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Oct . 16, 2025 11:55 Back to list

204714mm 6204-2RS C3 Deep Groove Ball Bearing, Sealed


A Field Note on a Workhorse: the 6204-2RS C3 Deep Groove Ball Bearing

If you build or repair motors, conveyors or small gearboxes, you’ve met the 204714mm 6204-2RS C3 deep groove ball bearing. I’ve watched this little unit outlast pulleys and housings, which, to be honest, is always a bit satisfying. It comes from an address that’s become familiar in bearing circles: No. 3, Area B, Bearing Industry Mass Entrepreneurship Park, Beihuan Road, Linxi County, Xingtai City, Hebei Province—an ecosystem where machining and metallurgy are the local language.

204714mm 6204-2RS C3 Deep Groove Ball Bearing, Sealed

Why it still matters

The 204714mm 6204-2RS C3 deep groove ball bearing is the “default” for compact powertrains. Sealed both sides (2RS), with C3 internal clearance for thermal growth and misalignment forgiveness—ideal for electric motors that get warm under duty. Many customers say it feels “quiet but not delicate,” which is a nice way of saying it handles real-world abuse.

Typical specifications (real-world use may vary)

Item Spec ≈
Bore × OD × Width20 × 47 × 14 mm
Type / Clearance6204-2RS / C3
MaterialGCr15 (AISI 52100) rings/balls; NBR seals; steel or PA66 cage (on request)
Dynamic / Static loadC ≈ 13.5 kN; Co ≈ 7.8 kN [1][3]
Limiting speed (grease/oil)≈ 12,000 / 17,000 rpm
Noise / vibration classV2 per ISO 15242 (typical batch)
Operating temp-20 to +110 °C (grease dependent)
Grease fill≈ 25–35% NLGI 2 lithium EP
204714mm 6204-2RS C3 Deep Groove Ball Bearing, Sealed

Where it’s used

  • Electric motors, fans, HVAC blowers (C3 is a safe bet as windings heat up)
  • Power tools, conveyors, small pumps, and gear motors
  • Two-wheeler hubs, e-scooters, agricultural implements

Manufacturing flow (short version)

Steel selection → Turning → Through-hardening (HRC 60–64) → Sub-zero stabilization → Superfinishing/grinding (raceway roundness checked) → Cleanroom assembly → Grease metering → Seal press-fit → 100% noise/vibration test per ISO 15242 → Packaging. It sounds linear; in practice, the in-process gauging is where good bearings are made.

Testing and service life

  • Life calculation per ISO 281 (L10). At 2.0 kN radial and 1,800 rpm, L10 projects ≈ 36,000 h [1].
  • Static load check per ISO 76; safety factor kept ≥ 1.5 in our audits [3].
  • Noise spectra logged (1–10 kHz bands) and graded V2/V3 [2].
  • Grease endurance: ASTM D3336 screening; practical results vary by duty [5].

Customization options

The 204714mm 6204-2RS C3 deep groove ball bearing can be ordered with ZZ shields, non-contact seals, alternative greases (low-noise, high-temp, food-grade), clearances C0/C4, cages (steel or polymer), and tighter tolerances (P6/P5) for high-speed motors.

Vendor comparison (quick reality check)

Factor BTZ Bearing (Hebei) Global Brand A Budget Import B
CertsISO 9001; IATF 16949IATF 16949, extensiveVaries/limited
Lead time2–4 weeks4–8 weeksStock or 1–2 weeks
CustomizationHigh (grease/seal/clearance)MediumLow
Noise controlV2 typical; V3 availableV3/V4Unspecified
PriceMidHighLow

Mini case study

A regional conveyor OEM swapped legacy 6204 units for the 204714mm 6204-2RS C3 deep groove ball bearing with low-noise grease. Field data over six months: average motor current dropped ≈ 3%, audible noise down ≈ 2–3 dB, projected L10 life up ≈ 18% (lighter loads than spec, to be fair). Their maintenance lead told me, “Honestly, we just stopped hearing them.”

204714mm 6204-2RS C3 Deep Groove Ball Bearing, Sealed

Customer feedback

  • “Surprisingly quiet for sealed bearings.”
  • “C3 clearance solved our thermal expansion issue in blower motors.”
  • “Lead times were reasonable; custom grease fill helped at low temps.”

Certifications and compliance

Produced under ISO 9001 quality systems; automotive projects audited to IATF 16949. RoHS compliant materials available. Batch test records (vibration plots, dimensional reports) can be supplied on request.

Quick buying notes

  • Match clearance to thermal profile (C3 for warm-running motors is usually right).
  • Pick grease for duty: low-noise for appliances; EP for conveyors; high-temp for ovens.
  • If your speed is near the limit, ask for P6 tolerance and polymer cage.

References: [1] ISO 281 (rolling bearing life); [2] ISO 15242 (vibration measurement); [3] ISO 76 (static load ratings); [4] IATF 16949 (automotive QMS); [5] ASTM D3336 (grease life).

  1. ISO 281: Rolling bearings — Dynamic load ratings and rating life.
  2. ISO 15242-1: Rolling bearings — Measuring methods for vibration.
  3. ISO 76: Rolling bearings — Static load ratings.
  4. IATF 16949: Quality Management System for automotive production.
  5. ASTM D3336: Standard Test Method for Life of Lubricating Greases in Ball Bearings at Elevated Temperatures.
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