# Rex MBR5303 Round Flange Cartridge Bracket 3-3/16" Bore 80.96 mm Heavy Duty Spherical Roller Bearing - MROSupply.com ***Rex MBR5303 5000 series heavy duty round flange cartridge bracket for mounted spherical roller bearings, 3-3/16 in (80.96 mm) bore, cast iron housing, double setscrew locking collar, spring-loaded heavy contact lip seal.*** ## Product details: - Catalog number: 10407856 - SKU: 504348 - Price: ***$2,215.04*** Each - Shipping: ***FREE SHIPPING*** ON ORDERS OVER $100 - Typically Ships in: 1 day - Brand: [Rexnord](https://www.mrosupply.com/brands/rexnord/) - Category: - [4-Bolt Flange](htts://www.mrosupply.com/bearings/mounted-bearings/mounted-roller-bearings/flanged-mounted-bearings/4-bolt-flange/) - [Flanged Mounted Bearings](htts://www.mrosupply.com/bearings/mounted-bearings/mounted-roller-bearings/flanged-mounted-bearings/) - [Mounted Roller Bearings](htts://www.mrosupply.com/bearings/mounted-bearings/mounted-roller-bearings/) - [Mounted Bearings](htts://www.mrosupply.com/bearings/mounted-bearings/) - [Bearings](htts://www.mrosupply.com/bearings/) - Unit of measure: each - Weight: 38.000 lb - UPC: 698210701505 - Technicall support: contact supplier for technical support on 800-626-2120 ## Product images: - https://static.mrosupply.com/images/noimage.webp ## Product attributes; - Available end cap: DTC10 - Available End Cap: DTC10 - Available Seal Type: K Light Contact Lip Seal; M Spring Loaded Heavy Contact Lip Seal (Buna and Viton); Z Clearance Seal; G Triple Lip - Bearing Brand: REX ROLLER BEARING - Bolt circle radius (in): 4 5/16 in - Bolt Circle Radius (in): 4 5/16 in - Bolt hole circle diameter (in): 8 5/8 in - Bolt Hole Circle Diameter (in): 8 5/8 in - Bolt Size (in): 3.1875 in - Bore length (in): 5 5/16 in - Bore Length (in): 5 5/16 in - Bore size (in): 3.1875 in - Bore Size (in): 3.1875 in - Cage Material: Engineered Polymer - Clearance: C3 STANDARD - Distance between bolt holes (in): 6 3/32 in - Distance Between Bolt Holes (in): 6 3/32 in - Distance from housing cast face to inner ring long hub face (in): 15/16 in - Distance from Housing Cast Face to Inner Ring Long Hub Face (in): 15/16 in - Distance from mounting surface to end of pilot end (in): 2 15/16 in - Distance from Mounting Surface to End of Pilot End (in): 2 15/16 in - Distance from mounting surface to outer most bearing face (in): 2 3/8 in - Distance from Mounting Surface to Outer Most Bearing Face (in): 2 3/8 in - Fixed vs. Expansion: Fixed - Foot Height (in): 0.94 - Grease Fitting Thread Size: 1/8 NPT - Height: 11.25 - Housing Cast Face to Outermost Bearing Face (in): 0.94 - Housing coating: Powder coated - Housing Coating: POWDER COATED - Housing construction: Solid - Housing Construction: Solid - Housing material: Cast iron - Housing Material: Cast Iron - Housing style: Flange block - Housing Style: Flange Block - Housing type: Flange, Cartridge - Housing Type: Flange, Cartridge - Insert: 5303U - Length: 11.50 - Length Through Bore (in): 5.31 - Locking collar outside diameter (in): 4 29/32 in - Locking Collar Outside Diameter (in): 4 29/32 in - Locking device kit: SC10 QTY 2 - Locking Device Kit: SC10 QTY 2 - Locking Type: Double Set Collar - Lubrication type: EXXON RONEX MP STD - Lubrication Type: EXXON RONEX MP STD - Maximum Speed (RPM): 1400 rpm - Maximum Temperature (C): 107 C - Maximum Temperature (F): 225 F - Microlock kit: ML4 - Microlock Kit: ML4 - Mounting bolt size (in): 3/4 in - Mounting Bolt Size (in): 3/4 in - Mounting pad height (in): 15/16 in - Mounting Pad Height (in): 15/16 in - Mounting Surface to End of Housing (in): 2.94 - Net Weight: 38.00 - Pilot depth (in): 1 1/4 in - Pilot Depth (in): 1 1/4 in - Pilot diameter (in): 7.375 in - Pilot Diameter (in): 7.375 in - Primary seal: Buna spring loaded lip seal - Primary Seal: BUNA SPRING LOADED LIP SEAL - Radial Dynamic Load Capacity (lb): 84330 lb - Radial Static Load Capacity (lb): 90700 lb - Retainer material: Engineered Polymer - Retainer Material: Engineered Polymer - Seal kit: MS10 - Seal Kit: MS10 - Seal type: Heavy Contact Seal - Seal Type: Heavy Contact Seal - Series: Flanged Cartridge Blocks - Setscrew torque (in-lbs): 680 in/lbs - Setscrew Torque (in-lbs): 680 in/lbs - Size code: 10 - Size Code: 10 - Unit of dimension: in - Unit of Dimension: IN - Vibration frequency fundamental train: 0.0073 cps - Vibration Frequency Fundamental Train: 0.0073 cps - Vibration frequency inner ring defect: 0.1784 cps - Vibration Frequency Inner Ring Defect: 0.1784 cps - Vibration frequency outer ring defect: 0.1383 cps - Vibration Frequency Outer Ring Defect: 0.1383 cps - Vibration frequency roller spin: 0.0628 cps - Vibration Frequency Roller Spin: 0.0628 cps - Volume: 3.36 - Volume unit: GLL - Volume Unit: GLL - Weight unit: LB - Width: 6.00 ## Product documents / software: - [Rex 2000, 3000, 5000, 9000 Series Roller Bearings](https://documents.mrosupply.com/product_documents/BM/BMT52111/000-Series-Roller-Bearings_Installation-Manual_PK8BJAF.pdf) ## Product's reviews: - Parts ordered - We were very happy with the parts we ordered. - Good orice - This stump grinder wheel bearing is expensive and I need two each time I change them. Best price I found anywhere and free shipping here at MRO Supply - Jose - Really good customer service - A ok - Quick and correct. These days that is asking a lot. ## FAQ: - How do I choose the right type of bearing for my application?: Start with the load and how it’s applied. You need to know if you’re dealing with radial loads, axial loads, or a mix of both. Then look at speed, operating environment, and space constraints. For example, ball bearings are great for high speed and lighter loads, while roller bearings handle heavier loads but usually at lower speeds. If there’s contamination, moisture, or heat involved, you may need sealed bearings or specific materials. In most cases, the right choice comes down to matching load type, speed, and environment to the bearing design.