OEM/ODM MR93 ZZ Miniature Deep Groove Ball Bearing 3mm ID x 9mm OD x 4mm Width Metal Shielded High-Speed Low-Noise

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3/2/2026

About Us

Ningbo Zhouxin International Trade Co., Ltd. was established in 2025, headquartered in Ningbo, an open coastal city in eastern China, focusing on technology development and global sales in the field of bearings and hardware accessories. The company relies on the strong manufacturing foundation of its parent company ------ 12,000 ㎡ modern production plant, 70+ automated production lines, 100+ professional technical team, 10+ years of precision manufacturing experience, and ISO/RoHS/CE certification. Products are widely used in fields such as household appliances, food machinery, fitness equipment, power tools, motor vehicles, medical devices, and robotics.Core Corporate Advantages: ▸ Precision & Stability Genes: 22 full-chain quality inspection processes strictly control tolerances to ±0.01mm. ▸ Customized Services: ODM/OEM flexible production. ▸ Resource Synergy Network: Sharing parent company's large-scale intelligent production lines, ensuring delivery of tens of millions of orders.

MR93 ZZ Miniature Deep Groove Ball Bearing 3mm ID x 9mm OD x 4mm Width Metal Shielded High-Speed Low-Noise

10 - 999 pieces $0.33
1000 - 4999 pieces $0.28
>=5000 pieces $0.22

The MR93 ZZ bearing is designed for miniaturized applications requiring high precision, compact structure, and reliable performance. It is widely used in precision instruments and meters, micro DC motors, stepper motors, UAV gimbals and servos, high-speed spindles (e.g., dental handpieces), office automation equipment (e.g., printers, scanners), precision models (aero/car models), medical devices (e.g., infusion pumps, diagnostic instruments), and rotating components in various consumer electronics.

Model: MR93 ZZ

Size: 3*9*4

Material: GCr15SiMn

Precision Rating: P6

Lubrication: Contact Customer Service

Customization Available: True

Lead Time: standard models shipped within 10 business days.

Payment Terms: 100% T/T, or 30% T/T in advance, 70% before delivery

Product structure:

This bearing is a standard miniature deep groove ball bearing with metric dimensions. Key structural parameters are: Bore 3mm, Outside Diameter 9mm, Width 4mm. Its construction includes precision-ground raceways and balls made of high-carbon chromium steel (GCr15), with metal shields on both sides (ZZ denotes double metal shields). The cage is typically made of steel or engineered plastic. It is an open-type, pre-lubricated bearing where the shields effectively block the ingress of most dust and particles.

Key performance features:

The MR93 ZZ bearing is renowned for its exceptional miniature performance. Key features include: low starting torque and running frictional moment ensuring high efficiency; dual metal shields providing good contamination exclusion while maintaining low friction; suitability for high-speed operation (up to tens of thousands of RPM with grease lubrication); smooth operation with very low noise and vibration levels; excellent rotational accuracy and durability due to high-quality steel and precision manufacturing; pre-lubricated with high-performance grease, often sufficient for the bearing's entire service life under normal conditions.

Main application scenarios:

In practical applications, the MR93 ZZ bearing is commonly found in: serving as the core support component in micro motors (e.g., drone motors, miniature fan motors), supporting radial loads and enabling high-speed rotation; embedded in precision reduction gearboxes to reduce friction and ensure smooth transmission; used in the rotating spindle systems of precision measuring instruments to guarantee accuracy and repeatability; installed in the drive ends of small pumps and valves for reliable sealing and long service life; acting as wheel hub or transmission bearings in high-end RC cars and model aircraft to enhance motion performance and responsiveness.

Technical Specifications & Requirements:

The manufacturing and selection of the MR93 ZZ bearing must adhere to relevant technical specifications. Typical requirements include: dimensional accuracy conforming to ISO or ABEC standards (e.g., ABEC1 or higher); radial clearance typically in the standard C0 group (small clearance) to meet precision fit requirements; materials must be vacuum-degassed, high-purity bearing steel to ensure hardness and uniform microstructure; post-heat treatment hardness reaching HRC 58-62 to guarantee load capacity and wear resistance; grease must possess wide-temperature performance (e.g., -30°C to +120°C), oxidation resistance, and long-life characteristics; finished products must undergo rigorous noise, vibration, and rotational accuracy testing. Installation requires a clean environment, avoidance of improper hammering, and ensuring appropriate fit tolerances with the shaft and housing (typically shaft j5/k5, housing H6/H7).

Metric Miniature Series Bearings inner diameter 1-9mm / 公制微型系列轴承内径1-9mm

内径	外径	高度		倒角(r)		基本	基本	极限转速		型号
内径	外径	高度		倒角(r)		动负荷	静负荷	Limiting Speed		(Reference)
(D)	(D)	开放型	防尘盖型	开放型	防尘盖型	Cr(N)Basic	Cor(N)Basic	润滑脂	润滑剂	开放型	防尘盖型
(D)	(D)	(B) (Open)	(B1) (Shield)	(Open )	(Shield)	Dynamic	Static	(Grase)	(Oil)	(Open)	(Shield)
1	3	1	一	0.05	-	80	23	130	150	681	-
	3	1.5	一	0.05	-
	4	1.6	一	0.1	-	140	36	100	120	691	-
1.5	4	1.2	2	0.05	0.05	112	33	100	120	681X	681Xzz
	5	2	2.6	0.15	0.15	237	69	85	100	691X	691Xzz
	6	2.5	3	0.15	0.15	330	98	75	90	601X	601Xzz
2	5	1.5	2.3	0.08	0.08	169	50	85	100	682	682zz
	5	2	2.5	0.1	0.1	169	50	85	100	MR52	MR52zz
	6	2.3	3	0.15	0.15	330	98	75	90	692	692zz
	6	2.5	2.5	0.15	0.15	330	98	75	90	MR62	MR62zz
	7	2.5	3	0.15	0.15	385	127	63	75	MR72	MR72zz
	7	2.8	3.5	0.15	0.15	385	127	63	75	602	602zz
2.5	6	1.8	2.6	0.08	0.08	208	74	71	80	682X	682Xzz
	7	2.5	3.5	0.15	0.15	385	127	63	75	692X	692Xzz
	8	2.5	-	0.2	-	560	179	60	67	MR82X	-
	8	2.8	4	0.15	0.15	550	175	60	71	602X	602Xzz
	6	2	2.5	0.1	0.1	208	74	71	80	MR63	MR63zz
3	7	2	3	0.1	0.1	310	111	63	75	683	683zz
	8	2.5	-	0.15	-	560	179	60	67	MR83	MR83zz
	8	3	4	0.15	0.15	560	179	60	67	693	693zz
	9	2.5	4	0.2	0.15	570	187	56	67	MR93	MR93zz
	9	3	-	0.15	-	570	187	56	67	603	603zz
	10	4	4	0.15	0.15	630	218	50	60	623	623zz
	13	5	5	0.2	0.2	1300	485	40	48	633	633zz
4	7	2	2.5	0.1	0.1	310	115	60	67	MR74	MR74zz
	8	2	3	0.15	0.1	395	139	56	67	MR84	MR84zz
	9	2.5	4	0.1	0.1	640	225	53	63	684	684zz
	10	3	4	0.2	0.15	585	204	48	56	MR104	MR104zz
	11	4	4	0.15	0.15	960	345	48	56	694	694zz
	12	4	4	0.2	0.2	960	345	48	56	604	604zz
	13	5	5	0.2	0.2	1300	485	40	48	624	624zz
	16	5	5	0.3	0.3	1730	670	36	43	634	634zz
5	8	2	2.5	0.1	0.1	310	120	56	63	MR85	MR85zz
	9	2.5	3	0.15	0.15	430	168	50	60	MR95	MR95zz
	10	3	4	0.15	0.15	430	168	50	60	MR105	MR105zz
	11	-	4	0.15	0.15	716	282	45	53	MR115	MR115zz
	11	3	5	0.15	0.15	715	281	45	53	685	685zz
	13	4	4	0.2	0.2	1080	430	43	50	695	695zz
	14	5	5	0.2	0.2	1330	505	40	50	605	605zz
	16	5	5	0.3	0.3	1730	670	36	43	625	625zz
	19	6	6	0.3	0.3	2340	885	32	40	635	635zz
6	10	2.5	3	0.15	0.1	495	218	45	53	MR106	MR106zz
	12	3	4	0.2	0.15	715	292	43	50	MR126	MR126zz
	13	3.5	5	0.15	0.15	1080	440	40	50	686	686zz
	15	5	5	0.2	0.2	1730	670	40	45	696	696zz
	17	6	6	0.3	0.3	2260	835	38	45	606	606zz
	19	6	6	0.3	0.3	2340	885	32	40	626	626zz
	22	7	7	0.3	0.3	3300	1370	30	36	636	636zz
7	11	2.5	3	0.15	0.1	455	201	43	50	MR117	MR117zz
	13	3	4	0.2	0.15	540	276	40	48	MR137	MR137zz
	14	3.5	5	0.15	0.15	1170	510	40	50	687	687zz
	17	5	5	0.3	0.3	1610	710	36	43	697	697zz
	19	6	6	0.3	0.3	2340	885	36	43	607	607zz
	22	7	7	0.3	0.3	3300	1370	30	36	627	627zz
	26	9	9	0.3	0.3	4050	1620	28	34	637	637zz
8	12	2.5	3.5	0.15	0.1	545	275	40	48	MR128	MR128zz
	14	3.5	4	0.2	0.15	820	385	38	45	MR148	MR
	16	4	5	0.2	0.2	1260	590	36	43	688	688zz
	19	6	6	0.3	0.3	2240	910	36	43	698	698zz
	22	7	7	0.3	0.3	3300	1370	34	40	608	608zz
	24	8	8	0.3	0.3	3350	1430	28	34	628	628zz
	28	9	9	0.3	0.3	4550	1970	28	34	638	638zz
9	14	3	4.5	0.3	0.3	919	468	36	42	679	679zz
	17	4	5	0.2	0.2	1330	665	36	43	689	689zz
	20	6	6	0.3	0.3	1720	840	34	40	699	699zz
	24	7	7	0.3	0.3	3350	1430	32	38	609	609zz
	26	8	8	0.3	0.3	4550	1970	28	34	629	629zz
	30	10	10	0.6	0.6	5100	2390	24	30	639	639zz

Obtain Certificate / 证书:

About US / 关于我们

> Precision & Stability Genes: 22 full-chain quality inspection processes strictly control tolerances to ±0.01mm.

> Customized Services: ODM/OEM flexible production.

> Resource Synergy Network: Sharing parent company's large-scale intelligent production lines, ensuring delivery of tens of millions of orders.

宁波轴心国际贸易有限公司成立于2025年，总部位于中国东部沿海开放城市宁波，专注轴承及五金配件领域的技术开发与全球销售。依托母公司雄厚的制造基础——12000㎡现代化生产厂房、70+自动化产线、100+专业技术团队，10+年精密制造经验，并通过ISO/RoHS/CE认证，产品广泛应用于家电、食品机械、健身器材、电动工具、机动车辆、医用器械企业核心优势：

> 精密稳定基因：22道全链质检工序严控公差±0.01mm

> 定制化服务：ODM/OEM柔性

> 资源协同网络：共享母公司规模化智能产线，保障千万级

Contact 立即联系

Model（型号 / Modelo）:	MR93
Shield（防尘盖 / Tampa de Proteção / Tampa Antipó）:	ZZ
Precision Rating（精度等级 / Classe de Precisão / Grau de Precisão）:	P6
Z standard（国标振动噪音 / Ruído e Vibração - Padrão Nacional (GB) ）:	Z3
V standard（行标振动噪音 / Ruído e Vibração - Padrão Setorial (JB) ）:	V1
Clearance（游隙 / Folga Interna / Jogo Radial）:	C0
d（内径 / Diâmetro Interno）:	3
D（外径 / Diâmetro Externo）:	9
B（高 / Altura / Espessura）:	4
Material（材料 / Material）:	GCr15SiMn高碳铬钢
Lubrication（润滑方式定制 / Personalização do Método de Lubrificação）:	联系客服Contact Customer Service
r（倒角 / Chanfro / Arredondamento ）:	0.15
Cr (N) Basic Dynamic（基本动负荷 / Capacidade de Carga Dinâmica Básica）:	570
Cor (N) Basic Dynamic（基本静负荷 / Capacidade de Carga Estática Básica）:	187
Limiting Speed Grase（极限转速润滑脂 / Velocidade Limite (Graxa)）*1000rpm:	56
Limiting Speed Oil（极限转速润滑剂 / Velocidade Limite (Lubrificante) ）*1000rpm:	67
Patents:	True
Standard Type:	Standard parts