31308‑DF.A50‑90 Tapered Roller Bearing Set 40×90×50.5mm for Rigid Shaft Support

31308‑DF.A50‑90 is factory back‑to‑back(DF/O‑type) matched tapered roller bearing set, made up of two 31308 single tapered roller bearings. It comes with preset A50‑90 preload. This unit can support combined radial and bidirectional axial loads, delivers high rigidity for precision industrial transmission equipment.

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• DF back‑to‑back matched pair, factory preset A50‑90 pre‑load
• Handles heavy radial and bidirectional axial loads simultaneously
• High system rigidity, resists shaft deflection under complex load conditions
• Matched pair supplied as complete unit, reduces on‑site adjustment work
• Open‑type design, compatible with grease and oil lubrication

• Precision industrial gearboxes and heavy‑duty reducer assemblies
• Machine tool spindle and rigid shaft support structures
• Construction machinery power transmission components
• Industrial equipment requiring bidirectional axial positioning

*Ready stock. Short lead time. Fast delivery. Send us your bearing list and let’s get started!

• 30 years professional bearing industry experience
• ISO certified strict quality inspection
• Flexible OEM & private label customization
• 3-5 days fast delivery for stocked bearings
• Full bearing series, universal interchangeable size
• Factory direct price & reliable after-sales service

*Need custom bearings? Share your drawings, specifications or requirements — we’ll find the right solution for you.