| Customization: | Available |
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| Contact Angle: | 15° |
| Aligning: | Aligning Bearing |
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| Deep groove ball bearings | Crossed Roller Bearings | Rod end |
| Double row deep groove ball bearing | Needle roller bearings | Radial spherical plain bearings |
| Self-aligning ball bearing | Tapered roller bearings | Stainless Steel Bearings |
| Angular contact ball bearings | Spherical roller bearings | Insulating bearing |
| Thrust ball bearings | Cylindrical roller bearing | Ceramic bearing |
| Pillow Block Bearing | Cylindrical roller thrust bearings | High-temperature bearings |
Double-row steel balls: Two rows of balls arranged symmetrically at contact angles (typically 15°-40°).
Inner & outer rings: Angular contact raceways optimized for load distribution.
Integrated cage: Made of nylon or brass to synchronize double-row ball movement.
Bidirectional axial load capacity: Handles axial loads in both directions alongside radial loads.
High rigidity: Symmetric layout minimizes deformation, ideal for precision positioning.
Compact design: Dual-row integration saves installation space.
Superior load capacity:
Axial load: 50%-80% higher than single-row bearings.
Combined loads: Simultaneously handles radial and axial loads (e.g., gearboxes, spindles).
High precision & rigidity:
Reduces vibration and misalignment in precision equipment (e.g., CNC spindles, robotic joints).
Simplified installation:
Single-unit design eliminates pairing requirements (unlike single-row angular contact bearings).
Extended service life:
Optimized stress distribution minimizes localized wear.
Contact angle:
15°: Prioritizes high speed, low axial loads (e.g., small motors).
25°-40°: Prioritizes heavy axial loads (e.g., industrial machinery).
Dynamic/static load ratings:
Calculate based on operational conditions (refer to ISO 281 standards).
Speed limits:
Slightly lower than single-row bearings (20%-30% reduction due to friction).
Materials:
Chrome steel (GCr15): General-purpose for standard industrial environments.
Stainless steel (440C/316L): Corrosion-resistant for food/chemical industries.
Ceramic hybrid: High-speed, anti-electrolysis (e.g., semiconductor equipment).
Sealing types:
Contact seals (2RS): Dust/waterproof, slightly reduces speed capability.
Non-contact seals (ZZ): Low friction, ideal for high-speed applications.
Installation:
Use thermal or hydraulic tools to avoid deformation.
Ensure proper shaft/housing tolerances (recommended H7/k6 fit).
Preload adjustment:
Eliminate clearance via shims or threaded preload (follow manufacturer guidelines).
Lubrication:
High-speed: Synthetic oils (e.g., PAO).
High-temperature/heavy loads: High-temperature grease (NLGI Grade 2).
| Designation | Principal dimensions | Basic load ratings | Speed ratings | ||||
| dynamic | static | Reference speed | Limiting speed | ||||
| d[mm] | D[mm] | B[mm] | C[kN] | C0[kN] | [r/min] | [r/min] | |
| 3212 A-2RS1TN9/MT33 | 60 | 110 | 36.5 | 75 | 64 | 4 000 | |
| 3212 A-2Z | 60 | 110 | 36.5 | 75 | 64 | 5 600 | 5 600 |
| 3212 A-2Z/C3 | 60 | 110 | 36.5 | 75 | 64 | 5 600 | 5 600 |
| 3212 ATN9 | 60 | 110 | 36.5 | 75 | 64 | 5 600 | 5 600 |
| 3312 A | 60 | 130 | 54 | 127 | 95 | 5 600 | 5 000 |
| 3213 A | 65 | 120 | 38.1 | 80.6 | 73.5 | 5 600 | 4 800 |
| 3213 A-2Z | 65 | 120 | 38.1 | 80.6 | 73.5 | 5 600 | 4 800 |
| 3313 A | 65 | 140 | 58.7 | 146 | 110 | 5 300 | 4 500 |
| 3313 DNRCBM | 65 | 140 | 58.7 | 138 | 122 | 5 300 | 4 500 |
| 3214 A | 70 | 125 | 39.7 | 88.4 | 80 | 5 600 | 4 500 |
| 3214 A-2Z | 70 | 125 | 39.7 | 88.4 | 80 | 5 600 | 4 500 |
| 3314 A | 70 | 150 | 63.5 | 163 | 125 | 5 000 | 4 300 |
| 3215 A | 75 | 130 | 41.3 | 95.6 | 88 | 5 300 | 4 500 |
| 3315 A | 75 | 160 | 68.3 | 176 | 140 | 4 500 | 4 000 |
| 3216 A | 80 | 140 | 44.4 | 106 | 95 | 5 000 | 4 300 |
| 3216 A-2Z | 80 | 140 | 44.4 | 106 | 95 | 5 000 | 4 300 |
| 3316 A | 80 | 170 | 68.3 | 193 | 156 | 4 300 | 3 800 |
| 3217 A | 85 | 150 | 49.2 | 124 | 110 | 4 500 | 3 800 |
| 3217 A/C3 | 85 | 150 | 49.2 | 124 | 110 | 4 500 | 3 800 |
| 3317 A | 85 | 180 | 73 | 208 | 176 | 4 000 | 3 600 |
| 3218 A | 90 | 160 | 52.4 | 130 | 120 | 4 300 | 3 600 |
| 3318 A | 90 | 190 | 73 | 208 | 180 | 3 800 | 3 400 |
| 3219 A | 95 | 170 | 55.6 | 159 | 146 | 4 000 | 3 400 |
| 3319 A | 95 | 200 | 77.8 | 240 | 216 | 3 600 | 3 200 |
| 3220 A | 100 | 180 | 60.3 | 178 | 166 | 3 800 | 3 200 |
| 3320 A | 100 | 215 | 82.6 | 255 | 255 | 3 400 | 2 800 |
| 3222 A | 110 | 200 | 69.8 | 212 | 212 | 3 400 | 2 800 |
| 3322 A | 110 | 240 | 92.1 | 291 | 305 | 3 000 | 2 600 |
| 305256 D | 120 | 190 | 66 | 182 | 232 | 3 400 | 3 600 |
| 305283 D | 150 | 230 | 70 | 203 | 285 | 2 800 | 3 000 |
Q1: What about the MOQ? Can you accept a sample order?
A: Our company MOQ is 1pc, and we can accept sample orders.
Q2: Can you accept OEM/ODM?
A: Yes, we can.Customizing according to your requirements or drawing.
Q3: Do you supply door-to-door service?
A: By air or express(DHL, FEDEX, EMS, etc.)
Q4: Could you tell me the materials of your bearings?
A: Chrome steel, carbon steel, stainless steel, ceramic, and plastic material.
Q5: Are you a factory or trading company?
A: We have our factory, JUDONG Bearing is specializes in manufacturing and exporting bearings.
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