SKF W 618/9 9x17x4 Stainless Steel Deep-Groove Ball Bearing

Main Description

The SKF W 618/9 9x17x4 is a miniature stainless steel deep-groove ball bearing designed for demanding industrial applications that require compact size, corrosion resistance, smooth rotation and long service life. Searches such as “miniature stainless bearing 9x17x4,” “W 618/9 SKF bearing,” “stainless deep groove ball bearing 9 mm,” “bearing for small motors 9x17x4,” and “SKF stainless steel bearing W618/9” reflect a consistent demand for this type of high-quality, small footprint bearing.

Built entirely from stainless steel — rings, balls, and cage — this bearing is specially engineered for harsh environments involving moisture, chemicals, high humidity, or corrosive agents. Its deep-groove design allows it to carry radial and axial loads in both directions, while maintaining low friction, stable rotation, minimal vibration and high permissible speeds.

With internal diameter 9 mm, outer diameter 17 mm, and width 4 mm, W 618/9 is ideal for micro-motors, gearboxes, small pumps, compact drives, precision machinery, medical devices, food-industry equipment, automation systems, and other compact assemblies where space is limited but reliability, corrosion resistance, and precision are critical.

This bearing is also a great fit for industrial automation, small electric motors, robotics, small gear reducers, instrument drives, handheld power tools, and small appliances — wherever a robust, stainless-steel, high-speed ball bearing is required.

Technical Specification

• Type: Single-row deep-groove ball bearing (miniature)

• Dimensions: 9 x 17 x 4 mm (bore x outer diameter x width)

• Material: Stainless steel (inner/outer ring, balls, cage) — full corrosion and chemical resistance

• Dynamic load rating: ~761 N

• Static load rating: ~335 N

• Limiting speed: up to 53 000 rpm — suitable for high-speed applications

• Load capacity: radial and axial in both directions, with stable and low-noise rotation

Advantages & Business Benefits

• High corrosion and chemical resistance — stainless steel design makes it ideal for humid, wet, corrosive or chemically aggressive environments.

• Low friction and quiet operation — deep-groove geometry ensures smooth rotation and efficient energy use.

• Compact & lightweight — perfect for small machinery, tight assemblies, or designs with limited space.

• Versatile load handling — capable of handling both radial and axial loads, expanding its usability across many applications.

• High-speed capable — suitable for motors, gearboxes, turbines, fans, and other fast-rotating assemblies.

• Long service life & durability — low wear and minimal maintenance requirements.

FAQ

Q: What does “W” mean in SKF W 618/9?
A: The “W” prefix indicates the bearing is made of stainless steel — inner and outer rings, balls and cage — ensuring full corrosion and chemical resistance.

Q: What are typical uses for 9x17x4 mm stainless bearings?
A: Small motors, gearboxes, precision instruments, miniature drives, automation equipment, pumps, medical devices, food-industry machinery — any application where compactness and reliability matter.

Q: What loads can this bearing carry?
A: It supports radial loads and moderate axial loads in both directions; deep-groove design maintains stable operation under combined loads.

Q: Is it suitable for high-speed applications?
A: Yes — with a limiting speed up to 53,000 rpm, it meets requirements for high-speed electric motors, turbines, fans or precision spindles.

Q: How resistant is it to moisture and corrosive environments?
A: Thanks to full stainless-steel construction, it performs reliably in wet, humid, or chemically aggressive conditions — ideal for outdoor, marine, food-processing, or chemical-industry applications.