90BNR10XDB DB Back-to-Back Matched 18° Contact Angle Ultra High Speed Precision Angular Contact Ball Bearing Set 90×140×24mm For CNC Milling Machine Main Spindle

90BNR10XDB is a DB back-to-back pre-matched double set ultra-high speed precision angular contact ball bearing, belonging to NSK ROBUST BNR series with 18° contact angle, dimension 90×140×24mm. X stands for silicon nitride ceramic balls, DB means back-to-back pairing for high rigidity. It bears heavy radial and bidirectional axial loads, low heat generation and ultra-high rotational speed, specially matched for high-precision CNC machine tool spindles, widely used in high-speed machining centers under long continuous running conditions.

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• Model: 90BNR10XDB
• Inner Diameter (ID): 90mm
• Outer Diameter (OD): 140mm
• Single Bearing Width: 24mm
• Contact Angle: 18° (BNR series)
• Structure: DB back-to-back matched set, silicon nitride ceramic balls, outer ring guided PPS resin cage, high precision P4 grade
• Material: Ring: GCr15 bearing steel; Rolling element: Si3N4 ceramic ball
• Dynamic Load Rating Cr: 35kN
• Static Load Rating C0r: 33kN
• Grease Limit Speed: 17400 r/min; Oil Limit Speed: 26400 r/min
• Single Weight: 1.24kg
• Minimum Fillet r: 1.5mm

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• DB back-to-back matching structure provides excellent tilting rigidity, strong resistance to overturning moment for spindle cutting
• X ceramic rolling elements reduce centrifugal force at high speed, lower temperature rise and extend service life
• 18° small contact angle balances high speed performance and axial bearing capacity, ideal for high-speed light-medium cutting
• Outer ring guided PPS cage stable under ultra-high rotation speed, low friction and low noise
• Factory pre-matched with standardized EL/L/M/H preload options, no on-site clearance adjustment needed
• Support customized preload grade, OEM laser marking and anti-rust export packaging

???? Reduce spindle maintenance frequency and improve machining precision & efficiency

This matched bearing set is widely used in:

• Vertical & horizontal CNC machining center main spindles
• High-speed milling, engraving and grinding machine spindles
• Precision high-speed motor spindles for mold processing
• Automated precision metal cutting equipment

???? Ideal solution for customers pursuing high precision, high speed and long spindle life

• 25+ years experience manufacturing ultra-high speed precision spindle bearings
• Complete stock of BNR/BER series single & DB/DF/DT matched bearing assemblies
• Strict pairing tolerance control, consistent preload rigidity for every DB set
• 100 dimensional, noise, high-speed temperature rise testing before shipment
• Professional spindle matching technical support within 24 hours
• Stable bulk supply for machine tool factories and spindle manufacturers

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• Raw material chemical composition & hardness inspection
• Precision internal/external grinding & low-temperature heat treatment control
• Ceramic ball roundness & surface finish inspection
• DB back-to-back pairing rigidity & preload calibration test
• High-speed endurance temperature rise test
• Final anti-rust oil & fumigated wooden box packaging inspection before delivery

???? Ensuring consistent stable precision performance for every bearing set

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• Fast quotation within 24 hours
• Engineer technical support for spindle model matching
• Custom preload grade service
• Competitive factory bulk wholesale price

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