Diaphragm Ring
Knurled fixed-aperture diaphragm ring with a central through-bore.
This is a dimension schematic, not a manufacturing drawing. Dimensions match the catalog data; request a quote with the part code to confirm before production.
Code & Size Table
Code, dimensions and tolerance for all 10 variants.
| Code | Diameter (mm) | Length (mm) | Feature | Tolerance | Std |
|---|---|---|---|---|---|
| OPTA-DIA-08 | 8 | 4 | knurl · ⌀2 | h7 · ⌀8: 0/−0.015 | aperture 2 mm |
| OPTA-DIA-10 | 10 | 4 | knurl · ⌀3 | h7 · ⌀10: 0/−0.015 | aperture 3 mm |
| OPTA-DIA-12 | 12 | 4.5 | knurl · ⌀4 | h7 · ⌀12: 0/−0.018 | aperture 4 mm |
| OPTA-DIA-13 | 13 | 4.5 | knurl · ⌀5 | h7 · ⌀13: 0/−0.018 | aperture 5 mm |
| OPTA-DIA-14 | 14 | 5 | knurl · ⌀6 | h7 · ⌀14: 0/−0.018 | aperture 6 mm |
| OPTA-DIA-15 | 15 | 5 | knurl · ⌀7 | h7 · ⌀15: 0/−0.018 | aperture 7 mm |
| OPTA-DIA-16 | 16 | 5 | knurl · ⌀8 | h7 · ⌀16: 0/−0.018 | aperture 8 mm |
| OPTA-DIA-17 | 17 | 5.5 | knurl · ⌀9 | h7 · ⌀17: 0/−0.018 | aperture 9 mm |
| OPTA-DIA-18 | 18 | 5.5 | knurl · ⌀10 | h7 · ⌀18: 0/−0.018 | aperture 10 mm |
| OPTA-DIA-20 | 20 | 6 | knurl · ⌀12 | h7 · ⌀20: 0/−0.021 | aperture 12 mm |
Prices are for approved members.
Material & Tolerance
The standard material is listed below; also available in steel, stainless, brass and aluminium. Dimensions in mm; tolerances machined to ISO. Deviations (mm) are given for the nominal diameter according to the ISO 286-2 tables; thread tolerances (6g/6H) are to ISO 965. For custom sizes/tolerances, contact us with the part code.
Manufacturing Scope
Diaphragm Ring is a Opto-Mechanical Parts family precision-turned on a Goodway SW-20, covering 10 variants — diameters ⌀8–20 mm, lengths 4–6 mm, standard material Brass (also steel, stainless steel or aluminium). Every variant's part code, dimension and tolerance is listed below; request a quote with the code you need.
The family is machined from ⌀20 mm bar stock; its longest variant is OPTA-DIA-20 at 6 mm. Besides turning, the family requires knurling. Bores in this family run ⌀2–12 mm. All of it is completed in a single setup, without the part leaving the machine.
The variant with the highest length-to-diameter ratio is OPTA-DIA-08: 4 mm long at ⌀8 mm, L/D 0.5. A short, rigid body: what governs the result here is not deflection but diameter tolerance and surface finish.
Variants are machined to h7 tolerance; the smallest is OPTA-DIA-08 (⌀8 mm) and the largest OPTA-DIA-20 (⌀20 mm). The family includes knurled, bored variants. Custom sizes, tolerances or materials are produced to the part code on request.
Need a size that isn't listed? We machine to your drawing — CNC contract machining. How these parts are made: What is a Swiss-type lathe?
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