Finding the right industrial components for your machinery shouldn’t feel like solving a puzzle with missing pieces. If you’ve ever stood in front of a piece of equipment with a worn part number, frantically searching catalogs and websites for a match, you know exactly how frustrating component identification can be.
Whether you’re:
- a purchasing agent trying to source parts quickly,
- a maintenance professional facing an urgent repair,
- or an engineer specifying new applications…
… you need reliable information fast.
This comprehensive guide eliminates the guesswork from your selection process. You’ll discover how to quickly identify replacement parts even when original markings are illegible, understand what those confusing number and letter combinations actually mean, and select optimal components for your specific operating conditions.
Find what you need in minutes, not hours.
5 Ways to Use This Bearing Types Chart for Maximum Efficiency
Smart professionals know that having the right reference materials can transform tedious tasks into quick wins. This chart becomes your secret weapon for cutting through complexity and making confident decisions faster than ever before.
- For replacement/identification – When equipment breaks down and you’re staring at a component with worn or missing part numbers, use the dimensional data and visual identification features to match specifications. Measure the bore diameter, outer diameter, and width, then cross-reference these measurements with load requirements and speed ratings to find exact replacements or suitable alternatives.
- For new applications – During the design phase of new machinery or equipment upgrades, reference the performance characteristics and application guidelines to select components that meet your specific requirements. Compare dynamic and static load ratings against your calculated loads, verify speed capabilities, and choose appropriate seal configurations for your operating environment.
- For bulk purchasing – Leverage the comprehensive specifications to identify opportunities for standardization across multiple applications. Group similar components with compatible dimensions and performance ratings to negotiate better pricing on larger quantities while reducing inventory complexity and stocking requirements.
- For maintenance planning – Use the detailed information to develop proactive maintenance schedules based on component specifications and operating conditions. Identify critical applications where premium precision classes or specialized materials justify higher upfront costs through extended service life and reduced downtime risks.
- For supplier negotiations – Armed with complete technical specifications and cross-reference data, you can confidently evaluate quotes from multiple suppliers, ensuring you’re comparing equivalent products rather than falling victim to specification variations or inferior substitutes that compromise performance.
Each use case saves valuable time while reducing the risk of costly mistakes that plague rushed procurement decisions.
Save Time & Eliminate Frustration with This Ultimate Bearing Types Chart
This comprehensive reference puts all the essential information you need right at your fingertips. Each row provides instant access to key specifications including load capabilities, speed ratings, and typical applications – helping you make informed decisions quickly.
The chart organizes information by component type, making it easy to compare options and identify the best solution for your specific requirements. Whether you’re dealing with high-speed applications, heavy radial loads, or challenging environmental conditions, you’ll find the technical details needed to specify with confidence.
Industrial Bearing Types Quick Reference Chart
| Bearing Type | Visual ID | Radial Load | Axial Load | Speed Rating | Key Applications | Nomenclature | Central Surplus Inventory |
|---|---|---|---|---|---|---|---|
| Pillow Block | Mounted unit with housing | High | Low | 3,000-5,000 RPM | Conveyor systems, agricultural equipment, general machinery | UC, UCP, UCF, P2B, SYR, SYM, NPseries | In Stock ✅ |
| Cup and Cone | Tapered design, separable | Very High | Very High | 2,000-4,000 RPM | Automotive wheels, heavy machinery, gearboxes | 30000, 32000 series | In Stock ✅ |
| Self Aligning | Double row, spherical outer ring | Medium | Low | 2,500-6,000 RPM | Misaligned shafts, wood processing, mining equipment | 1200, 2200 series | In Stock ✅ |
| Angular Contact | Single row, contact angle | Medium | High | 8,000-15,000 RPM | Machine tool spindles, pumps, compressors | 7000, 7200 series | In Stock ✅ |
| Spherical Roller | Double row, barrel-shaped rollers | Very High | High | 1,500-3,500 RPM | Steel mills, paper machines, marine propulsion | 22000, 23000 series | In Stock ✅ |
| Cylindrical Roller | Single/double row cylindrical | Very High | None | 5,000-12,000 RPM | Electric motors, gearboxes, rolling mills | NU, NJ, N series | In Stock ✅ |
| Precision Bearing | High accuracy, low runout | Medium | Medium | 15,000-25,000 RPM | Machine tools, medical equipment, aerospace | P4, P5 classes | In Stock ✅ |
| Linear Blocks & Rails | Rectangular block on rail | Medium | None | 200-500 m/min | CNC machines, automation, packaging | LM, SBR series | In Stock ✅ |
| Roller Bearings | Cylindrical/tapered rollers | High | Variable | 3,000-8,000 RPM | Industrial equipment, automotive, construction | Various series | In Stock ✅ |
| Tapered Roller Bearings | Cone-shaped, separable | Very High | Very High | 1,500-4,000 RPM | Truck wheels, differential, heavy equipment | 30000, 32000 series | In Stock ✅ |
| Insert Bearing | Spherical with locking collar | Medium | Low | 2,000-4,500 RPM | Agricultural, food processing, conveyor systems | UC200, SA200 series | In Stock ✅ |
| Thrust Bearing | Flat design, axial loads only | Low | Very High | 500-2,000 RPM | Vertical shafts, marine propellers, cranes | 51000, 52000 series | In Stock ✅ |
| Super Precision | Ultra-high accuracy | Medium | Medium | 20,000-50,000 RPM | Machine tool spindles, aerospace, medical devices | ABEC 7-9 classes | In Stock ✅ |
| Flange Mount | Flanged outer ring | Medium | Low | 2,500-5,000 RPM | Pumps, motors, agricultural equipment | UCF, UCFL series | In Stock ✅ |
| Needle Rollers | Small diameter, high capacity | Very High | None | 4,000-10,000 RPM | Automotive transmissions, compact spaces | NK, HK series | In Stock ✅ |
| Take Up Bearing | Adjustable mounting | Medium | Low | 2,000-4,000 RPM | Conveyor tensioning, belt drives | UCT series | In Stock ✅ |
| Plain Bearings | No rolling elements | High | Variable | 100-10,000 RPM | Marine, heavy industry, low maintenance | Bronze, composite | In Stock ✅ |
| Ball Screw Support | Precision angular contact | Medium | High | 8,000-18,000 RPM | CNC machines, automation, robotics | BSA, BSB series | In Stock ✅ |
| Yoke/Cam Follower | Track following design | High | Medium | 1,000-3,000 RPM | Packaging, textile, cam mechanisms | CF, KR series | In Stock ✅ |
From Bearing Size Chart to Cart: Our Experienced Team + Vast Inventory Sources the Exact Bearing You Need
- Found the perfect match in our chart but need to verify compatibility?
- Or maybe you’ve identified the type you need but require specific materials, seals, or precision classes not listed?
This is where Central Surplus transforms from just another supplier into your trusted technical partner. Our team doesn’t just take orders—we solve problems. When you contact us with a challenging application or worn component that’s difficult to identify, we leverage decades of combined experience to find solutions.
What sets us apart is our extensive network of suppliers and manufacturers. While other distributors might tell you “we don’t carry that,” we start making calls. Our relationships with major brands like SKF, Timken, NSK, NTN, FAG, INA, KOYO, and Torrington, plus dozens of specialized manufacturers, mean we can locate even the most obscure requirements.
Ready to experience the difference? Reach out with your requirements and discover why maintenance professionals choose Central Surplus for their critical component needs.
Decoding 4 Key Bearing Nomenclature Elements: What Do the Numbers & Letters in the Chart Mean?
Ever stared at a part number like “6208-2RS-C3” or “S7016-ACE/HCP4ADGA” and wondered, “What do all those cryptic codes actually mean?”
You’re not alone.
Understanding nomenclature is crucial for accurate ordering, finding cross-references, and avoiding costly mistakes that lead to returns or bearing failures. The good news is that most manufacturers follow standardized conventions, making it easier to decode specifications once you understand the basic structure.
These alphanumeric combinations aren’t random—they’re a systematic way to communicate critical information about bore diameter, load capacity, precision class, sealing configuration, and special features in a compact format.
Mastering this coding system transforms you from someone who relies entirely on part number matching to a professional who can identify suitable alternatives, understand performance characteristics, and make informed substitutions when exact matches aren’t available.
This knowledge becomes invaluable when dealing with obsolete parts, emergency replacements, or cost-optimization projects where equivalent specifications from different manufacturers might offer better value.
Basic Structure: [Prefix] – [Basic Number] – [Suffix]
- Example: S6208-2RS-C3
- Breakdown: S (stainless steel) + 6208 (single row deep groove ball, 40mm bore) + 2RS (double rubber seals) + C3 (increased internal clearance)
- Example: S7016-ACE/HCP4ADGA
- Breakdown: S (stainless steel) + 7016 (angular contact, 80mm bore) + AC (25° contact angle) + E (optimized internal design) + HC (ceramic balls) + P4A (precision class ABEC-7/ISO class 4) + D (duplex arrangement) + G (universal ground) + A (light preload)
These examples show how manufacturers pack detailed technical specifications into concise part numbers, enabling precise communication between engineers, purchasing agents, and suppliers worldwide.
1. First Digit: Bearing Type Identification
The first digit or letter in most part numbers immediately tells you what type of component you’re dealing with. This is your fastest way to identify whether you’re looking at a deep groove ball unit, angular contact design, or specialized configuration. Understanding this coding prevents ordering mistakes and helps you quickly locate alternatives when needed.
Different manufacturers use slightly different conventions, but most follow ISO standards for consistency. For example, the number “6” always indicates a single-row deep groove ball design, while “7” signifies angular contact construction. Some manufacturers add letters before the numeric code to indicate special materials or construction features.
| First Digit | Bearing Type | Example |
|---|---|---|
| UC, UCP, P2B, SYR, SYM | Pillow Block | UCP208 |
| Various | Cup and Cone | 32008, 780, H715311 |
| 12, 22 | Self Aligning | 1206, 2208 |
| 7 | Angular Contact | 7208, 71910 |
| 20, 21, 22, 23 | Spherical Roller | 22208, 23208 |
| N, NU, NJ, NN, NNU | Cylindrical Roller | NU208, NJ208, NN3008 |
| P4, P5, P6, P3, P2 | Precision Bearing | 6208-P4A, 7208-P5 |
| LM, SBR | Linear Bearings & Rails | LM20UU, SBR20 |
| Various | Roller Bearings | NU208, 22208 |
| UC, SA | Insert Bearing | UC208, SA208 |
| Various | Tapered Roller Bearings | 30208, LL52549 |
| 51, 52 | Thrust Bearing | 51208, 52208 |
| 6 | Ball Bearings | 6201, 6208, 6305 |
| Various | Self Aligning | 2307, 1216 |
| Various | Super Precision | 7007CTSULP2 |
| UCF, UCFL, F2B, F4B, FY | Flange Mount | UCF208, UCFL208 |
| NK, HK | Needle Rollers | NK25/20, HK2020 |
| UCT, WSTUS, RTU, TC | Take Up Bearing | UCT208 |
| DU, GE, PB | Plain Bearings | DU2020, GE25ES |
| BSA, BSB | Ball Screw Support | BSA309, BSB040 |
| CF, KR | Yoke/Cam Follower | CF12, KRV26 |
2. Second Digit: Dimension Series
The second digit reveals the size relationship between the outer diameter and bore diameter, essentially telling you how “heavy duty” the component is. This dimension series affects load capacity, with higher numbers generally indicating larger outer diameters and greater load-carrying capability for the same bore size.
Understanding dimension series helps you identify when you might substitute a light-duty component with a medium or heavy-duty version if your application demands higher load capacity. However, remember that larger outer diameters require more housing space, so always verify dimensional compatibility before making substitutions.
- Light Series (0, 1, 2): Compact designs with smaller outer diameters, suitable for space-limited applications where moderate loads are expected. Series 02 and 03 are most common in general machinery applications.
- Medium Series (3): Balanced design offering good load capacity while maintaining reasonable size. Series 03 provides excellent versatility for most industrial applications requiring reliable performance.
- Heavy Series (4): Larger outer diameters providing maximum load capacity for given bore sizes. Used in heavy machinery, mining equipment, and applications where extreme loads or shock loading occur.
3. Last Two Digits: Bore Size Calculation
The final two digits of the basic number indicate the bore diameter, but the calculation method changes depending on the size range. This system allows manufacturers to cover an enormous range of bore sizes while keeping part numbers manageable in length.
For most applications you’ll encounter, simply multiply the last two digits by 5 to get the bore diameter in millimeters. However, smaller sizes use different conventions to accommodate the precision requirements of miniature applications.
- 00-03: These special codes represent specific small bore sizes: 00=10mm, 01=12mm, 02=15mm, 03=17mm. These exceptions accommodate common shaft sizes that don’t fit the standard multiplication rule.
- 04 & Up: Multiply by 5 to get bore diameter in millimeters. For example: 04 × 5 = 20mm bore, 08 × 5 = 40mm bore, 12 × 5 = 60mm bore. This system continues up through large industrial sizes.
4. Manufacturer-Specific Variations
While international standards provide consistency, each major manufacturer adds their own refinements and specializations to the basic coding system. These variations often indicate proprietary technologies, special materials, or performance enhancements that differentiate their products in the marketplace.
- SKF variations: Uses Explorer technology designation (E), special heat treatment codes, and unique cage material indicators. Their INSOCOAT series adds electrical insulation coding for motor applications.
- Timken variations: Employs different tapered roller coding systems and adds specific codes for automotive applications. Their precision class markings often differ from ISO standards.
- NSK variations: Includes unique high-speed design codes and special materials designations. Their machine tool spindle products use proprietary accuracy class markings beyond standard ABEC ratings.
6 FAQs to Help You Read a Bearing Types Chart Like a Pro
Navigating technical specifications and nomenclature can be overwhelming, especially when equipment downtime is costing you money. These frequently asked questions address the most common challenges professionals face when using reference charts to identify, select, and order the right components for their applications.
1. How do I identify a bearing when the part number is completely worn off or illegible?
Start by measuring the key dimensions using calipers: inner diameter (bore), outer diameter, and width. Cross-reference these measurements in the dimensional specifications section of our chart. Pay attention to the load requirements and speed ratings for your application, then match these against the performance characteristics listed.
If you’re still unsure, take clear photos of the component and contact our technical team – we can often identify mystery parts from visual cues like cage design, seal configuration, and overall construction details.
2. Can I substitute a different brand or series if I can’t find the exact original part number?
Yes, but verify that all critical specifications match: bore diameter, outer diameter, width, load, precision ratings, and speed capabilities. Different manufacturers may use different suffixes for the same basic specifications.
For example, SKF’s “-2RS” and NSK’s “-DDU” both indicate double rubber seals. Always confirm that dynamic load ratings, static load ratings, and limiting speeds meet or exceed your application requirements.
3. What’s the difference between precision classes like ABEC-1, ABEC-5, and P4, and when do I need higher precision?
Precision classes indicate manufacturing tolerances for dimensional accuracy and surface finish.
ABEC-1 (or P0) is standard precision suitable for most general applications. ABEC-5 (P5) offers tighter tolerances for better performance in moderate-speed applications. ABEC-7 (P4) and ABEC-9 (P2) provide ultra-high precision for machine tool spindles, aerospace applications, and high-speed equipment.
Higher precision classes cost significantly more, so only specify them when your application truly demands superior accuracy and smooth operation at elevated speeds.
4. How do I know if I need sealed, shielded, or open bearings for my application?
Consider your operating environment and maintenance capabilities. Open designs (no suffix) offer lowest friction and highest speeds but require external sealing and regular lubrication.
Shields (Z, ZZ) provide basic protection from large contaminants while allowing lubrication access. Seals (RS, 2RS) offer superior protection from dirt and moisture but create more friction and limit maximum speeds.
For food processing, outdoor equipment, or dusty environments, sealed versions prevent contamination. For high-speed applications or easy-to-maintain equipment, open designs often perform better.
5. What do clearance codes like C2, C3, and C4 mean, and how do I choose the right one?
Internal clearance affects how much the rolling elements can move within the races before load is applied. Standard clearance (no marking) works for most applications.
C2 indicates reduced clearance for precision applications or light loads. C3 provides increased clearance for applications with thermal expansion, interference fits, or moderate misalignment. C4 offers maximum clearance for extreme temperatures or heavy interference fits.
Choose based on your mounting method, operating temperature, and shaft/housing materials. When shafts expand significantly during operation, larger clearances prevent binding.
6. How can I determine load ratings and verify they’re adequate for my application?
- Dynamic load rating (C) indicates the load a component can handle for one million revolutions at rated speed.
- Static load rating (C0) shows maximum load when stationary or at very low speeds.
Calculate your actual loads including radial forces, axial forces, and any shock or impact loading. Your calculated loads should be significantly below the rated capacities – typically 25-50% for standard applications, or even lower for critical equipment.
Consider factors like misalignment, contamination, and lubrication quality that can reduce actual load capacity.
Join the Leading Professionals Who Use Our Bearing Types Chart & Inventory for Their Operations
Stop wasting time with suppliers who don’t understand your urgency or technical requirements.
Maintenance professionals, purchasing agents, and engineers across manufacturing, food processing, aerospace, and heavy industry trust Central Surplus because we deliver exactly what they need, when they need it. Our comprehensive inventory and sourcing network means you get the right specifications the first time, eliminating costly returns and reducing equipment downtime.
Whether you’re dealing with an emergency breakdown, planning a major maintenance project, or optimizing your inventory for better cost control, our team combines this technical reference guide with real-world expertise to solve your component challenges. We stock the quality brands you recognize, plus we can source specialty items that other suppliers can’t find.
Ready to experience the difference that technical expertise and reliable inventory make?
- Contact Central Surplus today for a quote on your current requirements
- or check out our eBay storefront
…with thousands of parts ready to ship today. Your equipment deserves components that perform, and your business deserves a supplier who understands that downtime isn’t an option.
