Cylindrical Roller Bearing N418M/C3 SKF

The SKF N418M/C3 is a high-performance single-row cylindrical roller bearing, engineered for heavy radial loads and moderate-to-high speed operations. It fully complies with ISO 355 and DIN 628 standards, with suffixes denoting key configurations: M for brass solid cage and C3 for increased radial internal clearance, which adapts to thermal expansion in high-temperature working conditions. Its unique design combines high load-bearing capacity and stable rotational performance, distinguishing itself from ordinary cylindrical roller bearings with excellent durability and adaptability to harsh industrial environments.

1. Detailed Dimensional Parameters: Conforming to international bearing standards, the bearing has an inner diameter (d) of 90mm, outer diameter (D) of 225mm, and width (B) of 54mm. The minimum chamfer size (rₘᵢₙ) is 3.0mm, single weight is 11.7kg. Its tolerance grade is P0 (ISO 492), with inner/outer diameter tolerance of IT6 and width tolerance of IT7. The basic dynamic load rating is 315kN, basic static load rating is 340kN, reference speed (grease lubrication) is 3800r/min, and limiting speed (oil lubrication) is 5200r/min. The C3 radial internal clearance (0.075-0.130mm) effectively accommodates thermal expansion during operation.

2. Specific Material Description: Inner ring, outer ring and cylindrical rollers are made of high-carbon chromium bearing steel (AISI 52100/SUJ2), refined by vacuum degassing technology to reduce non-metallic inclusions and improve material uniformity. After precision heat treatment, it reaches a hardness of 61-65 HRC, featuring excellent wear resistance, high fatigue strength and stable dimensional accuracy under long-term cyclic loading. The retainer (suffix M) is brass (H62) solid cage, with good thermal conductivity, impact resistance and wear resistance, ensuring stable roller guidance and reducing friction at high speeds. Optional stainless steel (SUS440C) components are available for corrosive environments.

3. Core Processing Technology: Key manufacturing processes follow SKF’s stringent quality standards: closed-die forging, CNC turning, controlled atmosphere heat treatment, precision grinding and superfinishing. Closed-die forging ensures dense internal structure and continuous metal fiber distribution, enhancing overall bearing strength. CNC turning achieves Ra ≤ 0.3μm surface roughness, ensuring precise dimensional control. Heat treatment adopts nitrogen-hydrogen protective atmosphere to avoid oxidation and decarburization, ensuring uniform hardness distribution. Precision grinding with CBN砂轮 and superfinishing reduce raceway roughness to Ra ≤ 0.04μm, minimizing friction and extending service life.

4. Service Life: Under standard working conditions (2800r/min, radial load 100kN, proper lubrication and clean environment), the L₁₀ basic rated life (90% reliability) is 16,000 operating hours, calculated in accordance with ISO 281:2007 standard. Key influencing factors include lubrication quality, pollution level, installation accuracy and load magnitude; insufficient lubrication or excessive contamination can reduce service life by 30-50%, while overload operation may cause premature bearing damage.

5. Application Scenarios and Industries: Widely used in heavy industrial sectors, including machinery manufacturing, mining, power generation, engineering machinery and rolling mills. Typical applications include large electric motors, gearboxes, rolling mill equipment, crushers and conveyor systems. It is suitable for these scenarios due to its high radial load capacity, C3 clearance for thermal adaptability, and brass cage for stable high-speed operation, adapting to heavy-duty, high-temperature and moderate-speed working conditions.

6. Basic Maintenance Requirements: Maintenance cycle is 2000 operating hours. Lubrication: Use lithium-based grease (NLGI 2) or extreme pressure gear oil (ISO VG 68), filling amount 15-30% of the bearing’s free space; re-lubricate every 1500-2000 hours. Cleaning: Remove dust and old grease with clean kerosene; avoid corrosive cleaners and ensure thorough drying. Regular inspection: Check for abnormal noise, temperature rise and grease leakage; replace lubricant immediately if it deteriorates, and inspect for roller or raceway wear if vibration increases.

7. Installation Precautions: Pre-installation: Keep the installation area clean; remove burrs from the shaft and housing, and verify fitting surface roughness (Ra ≤ 0.8μm). Installation: Apply a thin oil film to fitting surfaces; use a press to apply force evenly on the inner ring (avoid hammering). Ensure coaxiality tolerance ≤ 0.02mm. Fastening torque: 150-180N·m for bearing seat bolts. Post-installation: Rotate manually to check for jamming; measure temperature after 30 minutes (normal ≤ 72℃). Safety: Wear protective gloves and goggles; use specialized lifting tools for handling, avoiding direct contact with raceways.