There are three basic variations of the tilter head: Standard, Spring and HD Spring. All three units share much in common. Two spring-type tilters are offered with the Long Monitor Arm SAA4229. They have the same range of motion and both use a friction resistance set screw that is tightened and loosened to accommodate the desired degree of effort the user will exert to move the monitor from one tilted angle to the next.
When considering the two options, be mindful of the thickness of your monitor or device. A very thin (2" thick) LED or LCD monitor weighing 25 pounds will work just fine with the Spring Tilter with its maximum rating of 35 pounds; however, an all-in-one computer (panel PC or iMac) or Touch Screen that weighs 25 pounds and is 5" thick would probably create too much leverage and would be a better match for the higher rated HD Spring Tilter. If you anticipate constant use of the tilt function and want smooth ease of use with a heavier monitor, you should opt for the HD Spring Tilter. Likewise, payloads that are effectively "thicker" create added leverage.
Generally speaking, a user who wants complete ease of use when adjusting the tilt of a 30 pound iMac or a similar weight "all-in-one" computer should select the HD Spring Tilter.
Call for further information and recommendations: 888 420 3200.