- English
- Chinese
- French
- German
- Portuguese
- Spanish
- Russian
- Japanese
- Korean
- Arabic
- Irish
- Greek
- Turkish
- Italian
- Danish
- Romanian
- Indonesian
- Czech
- Afrikaans
- Swedish
- Polish
- Basque
- Catalan
- Esperanto
- Hindi
- Lao
- Albanian
- Amharic
- Armenian
- Azerbaijani
- Belarusian
- Bengali
- Bosnian
- Bulgarian
- Cebuano
- Chichewa
- Corsican
- Croatian
- Dutch
- Estonian
- Filipino
- Finnish
- Frisian
- Galician
- Georgian
- Gujarati
- Haitian
- Hausa
- Hawaiian
- Hebrew
- Hmong
- Hungarian
- Icelandic
- Igbo
- Javanese
- Kannada
- Kazakh
- Khmer
- Kurdish
- Kyrgyz
- Latin
- Latvian
- Lithuanian
- Luxembou..
- Macedonian
- Malagasy
- Malay
- Malayalam
- Maltese
- Maori
- Marathi
- Mongolian
- Burmese
- Nepali
- Norwegian
- Pashto
- Persian
- Punjabi
- Serbian
- Sesotho
- Sinhala
- Slovak
- Slovenian
- Samoan
- Scots Gaelic
- Shona
- Sindhi
- Sundanese
- Swahili
- Tajik
- Tamil
- Telugu
- Thai
- Ukrainian
- Urdu
- Uzbek
- Vietnamese
- Welsh
- Xhosa
- Yiddish
- Yoruba
- Zulu
- Kinyarwanda
- Tatar
- Oriya
- Turkmen
- Uyghur
Category
K70X78X30
Needle roller bearings utilize cylindrical rollers with a length-to-diameter ratio exceeding 4:1. This “needle-like” geometry enables exceptional radial load capacity within extremely compact cross-sections, providing superior space efficiency compared to ball bearings of equivalent dimensions.
Needle Roller Bearings
| ISO | K70X78X30 | |
| Raceway diameter inner ring | Fw | 70 mm |
| Outside diameter | Ew | 78 mm |
| Width | Bc | 30 mm |
| Basic dynamic load rating | C | 28.8 kN |
| Basic static load rating | C0 | 64.8 kN |
| Limiting speed | 3100 r/min | |
| Mass bearing | 0.148 kg | |
Structural Breakdown
Key components include:
- Outer Ring: Typically with raceway (cageless types omit outer ring)
- Needle Rollers: Precision-ground rollers transmitting load via line contact
- Cage: Brass/steel/polymer material spacing rollers (cageless types exclude cage)
- Inner Ring: Optional component (e.g., NA-type with inner ring, RNA-type without)
Classification System
- By Design: Full complement (high load), caged (high-speed capable)
- By Function: Radial, thrust, combination bearings
- Special Types: Flanged (axial positioning), aligning (misalignment compensation)
Technical Advantages
| Feature | Engineering Benefit |
| Ultra-slim section | Saves 60% radial space |
| High load density | 300% higher capacity vs. balls |
| Shock resistance | Line contact distributes stress |
| Rotation accuracy | ±0.03mm for precision systems |
| Note: Speed limitation varies by cage material |
Industry Applications
- Automotive: Transmissions (e.g., JTEKT NK17/20), connecting rods
- Robotics: Articulated joints (full complement type prevalent)
- Aerospace: APU rotor support bearings
- Medical: CT scanner gantry rotation (MRI-safe versions)
- Construction: Hydraulic pump drives (Timken TOR 47)
Environmental Adaptation
| Condition | Recommended Solution |
| High temperature | Ceramic-coated rollers + special cages |
| Corrosive media | Full stainless steel (SS suffix) |
| Contaminated areas | Double-lip contact seals (2RS) |
| Ultra-high speed | Polymer cages + oil-air lubrication |
Contact Us
Related Products
7418 AC
Angular Contact Ball Bearings (ACBBs) are precision-engineered bearing units uniquely designed to handle combined radial and axial loads, simultaneously. Unlike standard deep groove ball bearings, they incorporate contact angles (typically between 15° to 40°), enabling them to support substantial axial forces in one direction, often alongside moderate radial forces. This…
6420 2RS
A Deep Groove Ball Bearing is one of the most widely used types of rolling bearings. It consists of an inner ring, outer ring, steel balls, and a cage (or sealing components). The deep groove raceways on the inner and outer rings allow it to withstand radial loads and limited…
NU211
Cylindrical roller bearings are rolling bearings specifically engineered to accommodate high radial loads. Their key rolling elements are cylindrical rollers that make linear contact with the raceways. This design makes them exceptionally effective at handling pure radial forces, serving as critical components in a vast array of industrial applications. Compared…
UCC207-21
The UC series bearings refer to standardized, widely-used pillow block ball bearing units with adapter sleeves. At their core is a deep groove ball bearing featuring a spherical outer diameter (SPB) designed to fit into the matching spherical bore of a cast iron housing. Adhering to metric dimensions, this series is…
1209
Self-aligning ball bearings stand out for their unique ability to automatically compensate for angular misalignment between the shaft and the housing. This misalignment can stem from shaft deflection, mounting errors, or foundation settlement. Unlike standard bearings, self-aligning types offer greater operational flexibility, reducing stress concentrations that lead to premature failure in…
UCT317-52
The UC series bearings refer to standardized, widely-used pillow block ball bearing units with adapter sleeves. At their core is a deep groove ball bearing featuring a spherical outer diameter (SPB) designed to fit into the matching spherical bore of a cast iron housing. Adhering to metric dimensions, this series is…
-
-
-
grashbearings@outlook.com
-
+86-13863568175