Silicon Nitride Balls



These 0.5” (12.7 mm) diameter silicon nitride balls are Grade 5, the best quality available as a
commodity item. The balls are round to 125 nm with a surface finish of 1.25 nm rms. They are
near diffraction-limited convex mirrors with a reflectivity of about 11%, more than enough for
most applications with the PSM. As with the steel balls, they are ideal for use with the PSM in
transferring optical to mechanical datums, and vice versa to better than 1 µm. They are superior
to steel balls in that they are virtually indestructible and resist stains, corrosion, and fingerprints.
The silicon nitride balls are non-magnetic, so they do not work with magnetic nests without
clamping unless the kinematic support is moderately centered under the ball.
We generally have these in stock, but occasionally there is an extended lead time.

Worldwide Representatives


Armstrong Optical
+44(0) 1604 654220

All Asian Countries Except China

清 原 耕 輔   Kosuke Kiyohara
清原光学 営業部   Kiyohara Optics / Sales

Kiyohara Optics Inc.
3-28-10 Funado Itabashi-Ku Tokyo, Japan 174-0041


Langxin (Suzhou) Precision Optics Co., Ltd
1st floor, Building 10, Yisu Science and Technology Innovation Park, 100 meters west of the intersection of Xinhua Road and Weimeng Road, Kunshan City, Suzhou City, Jiangsu Province, 215345

Telephone: +860512-57284008
Contact: Wang Zengkun

Australia & New Zealand

Mersenne Optical Consulting


Fiber Optic Services
Joshi Pravin:

Optical Perspectives Group, LLC

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