# SealMaster TB-24T 705553 Tap-Based Mounted Bearing 1-1/2" Bore SKWEZLOC Concentric Lock - MROSupply.com ***SealMaster TB-24T 705553 tap-based mounted bearing with 1-1/2" bore, cast iron tapped base pillow block housing. Features 52100 bearing steel insert with black oxide coating, SKWEZLOC concentric locking, and felt-labyrinth seal. Pre-lubricated for general industrial applications.*** ## Product details: - Catalog number: 705553 - SKU: 2259609 - Price: ***$263.34*** Each - Shipping: ***FREE SHIPPING*** ON ORDERS OVER $100 - Typically Ships in: 1 day - Brand: [SealMaster](https://www.mrosupply.com/brands/sealmaster/) - Category: - [Tap Based Bearings](htts://www.mrosupply.com/bearings/mounted-bearings/mounted-ball-bearings/tap-based-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: 5.300 lb - UPC: 662461031070 - 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): 4.625 - Base to Center Height (in): 1.938 - Base Width (in): 1.88 - Bearing Insert Finish: Black Oxide - Bearing Insert Material: 52100 Bearing Steel - Bearing Type: Standard Duty - Bolt Spacing (in): 3.5 - Bore Diameter (in): 1.5 - Bore Shape: Straight - Cage Material: PPS - Polyphenylene Sulfide - Cage Type: Land Riding Retainer - Centerline to Outermost Bearing Face (in): 1.25 - Dynamic Load Rating (lb): 7340 - End Cap: No - Fixed vs. Expansion: Fixed - Grease Fitting Thread Size: 1/4-28 - Height: 5 - Housing: Pillow Block, Tapped Base - Housing Base: Solid - Housing Coating: Powder Coated - Housing Color: Black - Housing Construction: One Piece - Housing Material: Cast Iron - Housing Style: Pillow Block - Housing Width (in): 1.88 - Inner Race Heat Treat Method: Zone-Hardened - Inner Ring OD (in): 2.063 - Insert: 2-18T - Length: 5 - Length Through Bore (in): 2 - Locking Collar Outside Diameter (in): 2.688 - Lubricant: Lithium Complex NLGI 2 Grease - Max Operating Temperature (F): 220 - Maximum Speed (RPM): 5850 - Misalignment Capability: ±2.0° Misalignment - Static Only - Misalignment Type: Static Only - Outer Ring Land Profile: Standard - Overall Height (in): 3.93 - Overall Length (in): 4.63 - Overall Width (in): 2 - Radial Clearance: Standard - Rolling element: Ball Bearing - Seal: Felt Labyrinth Seal - Shaft Locking Type: Concentric - Size Code: 2-19 - Static Load Rating (lb): 4467 - Thread Depth (in): 0.75 - Thread Size: 1/2-13 - Width: 2 ## Product documents / software: - [Catalog Page](https://documents.mrosupply.com/product_documents/TB/TB-12T/MCC12004E_Sec_G-48.pdf) - [Drawing](https://documents.mrosupply.com/product_documents/TB/TB-12T/TB-T.GIF) - [3D Drawing IGES](https://documents.mrosupply.com/product_documents/TB/TB-24T/regalpts_beloit_EPTCAD-TB-24T-DEFAULT_hF1xV3z.IGS) ## Alternate products to `SealMaster TB-24T 705553 Tap-Based Mounted Bearing 1-1/2" Bore SKWEZLOC Concentric Lock - MROSupply.com`: - [Browning VPS-112 767676 2-bolt pillow block mounted ball bearing with a 1-3/4-inch bore and set screw locking. The cast iron housing supports a relubricable single-row deep-groove ball bearing insert with a contact seal. Suitable for conveyor head shafts, fan supports, and general industrial machinery.](https://www.mrosupply.com/products/2271865/as-markdown/) - [Dodge 123580 P2B-VSC-012 two-bolt pillow block bearing with 3/4" bore, set screw locking, intermediate duty rating, 204 series ball bearing, cast iron housing, DualGuard seals with flingers, non-expansion configuration for fixed positioning.](https://www.mrosupply.com/products/126912/as-markdown/) - [Dodge 124479 TB-SC-108 tapped-base pillow block bearing with 1-1/2" bore, set screw locking, standard duty 208 series ball bearing insert. DualGuard seals with flingers, cast iron housing, powder coated finish. Suitable for general industrial applications; maximum speed 5000 rpm. Relubricatable design.](https://www.mrosupply.com/products/125208/as-markdown/) - [Dodge 124473 TB-SC-107 tapped-base pillow block bearing with 1-7/16" bore, set screw locking, cast iron housing, standard duty, 207 series. Non-expansion design for fixed shaft positioning. DualGuard seals with flingers, steel insert, powder coated finish, relubrication capable, 5500 rpm max.](https://www.mrosupply.com/products/125206/as-markdown/) - [Dodge 128751 TB-DL-108 tapped base pillow block bearing with 1-1/2" bore, D-Lok concentric clamp collar locking, standard duty ball bearing insert, cast iron housing, DualGuard seals with flingers, non-expansion design for fixed shaft positioning, 5000 rpm maximum speed, general purpose application.](https://www.mrosupply.com/products/125651/as-markdown/) - [Dodge 128755 TB-DL-115 tapped base pillow block bearing with D-Lok concentric clamp collar locking, 1-15/16" bore, standard duty ball bearing insert, cast iron housing, non-expansion fixed mount, DualGuard seal with flingers, 4500 RPM maximum speed, general purpose application.](https://www.mrosupply.com/products/125653/as-markdown/) - [Dodge 124469 TB-SC-104S tapped-base pillow block bearing with 1-1/4" bore, 65-degree set screw locking, cast iron housing, standard duty rating, DualGuard seals with flingers, 206 series, non-expansion design for fixed shaft positioning. Relubricatable steel ball bearing insert for general purpose applications up to 6500 rpm. Powder coated finish.](https://www.mrosupply.com/products/130861/as-markdown/) - [Browning VTBS-231 767936 take-up mounted ball bearing with a 1.938-inch bore and set screw locking. Cast iron housing with a 52100 bearing steel insert, black oxide coated inner ring, and single lip contact seal with flinger for contaminant protection. Suitable for belt conveyor tensioning applications.](https://www.mrosupply.com/products/2272528/as-markdown/) ## Product's reviews: - Solutions - Fast service, and excellent competitive price. - 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. - Response - Very knowledgeable sales rep. Excellent delivery time. Very important when supply chains are challenging. - Drum bearing - Very easy to order, arrived very quickly, We will be ordering more items from here in the future. ## FAQ: - What is a tapped base bearing, and how does it differ from other pillow block mountings?: A tapped base bearing is a pillow block unit with pre-drilled, internally threaded holes in its base that allow direct bolt attachment to machine frames without requiring separate nuts. This design provides a compact, secure mounting solution compared to standard pillow blocks that use through-holes with external nuts. - What maintenance routine should I follow for tapped base bearings?: Periodically inspect for unusual noises, vibrations, or heat; check mounting bolt tightness and retighten if needed without over-torquing. Monitor operating temperature regularly, and watch for signs of wear, contamination, or inadequate lubrication. - How do I properly install and secure a tapped base pillow block bearing?: First, ensure the mounting surface is clean, flat, and perpendicular to the shaft. Insert bolts through the tapped holes and tighten securely using the manufacturer-specified bolt size and torque—avoid over-tightening, which can distort the housing. Use the set screws to lock the bearing insert to the shaft. - What load safety factor should I use when selecting a tapped base bearing?: For smooth, steady loads, ensure the dynamic load rating exceeds the actual radial load by at least 1.5×. For shock or impact loads, use a safety factor of 2.0–3.0× the actual load to prevent premature bearing failure. - When should I use ball bearings versus roller bearings in tapped base pillow blocks?: Ball bearings in tapped base units are best for lighter radial loads and higher-speed applications, typically 1,000–3,000 RPM and above. Roller bearings are preferred for heavier loads and lower speeds (under 1,500 RPM) where shock loads or extended radial load capacity is needed. - 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 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. - 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. - 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 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. - 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. - 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. - 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. - 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 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 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.