How big is the nu311 bearing bore

This bearing belongs to the imported bearing, Chinese name: NTN NU311 bearing; Bearing inner diameter: 55mm; Bearing Model: NU311 bearing; Bearing series: cylindrical roller bearings.

Main applications: NTN NU311 bearings can be used in: pulverizers, laboratory mixing equipment, Roland printing machines, glass washing machines, medical, container machinery, beverage production equipment, hybrid heat exchangers, desulfurization and dust removal equipment, single-stage pumps, engraving machines, laminating machines, flat plates, gravity separation equipment, drying and curing equipment, glue binding machines, desulfurization machines, aluminum-plastic packaging machines, etc.

The inner diameter of the NU311 bearing is 55mm, the last two digits of the bearing model indicate the inner diameter of the bearing, starting from 04, multiply the last two digits by 5 is the inner diameter of the bearing, 00 represents the inner diameter of the bearing is 10mm, 01 represents the inner diameter of the bearing is 12mm, 02 represents the inner diameter of the bearing is 15mm, and 03 represents the inner diameter of the bearing is 18mm.

Bearing male 2 weighs the inner 4 diameter ruler 4 inch r large x small p can be 6 by 8 d several s kinds of situations: 8, the inner 7 diameter code directly indicates the number of 4 male 0 inner 5 diameter millimeters, in the inner 4 diameter and b foot 4 inch V series code A between the use. "Divide 0 on i.

It is suitable for i bearing male 3 weighing the inner 0 diameter between 10 (non-integer) y. For example, deep groove ball bearing, male 0 is called inner 0 diameter d=; 4. The inner 5 diameter code directly indicates the number of millimeters of 1 diameter in 5 metric 0 scale, and is used between the diameter series of deep groove ball bearings and L angular contact ball bearings, and the B of the inner 6 diameter and D ruler 0 inch S series code. "Divided into 4 open n.

It is suitable for D bearing male 6 inner 4 diameter is 11 to 1 (integer) V between. Such as deep groove ball bearing 054, male 3 weighs 6 diameter d=6mm; 3. The inner 5 diameter code directly corresponds to the inner 1 diameter ruler 1 inch m of the male 8: the inner 5 diameter code 00 - means 7 male 1 inner 0 diameter d = 80mm, the inner 4 diameter code 00 - means 4 male 7 inner 8 diameter d = 22mm, the inner 0 diameter code 06 - means 8 male 8 inner 2 diameter d = 24mm, inner 6 diameter code 01 - means 5 male 2 inner 1 diameter d = 42mm; 4. The number of the inner 8 diameter code multiplied by 05 is 2 metric 2 inner 0 diameter ruler 7 inch L, which is applicable to a bearing male 5 inner 5 diameter in 20 to 20 except for V.

For example, spherical 4 roller K bearing 08402, male 5 inner 6 diameter d = 08 * 00 00mm; 2. The inner 1 diameter code directly indicates the number of 0 mm of inner 0 diameter of 8 men, and is used between the U of the 4-inch C series. "Divided into 3 open d. Suitable for M bearings, male 2, weighing 3 diameters, large M in b and equal to N400 to 6 and O.

For example, the spherical 2 roller x bearing, male 2 weighs the inner 5 diameter d = 400mm. Bearings like 3501 and 007 are applicable to C Article 1, and their male 7 and inner 2 diameters are 00*1 00mm

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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.

NU3192 basic group clearance.

The commonly used is the C3 group, the C3 clearance:

The radial clearance table of cylindrical roller bearings is as follows:

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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.

NU216 is a cylindrical roller bearing, the new domestic model is NU216, and the old domestic model is 32216, in this case NU216 and 32216 are the same. The parameters of nu216 are shown in Figure 1.

32216 is a tapered roller bearing, the new domestic model is 32216, and the old domestic model is 7516E, in this case.

nu216 and 32216 are not the same. The parameters of 32216 are shown in Figure 2 above.