Secret - FAG Bearing Type English Suffix
FAG bearings are known for their high precision and reliability in various industrial applications. Understanding the English suffixes used in FAG bearing codes is essential for identifying the correct bearing type, its specifications, and performance characteristics. These suffixes provide detailed information about the bearing's design, materials, clearance, sealing, and other special features.
Basic Composition of the Bearing Code
The bearing code typically consists of a prefix, root code, and suffix. The prefix may indicate specific types or configurations, while the root code identifies the basic bearing type. The suffix provides additional details about the bearing’s internal layout, dimensions, sealing, and other unique features.
1. Internal Layout Suffixes
Suffixes like A, B, C, D, E denote different contact angles or internal designs. For example, angular contact ball bearings such as 7205C, 7205E, and 7205B have varying contact angles (15°, 25°, and 40° respectively). Other suffixes like VH refer to self-locking full-roll cylindrical roller bearings with non-uniform roller diameters, such as NJ2312VH.
2. Dimensional and External Layout Suffixes
Suffixes like DA, DZ, K, and others describe the bearing’s outer diameter, taper, and structural features. For instance, DA indicates a double inner ring in a double-row angular contact ball bearing, while K denotes a tapered bore with a 1:12 taper. Bearings with dust covers on both sides are marked with 2LS, and those with snap grooves are labeled N or NR.
3. Sealing and Dustproof Suffixes
RSR and 2RSR denote single and double-sided seals, respectively, while ZR and 2ZR indicate dust covers. Bearings with a stop groove on one side are labeled ZRN, and those with snap grooves on both sides are 2ZRN. ZZ refers to bearings with two retaining rings guiding the outer ring.
4. Cage and Retainer Suffixes
Cage types are indicated by letters such as F, L, M, T, and J, each representing different materials and guide types. For example, F represents a steel solid cage, while L indicates a light metal solid cage. Some suffixes, like FPB, specify window-type cages with inner ring guidance.
5. Full Complement Bearings
V and VT suffixes denote full complement bearings without a cage. V means no cage at all, while VT includes blocking balls or rollers for enhanced load capacity, such as NU207V or 51120VT.
6. Precision and Accuracy Levels
P0 through P6 indicate different levels of precision, with P0 being standard and P6 offering higher accuracy. Special codes like SP, UP, and HG represent even higher precision levels, often used in spindle bearings where accuracy is critical.
7. Clearance Suffixes
Clearance groups such as C1, C2, C3, C4, and C5 define the radial clearance of the bearing. For example, C3 indicates a larger clearance than C0, which is standard. Non-standard clearances are denoted with R (radial) or A (axial), followed by specific values in micrometers.
8. Noise Reduction and Heat Treatment Suffixes
F3 and G are used for low-noise bearings, mainly for cylindrical roller and deep groove ball bearings. Heat treatment suffixes like S0–S4 indicate the temperature resistance of the bearing rings, with S4 allowing operation up to 350°C.
9. Special Conditions and Features
Suffixes like KDA, K, ZB, and ZW refer to special manufacturing conditions, such as split inner rings, oversized cylindrical rollers, or double-row needle roller assemblies. These are often used in custom or high-performance applications.
10. Machine Tool Spindle Bearings
Spindle bearings often include suffixes like KTPA, TPA, P2, and UL, indicating specialized cage designs, high precision, and pre-interference in paired configurations. These bearings are used in CNC machines and other high-precision equipment where accuracy and stability are vital.
For more information on FAG bearings, visit China Bearing Network. If you need help identifying or selecting the right FAG bearing, feel free to reach out to our experts for personalized support.
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