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The SR188 bearing is a 1/4″ x 1/2″ x 3/16″ (6.35 x 12.7 x 4.763 mm) open stainless steel bearing made from heat-hardened 440C stainless stock. It’s a special close-clearance (MC-1) bearing designed primarily for John Milner center pin reels and other applications that need a precise radial fit. If smooth, true rotation matters in your build, this is the bearing to choose.
Our SR188 bearing is made from 440C stainless steel, which becomes highly corrosion resistant once it has been hardened. That makes it a strong choice for use around water, damp conditions, and changing temperatures, where standard steel bearings are more likely to rust. You don’t give up durability for that protection, either: 440C offers wear resistance comparable to standard bearing steel, so the bearing lasts just as long in regular use.
Radial clearance is the small amount of internal play between the balls and the races of a bearing. An MC-1 bearing has a close radial fit, which means less wobble and truer rotation. In a center pin reel, that precision helps the spool spin freely and evenly, so line feeds smoothly as the float travels downstream. The same close fit is valuable in any application where accuracy and minimal play are important.
An open SR188 bearing has no shields or seals, which gives you the lowest friction and the freest possible spin. Open bearings are also easy to inspect, clean, and lubricate. The trade-off is that they’re more exposed to dirt and grit, so regular cleaning is important to keep them running at their best.
Even corrosion-resistant stainless steel benefits from a little care. After using your reel in wet conditions, dry it thoroughly and keep it somewhere dry. Clean the bearing from time to time to remove dirt and old lubricant, then apply a drop of light oil to keep it spinning smoothly.
What’s the difference between SR188 and R188?
Both are the same size. The “S” in SR188 means stainless steel, while the R188 is the standard steel version.
Can I use the SR188 outside fishing reels?
Yes. It suits any application that calls for a 1/4″ x 1/2″ x 3/16″ bearing with a close radial fit and good corrosion resistance.
Browse our full range of [Stainless Steel Bearings] for more miniature and specialty bearings, all in stock and ready to ship nationwide. For help choosing the right bearing, call us at (+1) 978-254-3987.
| Weight | 0.1 oz |
|---|---|
| UPC | 704088040797 |
| Id | |
| Od | |
| Th | |
| Enclosure | |
| Ball mtl | |
| Race mtl | |
| Retainer mtl |
RCBearing provide high-precision, high-quality anti-friction Bearings with exclusive range.
© 2025 RCBearing . All Rights Reserved.
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