623 3x10x4mmフルセラミックミニチュア深溝玉軸受釣りリール用

623 Full Ceramic Ball Bearing – The Ultimate Fishing Reel Upgrade, Redefined

Enter the 623 Full Ceramic Silicon Nitride (Si3N4) 深溝玉軸受. This is not a standard bearing, nor is it a hybrid mixing steel and ceramic. It is a fully engineered ceramic rolling element where the inner race, outer race, and balls are all manufactured from high-grade Silicon Nitride. This “all-ceramic” construction solves the three fundamental problems of fishing reels: saltwater corrosion, friction-based drag, and rotational inertia.

主な特長:

• Extreme Saltwater & Corrosion Resistance
  Even premium 440C stainless steel will eventually pit, stain, or corrode in a saltwater environment. The Si3N4 material is chemically inert and completely impervious to seawater. The bearing can be immersed, rinsed, or forgotten without ever developing surface rust or pitting.

• 高速 & 軽量
  The density of Si3N4 ceramic is 3.2 g/cm3 versus 7.8 g/cm3 for steel. This weight reduction of up to 60% significantly reduces the rotational inertia of the spool. The high speed capability of these bearings is remarkable: Si3N4 bearings can achieve speeds up to 75,000 RPM while staying cool.

• Non-Magnetic & 電気絶縁性
  Unlike steel bearings that can retain residual magnetism and attract metallic dust or debris, full ceramic bearings are completely non-magnetic. They also offer full electrical insulation, although this is rarely a factor in fishing applications, it is essential for those who modify reels for specialty applications.

• Superior Heat Dissipation & Low Expansion
  The thermal expansion coefficient of Si3N4 is approximately 25% that of steel. High-speed fishing or hard fighting generates internal heat that normally causes steel bearings to expand and bind. Si3N4 bearings maintain their clearance and smooth rotation under high-speed loads.

Engineered for Fishing Reel Critical Positions

の 623 サイズ (3mm inner diameter, 10mm outer diameter, 4mm width) is one of the most versatile small bearing sizes in the fishing industry. It fits perfectly into multiple high-wear positions across both spinning and baitcasting platforms:

• Spool Support Bearings

• Handle & Crank Shaft Bearings

• Level Wind / Oscillation Mechanism Bearings