# Dodge 077293 P4B-EXL-307RE Four-Bolt Pillow Block Bearing 3-7/16" Bore Set Screw - MROSupply.com ***Dodge 077293 P4B-EXL-307RE heavy-duty four-bolt pillow block bearing with 3-7/16" bore, EXL tapered roller insert, and Trident triple-lip seal. Set screw locking, expansion (float) capability for thermal shaft growth, cast iron housing, uncoated finish, 1640 rpm maximum speed.*** ## Product details: - Catalog number: 077293 - SKU: 1291208 - Price: ***$1,525.55*** Each - Shipping: ***FREE SHIPPING*** ON ORDERS OVER $100 - Typically Ships in: 1 day - Brand: [Dodge](https://www.mrosupply.com/brands/dodge/) - Category: - [4-Bolt Pillow Block Bearings](htts://www.mrosupply.com/bearings/mounted-bearings/mounted-roller-bearings/pillow-block-bearings/4-bolt-pillow-block-bearings/) - [Pillow Block Bearings](htts://www.mrosupply.com/bearings/mounted-bearings/mounted-roller-bearings/pillow-block-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: 73.000 lb - Technicall support: contact supplier for technical support on +1-864-284-5700 ## Product images: - https://static.mrosupply.com/images/noimage.webp ## Product attributes; - Base to center height: 3.7500 in, 95.25 mm - Bearing type: Tapered roller, tapered roller - Bolt Diameter: 0.7500 in - Bolt to bolt max: 11.7500 in, 298.45 mm - Bolt to bolt min: 10.5600 in, 268.224 mm - Bolt width: 2.3800 in, 60.452 mm - Bore length: 5.0000 in, 127.0 mm - Expansion capability: Expansion (float) - Finish: Uncoated - Greasable: Yes - Housing construction: Split - Housing material: Ductile Iron - Housing type: Four-bolt pillow block - I.D.: 3 7/16 in - Insert material: Steel - Locking: Set screw - Lubrication type: Grease - Material: Cast iron - Max RPM: 1640 RPM - Max Speed: 1640 RPM - Rolling element: Tapered roller - Seal: Trident triple-lip - Sensor ready: Yes - Shaft attachment: Setscrew - Shaft diameter: 3.4375 in - Static load capacity: 108600 lbf, 483076.867 N - Take-up frame size: HD-350,TS-400 ## Product documents / software: - [2D DXF front](https://documents.mrosupply.com/product_documents/07/077293/baldor2d_077293_front_dUrNhNI.dxf) - [2D DXF right](https://documents.mrosupply.com/product_documents/07/077293/baldor2d_077293_right_Bm5JBxy.dxf) - [2D DXF top](https://documents.mrosupply.com/product_documents/07/077293/baldor2d_077293_top_FgmT3fj.dxf) - [3D DXF](https://documents.mrosupply.com/product_documents/07/077293/baldor3d_077293_FKgYlZy.dxf) - [3D DXF](https://documents.mrosupply.com/product_documents/07/077293/baldor3d_077293_yKknrHh.dxf) ## Suggested products: - [Dodge 089036 HD-350X30-TUFR heavy-duty take-up bearing frame, carbon steel construction with standard paint finish, designed for mounting Dodge take-up bearings and providing reliable belt tensioning in industrial conveyor applications.](https://www.mrosupply.com/products/124989/as-markdown/) - [Dodge 089154 HD-350X12-TUFR heavy-duty take-up bearing frame with 12-inch travel, designed for belt and chain tensioning in industrial conveyor systems. Rugged cast iron construction provides reliable support for mounted bearings in demanding applications. Pre-engineered capacity exceeds bearing load ratings for extended service life.](https://www.mrosupply.com/products/132237/as-markdown/) - [Dodge 066273 P2B-SD-308E two-bolt pillow block bearing with 3-7/16" bore, tapered roller insert, clamp collar locking, cast iron housing, expansion (float) design, piston ring seal, black oxide finish, 1510 rpm maximum speed, for heavy-duty industrial applications.](https://www.mrosupply.com/products/123050/as-markdown/) - [Dodge 089037 HD-350X36-TUFR heavy-duty take-up bearing frame with 3.5" travel and 36" overall length. Cast iron construction for industrial belt tensioning applications.](https://www.mrosupply.com/products/124991/as-markdown/) - [Dodge 089035 HD-350X24-TUFR take-up bearing frame for belt and chain tensioning applications. Pre-engineered capacity exceeds bearing limits with standard travel adjustment. Light duty construction suitable for industrial conveyor and power transmission systems.](https://www.mrosupply.com/products/132239/as-markdown/) ## Product's reviews: - Great - Good price and excellent delivery - Txt4 parts order - The staff was very helpful identifying the part I needed. - Great! - Cheapest price I've found on the web. - Quick and correct - As expected ## 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. - What is a bearing and what does it do?: A bearing is a mechanical component that enables smooth rotational or linear motion by reducing friction between moving parts. Bearings support loads and facilitate the transfer of forces between moving elements, preventing direct metal-to-metal contact that would cause wear and heat buildup. Rolling element bearings contain balls or rollers that rotate within races (raceways) to minimize friction. Common types include ball bearings (used for moderate loads and high speeds), roller bearings (used for heavy loads at medium speeds), and angular contact bearings (designed for combined radial and axial loads). Bearings are essential in industrial equipment including motors, pumps, compressors, gearboxes, turbines, and conveyor systems. - How do I choose the right bearing for my application?: Bearing selection depends on five key factors: 1. Load Type and Direction — Determine whether your application has radial loads (perpendicular to shaft), axial loads (along the shaft), or combined loads. Deep groove ball bearings suit primarily radial loads; tapered roller bearings excel at combined loads; thrust bearings handle pure axial forces. 2. Rotational Speed — Ball bearings support higher speeds with lower friction. Roller bearings are better for medium-speed, heavy-load applications. Verify bearing speed ratings against your operating RPM. 3. Load Capacity — Select a bearing with adequate load capacity for your application. Basic dynamic load rating (C) and basic static load rating (C₀) determine how much load the bearing can safely carry. 4. Lubrication Requirements — Choose between grease and oil lubrication based on speed, temperature, and load. High-speed or high-temperature applications typically require oil circulation; lower-speed applications can use grease. 5. Precision and Rigidity — Evaluate your application's tolerance for runout deviation. High-precision applications require tighter tolerances and higher-grade bearings. - What bearing materials are available and which should I use?: Standard bearing materials include: - Chrome Steel — Premium bearing steel used by SKF, NSK, Timken, and most manufacturers. Offers excellent hardness, fatigue resistance, and durability in standard industrial applications. Most common for ball and roller bearings. - Stainless Steel — Provides corrosion resistance for applications in wet, humid, or chemically corrosive environments. Used in food processing, marine, and pharmaceutical equipment. - Ceramic Hybrid Bearings — Combine steel races with ceramic rolling elements. Offer reduced friction, lower heat generation, and higher temperature capability. Used in high-speed, high-precision applications and aerospace. - Polymeric Bearings — Utilize fluoropolymer composites with embedded graphite or PTFE. Provide low friction in high-speed applications where lubrication film breakdown would be problematic. Material selection depends on operating environment (temperature, moisture, chemical exposure), speed, load, and precision requirements. Standard chrome steel bearings suit most industrial MRO applications. - What are dynamic and static load ratings, and why do they matter?: Static Load Rating (C₀) — The maximum load a stationary or slowly rotating bearing can support without permanent deformation of its rolling elements or raceways. Defined by ISO 76 as the load producing 0.01% permanent deformation of the rolling element diameter. Static load capacity is the limiting factor when a bearing operates at very low speeds or remains stationary under heavy loads. Dynamic Load Rating (C) — The constant load a bearing can endure for a specified number of revolutions (the L10 life, at which 90% of identical bearings are expected to survive). Dynamic load rating determines how long a bearing will last under rotating or oscillating motion. ISO 281 defines the L10 calculation using the formula: L10 = (C/P)^p, where C is dynamic load rating, P is equivalent dynamic load, and p is the life exponent (3 for ball bearings, 10/3 for roller bearings). Why They Matter — Static load rating determines if a bearing can handle peak loads without permanent damage (even if not rotating). Dynamic load rating determines operational life. For high-speed applications, dynamic rating is critical. For low-speed or stationary loads, static rating may be the limiting factor. Always verify both ratings against your application's load profile. - What is bearing life (L10) and how does it affect my equipment maintenance?: L10 Life Definition (ISO 281) — L10 is the basic rating life at which 90% of a large group of identical bearings are statistically expected to survive under constant load and speed. It is calculated in millions of revolutions using the formula: L10 = (C/P)^p, where C is the basic dynamic load rating, P is the equivalent dynamic bearing load, and p is the life exponent (3 for ball bearings). Converting L10 to Operating Hours — To express L10 life in hours: L10h = (L10 × 10^6) / (60 × n), where n is rotational speed in RPM. For example, a bearing with L10 = 1,000 million revolutions operating at 3,600 RPM has approximately L10h ≈ 4,630 hours. Modified Life (L10a) — Actual bearing life also depends on lubrication quality, contamination, speed, temperature, and bearing accuracy. ISO 281 defines a modified life factor (a₁ × aISO) that adjusts the theoretical L10 for these real-world conditions. High-quality lubrication and proper maintenance can extend bearing life significantly; poor lubrication or high contamination reduces it. Why It Matters for Maintenance — L10 life helps you schedule preventive maintenance, budget for bearing replacement, and select bearings adequate for your duty cycle. - How should I maintain and lubricate bearings?: Lubrication Importance — Improper lubrication causes over 40% of bearing failures. Proper bearing lubrication prevents friction damage, dissipates heat, protects against corrosion, and acts as a barrier against contaminants (dust, moisture, debris). Lubrication Selection — Choose between grease and oil based on: - Grease: Suitable for low-to-medium speed, sealed bearings, and applications without continuous circulation. Easier to apply and retain. Common for motors, household appliances, and sealed units. - Oil Mist or Circulating Systems: Better for high-speed applications, high-temperature environments, and heavy-load machinery where heat dissipation is critical. Best Practices: 1. Map all lubrication points and create a maintenance schedule. 2. Use the correct lubricant type and viscosity grade specified by the bearing manufacturer. 3. Store lubricants in sealed, labeled containers away from moisture and contaminants. 4. Monitor bearing temperature and vibration; unusual heat or noise may indicate inadequate lubrication or bearing wear. 5. Replace bearings before reaching L10 life if contamination or lubrication failure is detected.