Valve Tappet
Stepped cylindrical follower transferring camshaft motion to the valve.
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 9 variants.
| Code | Diameter (mm) | Length (mm) | Feature | Tolerance | Std |
|---|---|---|---|---|---|
| OTOA-TAP-06 | 6 | 20 | 2 steps | h7 · ⌀6: 0/−0.012 | — |
| OTOA-TAP-07 | 7 | 23 | 2 steps | h7 | — |
| OTOA-TAP-08 | 8 | 26 | 2 steps | h7 | — |
| OTOA-TAP-10 | 10 | 28 | 2 steps | h7 | ground contact face |
| OTOA-TAP-12 | 12 | 30 | 2 steps | h7 | — |
| OTOA-TAP-12F | 12 | 36 | ⌀5 · 2 steps | h7 | oil hole ⌀5 |
| OTOA-TAP-14 | 14 | 34 | 2 steps | h7 | — |
| OTOA-TAP-16 | 16 | 30 | 2 steps | h7 · ⌀16: 0/−0.018 | ground contact face |
| OTOA-TAP-16H | 16 | 36 | ⌀6 · 2 steps | h7 · ⌀16: 0/−0.018 | hollowed lightweight type |
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 Tappet is a Automotive Precision Parts family precision-turned on a Goodway SW-20, covering 9 variants — diameters ⌀6–16 mm, lengths 20–36 mm, standard material Steel (also stainless 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 ⌀16 mm bar stock; its longest variant is OTOA-TAP-12F at 36 mm. Besides turning, the family requires axial drilling (⌀5–6 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 OTOA-TAP-06: 20 mm long at ⌀6 mm, L/D 3.3. 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 OTOA-TAP-06 (⌀6 mm) and the largest OTOA-TAP-16H (⌀16 mm). The family includes 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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