NSK Cylindrical Roller Bearings, Single-Row NF-Type, NF311W ,D=55
| Bearing Numbers |
Boundary Dimensions (mm) |
Basic Load Ratings (kN) |
Limiting Speeds (min-1) |
Mass (kg) approx. |
||||||||||
| d | D | B | r min. |
r1 min. |
Fw | Ew | Cr | C0r | Thermal Reference |
Mechanical | Grease | Oil | ||
| NF311W | 55 | 120 | 29 | 2 | 2 | 104.5 | 111 | 111 | 6300 | 4000 | 5000 | 1.47 | ||
DESIGN, TYPES, AND FEATURES
Cylindrical roller bearings are classified into the following types depending on whether or not they have ribs on their rings:
Types NU, N, NNU, and NN are suitable as free-end bearings. Types NJ and NF can sustain limited axial loads in one direction. Types NH and NUP can be used as fixed-end bearings.
The NH type consists of NJ-type cylindrical roller bearings and HJ-type L-shaped thrust collars
The inner ring loose rib of the NUP type should be mounted so that the marked side is on the outside.
If a cage is nonstandard for a given bearing number the number of rollers may vary; in such a case, the load rating will differ from that listed in the bearing tables.
Many NN double-row bearings have tapered bores, and they are primarily used in the main spindles of machine tools. Cages are made of either molded polyphenylenesulfide (PPS) or machined brass.
□Formulation of Bearing Designations
Single-Row Cylindrical Roller Bearing
| ①Bearing type | NU : Single-row cylindrical roller bearings (Outer ring with both ribs + Inner ring without rib) Please refer to page C124 for detailed information. |
| ②Dimension Series | 10 : 10 Series, 2: 02 Series, 22 : 22 Series, 3 : 03 Series, 23 : 23 Series, 4 : 04 Series, |
| ③Bore number | Less than 03, Bearing bore 01 : 12mm, 02 : 15mm, 03 : 17mm Over 04, Bearing bore Bore number X 5 (mm) |
| ④Internal design | E : High load capacity |
| ⑤Cage | W : Pressed-steel Cage, M : Machined Brass Cage, No designation : Machined-brass cage (in Series 10) T : Polyamide 66 resin cage, T7 : L-PPS resin cage |
| ⑥Internal clearance | For All Radial Brgs. Omitted : CN clearance, C3 : Clearance greater than CN, C4 : Clearance greater than C3, CG : Special Clearance For Non-Interchangeable Cylindrical Roller Bearings CC : Normal Clearance, CC3 : Clearance greater than CC, CC4 : Clearance greater than CC3, CCG : Special Clearance |
| ⑦Tolerance class | Omitted : ISO Normal，P6 : ISO Class 6， P5 : ISO Class 5，P4 : ISO Class 4 |
| ⑧NSKHPSTM | & : NSKHPSTM Designation Tolerance Class : ISO Normal |
