Optics & optical coatings

Guide | Technical Referance

Outer Dimension Tolerance and Standard Chamfer Company Standard

All products produced by Sigma Koki are inspected with valid metrology instruments that have supporting traceability. Instruments and supporting equipment in our metrology department are calibrated by their respective manufacturers or certified laboratories. Our maintenance program ensures that the level of accuracy is always at optimum levels.
It is possible to request for a Calibration Inspection Certificate for the metrology instrument used against any of our products inspected. (Please note that that will be a small fee for this request)

Optical Flats | Optical Parallels | Wedged Substrates | Concave Mirror and Substrates
(Applies to Other Standard Coated Optics Also)

Outer Dimension Tolerance (mm)
Round Shaped Dimension Tolerance Thickness Tolerance
φ50 0 to -0.1 ±0.1 (Concave mirror and its substrate is +/-0.2)
φ51 to 150 0 to -0.2 ±0.2
φ151 to 200 0 to -0.3 ±0.3
φ201 to 300 0 to -0.5 ±0.5
* Tolerance of center thickness for standard Concave mirror and its substrate is +/-0.2
Square or Rectangular Shaped Dimension Tolerance Thickness Tolerance
<=50 0 to -0.1 ±0.1 (Concave mirror and its substrate is +/-0.2)
51 to 150 0 to -0.2 ±0.2
151 to 200 0 to -0.3 ±0.3
201 to 300 0 to -0.5 ±0.5
* Outside tolerance of 50×60 size is 0 to -0.2
Standard Chamfer (mm)
Thickness Dimension Standard Chamfer
1.0 to 3.0 Specify <=0.3×45°
3.1 to 5.0 <=40 <=0.3×45°
41 to 70 <=0.4×45°
71 to 100 <=0.5×45°
101 to 150 0.2 to 0.6×45°
151 to 200 0.3 to 0.7×45°
201 to 300 0.4 to 0.8×45°
<=5.1 <=40 <=0.3×45°
41 to 70 <=0.4×45°
71 to 100 <=0.5×45°
101 to 150 0.3 to 0.7×45°
151 to 200 0.4 to 0.8×45°
201 to 300 0.5 to 1×45°

Caution1: Chamfer of concave mirror is identical to Spherical Lens.
Caution2: Chamfer finish is for protection to suffer from chipping, and the amount of chamfer may vary.

Spherical Lens | Cylindrical Lens

Outer Dimension Tolerance (mm)
Size Dimension Tolerance
<=60 0 to -0.1
61 to 80 0 to -0.15
81 to 100 0 to -0.2
101 to 200 0 to -0.25
201 to 300 0 to -0.3
Standard Chamfer (mm)
  Diameter Standard Chamfer
Convex-side <=50 <=0.3×45°
51 to 100 <=0.4×45°
101 to 150 <=0.5×45°
151 to 200 0.3 to 0.6×45°
201 to 300 0.4 to 0.7×45°
Concave-side,
Flat-side
<=50 <=0.3×45°
51 to 100 <=0.5×45°
101 to 150 0.3 to 0.6×45°
151 to 200 0.4 to 0.8×45°
201 to 300 0.6 to 1×45°
* Some standard parts has other tolerance than above data.

Prism

About Outer Dimension Tolerance

Prisms have sharp edges because of its function and therefore usually needs protective bevels.
Outer dimensions of prisms are noted by length without bevels.

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