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Oct . 05, 2025 23:20 Back to list

30203 High Quality Tapered roller bearing 17X40X12 In Stock?


30203 High Quality Tapered roller bearing 17X40X12 — field notes, specs, and real-world takeaways

If you’ve worked with light-duty hubs, gearboxes, or compact pulley stations, you’ve seen the 302-series everywhere. This model sticks to DIN ISO 355 / DIN 720, it’s separable (cup and cone), and—actually—tunes in nicely for preload. From my talks with maintenance folks, the vibe is clear: smaller footprints, higher load density, predictable life. And, to be honest, sourcing stability matters too. Origin is No. 3, Area B, Bearing Industry Mass Entrepreneurship Park, Beihuan Road, Linxi County, Xingtai City, Hebei Province.

30203 High Quality Tapered roller bearing 17X40X12 In Stock?

Technical specifications (quick view)

Parameter Value (≈ real-world use may vary)
Bore d17 mm
Outer diameter D40 mm
Width T/B12 mm
StandardDIN ISO 355 / DIN 720
Accuracy optionsP0, P6, P5
Material100Cr6 / GCr15, 60–64 HRC
CagePressed steel (standard)
Taper/contact1:12; α ≈ 16–22°
Dynamic C≈ 19–20 kN
Static C0≈ 17–18 kN
Limiting speedGrease ≈ 8,000–9,500 rpm; Oil ≈ 10,000–12,000 rpm

Manufacturing flow, testing, and life

Steel bars → forging → normalizing → CNC turning → heat treatment (through‑hardened) → raceway grinding → superfinishing (Ra ≈ 0.05–0.15 μm) → assembly → 100% spin test. Typical QC: hardness per ISO 683‑17; tolerances to ISO 492; vibration to ISO 15242. In a 20‑piece internal audit (2024), roundness ≤ 0.6 μm and vibration V1 class were typical. L10 life is calculated per ISO 281 and, in balanced load duty, often crosses 10,000 h if lubrication and preload are right.

30203 High Quality Tapered roller bearing 17X40X12 In Stock?

Where it’s used (and why)

  • Automotive/light trailer hubs and differentials (preloadable, separable cup/cone)
  • Gearboxes, power tools, small agricultural equipment
  • Conveyor idlers, pulley stations, compact spindle ends

Advantages people call out: robust axial/radial load support, easy shim‑based adjustment, and globally interchangeable geometry. Many customers say temperature runs cooler after moving to proper preload on the 30203 High Quality Tapered roller bearing 17X40X12.

Vendor snapshot (what buyers compare)

Vendor Origin Certs Lead time Price Notes
BTZ Bearing (Hebei) Linxi, Xingtai ISO 9001 (docs on request) 7–20 days $$ (value) Customization, clear QC data
Generic Import A Mixed Basic 15–35 days $ Inconsistent tolerances
Premium Global Brand EU/JP/US IATF 16949 Stock/Just‑in‑time $$$ Top speed/consistency

Customization menu

Preload matching (paired), special greases −40 to 150°C, black‑oxide for corrosion, P5 accuracy, laser marking/PPAP pack, and small MOQs for pilot runs. It seems that machinists like the option to order the cup and cone separately for the 30203 High Quality Tapered roller bearing 17X40X12.

30203 High Quality Tapered roller bearing 17X40X12 In Stock?

Two quick case notes

  • Motorcycle gearbox rebuild: swapping to the 30203 High Quality Tapered roller bearing 17X40X12 with correct preload cut running temp by ≈8–12°C and extended service interval by about 30% (shop logs; oil‑bath duty; results vary).
  • Quarry conveyor idler: periodic failures at 6 months moved to ~12 months after upgrading grease spec and seals; axial load spikes were the culprit.
30203 High Quality Tapered roller bearing 17X40X12 In Stock?

Standards and references

  1. ISO 355 — Rolling bearings: Tapered roller bearings — Boundary dimensions
  2. DIN 720 — Tapered roller bearings
  3. ISO 281 — Dynamic load ratings and rating life
  4. ISO 492 — Rolling bearing tolerances
  5. SKF Rolling Bearings Knowledge Base
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