# SealMaster NP-39T 705390 2-Bolt Pillow Block Bearing 2-7/16" Bore Concentric Lock Gold Line - MROSupply.com ***SealMaster NP-39T 705390 2-7/16" bore 2-bolt pillow block bearing unit, Gold Line. Cast iron housing with solid base, 52100 bearing steel insert, black oxide coating, concentric SKWEZLOC lock, and standard felt-labyrinth seal. Pre-lubricated for general industrial applications.*** ## Product details: - Catalog number: 705390 - SKU: 2255010 - Price: ***$347.07*** Each - Shipping: ***FREE SHIPPING*** ON ORDERS OVER $100 - Typically Ships in: 1 day - Brand: [SealMaster](https://www.mrosupply.com/brands/sealmaster/) - Category: - [2-Bolt Pillow Block Bearings](htts://www.mrosupply.com/bearings/mounted-bearings/mounted-ball-bearings/pillow-block-bearings/2-bolt-pillow-block-bearings/) - [Pillow Block Bearings](htts://www.mrosupply.com/bearings/mounted-bearings/mounted-ball-bearings/pillow-block-bearings/) - [Mounted Ball Bearings](htts://www.mrosupply.com/bearings/mounted-bearings/mounted-ball-bearings/) - [Mounted Bearings](htts://www.mrosupply.com/bearings/mounted-bearings/) - [Bearings](htts://www.mrosupply.com/bearings/) - Unit of measure: each - Weight: 14.500 lb - UPC: 662461029800 - 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 - Base Length (in): 9.5 - Base to Center Height (in): 2.75 - Base Width (in): 2.75 - Bearing Insert Finish: Black Oxide - Bearing Insert Material: 52100 Bearing Steel - Bearing Type: Standard Duty - Bolt Size (in): 5/8 - Bolt Spacing Max (in): 7.63 - Bolt Spacing Min (in): 6.88 - Bore Diameter (in): 2.4375 - Bore Shape: Straight - Cage Material: PPS - Polyphenylene Sulfide - Cage Type: Land Riding Retainer - Centerline to Outermost Bearing Face (in): 1.63 - Dynamic Load Rating (lb): 11789 - End Cap: No - Fixed vs. Expansion: Fixed - Foot Height (in): 0.88 - Grease Fitting Thread Size: 1/8 NPT - Height: 3 - Housing: Pillow Block, Two Bolt - Housing Base: Solid - Housing Coating: Powder Coated - Housing Color: Black - Housing Construction: One Piece - Housing Material: Cast Iron - Housing Style: Pillow Block - Inner Race Heat Treat Method: Zone-Hardened - Inner Ring OD (in): 2.984 - Insert: 2-27T - Length: 10.38 - Length Through Bore (in): 2.63 - Locking Collar Outside Diameter (in): 4.22 - Lubricant: Lithium Complex NLGI 2 Grease - Max Operating Temperature (F): 220 - Maximum Speed (RPM): 4100 - Misalignment Capability: ±2.0° Misalignment - Static Only - Misalignment Type: Static Only - Outer Ring Land Profile: Standard - Overall Height (in): 5.56 - Overall Length (in): 9.5 - Overall Width (in): 2.75 - Radial Clearance: Standard - Rolling element: Ball Bearing - Seal: Felt Labyrinth Seal - Setscrew Torque (in-lbs): 495 - Shaft Locking Type: Concentric - Size Code: 2-27 - Static Load Rating (lb): 8150 - Vibration Frequency Fundamental Train: 0.007 - Vibration Frequency Inner Ring Defect: 0.099 - Vibration Frequency Outer Ring Defect: 0.068 - Vibration Frequency Roller Spin: 0.043 - Width: 6.5 ## Product documents / software: - [Catalog Page](https://documents.mrosupply.com/product_documents/NP/NP-12T/MCC12004E_G32.pdf) - [Drawing](https://documents.mrosupply.com/product_documents/NP/NP-12T/NP-T.GIF) - [3D Drawing IGES](https://documents.mrosupply.com/product_documents/NP/NP-39T%20HT/regalpts_beloit_EMERSON-NP-39T-DEFAULT_HR9RzsT.IGS) ## Alternate products to `SealMaster NP-39T 705390 2-Bolt Pillow Block Bearing 2-7/16" Bore Concentric Lock Gold Line - MROSupply.com`: - [Dodge 123822 P2B-SC-207 two-bolt pillow block bearing with 2-7/16" bore, 65-degree set screw locking, normal duty cast iron housing, 212 series, non-expansion design with DualGuard seals for general industrial applications.](https://www.mrosupply.com/products/131709/as-markdown/) - [SealMaster NP-35 700200 2-3/16" bore 2-bolt pillow block bearing, Gold Line. Cast iron housing with 52100 bearing steel insert, black oxide coating, set screw lock, and labyrinth seal. Pre-lubricated for general industrial applications.](https://www.mrosupply.com/products/421923/as-markdown/) - [Browning VPLE-216 767363 2-bolt pillow block mounted ball bearing with a 1-inch bore and eccentric locking collar. The cast iron low-base extended housing supports a 52100 bearing steel insert with a black oxide coated inner ring, single lip contact seal, and flinger. Suitable for conveyor head shafts, fan supports, and general industrial machinery.](https://www.mrosupply.com/products/2272137/as-markdown/) - [Dodge 128451 P2B-DLAH-207 two-bolt pillow block ball bearing with 2-7/16" bore, D-Lok concentric collar locking, cast iron housing, standard duty rating, non-expansion design for air handling applications. Single-lip seal with flingers, powder coated finish, relubrication enabled, maximum 3500 rpm.](https://www.mrosupply.com/products/130903/as-markdown/) - [Dodge 123914 P2B-SCAH-207 two-bolt pillow block bearing with 2-7/16" bore, 65° set screw locking, standard duty cast iron housing, single-lip seal with flingers, 212 series insert, 3500 RPM max speed, air handling application. Non-expansion fixed bearing for shaft positioning. Powder coated finish for corrosion resistance. Relubrication enabled.](https://www.mrosupply.com/products/123397/as-markdown/) - [SealMaster NP-39 700204 2-7/16" bore 2-bolt pillow block bearing, Gold Line. Cast iron housing with solid base, 52100 bearing steel insert, black oxide coating, setscrew locking, and standard felt labyrinth seal. Pre-lubricated for general industrial applications.](https://www.mrosupply.com/products/2255703/as-markdown/) - [Browning VPS-239 767994 2-bolt pillow block mounted ball bearing with a 2-7/16-inch bore and set screw locking. The cast iron housing supports a relubricable single-row deep-groove ball bearing insert with a black oxide coated inner ring, single lip contact seal, and flinger. Suitable for conveyor head shafts, fan supports, blower drives, and general industrial machinery.](https://www.mrosupply.com/products/2272240/as-markdown/) - [Dodge 131821 P2B-SXR-207 two-bolt pillow block bearing with 2-7/16" bore, eccentric collar locking, standard duty cast iron housing, and 212 series ball bearing insert. DualGuard seals with flingers provide reliable protection in general-purpose applications. Non-expansion design for fixed mounting, rated up to 3500 rpm, with relubrication capability.](https://www.mrosupply.com/products/131410/as-markdown/) ## Product's reviews: - Excelent - excelent - Bearing - It was delivered on time - Drum bearing - Very easy to order, arrived very quickly, We will be ordering more items from here in the future. - Response - Very knowledgeable sales rep. Excellent delivery time. Very important when supply chains are challenging. ## 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.