Pinhole Aperture
Beam-limiting optical aperture disc with a precise central 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 11 variants.
| Code | Diameter (mm) | Length (mm) | Feature | Tolerance | Std |
|---|---|---|---|---|---|
| OPTB-PIN-01 | 6 | 2 | ⌀0.5 | h7 · ⌀6: 0/−0.012 | 0.10 mm pinhole |
| OPTB-PIN-02 | 8 | 2 | ⌀0.5 | h7 · ⌀8: 0/−0.015 | 0.20 mm pinhole |
| OPTB-PIN-03 | 10 | 2.5 | ⌀0.5 | h7 · ⌀10: 0/−0.015 | 0.30 mm pinhole |
| OPTB-PIN-04 | 12 | 3 | ⌀0.5 | h7 · ⌀12: 0/−0.018 | 0.50 mm pinhole |
| OPTB-PIN-05 | 12 | 4.5 | ⌀0.75 · 2 steps | h7 | stepped, 0.75 mm |
| OPTB-PIN-06 | 14 | 3 | ⌀1 | h7 · ⌀14: 0/−0.018 | 1.00 mm pinhole |
| OPTB-PIN-07 | 14 | 5.5 | ⌀1.5 · 2 steps | h7 | stepped, 1.5 mm |
| OPTB-PIN-08 | 16 | 4 | ⌀2 | h7 · ⌀16: 0/−0.018 | 2.00 mm diaphragm |
| OPTB-PIN-09 | 16 | 4 | knurl · ⌀2.5 | h7 · ⌀16: 0/−0.018 | knurled edge, 2.5 mm |
| OPTB-PIN-10 | 18 | 4 | ⌀3 | h7 · ⌀18: 0/−0.018 | 3.00 mm diaphragm |
| OPTB-PIN-11 | 20 | 5 | knurl · ⌀4 | h7 · ⌀20: 0/−0.021 | knurled, 4.0 mm field diaphragm |
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
Pinhole Aperture is a Opto-Mechanical Parts family precision-turned on a Goodway SW-20, covering 11 variants — diameters ⌀6–20 mm, lengths 2–5.5 mm, standard material Aluminium (also steel, stainless steel or brass). 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 OPTB-PIN-07 at 5.5 mm. Besides turning, the family requires knurling and axial drilling (⌀0.5–4 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 OPTB-PIN-07: 5.5 mm long at ⌀14 mm, L/D 0.4. 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 OPTB-PIN-01 (⌀6 mm) and the largest OPTB-PIN-11 (⌀20 mm). The family includes knurled, bored, multi-step 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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