Precision Cylindrical
Roller Bearings
NN / NNU / N Series | 25–500mm Bore | P5/P4/P2 Grade | Double-Row & Single-Row
Precision double-row and single-row cylindrical roller bearings engineered for maximum radial жёсткость in machine tool main spindles, grinding spindles, and высокоскоростной turning centers. NN and NNU double-row designs provide the industry's highest radial stiffness — the standard choice for the non-locating (floating) end of spindle bearing arrangements. Tapered bore (K suffix) variants enable precision radial clearance adjustment via a 1:12 tapered вал journal.
Precision Цилиндрические роликоподшипники for Machine Tool Spindle Radial Support
Luoyang Songju precision cylindrical roller bearings are manufactured in NN (double-row, ribbed внутреннее кольцо), NNU (double-row, ribbed наружное кольцо), and N/NU (single-row) series to ISO dimensional standards. Each bearing is produced from вакуумно-дегазированная GCr15 (100Cr6 / 52100) подшипниковая сталь in our производственный объект с сертификатом ISO 9001:2015 in Luoyang, China — the historic center of precision bearing manufacturing.
The NN and NNU double-row bearings are purpose-engineered for the non-locating (floating) end of machine tool spindle arrangements. Their separable ring design — where the наружное кольцо (NN) or внутреннее кольцо (NNU) can be removed from the roller-and-ring assembly — облегчает straightforward installation and removal without damaging прецизионно шлифованная rolling surfaces. Линейный контакт между цилиндрическими rollers and raceways обеспечивает the highest radial грузоподъёмность and stiffness of any rolling bearing type in a given поперечное сечение.
NN series (ribbed внутреннее кольцо, smooth наружное кольцо) allows the наружное кольцо to float axially within the корпус to accommodate thermal expansion of the вал — essential for высокоскоростной spindles where temperature gradients between вал and корпус can exceed 20–30°C in operation. NNU series (ribbed наружное кольцо, smooth внутреннее кольцо) обеспечивает the inverse arrangement. Tapered bore variants (K suffix, 1:12 taper) enable precision radial internal clearance adjustment by advancing the внутреннее кольцо onto a tapered вал journal — a capability unique to cylindrical roller bearings and critical for achieving optimal spindle running accuracy.
Запросить цену
Three Series Configurations Available
Choose the right cylindrical roller bearing configuration for your spindle's radial support requirements
NN Series
Double-row with ribs on the внутреннее кольцо and a smooth наружное кольцо. The наружное кольцо is separable from the roller-and-inner-ring assembly. Most popular spindle configuration — наружное кольцо floats axially in корпус to accommodate thermal вал expansion.
NNU Series
Double-row with ribs on the наружное кольцо and a smooth внутреннее кольцо. The внутреннее кольцо is separable from the outer-ring-and-roller assembly. Preferred when axial displacement is desired at the вал interface.
N / NU Series
Single-row designs in N (ribbed внутреннее кольцо), NU (ribbed наружное кольцо), and NJ (ribbed inner + single-rib outer) configurations. Compact, economical solution for spindles with moderate radial loads.
Cylindrical Roller Bearing Model Параметры
Standard model list covering NN, NNU, and N series. Все модели доступны с P5, P4, and P2 (ABEC-5/7/9) класс точностиs. Data per NTN precision bearing catalog specifications.
| Bearing Model | Series | d (mm) | D (mm) | B (mm) | Cr (kN) | C0r (kN) |
|---|---|---|---|---|---|---|
| NN Series — Double-Row, Ribbed Inner Ring | ||||||
| NN3006 | NN30 | 30 | 55 | 19 | 29.0 | 34.0 |
| NN3007 | NN30 | 35 | 62 | 20 | 39.3 | 50.0 |
| NN3008 | NN30 | 40 | 68 | 21 | 45.0 | 58.5 |
| NN3009 | NN30 | 45 | 75 | 23 | 54.0 | 72.0 |
| NN3010 | NN30 | 50 | 80 | 23 | 57.0 | 80.0 |
| NN3011 | NN30 | 55 | 90 | 26 | 72.0 | 100.0 |
| NN3012 | NN30 | 60 | 95 | 26 | 75.0 | 110.0 |
| NN3013 | NN30 | 65 | 100 | 26 | 76.5 | 118.0 |
| NN3014 | NN30 | 70 | 110 | 30 | 98.0 | 151.0 |
| NN3015 | NN30 | 75 | 115 | 30 | 100.0 | 156.0 |
| NN3016 | NN30 | 80 | 125 | 34 | 120.0 | 186.0 |
| NN3018 | NN30 | 90 | 140 | 37 | 143.0 | 228.0 |
| NN3020 | NN30 | 100 | 150 | 37 | 157.0 | 265.0 |
| NN3022 | NN30 | 110 | 170 | 45 | 220.0 | 370.0 |
| NN3024 | NN30 | 120 | 180 | 46 | 233.0 | 405.0 |
| NN3026 | NN30 | 130 | 200 | 52 | 284.0 | 495.0 |
| NN3028 | NN30 | 140 | 210 | 53 | 310.0 | 550.0 |
| NN3030 | NN30 | 150 | 225 | 56 | 335.0 | 615.0 |
| NN3032 | NN30 | 160 | 240 | 60 | 375.0 | 695.0 |
| NN3034 | NN30 | 170 | 260 | 67 | 450.0 | 835.0 |
| NN3036 | NN30 | 180 | 280 | 74 | 530.0 | 985.0 |
| NN3040 | NN30 | 200 | 310 | 82 | 630.0 | 1190.0 |
| NN3044 | NN30 | 220 | 340 | 90 | 750.0 | 1460.0 |
| NN3048 | NN30 | 240 | 360 | 92 | 800.0 | 1600.0 |
| NN3052 | NN30 | 260 | 400 | 104 | 990.0 | 1980.0 |
| NN3056 | NN30 | 280 | 420 | 106 | 1050.0 | 2150.0 |
| NN3060 | NN30 | 300 | 460 | 118 | 1230.0 | 2520.0 |
| NNU49 Series — Double-Row, Ribbed Outer Ring | ||||||
| NNU4920 | NNU49 | 100 | 140 | 40 | 145.0 | 285.0 |
| NNU4922 | NNU49 | 110 | 150 | 40 | 157.0 | 320.0 |
| NNU4924 | NNU49 | 120 | 165 | 45 | 196.0 | 405.0 |
| NNU4926 | NNU49 | 130 | 180 | 50 | 239.0 | 500.0 |
| NNU4928 | NNU49 | 140 | 190 | 50 | 252.0 | 540.0 |
| NNU4930 | NNU49 | 150 | 210 | 60 | 310.0 | 660.0 |
| NNU4932 | NNU49 | 160 | 220 | 60 | 330.0 | 720.0 |
| NNU4936 | NNU49 | 180 | 250 | 69 | 440.0 | 980.0 |
| NNU4940 | NNU49 | 200 | 280 | 80 | 550.0 | 1230.0 |
| NNU4944 | NNU49 | 220 | 300 | 80 | 580.0 | 1330.0 |
| NNU4948 | NNU49 | 240 | 320 | 80 | 600.0 | 1430.0 |
| NNU4952 | NNU49 | 260 | 360 | 100 | 880.0 | 2080.0 |
| NNU4956 | NNU49 | 280 | 380 | 100 | 870.0 | 2100.0 |
| NNU4960 | NNU49 | 300 | 420 | 118 | 1160.0 | 2750.0 |
| N/NU Series — Single-Row Цилиндрические роликоподшипники | ||||||
| N1008 | N10 | 40 | 68 | 15 | 30.0 | 32.5 |
| NU1008 | NU10 | 40 | 68 | 15 | 30.0 | 32.5 |
| N1010 | N10 | 50 | 80 | 16 | 37.5 | 44.0 |
| NU1010 | NU10 | 50 | 80 | 16 | 37.5 | 44.0 |
| N1012 | N10 | 60 | 95 | 18 | 52.0 | 62.0 |
| N1014 | N10 | 70 | 110 | 20 | 66.0 | 82.0 |
| N1016 | N10 | 80 | 125 | 22 | 78.0 | 100.0 |
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). HS/T2 suffix = высокоскоростной resin cage. SP = special precision for machine tools. C1NA/C2NA = lathe spindle класс зазораes. NTN, NSK, SKF, and FAG interchangeable. Custom configurations available — contact engineering for complete catalog.
Почему выбирают Luoyang Songju Цилиндрические роликоподшипники
Разработано для maximum radial жёсткость and precision in the world's most demanding spindle applications
Maximum Radial Жёсткость
Линейный контакт между цилиндрическими rollers and прецизионно шлифованная raceways обеспечивает the highest radial stiffness of any rolling bearing type. NN/NNU double-row designs provide up to 2× the radial грузоподъёмность of equivalent single-row bearings — critical for minimizing spindle deflection under тяжёлое резание loads and ensuring consistent machining accuracy.
Separable Ring Design
The наружное кольцо (NN series) or внутреннее кольцо (NNU series) can be removed from the roller-and-ring assembly — simplifying installation, inspection, and replacement without damaging прецизионно шлифованная rolling surfaces. A practical advantage that снижает maintenance downtime and total cost of ownership.
Thermal Expansion Accommodation
NN series (smooth наружное кольцо) позволяет the наружное кольцо to float axially within the корпус — поглощаетing вал thermal expansion without inducing preload variation. Essential for высокоскоростной spindles where temperature gradients can exceed 20–30°C between вал and корпус in continuous operation.
Tapered Bore — Adjustable Зазор
K suffix (1:12 taper) variants enable precision radial internal clearance adjustment by advancing the внутреннее кольцо onto a tapered вал journal. Achieve the exact running clearance or лёгкий преднатяг your spindle design requires — a capability not available with cylindrical bore bearings and critical for ultra-precision spindle performance.
High-Speed Optimized
Optimized roller profiles with precision-обработанные латунные сепараторы (B suffix) or высокоскоростной resin cages (T2/HS suffix) and controlled internal clearances (C1NA/C2NA for lathe spindles) enable reliable operation at the elevated speeds demanded by modern CNC обрабатывающий центрs, grinding spindles, and высокоскоростной turning centers.
NTN / NSK / SKF / FAG Interchangeable
Manufactured to ISO dimensional standards for NN, NNU, and N series. Direct drop-in replacement for NTN, NSK, SKF, and FAG precision cylindrical roller bearings. Одинаковые монтажные размеры, same performance — конкурентные цены with сокращённые сроки поставки from our сертифицировано ISO 9001:2015 Luoyang facility.
Отрасли и применения for Цилиндрические роликоподшипники
Precision cylindrical roller bearings deliver unmatched radial performance across the most demanding industrial applications
Machine Tool Spindles
NN series double-row bearings are the industry standard for the non-locating (floating) end of CNC lathe, milling, and grinding spindles. Paired with angular contact шарикоподшипники at the locating end for complete spindle support with optimal thermal management.
High-Precision Grinding
Ultra-precision P2 grade NN bearings with controlled clearance enable sub-micron runout for surface, cylindrical, and internal grinding operations. Tapered bore variants allow fine clearance adjustment to optimize grinding wheel finish quality.
Rolling Mill Roll Necks
Large NN and NNU bearings (bore 200mm+) support the extreme radial loads and shock conditions of steel and aluminum rolling mill work rolls. W33 lubrication provisions and reinforced brass cages ensure reliability under continuous тяжёлый operation.
Printing & Converting Machinery
NNU series with ribbed наружное кольцо is preferred for printing cylinders, coating rollers, and paper converting machinery. High running accuracy гарантирует consistent registration, uniform coating thickness, and minimal waste in высокоскоростной web processing lines.
Нужны Precision Цилиндрические роликоподшипники?
Tell us your размер отверстия, series (NN/NNU/N), класс точности (P5/P4/P2), bore type (cylindrical/tapered), cage preference, and quantity. Наши инженеры по применениям respond within 24 hours with a competitive quotation and detailed technical documentation.
Получить выгодное предложение
Заполните форму ниже, и наша инженерная команда ответит в течение 24 часов с ценами и технической документацией.