S688 8x16x5 mm Stainless Steel Miniature Deep Groove Ball Bearing

Product Overview

S688 Stainless Steel Deep Groove Ball Bearing – 8x16x5mm, Corrosion Resistant. Made of AISI 440C stainless steel with rubber seals (2RS). Low noise, high speed, and maintenance‑free. Ideal for food machinery, medical devices, marine equipment, and precision instruments.

Core Advantages:

• Corrosion Resistance
  The most obvious advantage of the S688 over standard 688 (chrome steel) bearings is its ability to resist rust and oxidation. Made from AISI 440C stainless steel – this bearing can operate in humid environments, direct water spray, steam cleaning, and even mild chemical exposures. It is passivated after grinding to further enhance surface protection. For food processing, marine, or outdoor applications, the S688 is a reliable, long-term solution.

• High Hardness & Wear Resistance
  Unlike low?end stainless bearings that use softer 304 or 316 steel (which cannot be through?hardened), AISI 440C is heat treatable to 58–62 HRC. This gives the raceways and balls exceptional wear resistance and load capacity – comparable to standard chrome steel bearings. You don’t have to sacrifice durability for corrosion resistance.

• Low Noise & Smooth Operation
  Precision-ground raceways and grade 10 (or better) stainless steel balls ensure low vibration and quiet running. This makes the S688 suitable for medical equipment (dental handpieces, surgical saws), laboratory instruments, and any noise-sensitive application. Running noise is typically below 25 dB at moderate speeds.
• Compact & Lightweight
  With an 8mm bore and only 5mm width, the S688 fits into tight spaces where larger bearings cannot. Its small size and low weight (approx. 5 grams) make it ideal for portable devices, miniature conveyors, and robotic joints.

Applications

• Food Processing Equipment
  Conveyor rollers, filling machine guides, bottle capping turntables, dough sheeters, and meat slicers. The stainless steel and food?grade grease option meet strict sanitary standards.

• Medical & Dental Devices
  Surgical handpieces, orthopedic saws, dental turbines, laboratory centrifuges, and fluid pumps. Low noise and smooth rotation are critical here.

• Marine & Subsea Equipment
  Underwater cameras, ROV thrusters, boat steering components, and desalination plant valves. Saltwater resistance is essential.

• Pharmaceutical Manufacturing
  Tablet press guides, capsule filling machines, and cleanroom conveyors. Stainless steel prevents particle shedding and corrosion from cleaning agents.

• Chemical & Semiconductor Industry
  Wet bench rollers, etching equipment, and chemical pumps where mild acids or alkalis are present.
• Outdoor & Agricultural Automation
  Wet bench rollers, etching equipment, and chemical pumps where mild acids or alkalis are present.