Astro-Physics 18SCWT Stainless Steel Counterweights - 1.875" Shaft dia

Astro-Physics 18SCWT Stainless Steel Counterweights

Our counterweights are precision machined from 303 stainless steel. A bronze sleeve is press fit into the center hole to prevent marring of your counterweight shaft as you adjust the position of the counterweights. The weights slip easily onto the counterweight shaft and are secured in position with a large hand knob/brass pin assembly. The brass pin will not mar your shaft.
Keep in mind that you can adjust the position of the weights to counterbalance varying loads. However, the addition of a guidescope, camera and other heavy accessories may necessitate an additional counterweight. If you plan to mount your catadioptric, Newtonian or any other scope, figure that you will need a counterweight total equal to approximately 80% of the weight of your tube assembly and accessories. Below are the nominal weights and dimensions of our counterweight line.

Counterweights for 1.875" Diameter Shaft - 900, 1100, 1200, 1600 mounts (and Mach1GTO using optional shaft) :
Use these dimensions to determine how many counterweights will fit on each shaft. Note that the diameter of the 24 lb. counterweight is larger than the others:
5 lb. Counterweight (5SCWT) - diameter: 6", thickness: 0.75"
10 lb. Counterweight (10SCWT) - diameter: 6", thickness: 1.4"
18 lb. Counterweight (18SCWT) - diameter: 6", thickness: 2.5"
24 lb. Counterweight (24SCWT) - diameter: 6.8", thickness 2.5"
900 Counterweight Shaft (M9404-A) - usable length 12.875"
1200/1600 Counterweight Shaft (M12601-D) - usable length 18.5"