• Replace your GAUI X7 / NX7 Swashplate bearing with this high performance ABEC-5 deep groove ball bearing, with tighter tolerance, Longer life, and more smoothness.
• This "ABEC-5 Nitrile Rubber seal" bearing is pre-greased and is a direct drop in replacement for all X7/NX7 Swashplates.
• Black Nitrile Rubber seals on both sides of the bearing to keep all the dust and debris out, this helps protect the bearing from premature failure.
• Size: B30x42x7
• Fits All Gaui X7 Swashplates
• Upgrades part# 217510
  

If a retailer/vendor does not specify an ABEC rating, it's likely that's it's ABEC-1, or worse, not even rated!  Most helicopter kits come standard with ABEC-1 rated bearings. ABEC-5 bearings are much tighter in tolerance than ABEC-1 bearings, thus providing much higher accuracy, longer life, better efficiency, and ultra smoothness.

Chart below shows differences in tolerance levels between abec ratings.