B7208-C-T-P4S-UL
Main technical Specifications
Detailed parameters and installation dimensions:
| Part Number | B7208-C-T-P4S-UL |
| Design Type | B = Standard bearing, Lager balls, Steel balls |
| Series | B72..-C-T-P4S-UL |
| Bearing Type | Super Precision Angular Contact Ball Bearing |
| Contact angle - α | (C) 15 ° |
| Dimension series | 72 (Heavy series) |
| Bearing set | UL |
| Accuracy class | P4S |
| Seal | Open |
| Arrangement | U = Single bearing arrangeable as desired |
| Preload | L = Preload Light |
| Row No. | One |
| Bore Type | Z = Cylindrical bore |
| Units | Metric |
| Bearing Mass - m | 0.372 kg | 0.820 lb |
| Cage | T = Laminated fabric, guidance on outer ring |
| Ball Material | GCr15SiMn |
| Ring Material | GCr15SiMn |
| Manufacturer Part Code | B7208CTP4SUL , B7208C-T-P4S-UL |
| Reference From | FAG B7208-C-T-P4S-UL |
| Dimension Inside - d φ (mm) | 40 |
| Dimension Outside - D Φ (mm) | 80 |
| Dimension Width - B (mm) | 18 |
| Dimension - r(min.) | 1.1 mm | 0.043 inch |
| Dimension - r1(min.) | 1.1 mm | 0.043 inch |
| Temperature - T(min) | -30°C |
| Temperature - T(max) | +100°C |
| Radial Dynamic Capacity - Cr | 32420 N | 7288 lbf |
| Radial static Capacity - C0r | 15980 N | 3592 lbf |
| Reference speed (grease) - nB | 17862 min–1 |
| Limiting speed (oil) - nG | 29893 min–1 |
| Mounting dimensions - da(h12) | 48 mm | 1.890 inch |
| Mounting dimensions - Da(H12) | 72 mm | 2.835 inch |
| Mounting dimensions - Etk(nom.) | 57.2 mm | 2.252 inch |
| Preload force - Fv L | 208 N | 46 lbf |
| Preload force - Fv M | 603 N | 135 lbf |
| Preload force - Fv H | 1138 N | 255 lbf |
| Axial rigidity - ca L | 45.2 N/μm |
| Axial rigidity - ca M | 79.7 N/μm |
| Axial rigidity - ca H | 119 N/μm |
| Lift-off force - KaE L | 546 N | 122 lbf |
| Lift-off force - KaE M | 1927 N | 433 lbf |
| Lift-off force - KaE H | 4135 N | 929 lbf |
NOTE: All other trademarks are the property of their respective owners, used for the purpose of compatibility description and product identification only. Tradebearings is not affiliated with, endorsed by, or sponsored by the holders of these trademarks.
B7208-C-T-P4S-UL refers to a type of B72..-C-T-P4S-UL Super Precision Angular Contact Ball Bearing, with dimensions 40 mm (Bore) x 80 mm (OD) x 18 mm (Width), designed for High speed, ultra-precision, high rigidity, low operating friction, and long service life, primarily used in CNC machine tool spindles and other high-precision machinery, Its normal operating speed can reach: the grease speed ratings: 17862 rpm, oil speed ratings: 29893 rpm, featuring One (row) construction, T = Laminated fabric, guidance on outer ring retainer to ensure extended service life, advanced Open, P4S (precision) for applications the field of precision machinery, especially high-speed and high-precision spindle systems, requiring high running accuracy and the accommodation of radial and axial loads simultaneously.. it's built to handle significant loads (dynamic radial: 32420 N, static radial: 15980 N, ), It weight approximately 0.372 kilogram.
- Min. Order: 1 Piece/(B7208-C-T-P4S-UL, 40 = ID, 80 = OD, 18 = B, 0.372 kg) or according to different suppliers
- Price: Different brands, different quality, different B7208-C-T-P4S-UL prices, different suppliers and different quality determine different prices, you can ask the supplier in detail for the price according to your own needs.
- Precision Rating: DIN: P2~P0; ANSI: ABEC9~ABEC1; JIS: JIS~JIS0; ISO: CLASS2~NORMAL CLASS; GB/T30794 B~G
- Inquiry ways: The right of the inquiry form, Email, skype, Whatsapp
Specifications From Tradebearings:
| Material Of Cage: | Fabric |
| Seal Close Type: | Open |
| Max speed: | 18000 rpm Reference speed 1/min (Grease), 30000 rpm Limiting speed 1/min (Oil) |
| Bearing Series: | Heavy Series |
| Operating Temperature Range: | -30 to 100 °C |
| Bore Dia. (d): | 40 mm |
| Outside Dia. (D): | 80 mm |
| NO. of Rows: | 1 |
| Width (B): | 18 mm |
| Contact Angle (α): | 15 ° |
| Load Rating: | 32.5 kN |
Data Transfering...
✨What are the Benefits of choosing B7208-C-T-P4S-UL bearings?
🏭 What are the applications of the B7208-C-T-P4S-UL bearing?
📐 How should choose the right model for a High precision angular contact ball bearings?
Following the naming logic of "basic model + suffix," the key steps for selection are as follows:
Step 1: Contact Angle Determines Basic Load-Bearing Direction
Ultra-precision angular contact ball bearings have contact angles indicated by letters following their basic model number:
C = 15° Contact Angle: Suitable for ultra-high-speed rotation, relatively weak axial load-bearing capacity, a typical choice for high-precision, high-speed operation scenarios.
D (or AC) = 25° Contact Angle: General purpose, balancing high speed and axial rigidity.
E (or B) = 40° Contact Angle: Suitable for heavy-duty applications, good axial rigidity, but lower limiting speed.
Step 2: Design Variations Determine Performance Orientation
Ultra-precision spindle bearings have various internal design variations, identified by prefixes or suffixes:
No Code: Standard design, steel balls.
HC: Hybrid ceramic balls (silicon nitride balls + steel rings), enabling higher speeds, electrical insulation, lower heat generation, and longer lifespan.
X-life: Schaeffler's top-quality designation, representing higher load-bearing capacity, lower friction, and longer lifespan.
E: High-performance design, usually indicating superior performance. Internal Geometry
Step 3: Cage Code
Cage material directly affects high-speed performance and operational stability:
T: Laminated phenolic resin cage, outer ring guided (standard high-speed design)
TP: Also phenolic resin cage, but for rolling elements guided
P: Plastic cage (e.g., PEEK material)
G: Solid brass cage, suitable for higher temperatures or special operating conditions
Step 4: Universal Pairing and Preload
Ultra-precision bearings are all universally paired, allowing for arbitrary back-to-back, face-to-face, or tandem configurations. Preload is indicated by the following suffixes:
UL: Universal Light – Suitable for high-speed applications
UM: Universal Medium – Suitable for high-speed applications
UH: Universal Heavy – Suitable for high-rigidity applications
LO: Light Preload
L: Another way to indicate light preload
Step 5: Accuracy Grade
FAG ultra-precision bearing accuracy grade suffixes:
P4: ISO Class 4 accuracy, standard ultra-precision grade
P4S: Schaeffler standard, a higher accuracy grade than P4 (operating accuracy can reach P2 level), the standard configuration for FAG spindle bearings
P2: ISO Class 2 accuracy, the highest grade
Typical Model Interpretation
Using HC7008-E-T-P4S-UL For example:
HC: Hybrid ceramic ball bearing (ceramic ball + steel ring)
7008: 70 series, 40mm inner diameter
E: High-performance design (25° contact angle)
T: Phenolic resin cage, outer ring guided
P4S: Ultra-precision grade (higher than P4)
UL: Universal mating, light preload
This model designation indicates: a 70 series hybrid ceramic ball bearing with a 40mm inner diameter, 25° contact angle, phenolic resin cage, P4S precision grade, universal mating, and light preload—suitable for general applications such as high-speed machining center spindles.
Key Selection Points Summary
Determine Contact Angle: C (15° high speed), D/AC (25° general purpose), E/B (40° heavy load)
Select Material: No designation = steel balls, HC = ceramic balls (higher performance)
Match Cage: T (phenolic resin) suitable for most high-speed applications
Set Preload: UL (light preload) general purpose, UM/UH for high rigidity requirements
Confirm Accuracy: P4S is the standard configuration for FAG ultra-precision bearings
Following the order of "Contact Angle → Material → Cage → Preload → Accuracy" will provide a complete understanding of the FAG ultra-precision angular contact ball bearing models.
🛠️ What is the mounting procedure for B7208-C-T-P4S-UL bearings?
Cleaning and Inspection: Clean the bearing in a dust-free environment. After a rough wash to remove contaminants, perform a fine wash until the bearing feels smooth and responsive to the touch. Simultaneously check the accuracy of the mating surfaces of the shaft and bearing housing.
Measurement and Fitting: Precisely measure the bearing's inner and outer diameters. Mark the corresponding positions on the shaft and housing bores for alignment during assembly to compensate for any deviations.
Installation and Positioning: Apply pressure evenly using a specialized tool, focusing only on the interference fit rings. If heat fitting is used, tighten the inner ring during cooling to prevent clearance from affecting the preload.
Preload Adjustment: When installing in pairs, ensure the parallelism of the inner and outer spacers is ≤1μm. Adjust the preload force to the specified value by grinding the spacers.
Lubrication Inspection: Add the specified amount of grease or oil mist lubricant. After installation, manually rotate the bearing to check its flexibility and operating noise.
📋 Special Note for mounting B7208-C-T-P4S-UL bearings?
Clean Environment: Operation must be performed in a dust-free cleanroom with humidity ≤65% to prevent dust and impurities from affecting accuracy.
No Striking: Direct striking of the bearings is strictly prohibited. Special tools must be used, and force must be applied evenly.
Matching Marks: Bearings used in pairs are not interchangeable. Installation must strictly follow the factory matching marks.
Rust-Proof Storage: Long-term storage requires regular rust-proofing treatment. Maintain ventilation and avoid corrosive gases.