Deep Groove Ball Bearings 61812-2RS1 SKF

The SKF 61812-2RS1 is a high-precision, thin-section deep groove ball bearing, engineered for compact design requirements with robust load-bearing capabilities. Fully compliant with ISO 492 and ISO 355 standards, its suffixes denote key specifications: 2RS1 indicates double-layer contact seals made of nitrile rubber (NBR), providing exceptional protection against dust and moisture. Distinguished by its lightweight yet rigid structure, it excels in high-speed stability and environmental adaptability, making it an ideal choice for precision machinery and general industrial applications where space conservation and reliability are paramount.

1. Detailed Dimensional Parameters

Conforming to international bearing standards, the 61812-2RS1 features an inner diameter (d) of 60mm, an outer diameter (D) of 78mm, and a width (B) of 10mm. The minimum chamfer size (r) is 0.6mm, with a single weight of only 0.11kg. It adheres to P0 tolerance grade (ISO 492), ensuring consistent dimensional accuracy for general-purpose applications. Its basic dynamic load rating (C) is 16.0kN, and the basic static load rating (C₀) is 11.2kN, delivering reliable load capacity within a compact form factor. The optimized thin-section design minimizes rotational inertia, making it suitable for high-speed operations.

2. Specific Material Description

• Bearing Components: The inner ring, outer ring, and chrome steel balls are manufactured from high-carbon chromium bearing steel (AISI 52100/SUJ2), refined via vacuum degassing to minimize non-metallic inclusions. Following precision heat treatment, they achieve a hardness of 60-64 HRC, offering excellent wear resistance, fatigue strength, and dimensional stability under cyclic loading.

• Cage: Constructed from glass fiber-reinforced polyamide (PA66+GF), the one-piece cage ensures smooth rolling element guidance, low friction, and heat resistance, maintaining stability even at elevated temperatures.

• Sealing System: The 2RS1 double contact seals are fabricated from nitrile rubber (NBR), featuring high elasticity and resistance to oil, dust, and moisture. This design creates a reliable barrier against environmental contaminants, extending service life in harsh operating conditions.

3. Core Processing Technology

Manufactured to SKF’s stringent quality standards, the bearing undergoes a series of precision processes:

• Closed-Die Forging: Produces a dense internal structure with continuous metal fiber flow, enhancing load-bearing capacity and fatigue resistance.

• CNC Turning & Grinding: Achieves ultra-precise dimensional control with a raceway surface roughness of Ra ≤ 0.32μm, ensuring smooth rotation and minimal noise.

• Controlled Atmosphere Heat Treatment: Utilizes a nitrogen-hydrogen protective atmosphere to prevent oxidation and decarburization, guaranteeing uniform hardness distribution across all components.

• Superfinishing: Refines the raceway surface to Ra ≤ 0.05μm, reducing friction, wear, and heat generation, thereby extending operational lifespan.

• Seal Assembly: Precision-molded NBR seals are installed with interference fits to ensure airtightness and durability, maintaining effective protection throughout the bearing’s service life.

4. Service Life

Under standard operating conditions—2500r/min, a radial load of 5kN, proper lubrication, and a clean environment—the bearing’s L₁₀ basic rated life (90% reliability) is 32,000 operating hours, calculated in accordance with ISO 281:2007. Key factors influencing service life include lubrication quality, contamination levels, installation accuracy, and load magnitude. Insufficient lubrication or exposure to excessive dust/moisture can reduce service life by 30-50%, while proper maintenance and environmental control can significantly extend its operational life.

5. Application Scenarios and Industries

Widely applied in compact machinery and precision equipment, the SKF 61812-2RS1 is ideal for:

• General Industrial Equipment: Small electric motors, pumps, compressors, and gearboxes

• Automotive Components: Automotive accessory drives, power steering systems, and transmission parts

• Electronics & Instrumentation: Precision machinery, medical equipment, and robotics

• Wind Power & Renewable Energy: Small-scale wind turbine generators and tracking systems

• Food & Beverage Processing: Hygienic-grade machinery requiring sealed protection

Its suitability stems from the thin-section design (saving space), 2RS1 dual seals (environmental protection), and high load capacity-to-weight ratio, making it a versatile solution for applications demanding reliability and compactness.

6. Basic Maintenance Requirements

• Maintenance Cycle: 2000 operating hours for general applications; extend to 3000 hours in clean, low-contamination environments.

• Lubrication: Use lithium-based grease (NLGI 2) with a filling amount of 15-25% of the bearing’s free space. Re-lubricate every 1500-2000 hours. For high-speed operations, opt for low-viscosity grease to minimize friction.

• Cleaning: Remove dust and old grease with clean kerosene or isopropyl alcohol; avoid harsh chemicals that could damage the seals. Ensure thorough drying before reapplication.

• Inspection: Regularly check for abnormal noise, temperature rise, or grease leakage. Replace the seals immediately if damaged, and inspect the raceways and balls for wear if vibration increases.

7. Installation Precautions

• Pre-Installation: Keep the installation area clean; remove burrs from the shaft and housing, and verify dimensional compatibility (shaft tolerance: h6/h7). Store bearings in a dry, dust-free environment to prevent seal damage.

• Installation: Apply a thin film of lubricant to the shaft and bearing inner ring for easy fitting. Press the bearing onto the shaft using a press (avoid hammering) to prevent raceway damage. Ensure coaxiality tolerance ≤ 0.02mm to avoid misalignment.

• Fastening Torque: Tighten housing bolts to 40-60N·m in a diagonal sequence for uniform load distribution.

• Post-Installation: Rotate the bearing manually to check for smooth rotation (no jamming). Measure operating temperature after 30 minutes (normal ≤ 70℃).

• Safety: Wear protective gloves and goggles during handling; avoid direct contact with sharp edges or raceways. Use specialized lifting tools to prevent bearing distortion.