521-B Spherical Mount

For alignment telescopes and targets

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521-B Spherical Mount

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Mounting flexibility is what you get with the 521-B spherical mount. It is compatible with any 2¼" alignment telescope or collimator, allowing you to position your telescope in the many orientations your application may require.  The spherical mount also functions as a target holder for alignments requiring precision target fixtures. It has three radial setscrews at approximately 120 degree intervals, as well as three "axial" setscrews in a line along the length of the sphere. This allows for accurate and flexible target positioning.  Often used with our cup mount 560-2.  Conforms to all A.I.A. standards.

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Although it may be used in many different mounting configurations, the 521-B Spherical Mount at left is shown holding a 2022 Alignment Telescope in a 5170 base.  The highlighted portion shows a 521-B Spherical Mount, a 565 Spring Clamp, and a 560-2 Adjustable Cup Mount.

Specifications

Outside diameter:  3.5000" +0.0005", −0.0000  (88.9mm, +0.013mm −0.000)

Inside diameter:  2.2500" +0.0005" −0.0000  (57.2mm, +0.013mm −0.000)

Concentricity of I.D. to O.D.: 0.0005" (0.013mm) TIR maximum.
Distance from center of sphere to squared face: 1.000" +0.005" -0.000" (25.4mm, +0.127mm - 0.000mm)

Material:  Heat-treated steel

Finish:  Black oxide

Approx. weight:  Sphere, 3 lbs (1.4 kg); shipping, 4 lbs (1.8 kg)

May be used with...

  • 5150 and 5170 Alignment Telescope Bases
  • 5180 Alignment Telescope Base (discontinued)