They list the 485 as "top ball bearing", the 475 used to be listed as "Dual Ball Bearing". Of course, in searching for the 475 on their site, it now says it was top ball bearing also.


From their website: http://www.hitecrcd.com/servos/show?name=HS-485HB

HS-485HB

HS-485HB updates the very popular HS-475HB by adding more torque and greater speed. With a top ball bearing, heavy duty, high impact Karbonite™ gears and high performance circuitry, the HS-485HB offers lots of torque and features excellent centering and resolution.

*See Karbonite guidelines below


Detailed Specifications

Motor Type: 3 Pole
Bearing Type: Top BB
Speed: 0.20 , 0.17 sec @ 60 deg.
English Metric
Torque: 72 / 89 (4.8v / 6.0v)



Detailed Feature Descriptions
Applications: Heli's and Aircraft up to 72” or up to 12lbs when using just one servo per control surface.

Note: Be aware that high vibration gas (not glow) engines combined with large contol surfaces and large thows (3D models) can put undue strain on the gears. Metal geared servos are recommended for these applications even if under 12lbs.

Warning: Do not use thread lockers on Karbonite geared servo as it will cause the output shaft to fail.