NN3018MBKRCC1-P4 1:12 Taper Bore Double Row Super Precision Cylindrical Roller Bearing 90×140×37mm Solid Brass Cage For Heavy Machining Center Spindle

NN3018MBKRCC1-P4 is a high-rigidity double row cylindrical roller bearing dedicated to heavy-duty CNC spindles. It adopts 1:12 tapered inner bore (K), solid machined brass MB cage, CC1 ultra-small radial clearance and P4 super precision grade.

With inner triple rib & rib-free outer ring structure, it carries huge radial load while allowing slight axial floating of the shaft. It runs low heat and low noise under continuous heavy cutting, widely adopted on large mold processing and heavy cutting machine spindles.

👉 Get a quote within 24 hours for your project

• Model: NN3018MBKRCC1-P4
• Inner Diameter (ID): 90mm
• Outer Diameter (OD): 140mm
• Width: 37mm
• Structure: Double row cylindrical roller bearing, triple rib inner ring, ribless outer ring, MB solid brass cage, 1:12 tapered bore
• Material: GCr15 bearing steel
• Precision Grade: P4
• Internal Clearance: CC1 (extra small clearance for spindle preload)
• Dynamic Load Rating Cr: 172kN
• Static Load Rating C0r: 220kN
• Grease Limit Speed: 6300 r/min
• Oil Mist Limit Speed: 7500 r/min
• Matching Adapter Sleeve: H3018
• Weight: 1.86kg

👉 Full technical data and installation drawings available upon request

• 1:12 taper bore cooperates with H3018 sleeve to achieve accurate preload adjustment, greatly boost spindle rigidity
• Double row roller layout provides ultra-high radial load capacity, resists cutting impact deformation
• Solid brass MB cage is high temperature resistant, low friction and not easy to deform under high speed
• CC1 minimal clearance suppresses vibration, ensures ultra-smooth low-noise precision machining
• P4 ultra-precision grinding with strict tolerance control, stable long-term machining accuracy
• Support customized clearance, OEM laser marking and fumigated wooden export packaging

👉 Helps reduce maintenance cost and improve machine processing performance

• This bearing is widely used in:
• Heavy vertical & horizontal CNC machining center spindles
• Large mold engraving, heavy grinding machine spindle assemblies
• Precision heavy-duty lathe main shafts
• High-load industrial high-speed rotary equipment
• Metallurgical precision rolling auxiliary roller components

👉 Ideal for customers looking for reliable high-rigidity spindle bearing solutions

• 25+ years experience manufacturing P4 super precision spindle cylindrical roller bearings
• Complete NN30 series tapered bore precision bearings in stock for fast delivery
• 100% full inspection of dimension, hardness, noise and temperature rise before shipment
• Professional spindle matching technical support within 24 hours
• Stable mass supply for machine tool factories and spindle manufacturers

👉 We focus on quality, reliability, and long-term cooperation

• Raw material composition & hardness inspection
• Ultra-precision grinding and heat treatment process monitoring
• CC1 clearance calibration test
• High-speed rotation noise & temperature rise endurance test
• Taper bore matching test with H3018 adapter sleeve
• Final anti-rust treatment & export wooden box packaging inspection

👉 Ensuring consistent stable precision performance for every bearing

Get a Quote Now

Looking for P4 precision heavy spindle roller bearing supplier?

👉 Send your inquiry to get:

• Fast quotation within 24 hours
• One-on-one technical matching support
• Custom clearance & OEM marking service
• Competitive factory bulk price

👉 Click “Send Inquiry” or contact us now