7008CEGB/P4A
Main technical Specifications
Detailed parameters and installation dimensions:
| Part Number | 7008CEGB/P4A |
| Bearing Type | super-precision angular contact ball bearings |
| Internal design | CE = 15° contact angle, high-speed E design |
| Series | 70..-CEGB/P4A |
| Accuracy class | P4A |
| Rows NO. | 1 |
| Cage | Cotton fabric reinforced phenolic resin or carbon fibre reinforced PEEK, outer ring centred |
| Dimension series | ISO dimension series 10 |
| Ball material | GCr15SiMn |
| Contact angle - α | 15 ° |
| Manufacturer Part Code | 7008 CEGB/P4A |
| Dimension | |
| Inside - d φ | 40 mm | 1.575 inch |
| Outside - D Φ | 68 mm | 2.677 inch |
| Width - B | 15 mm | 0.591 inch |
| Chamfer - r1,r2(min.) | 1 mm | 0.039 inch |
| Chamfer - r3,r4(min.) | 0.6 mm | 0.024 inch |
| Fillet - ra(max.) | 1 mm | 0.039 inch |
| Fillet - rb(max.) | 0.6 mm | 0.024 inch |
| d1 | 49.7 mm | 1.957 inch |
| d2 | 47.6 mm | 1.874 inch |
| D1 | 60.9 mm | 2.398 inch |
| D2 | 60.9 mm | 2.398 inch |
| Balls diameter | 7.144 mm | 0.281 inch |
| Properties | |
| Bore Type | Z = Cylindrical Bore |
| Ring material | Carbon chromium steel |
| Balls qty （single） | 19 |
| Temperature - T(min) | -30 °C |
| Temperature - T(max) | +110 °C |
| Bearing Mass - m | 0.19 kg | 0.419 lb |
| Units | Metric |
| Contact type | 2-point contact |
| Single bearing - execution and preload | GB = Single, universally matchable, moderate preload |
| Ring type | inner rings(1 piece), outer rings(1 piece) |
| Load Direction | Angular Contact |
| Seal | open |
| Grease quantity - Gref | 2.8 cm3 |
| Calculation coefficient - f0 | 8.1 |
| Performance (Load Capacity and speeds) | |
| Dynamic Radial - Cr | 12302 N | 2765 lbf |
| Static Radial - C0r | 7512 N | 1688 lbf |
| Fatigue Radial - Pu | 305 N | 68 lbf |
| Attainable speeds (Grease) | 29957 r/min |
| Attainable speeds (Oil-air) | 44888 r/min |
| Abutment dimensions | |
| da(min.) | 44.6 mm | 1.756 inch |
| db(min.) | 44.6 mm | 1.756 inch |
| Da(max.) | 63.4 mm | 2.496 inch |
| Db(max.) | 63.8 mm | 2.512 inch |
| dn | 51.6 mm | 2.031 inch |
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7008CEGB/P4A refers to a type of 70..-CEGB/P4A super-precision angular contact ball bearings, with dimensions 40 mm (Bore) x 68 mm (OD) x 15 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: 29957 rpm, oil speed ratings: 44888 rpm, featuring 1 (row) construction, Cotton fabric reinforced phenolic resin or carbon fibre reinforced PEEK, outer ring centred retainer to ensure extended service life, advanced open, P4A (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: 12302 N, static radial: 7512 N, ), It weight approximately 0.19 kilogram.
- Min. Order: 1 Piece/(7008CEGB/P4A, 40 = ID, 68 = OD, 15 = B, 0.19 kg) or according to different suppliers
- Price: Different brands, different quality, different 7008CEGB/P4A 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
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✨What are the Benefits of choosing 7008CEGB/P4A bearings?
🏭 What are the applications of the 7008CEGB/P4A bearing?
📐 How should choose the right model for a Angular Contact Ball Bearings?
Step 1: Select Series by Size
Determine the ISO size series based on installation space and load requirements:
718 Series: Ultra-light, extremely low cross-section height, suitable for space-constrained applications.
719 Series: Extremely light, a general-purpose choice, balancing rigidity and speed.
70 Series: Light, the most commonly used series, with a wide range of applications.
72 Series: Robust, largest cross-section, suitable for heavy-duty, relatively low-speed applications.
Step 2: Select Internal Design by Working Condition (Crucial)
This is the core of SKF selection; different suffixes correspond to different performance orientations:
High Load Capacity D Design: Suffix CD (15° contact angle) or ACD (25° contact angle). Utilizes a large ball design, offering the highest rigidity and load-bearing capacity, suitable for general-purpose machine tool spindles such as machining centers and lathes.
High Speed E Design: Suffix CE (15°), FE (18°), or ACE (25°). Featuring a small, multi-ball design, this bearing boasts higher speed capabilities than the D design, suitable for ultra-high-speed applications such as electric spindles and PCB drilling.
High-Speed B Design: Suffixes CB (15°), FB (18°), or ACB (25°). Smaller and lighter balls, suitable for extremely high speeds and light loads.
UltraFast A Design: Suffix AB (20° contact angle). Available only with hybrid ceramic balls, designed specifically for electric spindles demanding extreme speeds.
Sealed W Design: Suffix FW (18° contact angle). Available only with hybrid ceramic balls, featuring double-sided sealing and lifetime lubrication, suitable for medium-to-high-speed, maintenance-free equipment such as woodworking machinery.
Step 3: Identifying the Seal and Suffix
Seal Identification (Prefix): Models starting with S indicate double-sided sealing (e.g., S7010), pre-filled with grease at the factory, requiring no maintenance for life. Those without S are open bearings.
Material: HC indicates hybrid ceramic balls (ceramic balls + steel rings), enabling higher speeds, electrical insulation, and longer lifespan.
Preload (universal pairing): GA (ultra-light preload), GB (light preload), GC (medium preload). This is a suffix for a single bearing, indicating that the bearing can be arbitrarily paired and combined to achieve a specified preload.
Precision: P4 (ISO Class 4, standard ultra-precision), P4A (operating precision higher than P4), P2 (highest grade).
Arrangement (pair/group suffix): DB (back-to-back), DF (face-to-face), DT (tandem), QBC (quadruple, tandem back-to-back configuration), etc.
Typical Model Explanation
Taking S7010 ACD/HCP4A QBC C as an example:
S: Double-sided seal (lifetime lubrication)
7010: 70 series, 50mm inner diameter
ACD: 25° contact angle, D design (high load capacity)
HC: Hybrid ceramic balls
P4A: Precision grade (super P4)
QBC: Quadruple bearing assembly, tandem back-to-back configuration
C: Medium preload (for heavy preload)
Taking 71922 CDGB TNHA/PA9A L as an example:
71922: 719 series, 110mm inner diameter
CD: 15° contact angle, D design (high load capacity)
GB: Light preload (universal matching)
TNHA: Glass fiber reinforced PEEK cage, outer ring centering
PA9A: Precision grade (ISO) Level 2)
L: Light preload (for triple/quadruple units only)
Selection Key Points Summary
First determine the series: 718/719/70/72
Then determine the design: CD/ACD (high load capacity) or CE/ACE (high speed) or FW (sealing) or AB (UltraFast)
Confirm the seal: Select the S prefix for lifetime lubrication
Optional suffixes: Material HC, Preload GA/GB/GC, Accuracy P4/P4A, Arrangement DB/DF/DT/QBC
🛠️ What is the mounting procedure for 7008CEGB/P4A 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 7008CEGB/P4A 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.