What does the bearing NU310EM stand for

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Bearing NU310EM stands for single row radial cylindrical rollers, reinforced bearings, cages with brass solid, inner ring without flanges, and outer ring double flanges, and the parameters are as follows:

Bearing type: cylindrical roller bearing.

New domestic model: NU310EM

Domestic old model: 32310EH

Inner Diameter (mm):

Outer diameter (mm):

Width (mm):

Nu stands for a single row radial cylindrical roller bearing with no flange in the inner ring and double flange in the outer ring.

3 is actually 03, zero is omitted, indicating the size series code, where 0 is the width series code, 3 is the diameter series code.

10 is the inner diameter code, which means that the inner diameter is 50mm.

E is the code of the internal structure, which is the reinforced type.

m indicates that the cage is a brass entity.

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Answer: There is a difference between NU311E and NU311EM bearings EM after the bearing number means reinforced copper retainer. E represents the internal code of the bearing, and the reinforced type is the improvement of the internal structure design to increase the bearing capacity; m denotes the copper alloy cage of the bearing.

The bearing function is to support, that is, the literal interpretation is used to support the shaft, and the characteristics of the bearing steel: first, the contact fatigue strength; the second is wear resistance; the third is hardness; fourth, anti-rust performance; Fifth, processing performance. In the bearing suffix designation, the copper retainer is indicated by M (H in the old model), and EM means reinforced version of the copper retainer.

The life of a rolling bearing is defined in revolutions (or the number of hours of operation at a certain speed): a bearing within this life should have initial fatigue damage (spalling or chipping) on any of its rings or rolling elements. However, whether in laboratory tests or in actual use, it can be clearly seen that the actual life of the same bearing with the same appearance under the same working conditions is very different.

532307 is the old code name for NJ307V.

Both are cylindrical roller bearings, and the 532307 is less than NUP307, as shown in the following figure

Bearing NU318EM Z1 in EM, E reinforced type, M is the meaning of copper cage. Meaning of the remaining alphanumeric:

nu is the structure; 3 is the diameter and width series; 22 is the inner diameter of 22*5=100mm.

Bearing is an important component in contemporary machinery and equipment. Its main function is to support the mechanical rotating body, reduce the friction coefficient during its movement, and ensure its rotation accuracy.

According to the different friction properties of moving elements, bearings can be divided into two categories: rolling bearings and sliding bearings. Among them, rolling bearings have been standardized and serialized, but compared with sliding bearings, its radial size, vibration and noise are larger, and the highest is also higher.

Rolling bearings are generally composed of four parts: outer ring, inner ring, rolling element and cage, strictly speaking, it is composed of six parts: outer ring, inner ring, rolling element, cage, seal and lubricating oil. It mainly has an outer ring, an inner ring, and a rolling element, which can be defined as a rolling bearing. According to the shape of the rolling elements, rolling bearings are divided into two categories: ball bearings and roller bearings.

NU308EM is a class II short cylindrical bearing, as long as it is with E, it belongs to the special bearing for automobiles, that is, the M used on the car represents the copper protection, and it is also a retainer to protect the balls, as long as it is a copper protection, there must be the letter M on the back, and the first floor is also a bearing, but there are two points that you are wrong 1: Why does it have to be NSK? This type of second-class copper retainer is more domestically matched, such as NRB TMB

NSK's copper protection is very little The second point E stands for special bearings for automobiles.

Roller bearing model, roller bearing accuracy grade: Executive standard: JB T10235-20011

P0 level. ABEC-1 grade. abec-3 3.

P5 level. ABEC-5 level.

Roller bearing noise level: Executive standard: JB T5313-20011

z1v1 2. z2v2 3.Z3V3 Liaocheng Wanzhuan Seiko Bearing **** was founded in 1999, is located in Liaocheng Guanxian County, Shandong, convenient transportation, relying on convenient transportation and logistics, with the majority of customers as the core, with strong strength to develop into a production enterprise with a certain scale of strength today.

Model: NU2313EC

Type: Cylindrical roller bearing.

Inner diameter (mm): 65

Outer diameter (mm): 140

Width (mm): 48

Letter meaning: NU: type code, inner ring flange unflanged cylindrical roller bearing.

EC: Bearings with reinforced rollers to increase load capacity.

Bearings are very common in our daily work, but gold dust rarely have such a comprehensive understanding of it, hurry up to learn this "treasure book".

Classification of bearings.

Count the first or first and second digits together from left to right.

6" indicates deep groove ball bearings (Class 0).

4" indicates double row deep groove ball bearings (Class 0).

2" or "1" indicates a spherical ball bearing (four numbers for the basic designation) (Class 1).

21", "22", "23", "24" indicate spherical roller bearings. (Class 3).

n" denotes cylindrical roller bearings (including short cylindrical rollers and part of an elongated needle roller) (Class 2).

nu" inner ring without flanges.

NJ" inner ring single flange.

NF" outer ring single flange.

n" outer ring without flange.

nn" double-row cylindrical rollers with no flange on the outer ring.

NNU" double-row cylindrical rollers with no flange on the inner ring.

The roller length is at least 5 times the diameter size, and it is called a needle roller bearing (category 4).

NA" rotary outer ring needle roller bearings.

NK" rotary needle roller bearings.

k" needle roller and cage assembly, without inner and outer rings.

7" indicates angular contact ball bearings (Class 6).

3" indicates tapered roller bearings (metric) (Class 7).

51", "52", "53" means radial thrust ball bearings (five numbers in the basic model) (8 categories).

81" indicates thrust short cylindrical roller bearings (Class 9).

29" indicates thrust spherical roller bearings (Class 9).

National standard for bearings.

GB-T 305-1998 Dimensions and tolerances of stop grooves and stop rings on rolling bearing outer rings.

GB-T 308-2002 Rolling Bearing Steel Ball.

GB-T 309-2000 Rolling Bearing Needle Roller.

GB-T 4661-2002 Rolling Bearing Cylindrical rollers.

GB-T 4662-2003 Rolling Bearing Static Load Rating.

GB-T 6391-2003 Rolling Bearing Rated dynamic load and rated life.

JB-T 3034-1993 Rolling Bearing Oil Seal Anti-rust Packing.

JB-T 3573-2004 Rolling bearings -- Measurement method for radial clearance.

JB-T 6639-2004 Rolling Bearing Parts Technical Condition for Skeleton Nitrile Butadiene Rubber Sealing Ring.

JB-T 6641-2007 Rolling Bearing Residual Magnetism and Evaluation Method.

JB-T 6642-2004 Rolling bearing parts -- Roundness and waviness error measurement and evaluation method.

JB-T 7048-2002 Rolling Bearing Parts - Engineering Plastic Cagen.

JB-T 7050-2005 Rolling bearings – Cleanliness assessment method.

The structure is completely different. NU318 is a cylindrical roller bearing and 30318 is a single row tapered roller bearing, but both bearings have the same bore size. The structural aspects are shown in the figure below for a comparison.

NU305M: Short cylindrical roller bearing.

n: type structure code. The rolling element that indicates the bearing is cylindrical rollers.

nu: type structure code N and U together indicate: no flange in the inner ring, double flange in the outer ring, short cylindrical roller bearings.

3: Outer diameter code. The outer diameter size of the bearing is 3 series.

05: Inner diameter code. Indicates the inner diameter size of the bearing = 05 5 = 25mmm: cage code. m stands for copper alloy turning cage.

EM: cage code. e-reinforced, roller-guided. m Copper alloy cage. Now most factories have made improvements on the basis of M cages, and the various properties of EM design bearings are much higher than M.

Single-row cylindrical roller bearings.

Nu stands for the type of construction of a single row cylindrical roller bearing.

m Copper cage.

Short cylindrical roller bearings for brass cages.