When should I choose alumina bearing balls instead of steel balls?

Alumina bearing balls are preferred when steel balls may corrode, oxidize, conduct electricity, become magnetic or wear quickly in the working media. They are commonly considered for chemical pumps, valves, flowmeters, instruments and selected industrial bearing assemblies.

Can alumina bearing balls replace silicon nitride balls in high-speed bearings?

Not always. Alumina offers good hardness, chemical resistance and electrical insulation, but silicon nitride is usually preferred for very high-speed, high-load or premium hybrid bearing applications. Alumina is often more suitable when corrosion resistance, insulation and cost balance are more important than maximum speed capability.

What grade should I choose for alumina ceramic bearing balls?

The grade depends on rotational accuracy, noise, clearance and mating surface requirements. Precision bearing assemblies may require tighter grades such as G10 or G20, while pump, valve or instrument applications may accept a different grade after reviewing the seat geometry and working condition.

Can alumina bearing balls replace silicon nitride balls in every ceramic bearing?

No. While alumina bearing balls offer good hardness and corrosion resistance, silicon nitride balls are often preferred for very high-speed and high-load bearings. Alumina is more suitable where chemical resistance and cost balance are more important than extreme speed capability.

What size range is common for alumina ceramic bearing balls?

Common alumina bearing balls are available from small sizes around a few tenths of a millimetre up to several tens of millimetres in diameter, with typical bearing applications using sizes from roughly 0.5–30 mm.

What information should I provide for a custom alumina bearing ball quotation?

Please provide the ball diameter, grade or tolerance, quantity, alumina purity, surface finish, application, working media, operating temperature, speed, load condition and mating seat or race material. A drawing, sample or existing part number will help ADCERAX confirm the most suitable production route.

Are alumina bearing balls resistant to all chemicals?

No. Alumina resists many acids, salts, solvents and treated water systems, but it is not recommended for every chemical environment. Hydrofluoric acid, hydrochloric acid and strong alkaline solutions require special review before alumina is selected.

Alumina Ceramic Bearing Balls for Pumps & Valves

Alumina ceramic balls are dense spherical components made from sintered aluminum oxide (Al₂O₃), valued for their high hardness, wear resistance and chemical stability. They are produced by pressing fine alumina powder into spheres—via isostatic pressing, granulation or molding—and sintering them at high temperature to achieve a strong, uniform microstructure.

Key Engineering Advantages of Alumina Ceramic Bearing Balls

Alumina ceramic bearing balls are used when metal balls may suffer from corrosion, electrical pitting, oxidation, magnetic interference or dimensional drift. Compared with steel balls, Al₂O₃ ceramic balls provide high hardness, low density, electrical insulation and strong resistance to many industrial chemicals.

High Hardness for Wear Control

Alumina ceramic bearing balls have high surface hardness, which helps reduce wear in rolling, sealing and metering contact. This is useful in pumps, valves and instruments where the ball must keep a stable shape after repeated contact with seats, races or flow channels.

Chemical Resistance in Corrosive Media

Al₂O₃ ceramic balls resist many acids, salts, solvents and treated water systems. They are often selected when steel balls may rust, stain, seize or contaminate the process media. Before use, the working chemical, temperature and contact time should still be confirmed.

Electrical Insulation for Special Bearing Designs

Alumina is an electrically insulating ceramic material. In selected bearing or motion assemblies, this helps reduce the risk of current-related surface damage and makes alumina balls useful in equipment where electrical isolation is part of the design requirement.

Lower Density than Steel Balls

Alumina ceramic balls are lighter than steel balls. The lower density helps reduce centrifugal load in rotating assemblies and can support smoother movement in low-to-medium speed applications where weight, corrosion resistance and dimensional stability must be balanced.

Dimensional Stability for Repeatable Performance

Alumina ceramic bearing balls maintain stable geometry under many industrial operating conditions. Controlled roundness, diameter tolerance and surface finish help support repeatable sealing, rolling or metering behavior in pumps, valves, flowmeters and precision instruments.

Non-Magnetic Behavior for Instruments

Alumina ceramic balls are non-magnetic, so they are suitable for instruments and equipment where magnetic interference must be avoided. This can be important in measuring devices, flow control systems and selected precision assemblies.

Technical Properties for Alumina Bearing Ball Selection

Property	Unit	96% Al₂O₃	99% Al₂O₃	99.5% Al₂O₃	99.6% Al₂O₃	99.7% Al₂O₃	99.8% Al₂O₃	99.9% Al₂O₃	99.99% Al₂O₃
Alumina content	%	96	99	99.5	99.6	99.7	99.8	99.9	99.99
Density	g/cm³	3.6-3.75	3.83	3.89	3.91	3.92	3.93	3.94	3.98
Color	–	white	Ivory	Ivory	Ivory	Ivory	Ivory	Ivory	Ivory
Water absorption	%	0	0	–	0	0	0	0	0
Young’s modulus (Elastic modulus)	GPa	300	350	375	356	357	358	359	362
Shear modulus	GPa	–	–	152	–	–	–	–	–
Bulk modulus	GPa	–	–	228	–	–	–	–	–
Poisson’s ratio	–	–	–	0.22	–	–	–	–	–
Compressive strength	MPa	1910	2210	2600	2552	2554	2556	2558	2570
Flexural strength	MPa	260	300	379	312	313	314	315	320
Fracture toughness	MPa·m¹ᐟ²	–	–	4	–	–	–	–	–
Hardness	GPa	14.5	17	17	23	24	25	26	30
Thermal conductivity	W/m·K	22	24	35	32–37	33–38	34–39	35–40	36–42
Thermal shock resistance ΔT	°C	–	–	–	222	223	224	225	228
Maximum use temperature (no load)	°C	1450	1680	≤1750	1755	1760	1765	1770	1800
Coefficient of thermal expansion	10⁻⁶/°C	7.6	7.6	8.4	–	–	–	–	–
Volume resistivity	Ω·cm	>1×10¹⁴	>1×10¹⁴	>1×10¹⁴	>1×10¹⁴	>1×10¹⁴	>1×10¹⁴	>1×10¹⁴	>1×10¹⁴
Dielectric constant (relative permittivity)	–	9.2	9.5	9.8	9.83	9.84	9.85	9.86	9.92
Dielectric strength	kV/mm	15	19	16.9	23.2	23.4	23.6	23.8	24
Dissipation factor (loss factor @ 1 kHz)	–	–	–	0.0002	–	–	–	–	–

Alumina Ceramic Ball Bearings Specifications

Alumina Bearing
Item NO.	Model	Product Size （mm）			r (Min)	Install Size (mm)
Item NO.	Model	d（Inner Dia)	D（Outer Dia）	B（Height）	r (Min)	da (Min)	Max	Max	Max
AT-AB-ZC684CE	684CE	4	9	2.5	0.1	4.8	/	8.2	0.1
AT-AB-ZC694CE	694CE	4	11	4	0.15	5.2	/	9.8	0.15
AT-AB-ZC604CE	604CE	4	12	4	0.2	5.6	/	10.4	0.2
AT-AB-ZC624CE	624CE	4	13	5	0.2	5.6	/	11.4	0.2
AT-AB-ZC634CE	634CE	4	16	5	0.3	6	/	14	0.3
AT-AB-ZC685CE	685CE	5	11	3	0.15	6.2	/	9.8	0.15
AT-AB-ZC695CE	695CE	5	13	4	0.2	6.6	/	11.4	0.2
AT-AB-ZC605CE	605CE	5	14	5	0.2	6.6	/	12.4	0.2
AT-AB-ZC625CE	625CE	5	16	5	0.3	7	/	14	0.3
AT-AB-ZC635CE	635CE	5	19	6	0.3	7	/	17	0.3
AT-AB-ZC686CE	686CE	6	13	3.5	0.15	7.2	/	11.8	0.15
AT-AB-ZC696CE	696CE	7	15	5	0.2	7.6	/	13.4	0.2
AT-AB-ZC606CE	606CE	8	17	6	0.3	8	/	15	0.3
AT-AB-ZC626CE	626CE	9	19	6	0.3	8	/	17	0.3
AT-AB-ZC636CE	636CE	10	22	7	0.3	8	/	20	0.3
AT-AB-ZC687CE	687CE	7	14	3.5	0.15	8.2	/	12.8	0.15
AT-AB-ZC697CE	697CE	7	17	5	0.3	9	/	15	0.3
AT-AB-ZC607CE	607CE	7	19	6	0.3	9	/	17	0.3
AT-AB-ZC627CE	627CE	7	22	7	0.3	9	/	20	0.3
AT-AB-ZC637CE	637CE	7	26	9	0.3	9	/	24	0.3
AT-AB-ZC688CE	688CE	8	16	4	0.2	9.6	/	14.4	0.2
AT-AB-ZC698CE	698CE	8	19	6	0.3	10	/	17	0.3
AT-AB-ZC608CE	608CE	8	22	7	0.3	10	/	20	0.3
AT-AB-ZC628CE	628CE	8	24	8	0.3	10	/	22	0.3
AT-AB-ZC638CE	638CE	8	28	9	0.3	10	/	26	0.3
AT-AB-ZC689CE	689CE	9	17	4	0.2	10.6	/	15.4	0.2
AT-AB-ZC699CE	699CE	9	20	6	0.3	11	/	18	0.3
AT-AB-ZC609CE	609CE	9	24	7	0.3	11	/	22	0.3
AT-AB-ZC629CE	629CE	9	26	8	0.3	11	/	24	0.3
AT-AB-ZC639CE	639CE	9	30	10	0.6	13	/	26	0.6
AT-AB-ZC6800CE	6800CE	10	19	5	0.3	12	12	17	0.3
AT-AB-ZC6900CE	6900CE	10	22	6	0.3	12	12.5	20	0.3
AT-AB-ZC6000CE	6000CE	10	26	8	0.3	12	13	24	0.3
AT-AB-ZC6200CE	6200CE	10	30	9	0.6	14	16	26	0.6
AT-AB-ZC6300CE	6300CE	10	35	11	0.6	14	16.5	31	0.6
AT-AB-ZC6801CE	6801CE	12	21	5	0.3	14	14	19	0.3
AT-AB-ZC6901CE	6901CE	12	24	6	0.3	14	14.5	22	0.3
AT-AB-ZC16001CE	16001CE	12	28	7	0.3	14	/	26	0.3
AT-AB-ZC6001CE	6001CE	12	28	8	0.3	14	15.5	26	0.3
AT-AB-ZC6201CE	6201CE	12	32	10	0.6	16	17	28	0.6
AT-AB-ZC6301CE	6301CE	12	37	12	1	17	18	32	1
AT-AB-ZC6802CE	6802CE	15	24	5	0.3	17	17	22	0.3
AT-AB-ZC6902CE	6902CE	15	28	7	0.3	17	17	26	0.3
AT-AB-ZC16002CE	16002CE	15	32	8	0.3	17	/	30	0.3
AT-AB-ZC6002CE	6002CE	15	32	9	0.3	17	19	30	0.3
AT-AB-ZC6202CE	6202CE	15	35	11	0.6	19	20.5	31	0.3
AT-AB-ZC6302CE	6302CE	15	42	13	1	20	22.5	37	1
AT-AB-ZC6803CE	6803CE	17	26	5	0.3	19	19	24	0.3
AT-AB-ZC6903CE	6903CE	17	30	7	0.3	19	19.5	28	0.3
AT-AB-ZC16003CE	16003CE	17	35	8	0.3	19	/	33	0.3
AT-AB-ZC6003CE	6003CE	17	35	10	0.3	19	21.5	33	0.3
AT-AB-ZC6203CE	6203CE	17	40	12	0.6	21	23.5	36	0.6
AT-AB-ZC6303CE	6303CE	17	47	14	1	22	25.5	42	1
AT-AB-ZC6403CE	6403CE	17	62	17	1.1	23.5	/	55.5	1
AT-AB-ZC6804CE	6804CE	20	32	7	0.3	22	22.5	30	0.3
AT-AB-ZC6904CE	6904CE	20	37	9	0.3	22	24	35	0.3
AT-AB-ZC16004CE	16004CE	20	42	8	0.3	22	/	40	0.3
AT-AB-ZC6004CE	6004CE	20	42	12	0.6	24	25.5	38	0.6
AT-AB-ZC6204CE	6204CE	20	47	14	1	25	26.5	42	1
AT-AB-ZC6304CE	6304CE	20	52	15	1.1	26.5	28	45.5	1
AT-AB-ZC6404CE	6404CE	20	72	19	1.1	26.5	/	65.5	1
AT-AB-ZC6805CE	6805CE	25	37	7	0.3	27	27	35	0.3
AT-AB-ZC6905CE	6905CE	25	42	9	0.3	27	28.5	40	0.3
AT-AB-ZC16005CE	16005CE	25	47	8	0.3	27	/	45	0.3
AT-AB-ZC6005CE	6005CE	25	47	12	0.6	29	30	43	0.6
AT-AB-ZC6205CE	6205CE	25	52	15	1	30	32	47	1
AT-AB-ZC6305CE	6305CE	25	62	17	1.1	31.5	36	55.5	1
AT-AB-ZC6405CE	6405CE	25	80	21	1.5	33	/	72	1.5
AT-AB-ZC6806CE	6806CE	30	42	7	0.3	32	32	50	1
AT-AB-ZC6906CE	6906CE	30	47	9	0.3	32	34	57	1
AT-AB-ZC16006CE	16006CE	30	55	9	0.3	32	42.5	65.5	1
AT-AB-ZC6006CE	6006CE	30	55	13	1	35	36.5	53	1
AT-AB-ZC6206CE	6206CE	30	62	16	1	35	38.5	60	1
AT-AB-ZC6306CE	6306CE	30	72	19	1.1	36.5	42.5	68.5	1
AT-AB-ZC6406CE	6406CE	30	90	23	1.5	54	/	82	2
AT-AB-ZC6807CE	6807CE	35	47	7	0.3	37	37	45	0.3
AT-AB-ZC6907CE	6907CE	35	55	10	0.6	39	39	51	0.6
AT-AB-ZC16007CE	16007CE	35	62	9	0.3	37	/	60	0.3
AT-AB-ZC6007CE	6007CE	35	62	14	1	40	41.5	57	1
AT-AB-ZC6207CE	6207CE	35	72	17	1.1	41.5	44.5	65.5	1
AT-AB-ZC6307CE	6307CE	35	80	21	1.5	43	47	72	1.5
AT-AB-ZC6407CE	6407CE	35	100	25	1.5	43	/	92	1.5
AT-AB-ZC6808CE	6808CE	40	52	7	0.3	42	42	50	0.3
AT-AB-ZC6908CE	6908CE	40	62	12	0.6	44	46	58	0.6
AT-AB-ZC16008CE	16008CE	40	68	9	0.3	42	/	66	0.3
AT-AB-ZC6008CE	6008CE	40	68	15	1	45	47.5	63	1
AT-AB-ZC6208CE	6208CE	40	80	18	1.1	46.5	50.5	73.5	1
AT-AB-ZC6308CE	6308CE	40	90	23	1.5	48	53	80	1.5
AT-AB-ZC6408CE	6408CE	40	110	27	2	49	/	101	2
AT-AB-ZC6809CE	6809CE	45	58	7	0.3	47	47.5	56	0.3
AT-AB-ZC6909CE	6909CE	45	68	12	0.6	49	50	64	0.6
AT-AB-ZC16009CE	16009CE	45	75	10	0.6	49	/	71	0.6
AT-AB-ZC6009CE	6009CE	45	75	16	1	50	53.5	70	1
AT-AB-ZC6209CE	6209CE	45	85	19	1.1	51.5	55.5	78.5	1
AT-AB-ZC6309CE	6309CE	45	100	25	1.5	53	61.5	92	1.5
AT-AB-ZC6409CE	6409CE	45	120	29	2	54	/	111	2
AT-AB-ZC6810CE	6810CE	50	65	7	0.3	52	52.5	63	0.3
AT-AB-ZC6910CE	6910CE	50	72	12	0.6	54	55	68	0.6
AT-AB-ZC16010CE	16010CE	50	80	10	0.6	54	/	76	0.6
AT-AB-ZC6010CE	6010CE	50	80	16	1	55	58.5	75	1
AT-AB-ZC6210CE	6210CE	50	90	20	1.1	56.5	60	83.2	1
AT-AB-ZC6310CE	6310CE	50	110	27	2	59	68	101	2
AT-AB-ZC6410CE	6410CE	50	130	31	2.1	61	/	119	2
AT-AB-ZC6811CE	6811CE	55	72	9	0.3	57	59	70	0.3
AT-AB-ZC6911CE	6911CE	55	80	13	1	60	61.5	75	1
AT-AB-ZC16011CE	16011CE	55	90	11	0.6	59	/	86	0.6
AT-AB-ZC6011CE	6011CE	55	90	18	1.1	61.5	64	83.5	1
AT-AB-ZC6211CE	6211CE	55	100	21	1.5	63	66.5	92	1.5
AT-AB-ZC6311CE	6311CE	55	120	29	2	64	72.5	111	2
AT-AB-ZC6411CE	6411CE	55	140	33	2.1	66	/	129	2
AT-AB-ZC6812CE	6812CE	60	78	10	0.3	62	64	76	0.3
AT-AB-ZC6912CE	6912CE	60	85	13	1	65	66	80	1
AT-AB-ZC16012CE	16012CE	60	95	11	0.6	64	/	91	0.6
AT-AB-ZC6012CE	6012CE	60	95	18	1.1	66.5	69	88.5	1
AT-AB-ZC6212CE	6212CE	60	110	22	1.5	68	74.5	102	1.5
AT-AB-ZC6312CE	6312CE	60	130	31	2.1	71	79	119	2
AT-AB-ZC6412CE	6412CE	60	150	35	2.1	71		139	2
AT-AB-ZC6813CE	6813CE	65	85	10	0.6	69	69	81	0.6
AT-AB-ZC6913CE	6913CE	65	90	13	1	70	71.5	85	1
AT-AB-ZC16013CE	16013CE	65	100	11	0.6	69	/	96	0.6
AT-AB-ZC6013CE	6013CE	65	100	18	1.1	71.5	73	93.5	1
AT-AB-ZC6213CE	6213CE	65	120	23	1.5	73	80	112	1.5
AT-AB-ZC6313CE	6313CE	65	140	33	2.1	76	85.5	129	2
AT-AB-ZC6814CE	6814CE	70	90	10	0.6	74	74.5	86	0.6
AT-AB-ZC6914CE	6914CE	70	100	16	1	75	77.5	95	1
AT-AB-ZC16014CE	16014CE	70	110	13	0.6	74	/	106	0.6
AT-AB-ZC6014CE	6014CE	70	110	20	1.1	76.5	80.5	103.5	1
AT-AB-ZC6214CE	6214CE	70	125	24	1.5	78	84	117	1.5
AT-AB-ZC6314CE	6314CE	70	150	35	2.1	81	92	139	2
AT-AB-ZC6815CE	6815CE	75	95	10	0.6	79	79.5	91	0.6
AT-AB-ZC6915CE	6915CE	75	105	16	1	80	82	100	1
AT-AB-ZC16015CE	16015CE	75	115	13	0.6	79	/	111	0.6
AT-AB-ZC6015CE	6015CE	75	115	20	1.1	81.5	85.5	108.5	1
AT-AB-ZC6215CE	6215CE	75	130	25	1.5	83	90	122	1.5
AT-AB-ZC6816CE	6816CE	80	100	10	0.6	84	84.5	96	0.6
AT-AB-ZC6916CE	6916CE	80	110	16	1	85	87.5	105	1
AT-AB-ZC16016CE	16016CE	80	125	14	0.6	84	/	121	0.6
AT-AB-ZC6016CE	6016CE	80	125	22	1.1	86.5	91	118.5	1
AT-AB-ZC6216CE	6216CE	80	140	26	2	89	95.5	131	2
AT-AB-ZC6817CE	6817CE	85	110	13	1	90	90.5	105	1
AT-AB-ZC6917CE	6917CE	85	120	18	1.1	91.5	94.5	113.5	1
AT-AB-ZC16017CE	16017CE	85	130	14	0.6	89	/	126	0.6
AT-AB-ZC6017CE	6017CE	85	130	22	1.1	91.5	96	123.5	1
AT-AB-ZC6217CE	6217CE	85	150	28	2	94	102	141	2
AT-AB-ZC6818CE	6818CE	90	115	13	1	95	95.5	110	1
AT-AB-ZC6918CE	6918CE	90	125	18	1.1	96.5	98.5	118.5	1
AT-AB-ZC16018CE	16018CE	90	140	16	1	95	/	135	1
AT-AB-ZC6018CE	6018CE	90	140	24	1.5	98	103	132	1.5
AT-AB-ZC6819CE	6819CE	95	120	13	1	100	102	115	1
AT-AB-ZC6919CE	6919CE	95	130	18	1.1	101.5	104	123.5	1
AT-AB-ZC16019CE	16019CE	95	145	16	1	100	/	140	1
AT-AB-ZC6019CE	6019CE	95	145	24	1.5	103	109	137	1.5
AT-AB-ZC6820CE	6820CE	100	125	13	1	105	106	120	1
AT-AB-ZC6920CE	6920CE	100	140	20	1.1	106.5	111	133.5	1
AT-AB-ZC16020CE	16020CE	100	150	16	1	105	/	145	1
AT-AB-ZC6020CE	6020CE	100	150	24	1.5	108	113	142	1.5
AT-AB-ZC6821CE	6821CE	105	130	13	1	110	111	125	1
AT-AB-ZC6921CE	6921CE	105	145	20	1.1	111.5	116	138.5	1
AT-AB-ZC6822CE	6822CE	110	140	16	1	115	117	135	1
AT-AB-ZC6922CE	6922CE	110	150	20	1.1	116.5	121	143.5	1
AT-AB-ZC6824CE	6824CE	120	150	16	1	125	127	145	1
AT-AB-ZC6924	6924	120	165	22	1.1	/	/	/	/
AT-AB-ZC16024	16024	120	180	19	1	/	/	/	/
AT-AB-ZC6024	6024	120	180	28	2	/	/	/	/
AT-AB-ZC6224	6224	120	215	40	2.1	/	/	/	/
AT-AB-ZC6324	6324	120	260	55	3	/	/	/	/
AT-AB-ZC6826	6826	130	165	18	1.1	/	/	/	/
AT-AB-ZC6926	6926	130	180	24	1.5	/	/	/	/
AT-AB-ZC16026	16026	130	200	22	1.1	/	/	/	/
AT-AB-ZC6026	6026	130	200	33	2	/	/	/	/
AT-AB-ZC6226	6226	130	230	40	3	/	/	/	/
AT-AB-ZC6326	6326	130	280	58	4	/	/	/	/
AT-AB-ZC6828	6828	140	175	18	1.1	/	/	/	/
AT-AB-ZC6928	6928	140	190	24	1.5	/	/	/	/
AT-AB-ZC16028	16028	140	210	22	1.1	/	/	/	/
AT-AB-ZC6028	6028	140	210	33	2	/	/	/	/
AT-AB-ZC6228	6228	140	250	42	3	/	/	/	/
AT-AB-ZC6328	6328	140	300	62	4	/	/	/	/
AT-AB-ZC6830	6830	150	190	20	1.1	/	/	/	/
AT-AB-ZC6930	6930	150	210	28	2	/	/	/	/
AT-AB-ZC16030	16030	150	225	24	1.1	/	/	/	/
AT-AB-ZC6030	6030	150	225	35	2.1	/	/	/	/
AT-AB-ZC6230	6230	150	270	45	3	/	/	/	/
AT-AB-ZC6330	6330	150	320	65	4	/	/	/	/
AT-AB-ZC60/22	60/22	22	44	12	0.6	/	/	/	/
AT-AB-ZC62/22	62/22	22	50	14	1	/	/	/	/
AT-AB-ZC63/22	63/22	22	56	16	1.1	/	/	/	/
AT-AB-ZC60/28	60/28	28	52	12	0.6	/	/	/	/
AT-AB-ZC62/28	62/28	28	58	16	1	/	/	/	/
AT-AB-ZC63/28	63/28	28	68	18	1.1	/	/	/	/
AT-AB-ZC60/32	60/32	33	58	13	1	/	/	/	/
AT-AB-ZC62/32	62/32	33	65	17	1	/	/	/	/
AT-AB-ZC63/32	63/32	33	75	20	1.1	/	/	/	/
AT-AB-ZC603CE	603CE	3	9	3	/	/	/	/	/
AT-AB-ZC606CE	606CE	6	17	6	/	/	/	/	/
AT-AB-ZCMR117	MR117	7	11	3	/	/	/	/	/
AT-AB-ZCMR128	MR128	8	12	3.5	/	/	/	/	/
AT-AB-ZCMR85	MR85	5	8	2.5	/	/	/	/	/
AT-AB-ZCMR63-1	MR63-1	3	6	2.5	/	/	/	/	/
AT-AB-ZCMR85-1	MR85-1	5	8	2	/	/	/	/	/
AT-AB-ZCMR148	MR148	8	14	4	/	/	/	/	/
AT-AB-ZCMR84	MR84	4	8	2	/	/	/	/	/
AT-AB-ZCMR126	MR126	6	12	4	/	/	/	/	/
AT-AB-ZCMR74-1	MR74-1	4	7	2	/	/	/	/	/
AT-AB-ZCMR84-1	MR84-1	4	8	3	/	/	/	/	/
AT-AB-ZCMR74	MR74	4	7	2.5	/	/	/	/	/
AT-AB-ZCMR148	MR148	8	14	3.5	/	/	/	/	/
AT-AB-ZCMR63	MR63	3	6	2	/	/	/	/	/
AT-AB-ZCMR103	MR103	3	10	4	/	/	/	/	/
AT-AB-ZCMR104	MR104	4	10	4	/	/	/	/	/
AT-AB-ZCMR105	MR105	5	10	3	/	/	/	/	/
AT-AB-ZCMR105-1	MR105-1	5	10	4	/	/	/	/	/
AT-AB-ZCMR106	MR106	6	10	2.5	/	/	/	/	/
AT-AB-ZCMR106-1	MR106-1	6	10	3	/	/	/	/	/
AT-AB-ZCMR115	MR115	5	11	4	/	/	/	/	/
AT-AB-ZCMR52	MR52	2	5	2.5	/	/	/	/	/
AT-AB-ZCMR62	MR62	2	6	2.5	/	/	/	/	/
AT-AB-ZCMR94	MR94	4	9	3	/	/	/	/	/
AT-AB-ZCMR95	MR95	5	9	3	/	/	/	/	/
AT-AB-ZCR188	R188	6.35	12.7	4.763	/	/	/	/	/
AT-AB-ZCR6	R6	9.525	22.225	5.556	/	/	/	/	/

Alumina Bearing
Item NO.	Model	Product Size （mm）
Item NO.	Model	d（Inner Dia)	D（Outer Dia）	B（Height）
AT-AB-ZC135	135	6	19	6
AT-AB-ZC126	126	6	19	6
AT-AB-ZC127	127	7	22	7
AT-AB-ZC108	108	8	22	7
AT-AB-ZC129	129	9	26	8
AT-AB-ZC1200	1200	10	30	9
AT-AB-ZC2200	2200	10	30	14
AT-AB-ZC1300	1300	10	25	11
AT-AB-ZC2300	2300	10	25	17
AT-AB-ZC1201	1201	12	32	10
AT-AB-ZC2201	2201	12	32	14
AT-AB-ZC1301	1301	12	37	12
AT-AB-ZC2301	2301	12	37	17
AT-AB-ZC1202	1202	15	11	11
AT-AB-ZC2202	2202	15	14	14
AT-AB-ZC1302	1302	15	13	13
AT-AB-ZC2302	2302	15	17	17
AT-AB-ZC1203	1203	17	12	12
AT-AB-ZC2203	2203	17	16	16
AT-AB-ZC1303	1303	17	14	14
AT-AB-ZC2303	2303	17	19	19
AT-AB-ZC7908	7908	40	62	12
AT-AB-ZC7008	7008	40	68	15
AT-AB-ZC7208	7208	40	80	18
AT-AB-ZC7308	7308	40	90	23
AT-AB-ZC7909	7909	45	68	12
AT-AB-ZC7009	7009	45	75	16
AT-AB-ZC7209	7209	45	85	19
AT-AB-ZC7309	7309	45	100	25
AT-AB-ZC7910	7910	50	72	123
AT-AB-ZC7010	7010	50	80	16
AT-AB-ZC7210	7210	50	90	20
AT-AB-ZC7310	7310	50	110	27
AT-AB-ZC7911	7911	55	80	13
AT-AB-ZC7011	7011	55	90	18
AT-AB-ZC7211	7211	55	100	21
AT-AB-ZC7311	7311	55	120	29
AT-AB-ZC7912	7912	60	85	13
AT-AB-ZC7012	7012	60	95	18
AT-AB-ZC7212	7212	60	110	22
AT-AB-ZC7312	7312	60	130	31
AT-AB-ZC7913	7913	65	90	13
AT-AB-ZC7013	7013	65	100	18
AT-AB-ZC7213	7213	65	120	23
AT-AB-ZC7313	7313	65	140	33
AT-AB-ZC7914	7914	70	100	16
AT-AB-ZC7014	7014	70	110	20
AT-AB-ZC7214	7214	70	125	24
AT-AB-ZC7314	7314	70	150	35
AT-AB-ZC7915	7915	75	105	16
AT-AB-ZC7015	7015	75	115	20
AT-AB-ZC7215	7215	75	130	25
AT-AB-ZC7916	7916	80	110	16
AT-AB-ZC7016	7016	80	125	22
AT-AB-ZC7216	7216	80	140	26
AT-AB-ZC7017	7017	85	130	22
AT-AB-ZC7217	7217	85	150	28
AT-AB-ZC7918	7918	90	125	18
AT-AB-ZC7018	7018	90	140	24
AT-AB-ZC7919	7919	95	130	18
AT-AB-ZC7019	7019	95	145	24
AT-AB-ZC7920	7920	100	140	20
AT-AB-ZC7020	7020	100	150	24
AT-AB-ZC7921	7921	/	145	20
AT-AB-ZC7922	7922	/	150	20
AT-AB-ZC2312	2312	60	130	46
AT-AB-ZC1213	1213	65	120	23
AT-AB-ZC2213	2213		120	31
AT-AB-ZC1313	1313		14	33
AT-AB-ZC2313	2313		140	48
AT-AB-ZC1214	1214	70	125	24
AT-AB-ZC2214	2214		125	31
AT-AB-ZC1314	1314		150	35
AT-AB-ZC2314	2314		150	51
AT-AB-ZC1215	1215	75	130	25
AT-AB-ZC2215	2215		130	31
AT-AB-ZC1315	1315		160	37
AT-AB-ZC2315	2315		160	55
AT-AB-ZC1216	1216	80	140	26
AT-AB-ZC2216	2216		140	33
AT-AB-ZC1316	1316		170	39
AT-AB-ZC2316	2316		170	58
AT-AB-ZC1217	1217	85	150	28
AT-AB-ZC2217	2217		150	36
AT-AB-ZC1317	1317		180	41
AT-AB-ZC2317	2317		180	60
AT-AB-ZC1218	1218	90	160	30
AT-AB-ZC2218	2218		160	40
AT-AB-ZC1318	1318		190	43
AT-AB-ZC2318	2318		190	64
AT-AB-ZC1219	1219	95	170	32
AT-AB-ZC2219	2219		170	43
AT-AB-ZC1319	1319		200	45
AT-AB-ZC2319	2319		200	67
AT-AB-ZC1220	1220	100	180	34
AT-AB-ZC2220	2220	100	180	46
AT-AB-ZC1221	1221	105	190	36
AT-AB-ZC2221	2221	105	190	50
AT-AB-ZC1222	1222	110	200	38
AT-AB-ZC2222	2222	110	200	53
AT-AB-ZC1204	1204	20	47	14
AT-AB-ZC2204	2204		47	18
AT-AB-ZC1304	1304		52	15
AT-AB-ZC2304	2304		52	21
AT-AB-ZC1205	1205	25	52	15
AT-AB-ZC2205	2205		52	18
AT-AB-ZC1305	1305		62	17
AT-AB-ZC2305	2305		62	24
AT-AB-ZC1206	1206	30	62	16
AT-AB-ZC2206	2206		62	20
AT-AB-ZC1306	1306		72	19
AT-AB-ZC2306	2306		72	27
AT-AB-ZC1207	1207	35	72	17
AT-AB-ZC2207	2207		72	23
AT-AB-ZC1307	1307		80	21
AT-AB-ZC2307	2307		80	31
AT-AB-ZC1208	1208	40	80	18
AT-AB-ZC2208	2208		80	23
AT-AB-ZC1308	1308		90	23
AT-AB-ZC2308	2308		90	33
AT-AB-ZC1209	1209	45	85	19
AT-AB-ZC2209	2209		85	23
AT-AB-ZC1309	1309		100	25
AT-AB-ZC2309	2309		100	36
AT-AB-ZC1210	1210	50	90	20
AT-AB-ZC2210	2210		90	23
AT-AB-ZC1310	1310		110	27
AT-AB-ZC2310	2310		110	40
AT-AB-ZC1211	1211	55	100	21
AT-AB-ZC2211	2211		100	25
AT-AB-ZC1311	1311		120	29
AT-AB-ZC2311	2311		120	43
AT-AB-ZC1212	1212	60	110	22
AT-AB-ZC2212	2212		110	28
AT-AB-ZC1312	1312		130	31

Alumina vs. Silicon Nitride vs. Zirconia Bearing Balls

Material	Better Fit	Selection Note
Alumina	Chemical resistance, electrical insulation, pump/valve balls, cost-sensitive ceramic solutions.	Good balance of hardness, insulation and cost, but not the first choice for very high-speed or heavy impact bearings.
Silicon Nitride	High-speed bearings, high load, thermal shock and premium bearing assemblies.	Usually preferred for demanding hybrid bearings and spindle applications.
Zirconia	Higher toughness, better impact tolerance and some chemical equipment designs.	Often selected when chipping resistance is more important than maximum hardness.
Silicon Carbide	Severe wear, harsh media and special corrosion environments.	More application-specific and should be reviewed against seat materials and process chemistry.

For many pump, valve and instrument applications, alumina provides a practical balance of corrosion resistance, electrical insulation and cost. For very high-speed, high-load or shock-sensitive bearings, silicon nitride or zirconia may be more suitable after engineering review.

Alumina Ceramic Ball Bearings Packaging

Alumina bearing balls are first packed in sealed inner plastic bags or vials to prevent dust contamination, then placed in small cartons with cushioning for transport.

Where Alumina Ceramic Bearing Balls Are Used？

Chemical Pumps and Process Valves

Alumina ceramic bearing balls are used in metering pumps, dosing pumps, check valves and chemical valve assemblies where steel balls may corrode, stain, seize or lose sealing accuracy. Their hardness and chemical resistance help maintain stable contact with seats and reduce wear in many corrosive or lightly abrasive media.

Best fit: chemical dosing, treated water, solvent handling, low-to-medium speed pump movement and valve sealing.
Review before use: media chemistry, impact load, seat material, operating temperature and required sealing accuracy.
Flowmeters and Measuring Instruments

In flowmeters, gauges and measuring instruments, alumina bearing balls help maintain stable motion, low wear and dimensional consistency. This is useful when small changes in ball geometry can affect measurement repeatability or calibration stability.

Best fit: turbine meters, variable-area meters, pressure instruments and low-contamination measurement systems.
Review before use: ball diameter tolerance, surface finish, media cleanliness, flow rate and housing material.
Electrical and Precision Motion Assemblies

Alumina ceramic balls can be used in selected bearing designs where electrical insulation, corrosion resistance or non-magnetic behavior is more important than extreme high-speed performance. They are suitable for certain automation equipment, instruments and motion components that require stable geometry and controlled friction.

Best fit: low-to-medium speed precision assemblies, electrically insulated designs and compact instruments.
Review before use: speed, load, raceway finish, lubrication, cage material and expected shock load.

Al2O3 Ceramic Ball Bearings Usage Instructions

Installation

1. Verify that the mating races or seats are clean, free of burrs and dimensionally compatible with the alumina bearing balls.
2. Avoid impact loading during assembly; use appropriate press tools and fixtures to prevent point loading or chipping of ceramic balls.
3. When assembling hybrid bearings, confirm that inner and outer rings, cages and balls match the specified grade and clearance.
Operation

1. Match alumina ball bearings with lubricants compatible with the process media and temperature; some high-temperature or clean applications may use dry running or solid lubricants.
2. Monitor operating temperature and speed to stay within bearing design limits; while alumina tolerates high temperatures, surrounding materials such as cages and lubricants may limit the system.
3. In corrosive or abrasive environments, define inspection intervals based on initial field experience to optimise replacement schedules.
Storage

1. Store alumina bearing balls in closed containers in a dry environment to prevent dust contamination and accidental mixing of sizes or grades.
2. Keep original labels and batch IDs visible for traceability; avoid open handling in areas with oil vapours or metal shavings.
Cleaning and Maintenance

1. For cleaning, use neutral detergents or appropriate solvents that are compatible with alumina and the bearing design.
2. Avoid strong alkaline cleaners or hydrofluoric/hydrochloric acid exposure, as alumina is not recommended for these media.
3. Use soft brushes or ultrasonic cleaning where necessary; do not use steel tools that may chip the ceramic surface.
Safety and Limitations

1. Confirm that alumina ball bearings are not used in applications where impact shock loads exceed ceramic fracture toughness; consider design changes or alternative materials in heavy impact duty.
2. In electrical insulation applications, verify that the entire path (balls + races + lubricant) supports the desired insulation level, not just the ceramic balls themselves.
Typical User Questions During Use

1. Issue: Unexpected surface chipping after installation
Likely cause: hard impact during assembly, misalignment between races or contaminated seats.
Mitigation: review installation tooling, use controlled pressing and verify seat geometry before replacement.

2. Issue: Early discoloration or surface attack in chemical service
Likely cause: exposure to unapproved media such as HF, HCl or strong alkali solutions beyond alumina’s recommended range.
Mitigation: confirm process chemistry, switch to suitable ceramic or adjust process to avoid these media.

3. Issue: Noise or run-out higher than expected in prototype bearings
Likely cause: mismatch between ball grade and raceway finish, contamination in assembly, or incorrect internal clearance.
Mitigation: tighten cleanliness controls, match grades for balls and races, and adjust clearance or preload according to bearing design.

FAQ: Alumina Ceramic Bearing Balls for Industrial Use

Q: When should I choose alumina bearing balls instead of steel balls?
A: Alumina bearing balls are preferred when steel balls may corrode, oxidize, conduct electricity, become magnetic or wear quickly in the working media. They are commonly considered for chemical pumps, valves, flowmeters, instruments and selected industrial bearing assemblies.
Q: Can alumina bearing balls replace silicon nitride balls in high-speed bearings?
A: Not always. Alumina offers good hardness, chemical resistance and electrical insulation, but silicon nitride is usually preferred for very high-speed, high-load or premium hybrid bearing applications. Alumina is often more suitable when corrosion resistance, insulation and cost balance are more important than maximum speed capability.
Q: What grade should I choose for alumina ceramic bearing balls?
A: The grade depends on rotational accuracy, noise, clearance and mating surface requirements. Precision bearing assemblies may require tighter grades such as G10 or G20, while pump, valve or instrument applications may accept a different grade after reviewing the seat geometry and working condition.
Q: What size range is common for alumina ceramic bearing balls?
A: Commercial alumina bearing balls are available from small sizes around a few tenths of a millimetre up to several tens of millimetres in diameter, with typical bearing applications using sizes from roughly 0.5–30 mm.
Q: What information should I provide for a custom alumina bearing ball quotation?
A: Please provide the ball diameter, grade or tolerance, quantity, alumina purity, surface finish, application, working media, operating temperature, speed, load condition and mating seat or race material. A drawing, sample or existing part number will help ADCERAX confirm the most suitable production route.
Q: Are alumina bearing balls resistant to all chemicals?
A: No. Alumina resists many acids, salts, solvents and treated water systems, but it is not recommended for every chemical environment. Hydrofluoric acid, hydrochloric acid and strong alkaline solutions require special review before alumina is selected.

Engineering Notes Before Ordering

To quote alumina ceramic bearing balls accurately, ADCERAX recommends providing the ball diameter, tolerance grade, quantity, working media, operating temperature, load condition, speed, mating race or seat material, and whether the balls will be used as loose balls, pump check balls, valve balls or rolling elements in a bearing assembly.

Information Needed	Why It Helps
Ball diameter and tolerance	Confirms fit, clearance and sealing behavior.
Grade or roundness requirement	Determines rotational accuracy and surface consistency.
Working media	Checks corrosion compatibility.
Temperature and speed	Confirms whether alumina is suitable or another ceramic is safer.
Seat or race material	Helps prevent mismatch, noise, chipping or early wear.
Quantity and packaging	Supports batch control, cost calculation and shipment planning.

Catalog No.	AT-AB-ZC694CE
Material	≥ 96% Al2O3
Diameter Tolerance	±0.02 mm
Electrical Insulation	>15 kV/mm
Maximum operating temperature	up to ~1600°C continuous, higher short-term

Alumina Ceramic Bearing Balls for Pumps, Valves and Precision Bearings