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Oct . 21, 2025 12:15 Back to list

Cylindrical Roller Bearing | High Load, Low Friction

What I’m Seeing in Cylindrical Roller Bearings Right Now

If you’ve been around rotating equipment as long as I have, you know a Cylindrical Roller Bearing can make or break uptime. And lately, “long” roller formats have been getting attention for compact gearboxes and motors where radial space is tight. Yes, the catalog sometimes blurs with needle-style language, but the point stands: long rollers, slim profiles, high radial capacity. Actually useful in the real world.

Cylindrical Roller Bearing | High Load, Low Friction

Product snapshot: Long Cylindrical Roller Bearings

Origin: XIHUAN ROAD, HEXI TOWN, LINXI COUNTY, HEBEI PROVINCE, CHINA. Many customers say they chose this line for tight housings and consistent running accuracy; I’ve seen them go into compact reducers without drama. To be honest, the low heat rise at moderate speeds is what surprised me.

Key specifications (typical)

Bore range (d)≈ 20–200 mm (custom up to 260 mm)
Outer diameter (D)≈ 40–300 mm
Width (B)≈ 15–120 mm
Dynamic load rating (C)≈ 35–820 kN (real-world use may vary)
Speed capabilityGrease up to ≈ 4,500 rpm; Oil up to ≈ 6,500 rpm (size-dependent)
Clearance classesC2, CN, C3 (others on request)
AccuracyISO 492 P0/P6/P5
MaterialsRings/rollers: 100Cr6 (AISI 52100) or equivalent; Cages: brass/steel/polyamide

Process flow and testing

Steel sourcing → Forging → Turning → Heat treatment (martensitic, hardness ≈ 60–64 HRC) → Precision grinding → Superfinishing (Ra ≈ 0.02–0.05 μm on raceways) → Assembly → 100% dimensional and noise testing. Tests reference ISO 76 (static), ISO 281 (life), and ISO 492 (tolerances). Routine checks include roundness ≤ 2 μm (select classes), vibration per GB/T 307.1. Sample bench data I saw last quarter: temperature rise at 3,000 rpm/2 kN load ≈ 7–9°C with NLGI-2 lithium grease; vibration velocity ≈ 0.8 mm/s RMS at CN clearance.

Where they fit

- Gearboxes and industrial reducers; - Electric motors and servos; - Paper machines; - Compressor shafts; - Mining conveyors. If axial location is needed, pair a Cylindrical Roller Bearing NU/NJ type with a fixed shoulder arrangement, or mix with a thrust element. Lubrication: quality ISO VG 46–68 oil or NLGI-2 grease; re-lube intervals per duty cycle.

Advantages I’ve noticed

- High radial capacity in a compact envelope (the long-roller geometry earns its keep).
- Lower heat at mid-range speeds compared with some tapered options.
- Customizable clearance and cage for temperature or speed focus. Many customers say noise dropped ≈ 1.5 dB after switching.

Vendor landscape (quick take)

Vendor Certs Lead time Customization Typical price level
ARY Bearing (Hebei) ISO 9001; IATF 16949 (on select lines) ≈ 2–5 weeks Bore, clearance, cage, coatings Value-focused
SKF Global ISO/IATF network Stock to 6 weeks Broad, incl. special steels Premium
NSK ISO/IATF; plant-specific ≈ 3–8 weeks High-precision P5/P4 focus Premium

Customization notes

Options include black-oxide rings for corrosion start-up protection, optimized roller crown for edge stress, C3/C4 clearance for higher temperature, and polyamide cages for quieter duty. For high axial float, a floating Cylindrical Roller Bearing with no shoulders in one ring (N type) is handy.

Case study (condensed)

Steel mill gearbox rebuild: swapped older NU2xx units with long-roller Cylindrical Roller Bearing equivalents. After alignment and oil upgrade to ISO VG 68, mean time between failures improved ≈ 18%, with temperature drop ≈ 6°C. Not magic—just better load distribution and surface finish.

Service life and compliance

Calculated L10 life per ISO 281 is application-specific; in clean oil with proper alignment, I’d expect ≈ 20,000–60,000 h. Conforms to ISO 492 for tolerances. Material per ASTM A295 (52100) equivalents; failures classified using ISO 15243 for root-cause reviews.

References

  1. ISO 281: Rolling bearings — Dynamic load ratings and rating life.
  2. ISO 492: Rolling bearings — Radial bearings — Tolerances.
  3. ISO 76: Rolling bearings — Static load ratings.
  4. ASTM A295/A295M: Standard Specification for High-Carbon Anti-Friction Bearing Steel.
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