4x9x4mm Stainless Steel Bearing - Metal Shields - SMR684zz - Precision Bearing
4,32 €
Part Number SMR684ZZ. This is the standard steel for most ball bearings. It also has superior low noise qualities to standard 440 grade stainless steel. RC Bearing Kits. There are many theories on what makes a good bearing, but putting it to the test in the harshest conditions possible is the only way to practically assess whether a bearing will stay in one piece or not.
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