# Rex ZAS2211044078 Adapter Spherical Pillow Block Bearing 2-11/16" Bore 2000 Series Normal Duty Expansion - MROSupply.com ***Rex ZAS2211044078 2000 series normal duty adapter spherical pillow block bearing, 2-11/16 in bore, expansion cast iron two-bolt pillow block housing, single setscrew locking collar, clearance seal, increased internal clearance to C5, no grease, steel retainers, drilled auxiliary cap variant.*** ## Product details: - Catalog number: 10414429 - SKU: 857545 - Price: ***$2,936.82*** Each - Shipping: ***FREE SHIPPING*** ON ORDERS OVER $100 - Typically Ships in: 1 day - Brand: [Rexnord](https://www.mrosupply.com/brands/rexnord/) - Category: - [2-Bolt Pillow Block Bearings](htts://www.mrosupply.com/bearings/mounted-bearings/mounted-roller-bearings/pillow-block-bearings/2-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: 27.300 lb - UPC: 698210195939 - Technicall support: contact supplier for technical support on 800-626-2120 ## Product images: - https://static.mrosupply.com/images/noimage.webp ## Product attributes; - Ability to Relubricate: Yes - Available Seal Type: K Light Contact Lip Seal; M Spring Loaded Heavy Contact Lip Seal (Buna and Viton); Z Clearance Seal; G Triple Lip - Base Length (in): 10.44 - Base to centerline height (in): 3 1/4 in - Base to Centerline Height (in): 3 1/4 in - Base Width (in): 3.19 - Bearing Brand: REX ROLLER BEARING - Bolt Size (in): 2.6875 in - Bore length (in): 4 in - Bore Length (in): 4 in - Cage Material: Steel - Clearance: C5 INCREASED - Distance between bolt holes (in): 8 1/8 in - Distance Between Bolt Holes (in): 8 1/8 in - Distance from housing cast face to inner ring long hub face (in): 7/8 in - Distance from Housing Cast Face to Inner Ring Long Hub Face (in): 7/8 in - Expansion Capability (in): 0.38 - Expansion lock plug: B224408A - Expansion Lock Plug: B224408A - Fixed vs. Expansion: Expansion - Foot Height (in): 2 - Grease Fitting Thread Size: 1/8 NPT - Height: 10.56 - Housing Cast Face to Outermost Bearing Face (in): 0.88 - Housing coating: Powder coated - Housing Coating: POWDER COATED - Housing Color: Black - Housing construction: Solid - Housing Construction: Solid - Housing material: Cast iron - Housing Material: Cast Iron - Housing style: Pillow block - Housing Style: Pillow Block - Housing type: Pillow Block, Two Bolt - Housing Type: Pillow Block, Two Bolt - Inner Ring Outside Diameter (in): 3.37 - Insert: ZCS2211044078 - Length: 6.56 - Locking collar outside diameter (in): 4.06 - Locking device kit: SC9 - Locking Device Kit: SC9 - Locking Type: Single Set Collar - Lubrication type: Preservative only - no grease - Lubrication Type: PRESERVATIVE ONLY - NO GREASE - Maximum Speed (RPM): 2800 rpm - Maximum Temperature (C): 107 C - Maximum Temperature (F): 225 F - Microlock kit: NA - Microlock Kit: NA - Misalignment Capability: ±2.0° Misalignment - Dynamic - Misalignment Type: Dynamic - Mounting bolt hole slot length (in): 1 1/8 in - Mounting Bolt Hole Slot Length (in): 1 1/8 in - Mounting bolt size (in): 3/4 in - Mounting Bolt Size (in): 3/4 in - Mounting pad height (in): 2 in - Mounting Pad Height (in): 2 in - Mounting pad length (in): 10 7/16 in - Mounting Pad Length (in): 10 7/16 in - Mounting pad width (in): 3 3/16 in - Mounting Pad Width (in): 3 3/16 in - Net Weight: 27.30 - Overall Length (in): 10.44 - Overall width: 3.75 - Primary seal: Steel clearance seal - Primary Seal: STEEL CLEARANCE SEAL - Radial Dynamic Load Capacity (lb): 57750 lb - Radial Static Load Capacity (lb): 71500 lb - Retainer material: Steel - Retainer Material: Steel - Rolling element: Spherical Roller - Seal kit: ZS9 - Seal Kit: ZS9 - Seal type: Labyrinth Seal - Seal Type: Labyrinth Seal - Series: Solid-housed Pillow Blocks - Setscrew torque (in-lbs): 680 in/lbs - Setscrew Torque (in-lbs): 680 in/lbs - Size code: 9 - Size Code: 9 - Special lube percent: 0% fill - Special Lube Percent: 0% FILL - Unit of dimension: in - Unit of Dimension: IN - Vibration frequency fundamental train: 0.0072 cps - Vibration Frequency Fundamental Train: 0.0072 cps - Vibration frequency inner ring defect: 0.1701 cps - Vibration Frequency Inner Ring Defect: 0.1701 cps - Vibration frequency outer ring defect: 0.1299 cps - Vibration Frequency Outer Ring Defect: 0.1299 cps - Vibration frequency roller spin: 0.0591 cps - Vibration Frequency Roller Spin: 0.0591 cps - Volume: 1.275 - Volume unit: GLL - Volume Unit: GLL - Weight unit: LB - Width: 4.25 ## Product documents / software: - [Rex Mounted Roller Bearings Installation Instructions](https://documents.mrosupply.com/product_documents/23/63/2363892/6ddc7fe1403d4227d36d1cb21d07ffff0b45a555_lA7yTlb.pdf) - [Rex Mounted Roller Bearings Installation Instructions](https://documents.mrosupply.com/product_documents/85/76/857687/BR3-001_manual.pdf) - [Rexnord Bearings Catalog](https://documents.mrosupply.com/product_documents/58/93/5893723/5c878e5c94dc5c3d338a775129f99b4f092be791_xnS4NzU.pdf) - [Rexnord Bearings Catalog](https://documents.mrosupply.com/product_documents/85/80/858069/BR101-100EN_catalog.pdf) ## Alternate products to `Rex ZAS2211044078 Adapter Spherical Pillow Block Bearing 2-11/16" Bore 2000 Series Normal Duty Expansion - MROSupply.com`: - [Dodge 070353 P2B-S2-211LE two-bolt pillow block bearing with 2-11/16" bore, set screw locking, spherical roller insert, cast iron housing, expansion (float) design, labyrinth seal, and 3-1/4" shaft centerline height. Black oxide finish. Maximum speed 2040 rpm. Bolt centerline range 7-15/16" to 8-5/16". For heavy-duty applications requiring shaft float accommodation.](https://www.mrosupply.com/products/128925/as-markdown/) - [Link-Belt PEB22443H 10441431 2-bolt expansion pillow block spherical roller bearing, 2-11/16" bore, adapter sleeve mount, cast iron housing. Steel clearance seal, powder-coated housing, C0 standard clearance. For heavy-duty industrial applications requiring axial float.](https://www.mrosupply.com/products/495927/as-markdown/) ## Product's reviews: - Hydro coupler - Part went on beautifully! I'm very happy with purchase thank u - 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 - Great service-fast shipping - Awesome service. I would highly recommend doing business with MRO! Price was cheapest anywhere - Rexnord idler pulley - Great pricing and fast shipping A +++++++++ ## 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.