Sinofou SRB have 2, normal (N), 3, 4 and 5 groups of internal clearance, which are all in line with GB/T 4604.1. Tapered hole spherical roller bearings use 3 groups of clearances as the standard clearance. Bearings larger or smaller than the standard value of clearance can also be produced according to user requirements.

Vibrating machinery bearings need to use a larger radial clearance, 3, 4 groups or non-standard clearance between 3~4.

SRB for vibrating screens have 4 groups of clearances.

When Fa/Fr≤e,

P＝Fr+Y1 Fa

When Fa/Fr＞e,

Pr＝0.67Fr+Y2 Fa

The values of e, Y1 and Y2 can be found in the bearing dimension table.

P0=Fr+Y0Fa

The values of e, Y0 can be found in the bearing dimension table.

ACA  SRB, with movable guide ring and asymmetric rollers.

C  SRB, inner ring without ribs, with movable guide ring, symmetric rollers and pressed cage.

CA  SRB, inner ring without centre rib, with small ribs on both sides, symmetric rollers and solid brass cage.

CAB-CA SRB, perforated in the middle of the roller, with pillar cages.

CABC-CAB SRB, the roller guiding method has been improved (roller surface roughness, raceway surface roughness, heat treatment method change, etc.) to reduce friction.

CAC-CA SRB, the roller guiding method has been improved (roller surface roughness, raceway surface roughness, heat treatment method change, etc.) to reduce friction.

CB  Continuous casting bearing.

CC  CC SRB, the roller guiding method has been improved (roller surface roughness, raceway surface roughness, heat treatment method change, etc.) to reduce friction.

/C3  The clearance conforms to the 3 groups stipulated by the standard.

/C4   The clearance conforms to the 4 groups stipulated by the standard.

/C9  Bearing clearance is different from current standards.

/CRA9  Bearing radial clearance is non-standard, and axial clearance is required.

D  Split bearing.

F1  Carbon steel.

F3  Ductile cast iron.

/P5  Tolerance level conforms to the standard Level 5.

/P6  Tolerance level conforms to the standard Level 6.

/HA  The rings, rolling elements and cages or only the rings and rolling elements are made of vacuum smelted bearing steel.

20Cr2Mn2MoA；/HC2-15Mn；/HC3-G20CrMo）

/HC  The rings and rolling elements or only the rings or only rolling elements are made of carburizing steel (/HC-20Cr2Ni4A；/HC1  20Cr2Mn2MoA；/HC2-15Mn；/HC3-G20CrMo).

/HCR  Represented as a difference in the same specification, only the rolling element is made of carburizing steel.

/HG2-GCr18Mo；/HG3-42CrMo；/HG4-GCr15SiMn）

/HG  The rings and rolling elements or only the rings are made of other bearing steels (/HG-5GrMnMo; /HG1-55SiMoVA; /HG2-GCr18Mo; /HG3-42CrMo; /HG4-GCr15SiMn).

K  Tapered bore bearing, with taper of 1:12.

K30  Tapered bore bearing, with taper of 1:30.

L  Light alloy solid cage. When the cage material changes, use additional numbers to indicate.

N  There is a snap groove on the outer ring of the bearing.

NR  There is a snap groove on the outer ring of the bearing, with a snap ring.

Q1  Aluminum iron manganese bronze.

-2RS  Bearings with RS seal on both sides.

-2RS2  Bearings with steel frame fluorinated rubber seals on both sides.

S  When the inner diameter is less than 65mm, the structure is similar to the CC type, and the cage outline is composed of two broken lines.

/S0  The bearing rings are tempered at high temperature and the working temperature can reach 150℃.

/S1  The bearing rings are tempered at high temperature and the working temperature can reach 200℃.

/S2  The bearing rings are tempered at high temperature and the working temperature can reach 250℃.

/S3  The bearing rings are tempered at high temperature and the working temperature can reach 300℃.

/S4  The bearing rings are tempered at high temperature and the working temperature can reach 350℃.

SDB  Structure code, single-row SRB, with self-aligning and certain axial displacement ability.

TN1  Nylon.

V  Full complement of rolling elements (without cage).

VB  Vibrating screen bearing

/W 20  There are three lubricating holes (no oil grooves) on the outer ring of the bearing.

/W 33  There are oil grooves and three lubricating holes on the outer ring of the bearing.

/W 33T  There are eight lubricating holes on the outer ring of the bearing.

/W 33X  There are oil grooves and six lubricating holes on the outer ring of the bearing.

X1  The outer diameter is non-standard.

X2  The width (height) is non-standard.

X3  The outer diameter and width (height) are non-standard (standard inner diameter).

YAB  The structure and technical requirements are changed at the same time.

YAD  For the same type of bearing, the structure has more than two changes at the same time.

YA1  The outer surface of the bearing outer ring is different from the standard design.

YA2  The inner bore of the bearing inner ring is different from the standard design.

YA3  The end face of the bearing ring is different from the standard design.

YA6  The assembly chamferof the bearing is different from the standard design.

YA7  The rib or guide ring of the bearing is different from the standard design.

YA8  The cage structure is changed.

YB2  Bearing size and tolerance requirements change.

/Z  Bearing vibration acceleration level extreme value group (Z1- has the specified extreme value of vibration acceleration level; Z2- extreme value of vibration acceleration level is less than Z1 group; Z3- extreme value of vibration acceleration level is less than Z2).

/V  Bearing vibration acceleration level extreme value group (V1- has the specified extreme value of vibration acceleration level; V2- extreme value of vibration acceleration level is less than Z1 group; V3- extreme value of vibration acceleration level is less than V2).