NN Series
Double-Row Цилиндрические роликоподшипники
25–500mm Bore | С внутренними рёбрами | Разъёмное наружное кольцо | P5/P4/P2 Grade
The NN series is the industry-standard double-row cylindrical roller bearing for machine tool main spindles. Featuring ribs on the внутреннее кольцо and a smooth наружное кольцо, the NN design allows the наружное кольцо to float axially within the корпус — perfectly accommodating thermal expansion of the вал during высокоскоростной operation. Разъёмная наружное кольцо облегчает easy installation and maintenance.
The Industry Standard for Machine Tool Spindle Radial Support
Luoyang Songju NN series double-row cylindrical roller bearings are the most widely specified bearing type for the non-locating (floating) end of machine tool spindle arrangements. The ribs on the внутреннее кольцо guide the two rows of cylindrical rollers, while the smooth наружное кольцо can be removed from the roller-and-inner-ring assembly — making installation, inspection, and replacement straightforward without risk of damaging прецизионно шлифованная rolling surfaces.
The key advantage of the NN series in spindle applications is its ability to accommodate thermal expansion. As the spindle вал heats up during operation (temperature gradients of 20–30°C are common in высокоскоростной spindles), the наружное кольцо slides axially within the корпус bore — preventing the buildup of destructive axial preload that would otherwise cause bearing seizure or catastrophic spindle failure.
Both cylindrical bore (standard) and tapered bore (K suffix, 1:12 taper) variants are available. The tapered bore позволяет precision radial internal clearance adjustment by advancing the внутреннее кольцо onto a tapered вал journal — a critical capability for achieving optimal spindle running accuracy. Standard NN30 dimensional series covers размер отверстияs from 25mm to 500mm. In a complete spindle arrangement, NN bearings handle radial loads at the floating end while angular contact шарикоподшипники manage осевая нагрузкаs and provide axial location at the opposite end.
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NN Series — Double-Row Cylindrical Roller Bearing Model Параметры
Complete NN30 series model list per NTN precision bearing catalog. Все модели доступны с P5, P4, and P2 (ABEC-5/7/9) класс точностиs.
| Bearing Model | d (mm) | D (mm) | B (mm) | Cr (kN) | C0r (kN) |
|---|---|---|---|---|---|
| NN3006 | 30 | 55 | 19 | 29.0 | 34.0 |
| NN3007 | 35 | 62 | 20 | 39.3 | 50.0 |
| NN3008 | 40 | 68 | 21 | 45.0 | 58.5 |
| NN3009 | 45 | 75 | 23 | 54.0 | 72.0 |
| NN3010 | 50 | 80 | 23 | 57.0 | 80.0 |
| NN3011 | 55 | 90 | 26 | 72.0 | 100.0 |
| NN3012 | 60 | 95 | 26 | 75.0 | 110.0 |
| NN3013 | 65 | 100 | 26 | 76.5 | 118.0 |
| NN3014 | 70 | 110 | 30 | 98.0 | 151.0 |
| NN3015 | 75 | 115 | 30 | 100.0 | 156.0 |
| NN3016 | 80 | 125 | 34 | 120.0 | 186.0 |
| NN3018 | 90 | 140 | 37 | 143.0 | 228.0 |
| NN3020 | 100 | 150 | 37 | 157.0 | 265.0 |
| NN3022 | 110 | 170 | 45 | 220.0 | 370.0 |
| NN3024 | 120 | 180 | 46 | 233.0 | 405.0 |
| NN3026 | 130 | 200 | 52 | 284.0 | 495.0 |
| NN3028 | 140 | 210 | 53 | 310.0 | 550.0 |
| NN3030 | 150 | 225 | 56 | 335.0 | 615.0 |
| NN3032 | 160 | 240 | 60 | 375.0 | 695.0 |
| NN3034 | 170 | 260 | 67 | 450.0 | 835.0 |
| NN3036 | 180 | 280 | 74 | 530.0 | 985.0 |
| NN3040 | 200 | 310 | 82 | 630.0 | 1190.0 |
| NN3044 | 220 | 340 | 90 | 750.0 | 1460.0 |
| NN3048 | 240 | 360 | 92 | 800.0 | 1600.0 |
| NN3052 | 260 | 400 | 104 | 990.0 | 1980.0 |
| NN3056 | 280 | 420 | 106 | 1050.0 | 2150.0 |
| NN3060 | 300 | 460 | 118 | 1230.0 | 2520.0 |
Все модели доступны с P5, P4, and P2 (ABEC-5/7/9) класс точностиs. Standard material: GCr15 (100Cr6/52100) подшипниковая сталь. K suffix = tapered bore (1:12 taper). W33 suffix = lubrication groove + 3 holes in наружное кольцо. B suffix = machined brass cage (double-pronged). T2/HS suffix = высокоскоростной resin cage. C1NA/C2NA = lathe spindle internal класс зазораes. SP = special precision. NTN, NSK, SKF, FAG interchangeable. Контакты engineering for non-standard sizes and custom configurations.
Почему выбирают Luoyang Songju NN Series Цилиндрические роликоподшипники
The spindle industry's preferred radial bearing — double-row design with ribbed внутреннее кольцо for maximum radial stiffness and thermal stability
Maximum Radial Жёсткость
Two rows of cylindrical rollers in line contact with raceways deliver the highest radial stiffness of any rolling bearing type in a given поперечное сечение. The NN30 dimensional series is optimized for spindle applications — providing up to 2× the radial грузоподъёмность of equivalent single-row cylindrical roller bearings.
Thermal Expansion Compensation
The smooth наружное кольцо floats axially within the корпус bore, поглощаетing вал thermal expansion without inducing preload variation. This is the defining advantage of NN серии in высокоскоростной spindles — where temperature gradients exceeding 20°C between вал and корпус are routine in production machining environments.
Разъёмное наружное кольцо — Easy Handling
The наружное кольцо can be removed from the roller-and-inner-ring assembly, allowing each component to be installed and removed independently. This упрощает spindle assembly, bearing inspection, and replacement — reducing maintenance downtime and protecting прецизионно шлифованная surfaces from handling damage.
Коническое отверстие Зазор Adjustment
K suffix (1:12 taper) variants enable fine adjustment of radial internal clearance by advancing the внутреннее кольцо onto a tapered вал journal. Achieve the exact running clearance — from slight positive clearance for высокоскоростной applications to лёгкий преднатяг for maximum stiffness — a capability unique to cylindrical roller bearings.
High-Speed Optimized Internals
Optimized logarithmic roller profiles minimize edge stress at high speeds. High-speed resin cage variants (T2/HS suffix) reduce centrifugal forces and enable higher предельная скоростьs. Controlled internal класс зазораes (C1NA, C2NA) are specifically designed for lathe spindle applications.
NTN / NSK / SKF / FAG Interchangeable
Manufactured to ISO dimensional standards. Direct drop-in replacement for NTN NN30, NSK NN30, SKF NN30, and FAG NN30 series double-row cylindrical roller bearings. Одинаковые монтажные размеры, same performance specifications — конкурентные цены with сокращённые сроки поставки.
Отрасли и применения for NN Series Цилиндрические роликоподшипники
NN серии цилиндрические роликоподшипники are trusted across precision industries worldwide for their unmatched radial performance.
CNC Lathe & Turning Center Spindles
NN серии are the de facto standard for the floating end of CNC lathe main spindles. The наружное кольцо floats in the корпус to accommodate thermal growth while the angular contact bearings at the opposite end provide axial location and thrust capacity — together forming the classic spindle bearing arrangement.
Milling & Machining Center Spindles
High-speed milling spindles demand NN bearings with controlled clearance and высокоскоростной resin cages (T2 suffix). Разъёмная наружное кольцо design allows the bearing to be serviced without complete spindle disassembly — reducing machine downtime in production environments.
Шлифовальные шпиндели
Ultra-precision P2 grade NN bearings with tapered bore (K suffix) and C1NA clearance enable the sub-micron radial runout required for surface, cylindrical, and internal grinding operations. Fine clearance adjustment via the tapered bore optimizes grinding accuracy and surface finish.
тяжёлые Industrial Machinery
Large NN bearings (bore 200mm+) support the main валs of electric motors, generators, gearboxes, and industrial pumps. High radial грузоподъёмность and separable design reduce total cost of ownership through extended service intervals and simplified maintenance.
Нужны NN Series Double-Row Цилиндрические роликоподшипники?
Tell us your размер отверстия, класс точности (P5/P4/P2), bore type (cylindrical/tapered K), cage preference, класс зазора, and quantity. Наши инженеры ответят within 24 hours with a competitive quotation and technical documentation.