521-B Spherical Mount

Estimated lead time:
30 days
Ships in 2 Weeks

For alignment telescopes and targets

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. The 2022 is classified as National Stock Number (NSN) 4920-01-013-0448.

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.


May Be Used With

560-2 Cup Mount with 565 Spring Clamp
705, 705-1, 707 family, 714, and 6130 disk targets

5150 and 5170 Alignment Telescope Bases

5180 Alignment Telescope Base (discontinued)


Concentricity of I.D. to O.D. 0.0005" (0.013 mm) TIR maximum. Distance from center of sphere to squared face: 1.000" +0.005" -0.000" (25.4 mm, +0.127 mm -0.000 mm)
Finish Black Oxide
Inside diameter 2.2500" +0.0005" -0.0000 (57.2 mm, +0.013 mm -0.000)
Material Heat-treated Steel
Outside Diameter 3.5000" +0.0005", -0.0000 (88.9 mm, +0.013 mm -0.000)
Weight, Product (Approx.) lb 3
Weight, Product (Approx.) kg 1.4
Weight, Shipping (Approx.) lb 4
Weight, Shipping (Approx.) kg 1.8
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