2023/09/12

Miniature Bearing Size Chart: Small Components, Great Effect

Table of content

1.Basic Specifications

2.Reference for Miniature Bearing Specifications

Micro-Precision Bearings

Highly precise and reliable mechanical components designed for environments with high speed, low noise, and light loads. Widely used in model-making, medical devices, precision instruments, and more. These tiny bearings play a crucial role in driving forward modern industry and technology, becoming an indispensable part of various mechanical systems.

1.Basic Specifications

Miniature bearings are specialized and designed for high precision, high-speed, light-load, and space-restricted applications. Key specifications include:

Inner Diameter (ID): Typically measured in millimeters (mm) and ranging from 1mm to 10mm.

Outer Diameter (OD): Also measured in millimeters (mm), generally slightly larger than the inner diameter.

Width (W): The bearing's width, also measured in millimeters (mm).

Ball Diameter: Diameter of the internal balls, measured in millimeters (mm).

Material: Miniature bearings are usually crafted from materials like GCr15 or stainless steel.

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2.Reference for Miniature Bearing Specifications

Miniature Bearing Size Chart
Bearing No.	Bearing No.(NMB)	Bore(d)(mm)	Outer(D)(mm)	Width(B)(mm)
681	L-310	1	3	1
L-310w51	L-310w51	1	3	1.5
R-412	R-412	1.2	4	1.8
601X	R-615	1.5	6	2.5
681X	L-415	1.5	4	1.2
691X	L-515	1.5	5	2
602	R-720	2	7	2.8
672	-	2	4	1.2
682	L-520	2	5	1.5
692	R-620	2	6	2.3
676	L-1060	6	10	2.5
686	L-1360	6	13	3.5
696	R-1560	6	15	5
607	R-1970	7	19	6
608ZZ	R-2280zz	8	22	7
628	R-2480	8	24	8
638	R-2880	8	28	9
678	L-1280	8	12	2.5
688 2RS	6882RS	8	16	5
688ZZ	L-1680zz	8	16	5
607 2RS	6072RS	7	19	6