KFB Germany Angular Contact Ball Bearings: Types, Features, and Applications
Angular contact ball bearings play a critical role in machinery that requires high precision, load-bearing capacity, and durability. KFB Clarfeld Germany is a renowned manufacturer of these bearings, offering a comprehensive range designed to meet diverse industrial applications. Their angular contact ball bearings excel in handling combined radial and axial loads and delivering reliable performance under high-speed conditions.
This article provides an in-depth exploration of KFB Germany’s single-row angular contact ball bearings, covering their types, features, construction variations, tolerance designs, applications, and installation requirements. With their advanced engineering and stringent quality standards, these bearings are ideal for industries ranging from manufacturing and robotics to aerospace and automotive.
KFB Germany offers a comprehensive portfolio of Angular Contact Ball Bearings (ACBB) engineered to meet stringent industrial requirements across multiple sectors. These bearings are produced in various series, contact angles, preload classes, and cage materials, each optimized for specific operating conditions.
▶ Series Classification & Application Scope
General-Purpose Series:
72B and 73B Series: These bearings are designed with a 40° contact angle (designation B) and are suitable for applications involving combined radial and axial loads at high speeds. Typical use cases include pumps, gearboxes, and industrial transmission systems.
Precision & Tooling Series:
Series 718, 719, 70, and 72: Tailored for high-precision tool-holding and spindle assemblies. These series feature contact angles of 15° (C) and 25° (A), with tolerance classes conforming to ISO P5, P4, and P2 standards. Cages are manufactured from textolite (phenolic resin) or machined brass, enabling reduced mass and enhanced stability at high RPM.
▶ Functional Design Characteristics
Contact Angles:
40° (B): Supports elevated axial loads and provides increased axial rigidity.
25° (A): Balanced axial and radial load handling; commonly used in general precision equipment.
15° (C): Optimized for ultra-high-speed and high-precision performance; minimal deformation under axial stress.
Cage Materials:
Phenolic Resin (Textolite): Lightweight and dimensionally stable, ideal for high-speed tool spindles.
Machined Brass: High strength, excellent wear resistance, and compatibility with oil lubrication under extreme conditions.
Preload Options:
Suffixes GA, GB, GC represent light, medium, and heavy preload conditions, respectively, crucial for eliminating clearance, enhancing rigidity, and controlling vibration.
Radial Clearance Variants:
Denoted by suffixes CA, CB, CC, specifying radial internal clearance classes (C2, CN, C3) tailored to thermal and load-induced expansion conditions.
▶ Mounting Configurations
DB (Back-to-Back): Offers maximum moment load resistance and axial stiffness; axial loads diverge outward.
DF (Face-to-Face): Tolerates slight misalignment; axial loads converge inward.
DT (Tandem): Used to enhance unidirectional axial load capacity by distributing load over multiple bearings.
DB (Back-to-Back): Offers maximum moment load resistance and axial stiffness; axial loads diverge outward.
DF (Face-to-Face): Tolerates slight misalignment; axial loads converge inward.
DT (Tandem): Used to enhance unidirectional axial load capacity by distributing load over multiple bearings.
Universal Matching:
Bearings with suffixes UA, UO, UL are manufactured for combination into DB, DF, or DT arrangements without the need for manual clearance adjustment.
▶ ISO & Dimensional Compliance
All KFB ACBBs comply with ISO 15 dimensional standards. Bore and outer diameter tolerances adhere to ISO P4, P5, P6 classes, ensuring exceptional concentricity, roundness, and running accuracy.
▶ Load Ratings & Speed Performance
Dynamic Load Rating (Cr) and Static Load Rating (C0) are defined per ISO 281 and reflect bearing capability under defined radial and axial conditions.
High-speed series (e.g., 72B, 73B) are optimized using reduced contact angles and lightweight cages. Speed ratings are further modified by preload level and arrangement type.
Dynamic Load Rating (Cr) and Static Load Rating (C0) are defined per ISO 281 and reflect bearing capability under defined radial and axial conditions.
High-speed series (e.g., 72B, 73B) are optimized using reduced contact angles and lightweight cages. Speed ratings are further modified by preload level and arrangement type.
▶ Installation Guidelines
Shaft Fits: Tolerance class J5
Housing Fits: Tolerance class J6
Chamfer Requirements: Mounting chamfers must exceed the bearing corner radius.
Alignment Considerations: Misalignment in DB arrangements can lead to increased internal stress and premature fatigue.
Shaft Fits: Tolerance class J5
Housing Fits: Tolerance class J6
Chamfer Requirements: Mounting chamfers must exceed the bearing corner radius.
Alignment Considerations: Misalignment in DB arrangements can lead to increased internal stress and premature fatigue.
▶ Key Industry Applications
Aerospace: Utilized in turbine engines and actuation systems for their high-temperature tolerance and axial load capacity.
Automotive: Applied in transmission units, electric motors, and wheel-end systems; benefits include reduced torque and improved energy efficiency.
Precision Machinery: Deployed in CNC spindles and tool holders requiring ultra-low vibration and exacting rotational accuracy.
Heavy Equipment: GC preloaded bearings with extended contact angles operate reliably under dust, shock loads, and vibration in mining and construction equipment.
Automation & Robotics: Ideal for servo mechanisms, robotic joints, and high-speed pick-and-place systems.
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