Lens Retainer Ring
Internally threaded knurled retaining ring securing a lens in its seat.
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 12 variants.
| Code | Diameter (mm) | Length (mm) | Feature | Tolerance | Std |
|---|---|---|---|---|---|
| OPTB-LRT-01 | 8 | 3 | knurl · ⌀5 | 6H | M6x0.5 internal thread |
| OPTB-LRT-02 | 10 | 3.5 | knurl · ⌀7 | 6H | M8x0.5 internal thread |
| OPTB-LRT-03 | 12 | 4 | knurl · ⌀9 | 6H | M10x0.5 internal thread |
| OPTB-LRT-04 | 12 | 5 | knurl · ⌀9 | 6H | M10x0.5 internal thread, wide |
| OPTB-LRT-05 | 14 | 4 | knurl · ⌀11 | 6H | M12x0.5 internal thread |
| OPTB-LRT-06 | 14 | 6 | knurl · ⌀11 | 6H | M12x0.5 internal thread, coarse |
| OPTB-LRT-07 | 16 | 5 | knurl · ⌀12.5 | 6H | M14x0.5 internal thread |
| OPTB-LRT-08 | 16 | 7 | knurl · ⌀12.5 · 2 steps | 6H | shouldered, M14x0.5 |
| OPTB-LRT-09 | 18 | 6 | knurl · ⌀14.5 | 6H | M16x0.5 internal thread |
| OPTB-LRT-10 | 18 | 7 | knurl · ⌀14.5 | 6H | M16x0.5 internal thread, coarse |
| OPTB-LRT-11 | 20 | 6 | knurl · ⌀16.5 | 6H | M18x0.5 internal thread |
| OPTB-LRT-12 | 20 | 10 | knurl · ⌀16.5 · 2 steps | 6H | shouldered retainer, M18x0.5 |
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
Lens Retainer Ring is a Opto-Mechanical Parts family precision-turned on a Goodway SW-20, covering 12 variants — diameters ⌀8–20 mm, lengths 3–10 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-LRT-12 at 10 mm. Besides turning, the family requires knurling. Bores in this family run ⌀5–16.5 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-LRT-12: 10 mm long at ⌀20 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 6H tolerance; the smallest is OPTB-LRT-01 (⌀8 mm) and the largest OPTB-LRT-12 (⌀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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