Valve Stem
Precision stem with conical seat for hydraulic/pneumatic system valves.
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 |
|---|---|---|---|---|---|
| OTOB-VST-05 | 5 | 24 | taper | h7 | valve stem with tapered seat |
| OTOB-VST-06 | 6 | 29 | taper | h7 · ⌀6: 0/−0.012 | valve stem with tapered seat |
| OTOB-VST-07 | 6 | 27 | M6x0.75 · taper | h7 · ⌀6: 0/−0.012 | valve stem with threaded end |
| OTOB-VST-08 | 8 | 32 | taper | h7 | valve stem with tapered seat |
| OTOB-VST-09 | 8 | 32 | M8x1 · taper | h7 · ⌀8: 0/−0.015 | valve stem with threaded end |
| OTOB-VST-10 | 10 | 37 | taper | h7 | valve stem with tapered seat |
| OTOB-VST-11 | 10 | 35 | M10x1 · taper | h7 · ⌀10: 0/−0.015 | valve stem with threaded end |
| OTOB-VST-12 | 12 | 42 | taper | h7 | valve stem with tapered seat |
| OTOB-VST-13 | 12 | 40 | M12x1.25 · taper | h7 · ⌀12: 0/−0.018 | valve stem with threaded end |
| OTOB-VST-14 | 14 | 45 | taper | h7 | valve stem with tapered seat |
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
Valve Stem is a Automotive Precision Parts family precision-turned on a Goodway SW-20, covering 10 variants — diameters ⌀5–14 mm, lengths 24–45 mm, standard material Stainless Steel (also steel, brass 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 ⌀14 mm bar stock; its longest variant is OTOB-VST-14 at 45 mm. Besides turning, the family requires thread turning (M6x0.75, M8x1, M10x1, M12x1.25) and taper turning. 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 OTOB-VST-06: 29 mm long at ⌀6 mm, L/D 4.8. 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 h7 tolerance; the smallest is OTOB-VST-05 (⌀5 mm) and the largest OTOB-VST-14 (⌀14 mm). The family includes threaded, tapered, 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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