# SealMaster SF-32 Mounted Ball Bearings | MROSupply.com - MROSupply.com ***SealMaster SF-32 2" Mounted Ball Bearing, Cast Iron Four Bolt Flange, 52100 Bearing Steel, Black Oxide Coated, Setscrew Lock, Felt Labyrinth Seal*** ## Product details: - Catalog number: 700458 - SKU: 421683 - Price: ***$238.63*** Each - Shipping: ***FREE SHIPPING*** ON ORDERS OVER $100 - Typically Ships in: 1 day - Brand: [SealMaster](https://www.mrosupply.com/brands/sealmaster/) - Category: - [4-Bolt Flange](htts://www.mrosupply.com/bearings/mounted-bearings/mounted-ball-bearings/flanged-mounted-bearings/4-bolt-flange/) - [Flanged Mounted Bearings](htts://www.mrosupply.com/bearings/mounted-bearings/mounted-ball-bearings/flanged-mounted-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: 10.370 lb - UPC: 662461003602 - Technicall support: contact supplier for technical support on 800-626-2120 ## Product images: - https://static.mrosupply.com/images/noimage.webp ## Product attributes; - Bearing Insert Finish: Black Oxide - Bearing Type: Standard Duty - Bolt Size (in): 5/8 - Bolt Spacing (in): 5.125 - Bore: 2 in - Bore Shape: Straight - Cage Material: PPS - Polyphenylene Sulfide - Cage Type: Land Riding Retainer - Dynamic Load Rating (lb): 9752 - End Cap: No - Fixed vs. Expansion: Fixed - Foot Height (in): 0.81 - Grease Fitting Thread Size: 1/8 NPT - Height: 2.44 - Housing Backside Inner Diameter: 4.25 - Housing Coating: Powder Coated - Housing Color: Black - Housing Construction: One Piece - Housing material: Cast iron - Housing Style: Flange Block - Inner Race Heat Treat Method: Zone-Hardened - Inner Ring OD (in): 2.723 - Insert: 2-2 - Insert Material: Bearing steel - Length: 6.75 - Length Through Bore (in): 2.184 - Locking: Set screw - Lubricant: Lithium Complex NLGI 2 Grease - Max Operating Temperature (F): 220 - Maximum Speed (RPM): 3250 - Misalignment Capability: ±2.0° Misalignment - Static Only - Misalignment Type: Static Only - Outer Ring Land Profile: Standard - Overall Height (in): 2.313 - Overall Length (in): 6.38 - Overall Width (in): 6.38 - Pilot Configuration: No Pilot - Radial Clearance: Standard - Relubrication: Yes - Rolling element: Ball Bearing - Seal: Felt Labyrinth Seal - Size Code: 2-23 - Static Load Rating (lb): 6601 - Width: 6.5 ## Product documents / software: - [Catalog Page](https://documents.mrosupply.com/product_documents/SF/SF-16%20C/MCC12004E_G49_Ve9C8Fj.pdf) - [3D Drawing IGES](https://documents.mrosupply.com/product_documents/SF/SF-32/regalpts_beloit_EPTCAD-SF-32-DEFAULT_Wq7T7Yv.IGS) ## Alternate products to `SealMaster SF-32 Mounted Ball Bearings | MROSupply.com - MROSupply.com`: - [Dodge 126815 P2B-SCM-200 Bore Diameter: 2 Inch Housing: Pillow Block Locking: Set Screw](https://www.mrosupply.com/products/131801/as-markdown/) - [Dodge 131343 F4B-SXR-200L Bore Diameter: 2 Inch Housing: 4-Bolt Flange Locking: Eccentric Collar](https://www.mrosupply.com/products/129353/as-markdown/) - [Browning VF4E-232 INTERCHANGE GENERAL UNIT](https://www.mrosupply.com/products/2272052/as-markdown/) - [Browning VF4E-231 INTERCHANGE GENERAL UNIT](https://www.mrosupply.com/products/2272051/as-markdown/) - [Link-Belt (Rexnord) F3Y232N 10424023 2 FLANGE BALL BEARING](https://www.mrosupply.com/products/492405/as-markdown/) - [Browning VF4S-232 INTERCHANGE GENERAL UNIT](https://www.mrosupply.com/products/2272087/as-markdown/) - [DODGE 126847 P2B-SCMAH-200 2 BORE](https://www.mrosupply.com/products/123626/as-markdown/) - [Browning T65LX2 Torque Limiters](https://www.mrosupply.com/products/2284277/as-markdown/) ## Product's reviews: - 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. - Bearing - It was delivered on time - Owner - Your shipment was quick and you have a great price on Sealmaster bearings. Your Gates and Browning Power Belts were higher than I expected. Great Service Great Price. We have to get right or get left in this market in this market. ## FAQ: - How do I read a SealMaster mounted ball bearing part number like NP-16 or SFT-23?: The letters give the housing and the number gives the bore. On inch units the dash number is the bore in sixteenths of an inch: NP-16 is 1", NP-23 is 1-7/16", MP-39 is 2-7/16". Metric units use a three-digit code: NP-204 is a 20 mm standard-duty unit and MP-305 is a 25 mm medium-duty unit. Common housings: NP standard-duty pillow block, MP medium-duty pillow block, SFT two-bolt flange, SF four-bolt flange, SFC four-bolt piloted flange, FB three-bolt flange, ST take-up, SC cylindrical cartridge. A T after the number (NP-16T) means a SKWEZLOC concentric collar instead of setscrews. - What is the difference between a SealMaster NP-16 and an NP-16T?: Both are 1" standard-duty Gold pillow blocks; the difference is how the insert locks to the shaft. NP-16 uses setscrews: tighten the first screw to half the catalog torque, the second to full, then the first to full. NP-16T uses the SKWEZLOC concentric locking collar, clamped by a single cap screw: seat the collar square and snug against the inner ring shoulder, then torque the screw (for example 100 in-lb on a #10-24 with a T-27 Torx, 240 in-lb on a 1/4-20 with a T-30). The inserts differ too (2-1 versus 2-1T), so order the replacement insert that matches the lock type. - Why is there a SealMaster NP-20 and an NP-20R if both have a 1-1/4" bore?: The R unit puts a 1-1/4" bore in the smaller frame. In the NP series catalog table, NP-20R uses insert 1-14 and sits in the same housing size group as the 1-1/16" to 1-3/16" units (dynamic rating 4, 381 lb), while NP-20 uses insert 2-14 in the larger frame shared with the 1-5/16" to 1-7/16" units (5, 782 lb). SealMaster uses the R suffix the same way across all sizes and housings. The two are not dimensionally interchangeable, so check shaft height and bolt spacing on the old unit before ordering, and match the insert number when replacing just the bearing. - Can I replace just the insert in a SealMaster mounted ball bearing, and which insert fits?: Yes. Pillow block and flange units use spherical OD inserts whose number is listed for each unit (NP-16 takes a 2-1, MP-16 a 3-1). ER inserts have a cylindrical OD for cylindrical-bore housings and are relubricated through a groove in the outer ring. SealMaster says replacement inserts are meant for SealMaster housings. Inspect the housing seat first: swing the insert in through the load slot, line up the dimple and lube hole with the housing grease port, fit the locking pin, then snug the grease fitting and back it off 1/4 turn. If the insert swivels by hand, or needs heavy force, replace the complete unit. - What grease is in a SealMaster Gold ball bearing and how much do I add when relubricating?: Standard Gold ball bearings (NP, MP, SF, SFT and similar) ship ready to run with a lithium complex grease, EP additive, mineral oil base, NLGI grade 2; relubricate with a compatible lithium complex NLGI 2 grease. The catalog charge is small: about 0.04 oz for a standard-duty 13/16" to 1" bore, 0.22 oz for 1-13/16" to 2", and 0.62 oz for 2-13/16" to 2-15/16". Grease while rotating until purge shows at the seals, or add half, run a few minutes, then add the rest. Run below 200F and never above 250F. PN Gold washdown units ship with food-grade calcium sulfonate grease, and HT, HI, RM, LO and XLO units have their own fills, so check the fitting cap color first. - What do the colored grease fitting caps on SealMaster bearings mean, and can I grease an RM bearing?: SealMaster color-codes the fitting cap to show the factory grease. Yellow: lithium complex, NLGI 2, ISO 100 to 220 oil. Red: high-temperature lithium complex with ISO 220 synthetic oil. White: H1 food-grade calcium sulfonate, ISO 100 oil. Black: a non-standard grease. No cap: a non-standard high-temperature grease. Match the cap color when you relubricate, because mixing incompatible greases shortens life. Units with the RM suffix (for example NP-16 RM) are reduced-maintenance bearings designed to run on the factory fill and are not meant to be relubricated. - Which SealMaster ball bearing suffixes are for high temperature or low torque (HT, HTA, HI, LO, XLO)?: Standard Gold units are rated -20F to 220F. The HT, HTC and HTA suffixes are high-temperature modifications, all rated to 400F; relubricate them with a high-temperature lithium complex grease with ISO 220 synthetic oil. HI-suffix units use Krytox GPL-226, with no substitutes. LO and XLO units are built to run with less torque or drag than a standard bearing; any grease added increases drag, so add only a very small amount and check the shaft still turns freely enough for the application. - What is different about SealMaster PN Gold bearings (CRPS-PN, CRFTS-PN, ERX-PN) for washdown areas?: PN Gold inserts are 52100 steel with a high phosphorus electroless nickel plating, and the CRFTS-PN flanges use 316 passivated stainless housings with an HPS seal, rated -20F to 220F. SealMaster rates PN Gold and SS Gold products IP69K for washdown. They ship with a food-grade calcium sulfonate grease, so relubricate with a compatible calcium sulfonate NLGI 2. PN Gold takes lower setscrew torques than CR Gold (35 to 45 in-lb on a 1/4-28 screw versus 65 to 85) and has lower speed limits (3, 100 rpm versus 6, 450 rpm at 1/2" to 3/4" bore). Open and closed end caps and backside shields are sold separately and are not offered for every size. - Can I replace a 2-bolt flange mounting with a 4-bolt flange?: Not directly without frame modification, as 4-bolt and 2-bolt flanges have different hole patterns and mounting footprints. However, 4-bolt flanges can be retrofitted into existing installations if the mounting surface is enlarged to accommodate the wider square flange pattern. - What defines a 4-bolt flange mounting pattern?: A 4-bolt flange has four mounting holes arranged in a square pattern on the housing perimeter, with hole center distances varying from 70mm to 350mm depending on bearing size. This configuration provides superior load distribution compared to 2-bolt designs and is the North American standard for medium-to-heavy duty applications. - Are 4-bolt flanges sealed against contamination?: Yes, 4-bolt flange units typically feature factory-installed labyrinth seals that exclude contaminants while allowing self-ventilation. These seals prevent lubricant leakage and maintain seal performance across standard operating temperatures up to 250°F, with high-temperature variants rated to 350°F. - What bore sizes are available for 4-bolt flanges?: 4-bolt flange bearing units cover metric bore sizes from 12mm to 140mm (common sizes: 20, 25, 30, 35, 40, 50, 60, 75, 80, 100mm) and inch-series shafts up to 4.5 inches. Bore selection depends on shaft diameter requirements for your application. - What are typical dynamic and static load ratings for 4-bolt flanges?: Load ratings range from 7.35 kN dynamic / 4.78 kN static for small bore units to 212 kN dynamic / 272 kN static for larger sizes. Tapered roller bearing 4-bolt units typically deliver higher load capacity and longer bearing life compared to equivalent ball bearing units. - What mounting surface requirements must I meet for proper flange installation?: The mounting surface must be flat and stable to prevent angular, axial, or parallel misalignment that can cause edge loads and premature bearing failure. Confirm that your housing face is clean and flat within tolerance, and that all bolt holes align correctly before installation. - What critical dimensions do I need to know to select the right flanged mounted bearing?: You need to verify four key dimensions: bore diameter (the shaft size), outer diameter (housing bore fit), bearing width, and flange outer diameter and thickness. These specifications ensure proper load distribution and prevent slipping or misalignment during operation. - Can flanged mounted bearings handle both radial and axial loads?: Most flanged mounted bearings are designed to absorb high radial loads, while some units can handle moderate axial loads in both directions. Check the manufacturer datasheet for your specific bearing model to confirm dynamic and static load ratings before final selection. - What is the main advantage of a flanged mounted bearing over a standard bearing?: Flanged mounted bearings have an integrated mounting flange that acts as a built-in retaining surface, eliminating the need for separate brackets, adapters, or machining. The flange provides precise axial positioning and simplifies installation by allowing you to bolt directly to your housing surface, reducing assembly time and cost. - Do flanged mounted bearings require periodic maintenance like standard bearings?: Many flanged mounted bearings come with permanent grease lubrication sealed for life, eliminating the need for re-greasing during operation. However, some designs may require periodic relubrication depending on operating conditions, so always verify the maintenance requirements with your bearing's technical documentation. - What are the main types of mounted bearings?: Mounted bearings come in four main forms: pillow blocks (flat-base, shaft parallel to mounting surface), flange mounts (perpendicular shaft, available in 2-bolt and 4-bolt variants with different radial ratings), hanger bearings (overhead support for long horizontal shafts), and take-up frames (adjustable center-distance units for belt or chain drive tensioning). Select based on your shaft orientation, load direction, and space constraints. - When should I replace a mounted bearing?: Replace based on condition: vibration signature analysis or ultrasonic emission (detected with a hand-held meter) indicates wear hours or days before audible noise appears, and is the actionable MRO signal. Other replacement triggers include continuous operation above 80°C housing temperature, visible grease leakage, or reaching the manufacturer's service interval for your duty cycle. Scheduled relubrication and temperature monitoring extend service life significantly — replacement is a last resort, not preventive maintenance. - What temperature should a mounted bearing run at?: Monitor housing surface temperature (the standard MRO measurement point): 40–65°C is normal, 70–75°C warrants investigation of misalignment or over-greasing, and 80°C requires immediate shutdown. The inner race runs 15–30°C hotter than the housing surface, so an 80°C housing reading means lubricant degradation is accelerating and the bearing requires emergency diagnosis. - How often should I grease a mounted bearing?: Use the formula (OD in mm) × (Width in mm) × 0.005 = grams for periodic relubrication of the bearing element only; initial housing cavity fill is separate and should be 30–50% of free volume. Over-greasing damages seals and generates excess heat—stick to the calculated quantity and recommended relubrication schedule. - How do I install a mounted bearing correctly?: Verify your shaft diameter is within the bearing bore tolerance (consult the NSK or SKF datasheet), then secure the bearing to the mounting surface using the specified bolt torque and engage the locking collar or set-screw on the shaft to prevent axial slip. Hand-rotate the shaft through several complete turns with a dial indicator, laser alignment tool, or feeler gauge to confirm smooth operation and proper shaft runout within spec. - 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. - 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 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. - 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. - 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 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.