50BNR19DB Factory Pre-Matched DB Back-To-Back Duplex 18° Angular Contact Bearing 50x72x24mm High Speed CNC Spindle

The 50BNR19DB is factory pre-matched back-to-back duplex ultra-high speed angular contact ball bearing, belonging to BNR19 series with 18° small contact angle for ultra-high limiting speed. The DB back-to-back arrangement delivers excellent axial rigidity and strong anti-overturn performance, specially developed for high-speed precision machine tool spindles requiring bidirectional axial load support and low heat generation.

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Model: 50BNR19DB

Single Bearing Inner Diameter (ID): 50mm

Single Bearing Outer Diameter (OD): 72mm

Single Bearing Width: 12mm

Duplex Set Total Width: 24mm

Min Fillet Radius r: 0.6mm

Min Fillet Radius r1: 0.3mm

Contact Angle: 18° ultra high speed angle

Pairing Arrangement: DB back-to-back duplex matched set

Structure: Single row open ultra-high speed angular contact ball bearing, two-piece factory pre-paired

Cage Type: Outer ring guided resin cage

Material: GCr15 high carbon chromium bearing steel

Basic Dynamic Load Cr (single): 12800N

Basic Static Load C0r (single): 9750N

Permissible Single Axial Load: 9100N

Grease Limiting Speed (single): 29600rpm

Oil Limiting Speed (single): 46000rpm

Approximate Net Weight of Duplex Set: 0.222kg

Operating Temperature Range: -30℃ ~ +130℃

Gear Type (if any): None

👉 Full technical data and drawings available upon request

18° small contact angle greatly reduces friction heat generation, supports continuous ultra-high speed spindle operation

DB back-to-back duplex pairing widens load action distance, outstanding axial rigidity and anti-tilting performance to resist overturning moment

Factory unified pre-matching eliminates on-site pairing errors, stable consistent preload and rotational precision

Outer ring guided resin cage lowers rotation inertia, suppresses temperature rise under long-hour high-speed running

Superfinished ultra-precision raceway and steel balls minimize vibration, runout and noise for high-precision machining

Multiple customizable options: ceramic ball high-speed version, V1V non-contact sealed type, P2/P4 ultra-precision grade, medium/heavy preload

Standard metric precision size, fully interchangeable with mainstream high-speed spindle replacement bearings

👉 Improves spindle processing finish, reduces thermal deformation and extends continuous service cycle of precision equipment

This DB duplex ultra-high speed precision bearing is widely used in:

CNC machining center high-speed main spindle rotary support assemblies

Precision internal grinders, high-speed engraving and milling machine spindles

High-speed automated testing equipment and optical precision rotary positioning shafts

Small high-speed precision motors and mold processing high-speed spindle units

👉 Ideal for customers looking for high-rigidity ultra-high speed duplex spindle bearing solutions

25+ years experience in ultra-high speed duplex precision angular contact ball bearing manufacturing

Exported to many countries worldwide

Rich OEM bulk order experience for pre-matched DB spindle bearing sets

Strict full-process preload consistency, rotational runout and high-speed temperature rise inspection before shipment

Fast professional engineer technical response within 24 hours

Stable mass supply for long-term precision machine tool and automation equipment factory cooperation

👉 We focus on stable low-heat high-rigidity ultra-high speed rotation performance and reliable long-term partnership

GCr15 bearing steel raw material composition and hardness inspection

Ultra-precision superfinishing grinding for 18° angular raceway and steel balls

Standard quenching & tempering heat treatment control

DB duplex pairing preload test, clearance grouping and high-speed aging temperature detection

Full dimensional final inspection and independent dust-proof anti-rust packaging for duplex sets

👉 Ensuring consistent smooth high-rigidity ultra-low heat high-speed rotation performance for every bearing set

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Looking for a reliable factory pre-matched DB back-to-back 18° ultra-high speed duplex spindle bearing supplier?

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Fast quotation within 24 hours

Professional engineer technical support

Custom preload grade, ceramic ball, sealed and high precision solution suggestions

Competitive factory wholesale price

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