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Design

Deep groove ball bearings are widely used in many industries for decades. A deep groove is formed on each inner and outer ring of the bearings enabling them to sustain radial and axial loads or even combinations of both.

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Inner and outer rings
  • Standard bearing steel with content of carbon and chromium was selected and hardended to withstand the intense pressure between rolling element and bearing rings.
  • Carbonitriding on both inner and outer rings is a basic hardening process for many TPI bearings. Through this special heat treament, hardness on the raceway surface is increased; which reduce wear accordingly.
  • Ultra-clean steel is available in some of TPI's product series now, higher wear-resistance is obtained accordingly. Since contact fatigue is often caused by hard non-metallic inclusions, bearings nowadays require exceptional levels of cleanliness.
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Rolling element
  • Steel balls with up to G3 grade ensure TPI bearings have the best stability and this also reflects in bearing performance under high speed rotation.
  • Ceramic balls is an additional option, when it comes to severe operating conditions. Extreme high speed rotation, heavy-duty applications and high heat generation while operating are some stiuations that ceramic balls can definitely help.
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Cage

General cage designs for deep groove ball bearings and characteristic separately as below,

  • Pressed steel riveted cage, the most common design for a deep groove ball bearing. Widely used in bearings operating at dmN number under 350,000.
  • Pressed steel ribbon cage, normally used in bearings with smaller sizes, such as 608 or even smaller bearings.
  • Plastic snap cage, with lighter weight and lower heat generation, this nylon cage is perfect for bearings operating at dmN number above 350,000 and beneath 650,000, which is pretty much sufficient for deep groove ball bearings.
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Seal

Two types of seals, contact and non-contact, were well designed by TPI to effectively reduce the external dust entering in the bearing while rotation.

  • Contact seal, prevent dust and liquid contamination from getting into the bearings. However, the torque will be higher and the limiting speeds will be lower under such application.
  • Non-contact seal, provide a general protection for the bearings. It cannot prevent liquid contamination from getting into the bearings. Torque and limiting speeds are same as the open type.
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Grease

TPI cooperates with the best grease manufacturers in the world which allows us to suggest and apply the best lubricating selection for our customer.

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Life

Bearing life is usually expressed as the number of hours an individual bearing will operate before material fatigue develops on either the raceways or the rolling element. The usual life rating for industrial applications is called “L10” life. The L10 life is the number of hours which that 90% of bearings will survive; or, conversely, 10% of bearings will have failed in the L10 number of service hours.

Designation

The designation indicates the form, size, precision, internal structure, etc. of the bearing, and it's shown as below:

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CodeExplanation
Special application
code
F- Stainless steel bearings
TS2- Dimension stabilized bearings for high temperature use (to 160℃)
TS3- Dimension stabilized bearings for high temperature use (to 200℃)
TS4- Dimension stabilized bearings for high temperature use (to 250℃)
CSB- Special heat treated long-life bearings
ESB- Special heat treated and material extra long-life bearings
EC- Expansion compensating bearings
AC- Creep preventing bearings
Cage L1 Machined brass cage
F1 Machined steel cage
G1 Machined brass cage, rivetless
G2 Pin-type steel cage
J Pressed steel cage
T1 Phenolic cage
T2 Plastic cage, nylon or teflon
Seal or shield LLB Synthetic rubber seal (non-contact type)
LLU Synthetic rubber seal (contact type)
LLH Synthetic rubber seal (low torque type)
ZZ Shield
LLE Better water resistance synthetic rubber seal
Ring configuration N Snap ring groove on outer ring (without snap ring)
NR Snap ring on outer ring
D Bearings with oil holes
Internal clearance C2 Radial internal clearance less than Normal
(CN) Normal radial internal clearance, but not shown in nominal numbers
C3 Radial internal clearance greater than Normal
C4 Radial internal clearance greater than C3
CM Radial internal clearance for electric motor bearings
NA Non-interchangeable clearance (shown after clearance code)
Tolerance standard (P0) JIS standard Class 0 (ABEC-1)
P6 JIS standard Class 6 (ABEC-3)
P5 JIS standard Class 5 (ABEC-5)
P4 JIS standard Class 4 (ABEC-7)
P2 JIS standard Class 2 (ABEC-9)
Lubrication 2AS TPI grease code
L627
3ES
5K
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