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623 Deep Groove Ball Bearing 3x10x4mm

When a 3mm shaft must fit within a 10mm OD housing, the 623 bearing is the answer. At 3x10x4mm, it bridges the gap between the ultra-compact 622 bearing (2x6x2.5mm) and the larger 624 bearing (4x13x5mm). This page covers the 623 bearing specifications, sealing options, speed limits, and the design decisions that justify choosing it over step-up or step-down alternatives in the 3mm-bore class.

Key Specifications

Configurations: Open, ZZ (metal shields), or 2RS (rubber contact seals).
Dynamic Load: 0.54 kN. Static Load: 0.18 kN. Speed: 50,000 RPM (open/ZZ), 40,000 RPM (2RS).
Load Direction: Radial plus limited bidirectional axial, up to 10-20 percent of radial rating.
Temperature: -20 degrees Celsius to 120 degrees Celsius standard; to 150 degrees Celsius with high-temperature grease.
Precision: ABEC-1 standard; ABEC-3 available for tighter runout control.

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623 Deep Groove Ball Bearing 3x10x4mm

Model	623
Bore (d)	3 mm
OD (D)	10 mm
Width (B)	4 mm
Type	Open / Shielded / Sealed
ABEC	ABEC-1 / ABEC-3
Dynamic Load	0.54 kN
Static Load	0.18 kN
Max Speed	50,000 RPM (open/ZZ)

The 623 bearing is a miniature deep groove ball bearing with 3mm bore, 10mm OD, and 4mm width. Available in open, ZZ (metal shields), and 2RS (rubber seals) configurations. At 0.54 kN dynamic load and 50,000 RPM in open/ZZ configuration, it suits micro-mechanical designs where space and weight are the primary constraints. The 2RS sealed variant derates to approximately 0.40 kN and 40,000 RPM for contaminated environments.

Bore x OD x Width

3 x 10 x 4 mm

Dynamic Load Cr

0.54 kN

Static Load Cor

0.18 kN

Max Speed

50,000 RPM

Sealing

Open / ZZ / 2RS

Precision

ABEC-1 / ABEC-3

Shielding and Lubrication

Three sealing configurations serve different environments. Open 623 bearings reach 50,000 RPM with no seal friction, requiring external lubrication and a clean housing. ZZ bearings use non-contact SPCC steel shields that retain factory grease while adding zero drag. At the 3mm bore scale, the grease film thickness relative to the bearing diameter is proportionally larger than in bigger bearings; this provides adequate lubrication while keeping frictional drag low. 2RS bearings use nitrile rubber (NBR) lip seals that press against the inner ring, blocking moisture and fine dust at the cost of friction, lowering the speed ceiling to approximately 40,000 RPM.

At 4mm width, the 623 bearing carries a micro-scale grease reservoir. Even a small loss of lubricant through evaporation or migration significantly impacts service life. For applications above 40,000 RPM, open or ZZ configurations are the correct choice. The 2RS sealed configuration extends service intervals in contaminated environments but imposes a 10,000 RPM speed penalty.

Performance

Within the miniature bearing family, the 623 bearing sits between the ultra-compact 622 bearing (2x6x2.5mm) and the larger 624 bearing (4x13x5mm). The 624 bearing steps up to 0.94 kN dynamic load, a 74 percent increase, at the cost of 3mm additional OD and 1mm width. The 623 bearing holds the middle ground at 0.54 kN dynamic and 0.18 kN static in open or ZZ configurations. At 50,000 RPM, it is well suited to high-speed micro-applications where radial loads are low and space is at a premium.

OEM and Customization

Yuanhe manufactures 623 bearings to customer specifications. Custom internal clearance grades C2, CN, and C3 are available for volume orders. Low-noise grease fills (V2 or V3 vibration class) support quiet-operation requirements in dental handpieces and micro-instruments. 440C stainless steel rings and balls provide corrosion resistance for medical and laboratory environments. Non-standard bore diameters such as 3.175mm (1/8 inch) are available for RC hobby and imperial-shaft applications. Standard OEM lead time is 7 to 15 days. Send bearing dimensions or part number requirements to contact Yuanhe for a quote.

Applications

Micro RC servo motors and model aircraft linkages

Small cooling fans and blowers up to 50mm diameter

Dental handpiece turbine spindles

Precision measuring instruments

Micro-gearboxes and compact actuators

Optical encoder shafts

Frequently Asked Questions

What does ZZ mean on a 623 bearing? +

ZZ indicates double metal shields (SPCC steel) pressed into the outer ring on both sides. These non-contact shields retain factory grease and block larger particles while adding zero friction. The 623 ZZ bearing reaches the full 50,000 RPM speed rating, making it the right choice for clean, high-speed micro-applications where contamination is not a primary concern.

When should I choose a 623 bearing over a 624 bearing? +

Specify the 623 bearing when the housing radial space is capped at 10mm OD. The 624 bearing requires 13mm OD and 5mm width. The 623 bearing saves 3mm in diameter and 1mm in width, fitting into micro servos, compact cooling fans, and miniature instruments. If space permits 13mm OD, the 624 bearing delivers 74 percent more dynamic load capacity (0.94 kN vs 0.54 kN).

Why do smaller bearings like the 623 achieve higher RPM than larger bearings? +

Centrifugal force on the balls scales with the square of the bearing diameter. A 623 bearing with a 10mm OD generates far less centrifugal stress at 50,000 RPM than a 6302 bearing with a 42mm OD at 20,000 RPM. The limiting factor for bearing speed is not absolute RPM but the DmN value: pitch diameter multiplied by speed. Smaller bearings naturally achieve higher RPM before hitting the same DmN limit, which is why micro-bearings dominate dental drills and precision spindles.

Can I order 623 bearings with a 3.175mm bore for RC applications? +

Yes. The 3.175mm (1/8 inch) bore 623 bearing is a common request for RC hobby applications using imperial shaft sizes. Yuanhe manufactures non-standard bore 623 bearings to order with a lead time of 10 to 15 days. Contact Yuanhe with your shaft diameter for a feasibility check and quotation.