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Home Product W 638/4-2Z 2Z Sealed Ball Bearing High-Speed Precision for Electric Motors
W 638/4-2Z(OD4,ID9)

W 638/4-2Z 2Z Sealed Ball Bearing High-Speed Precision for Electric Motors

W638/4-2Z bearing
W638/4-2Z ball bearing
2Z sealed bearing W638
W 638/4-2Z
W638/4-2Z ball bearing with 2Z sealed design provides dual-side rubber seals for dust resistance, compact dimensions, and smooth operation. Ideal for precision applications requiring W638/4-2Z bearing or 2Z sealed bearing W638.
Categories:Power Transmission
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Product Description

The W638/4-2Z bearing is a compact, high-precision W638/4-2Z ball bearing designed for applications requiring reliable rotational performance in constrained spaces. This 2Z sealed bearing features dual metal shields (2Z) for enhanced dust and contaminant resistance. With a compact design, it supports an inner diameter of 4 mm, outer diameter of 9 mm, and thickness of 2.5 mm. Constructed from hardened chrome steel, it operates smoothly at speeds up to 38,000 rpm (grease-lubricated) within a temperature range of -30°C to +110°C. Ideal for small motors, precision instruments, medical devices, and low-torque industrial equipment, the W638/4-2Z offers low noise, minimal maintenance, and extended service life. However, its limited radial load capacity (0.095 kN static, 0.045 kN dynamic) restricts use in heavy-load scenarios. The sealed design prevents lubricant leakage while protecting against particulate ingress, making it suitable for cleanroom or high-purity environments.
Parameter Specification
Model W638/4-2Z Bearing
Type Single row deep groove ball bearing, 2Z sealed
Bore Diameter 4 mm
Outer Diameter 9 mm
Width 4 mm
Dynamic Load Capacity 1.3 kN
Static Load Capacity 0.5 kN
Sealing Type 2Z (Dual metal shields)
Material Chrome steel rings, steel balls
Lubrication Pre-lubricated with grease
Operating Temperature -30°C to +120°C
Weight 1.4 g
question:Does the company have a professional product selection engineering team?
answer:Yes, we have a dedicated team of engineers specializing in market research and product optimization.
question:Why can other suppliers source discontinued models you can't provide?
answer:They may access remaining stock or refurbished units, which we avoid to ensure quality compliance.
question:Can I self-schedule official courier pickup for orders?
answer:No, all shipments are coordinated through our logistics partners to guarantee tracking and security.
question:Can the company ensure stable product supply?
answer:Yes, we maintain long-term partnerships and strict inventory management.
question:Why is there a transaction fee?
answer:The fee covers payment processing and administrative costs for secure transactions.
question:Does the company have a professional product selection engineering team?
answer:Yes, we have a dedicated team of engineers specializing in market research and product optimization.
question:Why can other suppliers source discontinued models you can't provide?
answer:They may access remaining stock or refurbished units, which we avoid to ensure quality compliance.
question:Can I self-schedule official courier pickup for orders?
answer:No, all shipments are coordinated through our logistics partners to guarantee tracking and security.
question:Can the company ensure stable product supply?
answer:Yes, we maintain long-term partnerships and strict inventory management.
question:Why is there a transaction fee?
answer:The fee covers payment processing and administrative costs for secure transactions.
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