NN3017K Double Row Cylindrical Roller Bearing 1:12 Tapered Inner Bore 85x130x34mm CNC Precision Spindle Equipment

NN3017K is double row precision cylindrical roller bearing with 1:12 tapered inner bore, dimension 85×130×34mm. Double symmetric roller rows deliver ultra-high radial rigidity, zero axial displacement during rotation. K suffix represents tapered bore to fit adapter sleeve, easy clearance adjustment for spindle preload. Separable outer ring simplifies installation, superfinished raceway ensures low vibration and high-speed stable running. Widely used in CNC lathe spindles, surface grinders, machining center main shafts and precision high-speed rotary equipment.

Model:

NN3017K

Inner Diameter d:

85mm

Outer Diameter D:

130mm

Width B:

34mm

Min Fillet r:

1.5mm

Structure:

Double row cylindrical roller bearing, double ribs on outer ring, 1:12 tapered inner bore

Cage:

Solid machined brass cage

Material:

GCr15 high carbon chromium bearing steel

Basic Dynamic Load Cr:

148kN

Basic Static Load C0r:

224kN

Grease Limiting Speed:

4600rpm

Oil Limiting Speed:

6100rpm

Net Weight:

Approx 1.42kg

Precision Grade:

Standard P4, P5 customizable

Matching Accessory:

Adapter sleeve H3017

• Double row roller layout provides superior radial rigidity, maintains high precision under heavy radial cutting load
• 1:12 tapered inner bore (K type) matches adapter sleeve, convenient precise preload adjustment for machine spindle
• Outer ring double ribs limit axial movement, ensure stable high-speed rotation without shifting
• Machined solid brass cage resists high centrifugal force and high temperature, no deformation during long-hour operation
• Ultra-precision superfinishing reduces noise and heat generation, ideal for continuous CNC precision machining
• Two structural options: tapered bore NN3017K and straight bore NN3017 for different spindle assembly demands
• Customizable C3 clearance for high-temperature high-speed heavy-duty spindle working conditions

• This NN3017K double row tapered bore precision bearing is widely matched to:
• CNC vertical & horizontal lathe main spindle support assemblies
• Surface grinders, internal grinders and precision machining center rotary shafts
• High-speed engraving machines, precision testing equipment rotary positioning parts
• General high-rigidity precision machinery requiring heavy radial load and adjustable preload
• All machine tool spindles needing easy clearance tuning via adapter sleeves

• 25+ years experience in NN3000 series double row precision cylindrical roller bearing manufacturing
• Exported to 50+ countries worldwide
• Rich OEM bulk order experience for K tapered bore high-rigidity spindle bearings
• Strict P4/P5 precision tolerance, high-speed temperature rise and radial rigidity inspection before shipment
• Fast professional technical reply within 24 hours
• Stable mass supply for long-term CNC machine tool factory cooperation

• GCr15 bearing steel raw material composition & hardness inspection
• Ultra-precision grinding for inner tapered bore, outer raceway and cylindrical rollers
• Precision CNC machining for solid brass cage, smooth burr-free surface
• Standard quenching & tempering heat treatment for uniform surface hardness HRC61–65
• Radial rigidity test, high-speed aging rotation test and full dimensional recheck
• Anti-rust oil treatment + shockproof plastic box independent packaging before delivery

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