HOW TO UNDERSTANDING THE SIGNALS ON SKF BEARINGS

ICV World CO.,Ltd 07/12/2020
how-to-understanding-the-signals-on-skf-bearings

Bearing is an indispensable product for use in today's industries, it is designed for the right application in different machines and equipment. Each different type of bearing has different structural and technical characteristics for application to a specific purpose. It is necessary to apply the symbols for different bearing types by bearing manufacturers to make the selection and grading process easier. Along with ICV World read and understand the symbols applied by the world's largest bearing manufacturer SKF on their bearings.

Symbols and meanings of SKF bearing brands
R1: The outer ring has a block edge. Spherical roller surface.
RS: Neoprene contact seal with or without reinforcement steel plate, fitted on one side of the bearing.
2RS: RS contact seals on both sides of the bearing.
RS1: Acrylonitrile Butadiene (NBR) rubber contact seal with reinforced steel plate, mounted on one side of the bearing.
2RS1: RS1 contact seal on both sides of the bearing.
RS1Z: Acrylonitrile Butadiene (NBR) rubber contact seal with reinforced steel plate, fitted on one side of the Bearing and the other with a steel cover.
RS2: Fluoro rubber contact seal (FPM) with a reinforced steel plate fitted on one side of the bearing.
2RS2: RS2 contact seals on both sides of the bearing.
RSH: Acrylonitrile Butadiene (NBR) rubber contact seal with reinforced steel plate, mounted on one side of the bearing.
2RSH: RSH contact seal fitted on both sides of the bearing.
RSL: Acrylonitrile Butadiene (NBR) low friction low friction seal with reinforced steel plate, mounted on one side of the bearing.
2RSL: RSL low friction seal fitted on either side of the bearing
RZ: Acrylonitrile Butadiene (NBR) low friction low friction seal with reinforced steel plate, fitted on one side of the bearing.
2RZ: RZ low friction seal fitted on either side of the bearing
S0: The bearings of the ball or the seal ring are dimensional stabilized to allow working temperature up to +150 degrees Celsius.
S1: The bearings of the ball bearing or the seal ring are dimensional stabilized to allow working temperatures up to +200 degrees Celsius.
S2: The bearings of bearings or seals are dimensioned to allow working temperatures up to +250 degrees Celsius.
S3: The rings of the ball bearing or the seal ring are dimensional stabilized to allow working temperatures up to +300 degrees Celsius.
S4: The rings of the ball bearing or the seal ring are dimensional stabilized to allow working temperatures up to +350 degrees Celsius.
T: Cut-outs made of Phenolic resin with fiber reinforcement, located in the middle of the roller.
TB: Phenolic plastic ring with fiber reinforcement, closed cell, arranged in the inner ring.
TH: Open-loop phenolic plastic with fiber reinforcement, located in the middle of the roller.
TN: Polyamide injection molding, positioned in the middle of the roller.
TNH: Molded by Polyether etherketone (PEEK), arranged in the middle of the TNHA ring.
TN9: Fiberglass-reinforced Polyamide 6.6 insulated ring positioned in the middle of the roller.
UU: Combined with a digit to denote the clutch, inner ring, and roller set or outer ring with small height tolerances. For example:
U2: Width tolerance + 0.05 / 0 mm.
U4: Width tolerance + 0.10 / 0 mm.
V: The ball bearing has no gap.
V: Combined with a second letter specifying a group of special bearings and the following three or four digits denote Bearing types without standard predicate symbols.

VA: Bearing group for special applications.
VB: Bearing group has a special size tolerance.
VE: A group of bearings with variable external or internal characteristics.
VL: Bearing group with surface coating.
VQ: The group of bearings has non-standard quality and tolerance.
VS: Group of bearings with special clearance and post-tensioning.
VT: The bearing group has special lubrication properties.
VU: Group of bearings for other applications.
VA201: Bearing for high temperature applications such as wheel gears.
VA208: Bearings for high temperature applications.
VA216: Bearings for high temperature applications.
VA228: Bearings for high temperature applications.
VA301: Bearing for the train wheel traction engine.
VA305: Bearing for train wheel traction engine + special inspection procedure.
VA3091: Bearing for train wheel traction motors + The outer surface of the outer ring is coated with Aluminum oxide coating for insulation up to 1,000Volt DC.
VA320: Bearing for train wheels in accordance with EN 12080: 1998.
VA350: Bearings for train wheels.
VA405: Bearings for applications with strong vibrations.
VA406: Bearings for applications with strong vibrations with a special PTFE coating on the hole surface of the inner ring VC025 Ball bearing components are specially treated for use in applications in contaminated environments heavy.
VE240: Reconstructed CARB bearing has a larger axial displacement.
VE447: The shaft seal has three threaded holes evenly spaced on one side for convenient lifting with the crane.
VE552: The outer ring has three threaded holes evenly spaced on one side for convenient lifting with the crane.
VE553: The outer ring has three threaded holes evenly spaced on both sides for convenient lifting with a crane.
VE632: The bearing ring has three threaded holes evenly spaced on one side for convenient lifting with the crane.
VG114: Steel ring with surface quenching.
VH: Roller bearing without gap with self-aligning roller set.
VL0241: The outer surface of the outer ring is coated with Aluminum oxide to insulate up to 1,000Volt DC.
VL2071: The outer surface of the inner ring is coated with Aluminum oxide to insulate up to 1,000Volt DC.
VQ015: The inner ring has a special groove to increase the shaft deviation allowance.
VQ424: Performance better than C08.
VT143: High pressure grease, with Lithium thickener, NLGI 2 thickening at temperatures from –20 to +110 degrees C (standard amount of pre-applied grease).
VT378: Food grease, with aluminum thickener, NLGI 2 thickener at temperatures from –25 to +120 degrees C (standard amount of pre-applied grease).
 

There are also a number of symbols that are commonly used by bearing manufacturers

W

There is no groove and lubrication hole on the outer ring

WT

Low and high temperature resistant greases available in bearings (-40 to +160 degrees C)

The WT or two digits following the WT determines the type of grease

W20

There are three lubricating holes on the outer ring

W26

There are six lubrication holes on the inner ring

W33

There are grooves and three lubrication holes on the outer ring

W33X

There are grooves and six lubrication holes on the outer ring

W513

There are six lubrication holes on the inner ring and the groove with three lubrication holes on the outer ring

W64

Bearings are pre-lubricated with "Solid Lubricant"

W77

W33 lubricating holes are blocked

X1

The bag size is changed to conform to ISO standard

2

Cylindrical roller surface (Bearing on rail)

Y

Brass ring, located right between the rollers, other designs and materials shall be marked with a number following Y as Y1

Z

Punched steel stopper installed on one side of the bearing

2Z

Z block cover installed on both sides of bearing
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