Threaded Valve Stem
Rotary-actuated valve stem with a threaded adjustment neck and knurled grip.
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 |
|---|---|---|---|---|---|
| VALA-STM-04 | 8 | 24 | M4 · knurl | 6g | knurled adjusting shaft |
| VALA-STM-05 | 9 | 28 | M5 · knurl | 6g | knurled adjusting shaft |
| VALA-STM-06 | 10 | 32 | M6 · knurl | 6g | knurled adjusting shaft |
| VALA-STM-06H | 11.5 | 30 | M6 · SW10 | 6g | AF10 hex-head shaft |
| VALA-STM-08 | 12 | 37 | M8 · knurl | 6g | knurled adjusting shaft |
| VALA-STM-10 | 15 | 42 | M10 · knurl | 6g | knurled adjusting shaft |
| VALA-STM-08H | 15 | 35 | M8 · SW13 | 6g | AF13 hex-head shaft |
| VALA-STM-12 | 18 | 47 | M12 · knurl | 6g | knurled adjusting shaft |
| VALA-STM-10H | 19.6 | 40 | M10 · SW17 | 6g | AF17 hex-head shaft |
| VALA-STM-12L | 20 | 56 | M12 · knurl | 6g | long-stroke adjusting shaft |
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
Threaded Valve Stem is a Valve Parts family precision-turned on a Goodway SW-20, covering 10 variants — diameters ⌀8–20 mm, lengths 24–56 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 VALA-STM-12L at 56 mm. Besides turning, the family requires thread turning (6 sizes from M4 to M12), hex flat milling (AF 10–17) and knurling. 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 VALA-STM-06: 32 mm long at ⌀10 mm, L/D 3.2. This ratio is achievable on a conventional lathe as well; the sliding-head advantage in series work is that the part never leaves the machine, so the size does not drift from variant to variant.
Variants are machined to 6g tolerance; the smallest is VALA-STM-04 (⌀8 mm) and the largest VALA-STM-12L (⌀20 mm). The family includes threaded, hex-drive, knurled, 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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