve the product and design goals set by your customers. With more than 20 years of production and sales experience, tens of thousands of models and specifications, we look forward to cooperating with you!
⚙️Technical Parameters:
| Model No. | |
| Bearing Type | Single Row Cylindrical Roller Bearing |
| Dimensions | |
| Structural Architecture | N Type (Inner ring with double ribs, Outer ring without ribs) |
| Axial Displacement | |
| Cage Material & Type | Solid Machined Brass Cage / M-Type |
| Roller & Ring Material | GCr15 / 52100 Chrome Bearing Steel |
| P0 / P6 (ABEC-1 / ABEC-3) | |
| Target Application | Gearboxes, Crushers, Steel Mills, Motors |
| Brand | RMO (Own Brand) / Neutral / OEM Custom / Other Global Brands |
| Package | Individual plastic bag, plastic tube or original RMO brand box |
| Lead Time | 3-5 days for stock; 7-15 days for bulk orders |
| Shipping | Express (DHL/FedEx/UPS), Air Freight, Sea Freight |
| Payment | 100% T/T, or 30% T/T In Advance, 70% T/T After Finished Production |
| Model No. | d | D | H | m |
| N204 | 20 mm | 47 mm | 14 mm | 0.11 KG |
| N205 | 25 mm | 52 mm | 15 mm | 0.14 KG |
| N206 | 30 mm | 62 mm | 6 mm | 0.21 KG |
| N207 | 35 mm | 72 mm | 17 mm | 0.3 KG |
| N208 | 40 mm | 80 mm | 18 mm | 0.22 KG |
| N209 | 45 mm | 85 mm | 19 mm | 0.34 KG |
| N210 | 50 mm | 90 mm | 20 mm | 0.52 KG |
| N211 | 55 mm | 100 mm | 21 mm | 0.63 KG |
| N212 | 60 mm | 110 mm | 22 mm | 0.82 KG |
| N213 | 65 mm | 120 mm | 23 mm | 1.05 KG |
| N214 | 70 mm | 125 mm | 24 mm | 1.14 KG |
| N215 | 75 mm | 130 mm | 25 mm | 1.23 KG |
| N216 | 80 mm | 140 mm | 26 mm | 1.47 KG |
| N217 | 85 mm | 150 mm | 28 mm | 1.87 KG |
| N218 | 90 mm | 160 mm | 30 mm | 2.31 KG |
| N219 | 95 mm | 170 mm | 32 mm | 2.79 KG |
| N220 | 100 mm | 180 mm | 34 mm | 3.36 KG |
| N221 | 105 mm | 190 mm | 36 mm | 4 KG |
| N222 | 110 mm | 200 mm | 38 mm | 4.64 KG |
| N224 | 120 mm | 215 mm | 40 mm | 5.63 KG |
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