Deep Groove Ball Bearing

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. As the leading deep groove ball bearing factory, TPI Bearings owns abundant experience in designing and producing this type of bearing.

Inner and outer rings

Standard bearing steel with a content of carbon and chromium was selected and hardened to withstand the intense pressure between the rolling elements and bearing rings.

Carbonitriding on both inner and outer rings is a basic hardening process for TPI deep groove ball bearing factory. Through this special heat treatment, hardness on the raceway surface is increased; which reduces wear accordingly.

Ultra-clean steel is available in some product series from TPI ball bearings suppliers now, higher wear-resistance is obtained accordingly. Since contact fatigue is often caused by hard non-metallic inclusions, deep groove ball bearings nowadays require exceptional levels of cleanliness.

Rolling element

Steel balls with up to G3 grade ensure TPI deep groove ball bearing factory has 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.

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.

Seal

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

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.

Grease

TPI deep groove ball bearing factory cooperates with the best grease manufacturers in the world which allows us to suggest and apply the best lubricating selection for our customers.

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:

Code		Explanation
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

Code	Type and construction	Explanation
Z ZZ	Shield	Metal shield plate is affixed to outer ring Inner ring incorporates a V-groove and labyrinth clearance Non-contact type Low torque Limiting speed same as open type Fair at dust-resistance, not recommended for water-resistance, relative wide allowable temperature range
LB LLB	Seal	Outer ring incorporates synthetic rubber molded to a steel plate Seal edge is aligned with V-groove along inner ring surface with labyrinth clearance Non-contact type Low torque Limiting speed same as open type Better than ZZ-type in dust proofing, not recommended for water-resistance Allowable temperature range: -25~120˚C
LU LLU	Seal	Metal plate wraps synthetic rubber affixed outer ring has better sealed effect Seal plate has two lips, the inner lip contacts with V-groove of inner ring , the outer lip keeps small clearance with another side of V-groove, in the shape of a labyrinth. Contact type Good dust-resistance and water-resistance, standard contact type of seal plate Fit low torque, dust-resistance motor Allowable temperature of general material ranges from -25~120°C
LU-X LLU-X	Seal	Metal plate wraps synthetic rubber affixed outer ring has better sealed effect Seal plate has two lips and both lips contact with V-groove of inner ring. Contact type Higher torque than LLU Good dust-resistance, water-resistance than standard LLU seal plate Allowable temperature of general material ranges from -25~120°C
LH LLH	Seal	Outer ring incorporates synthetic rubber molded to a steel plate Basic construction the same as LU type, but specially designed lip on edge of seal prevents penetration by foreign matter Contact type Low torque construction; Much better that LLU-type Much better that LLB-type in dust proofing, very good in water proofing Allowable temperature range: -25~120˚C
LE LLE	Seal	Metal plate wraps synthetic rubber affixed outer ring has better sealed effect Seal plate has four lips, two inner lip contacts with V-groove of inner ring , another inner lip form labyrinth with V-groove of inner ring, the outer lip keeps small clearance with another side of V-groove, in the shape of a labyrinth. Contact type Good dust-resistance, low-torque characteristic close to standard type of seal plate Allowable temperature of general material ranges from -25~120˚C
Please consult TPI about applications which exceed the allowable temperature range of products listed on this table.

Code

Type and construction

Explanation

Z
ZZ

Metal shield plate is affixed to outer ring

Inner ring incorporates a V-groove and labyrinth clearance

Non-contact type

Low torque

Limiting speed same as open type

Fair at dust-resistance, not recommended for water-resistance, relative wide allowable temperature range

LB LLB

Outer ring incorporates synthetic rubber molded to a steel plate

Seal edge is aligned with V-groove along inner ring surface with labyrinth clearance

Non-contact type

Low torque

Limiting speed same as open type

Better than ZZ-type in dust proofing, not recommended for water-resistance

Allowable temperature range: -25~120˚C

LU LLU

Metal plate wraps synthetic rubber affixed outer ring has better sealed effect

Seal plate has two lips, the inner lip contacts with V-groove of inner ring , the outer lip keeps small clearance with another side of V-groove, in the shape of a labyrinth.

Contact type

Good dust-resistance and water-resistance, standard contact type of seal plate

Fit low torque, dust-resistance motor

Allowable temperature of general material ranges from -25~120°C

LU-X LLU-X

Metal plate wraps synthetic rubber affixed outer ring has better sealed effect

Seal plate has two lips and both lips contact with V-groove of inner ring.

Contact type

Higher torque than LLU

Good dust-resistance, water-resistance than standard LLU seal plate

Allowable temperature of general material ranges from -25~120°C

LH LLH

Outer ring incorporates synthetic rubber molded to a steel plate

Basic construction the same as LU type, but specially designed lip on edge of seal prevents penetration by foreign matter

Contact type

Low torque construction; Much better that LLU-type

Much better that LLB-type in dust proofing, very good in water proofing

Allowable temperature range: -25~120˚C

LE LLE

Metal plate wraps synthetic rubber affixed outer ring has better sealed effect

Seal plate has four lips, two inner lip contacts with V-groove of inner ring , another inner lip form labyrinth with V-groove of inner ring, the outer lip keeps small clearance with another side of V-groove, in the shape of a labyrinth.

Contact type

Good dust-resistance, low-torque characteristic close to standard type of seal plate

Allowable temperature of general material ranges from -25~120˚C

Please consult TPI about applications which exceed the allowable temperature range of products listed on this table.

Code	Thickener	Base oil	Penetration (25 °C 60W, mm)	Viscosity 40 °C (100 °C ) (mm2/s,cSt)	Dropping point ( °C )	Operating temperature range ( °C )	Characteristics
2AS	Li	Mineral	275	130(12.2)	181	– 25 ~ 120	General used, heavy load
3ES	Li	Ester	265~295	11.5	193	– 50 ~ 120	General used, low temperature, low torque
5K	Li	Ester	240~270	26(5.2)	191	– 50 ~ 150	General used, low noise, low temperature-resistance
5K*	Li	Ester	250	76.9(10.4)	201	– 40 ~ 150	General used, low noise
LT53	Li	Ester	245	31	200	– 50 ~ 150	Low temperature, low torque, low noise.
L051	Ba complex	SHF	265~295	37	240	– 60 ~ 180	Low temperature, low torque, water-proof
L627	Polyurea	Mineral	284	115	288	– 40 ~ 180	High temperature, long life, heavy load
L542	Diurea	PAO-SHC	220	47.6	260	– 40 ~ 200	High temperature, long life, low noise
L448	Urea	PAO+Ester	243	41	252	– 40 ~ 150	General used, low noise, long life
L417	Urea	Ether+SHC	300	72.3(10.1)	240	– 40 ~ 180	High temperature. Brittle flaking (hydrogen charged) prevention.
L635	Spec. Li	Ester	210	15.8(3.4)	205	– 40 ~ 130	Low fumes
L369	Urea	Ester	267	31.5	250	– 40 ~ 160	General used, high temperature, long life, high speed.
LT13	Urea	Mineral	260	(10.5)	253	– 40 ~ 200	General used, high temperature, long life.
＊ Any special application, please contact TPI.