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624 Deep Groove Ball Bearing 4x13x5mm

When a 4mm shaft must fit within a 13mm OD housing, the 624 bearing sits between the compact 623 bearing (3x10x4mm) and the larger 625 bearing (5x16x5mm). At 4x13x5mm, it trades 3mm OD for a 74 percent load capacity increase over the 623 bearing while keeping the envelope small enough for hobby servos and compact power tools. This page covers the 624 bearing specifications, sealing options, performance trade-offs, and the design decisions that justify choosing it over step-down or step-up alternatives.

Key Specifications

Configurations: Open, ZZ (metal shields), or 2RS (rubber contact seals).
Dynamic Load: 0.94 kN. Static Load: 0.31 kN. Speed: 45,000 RPM (open/ZZ), 36,000 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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624 Deep Groove Ball Bearing 4x13x5mm

Model	624
Bore (d)	4 mm
OD (D)	13 mm
Width (B)	5 mm
Type	Open / Shielded / Sealed
ABEC	ABEC-1 / ABEC-3
Dynamic Load	0.94 kN
Static Load	0.31 kN
Max Speed	45,000 RPM (open/ZZ)

The 624 bearing is a miniature deep groove ball bearing with 4mm bore, 13mm OD, and 5mm width. Available in open, ZZ (metal shields), and 2RS (rubber seals) configurations. At 0.94 kN dynamic load and 45,000 RPM in open/ZZ configuration, it sits between the compact 623 bearing and the larger 625 bearing in the miniature series. The 2RS sealed variant derates to approximately 0.70 kN and 36,000 RPM for contaminated environments.

Bore x OD x Width

4 x 13 x 5 mm

Dynamic Load Cr

0.94 kN

Static Load Cor

0.31 kN

Max Speed

45,000 RPM

Sealing

Open / ZZ / 2RS

Precision

ABEC-1 / ABEC-3

Shielding and Lubrication

Three sealing configurations serve different environments. Open 624 bearings reach 45,000 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, preserving the full speed rating. 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 36,000 RPM.

At 5mm width, the 624 bearing carries a proportionally larger grease reservoir than narrower miniature bearings. The 2RS configuration extends service intervals in dusty or wet environments at a 9,000 RPM speed penalty. For clean assembly environments and high-speed applications, ZZ or open configurations are the correct choice.

Performance

The 624 bearing sits between the 623 bearing (3x10x4mm, 0.54 kN) and the 625 bearing (5x16x5mm, 1.42 kN) in the miniature series. It delivers 0.94 kN dynamic and 0.31 kN static load in open or ZZ configurations, a 74 percent increase over the 623 bearing. At 45,000 RPM, speed is slightly lower than the 623 bearing (50,000 RPM) due to the larger OD increasing centrifugal loads. For 2RS sealed variants, dynamic load derates to approximately 0.70 kN with speed capped at 36,000 RPM.

OEM and Customization

Yuanhe manufactures 624 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. 440C stainless steel rings and balls provide corrosion resistance for food processing and marine environments. Standard OEM lead time is 7 to 15 days. Send bearing dimensions or part number requirements to contact Yuanhe for a quote.

Applications

Hobby servo motors and RC model gearboxes

Small DC motor rotors up to 50W

Compact power tools and rotary tool spindles

3D printer filament drive assemblies

Office equipment paper feed mechanisms

Small cooling fans and blowers

Frequently Asked Questions

What does ZZ mean on a 624 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 624 ZZ bearing reaches the full 45,000 RPM speed rating, making it the right choice for clean, high-speed applications such as small DC motors and hobby servo drives.

When should I choose a 624 bearing over a 625 bearing? +

Specify the 624 bearing when the housing radial space is capped at 13mm OD. The 625 bearing requires 16mm OD and delivers 1.42 kN dynamic load, a 51 percent increase. The 624 bearing fits into compact power tool housings and small DC motor end bells where 16mm is too large. If space permits 16mm, the 625 bearing handles heavier loads.

Is the 624 bearing suitable for RC and drone applications? +

Yes. The 624 bearing is commonly used in RC car steering linkages, drone gimbal motors, and model aircraft control surfaces. The 2RS sealed variant is preferred for outdoor RC applications where dust and moisture are present. For high-RPM drone motors above 30,000 RPM, the ZZ or open configuration avoids the seal friction penalty.

Can I order 624 bearings in stainless steel? +

Yes. Yuanhe offers 624 bearings with AISI 440C stainless steel rings and balls for corrosion resistance. Stainless 624 bearings carry approximately 80 percent of chrome steel load ratings (roughly 0.75 kN dynamic). Suitable for food processing, marine deck hardware, and outdoor RC applications. Standard OEM lead time is 10 to 15 days. Contact Yuanhe with your requirements.