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627 Deep Groove Ball Bearing 7x22x7mm

When a 6mm bore bearing hits its load limit but an 8mm shaft is not an option, the 627 steps in. Its 22mm OD and 3.35 kN dynamic load rating bridge the gap between the 626 and 628 in the miniature deep groove ball bearing family.

Key Specifications

Sealing: Open, metal-shielded (ZZ), or double rubber-sealed (2RS) configurations across all protection levels.
Speed and Load: 34,000 RPM (open/ZZ), 3.35 kN dynamic load, 1.40 kN static load at standard clearance.
Operating Direction: Radial loads with moderate bidirectional axial capacity; not designed for pure thrust.
Temperature Range: -40 to 120 C with NBR seals and lithium grease fill; wider with alternate materials.
Material and Precision: GCr15 bearing steel (AISI 52100), ABEC-3, 100% dimensional inspection with batch reports.

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627 Deep Groove Ball Bearing

Model	627
Type	Open / Shielded / Sealed
Bore Dia. (d)	7 mm
Outside Dia. (D)	22 mm
Width (B)	7 mm
Dynamic Load Cr	3.35 kN
Static Load Cor	1.40 kN
Max Speed	34,000 RPM (open/ZZ) 20,000 RPM (2RS)
Material	GCr15 bearing steel (AISI 52100)
ABEC	ABEC-3
Temperature	-40 to 120 C

Bore x OD x Width

7 x 22 x 7 mm

Dynamic Load Cr

3.35 kN

Static Load Cor

1.40 kN

Max Speed

34,000 RPM

Sealing

Open / ZZ / 2RS

Precision

ABEC-3

Shielding and Lubrication

The 627 bearing is manufactured in three sealing configurations. Open bearings are designed for oil-bath or oil-mist systems where lubrication is supplied externally. ZZ metal shields use non-contact steel covers pressed into the outer ring; these retain factory grease while adding negligible friction, keeping the speed rating close to the open-bearing value.

2RS rubber seals use nitrile (NBR) lips that contact the inner ring shoulder, blocking moisture and fine particulate. Seal drag in 2RS configuration reduces the maximum speed to approximately 20,000 RPM. At the 7mm bore scale, seal friction accounts for a measurable portion of total bearing torque, a variable worth modeling in battery-powered or low-inertia designs.

Performance

The 627 delivers 3.35 kN dynamic load and 1.40 kN static load capacity. Within the 7mm-bore miniature family, the step from the 626 bearing (6x19x6mm, 2.34 kN Cr) to the 627 bearing represents a 43% gain in dynamic capacity for a 1mm bore increase and a 3mm OD increase. The 628 bearing (8x24x8mm) extends load and size further.

For designs locked to a 7mm shaft, the 627 bearing provides the highest load rating in this bore class without moving to a wider series. ABEC-3 precision is standard. Higher ABEC grades are available for spindle and instrumentation applications where runout control, not load, determines the tolerance requirement.

OEM and Customization

Yuanhe supplies the 627 bearing with customization options for volume orders. Bore, OD, and width conform to the 627 dimensional standard, but internal geometry parameters can be tailored. Non-standard radial clearance values (C2, C3, C4) accommodate press-fit assemblies or thermal expansion conditions.

Grease fill type is selectable: standard lithium for general use, low-noise ester-based grease for applications below 40 dB(A), or high-temperature polyurea for continuous operation above 100 C. Cage material options include stamped steel (standard), glass-reinforced polyamide for reduced rotating mass, or machined brass for high-speed stability. Submit your drawing or specification sheet for a quote.

Applications

Small electric motors and cooling fans

RC servos and hobby gearboxes

Dental handpiece turbines

Laboratory centrifuges and stirrers

3D printer extruder drive spindles

Medical infusion pumps

Optical encoder spindles

Handheld power tools

Frequently Asked Questions

How does the 627 bearing compare to the 626 bearing in load capacity? +

The 627 bearing (7x22x7mm, 3.35 kN Cr) handles 43% more dynamic load than the 626 bearing (6x19x6mm, 2.34 kN Cr). The additional 3mm OD provides enough cross-section for larger balls and a thicker outer ring. Specify the 627 bearing when 626 bearings show early fatigue spalling under your load cycle.

What shaft and housing tolerances should I use with a 627 bearing? +

For a 7mm shaft rotating under moderate load, use a j6 or k6 shaft fit and an H7 housing fit. For stationary shaft and rotating housing applications, reverse to g6 or h6 shaft fit and M7 housing. Confirm the fit class against your operating temperature range and expected thermal growth.

Can the 627 bearing run at 34,000 RPM in a sealed 2RS configuration? +

No. The 34,000 RPM rating applies to open or ZZ-shielded configurations. 2RS rubber seals add contact friction that limits the 627 bearing to approximately 20,000 RPM. If your application requires both sealing and speeds above 20,000 RPM, consider ZZ shields paired with an external labyrinth seal on the housing.

What lubrication fill is standard for Yuanhe 627 bearings? +

Standard fill is a lithium-soap grease at 25-35% of bearing free volume, rated for -40 to 120 C. Low-noise PAO grease is available for applications requiring operation below 40 dB(A). High-temperature polyurea grease extends the upper limit to 150 C for intermittent-duty cycles.