Automotive Precision Parts — CNC Swiss Lathe Manufacturing
Injector pins, valve tappets, bearing bushings and more: ⌀1–20 mm automotive precision parts machined in steel, stainless, brass and aluminum.
Part Families
Injector Pin
Precision cone-tipped pin guiding needle/valve motion in fuel injectors.
⌀4–10 · L 21–52 mm
8 types
Valve Tappet
Stepped cylindrical follower transferring camshaft motion to the valve.
⌀6–16 · L 20–36 mm
9 types
Rocker Arm Pin
Pivot pin bearing the rocker arm, threaded or knurled at the end.
⌀5–12 · L 30–56 mm
9 types
Eccentric Pin
Off-center stepped pin for adjustable eccentric linkage.
⌀6–16 · L 22–44 mm
8 types
Bearing Bush
Bored, often flanged precision sleeve bush for shaft bearing.
⌀8–20 · L 12–25 mm
8 types
Piston Gudgeon Pin
Hollow hardened gudgeon pin connecting piston to connecting rod.
⌀4–16 · L 16–52 mm
8 types
Valve Guide
Bored bush with press-fit outer diameter guiding the valve stem.
⌀5–16 · L 24–60 mm
8 types
Sensor Body
Threaded precision body with through-bore for ABS/speed sensors.
⌀15–20 · L 19–40 mm
10 types
ABS Pin
Stepped hardened locating pin for ABS wheel-speed sensor.
⌀4–12 · L 15–39 mm
10 types
Connector Pin
Brass conductive contact pin for automotive electrical connectors.
⌀3–12 · L 20–32 mm
10 types
Adjusting Screw
Fine-thread set screw with hex head for precision adjustment.
⌀8.1–19.6 · L 16–37 mm
10 types
Brake Piston Tip
Internally threaded push tip with conical seat for caliper piston.
⌀8–20 · L 12–24 mm
10 types
Spacer Bush
Bored spacer bush for axial clearance setting in system assemblies.
⌀6–20 · L 8–22 mm
10 types
Valve Stem
Precision stem with conical seat for hydraulic/pneumatic system valves.
⌀5–14 · L 24–45 mm
10 types
Enter ⌀ and L to list matching variants with code and tolerance.
Search this category by sizeAutomotive precision parts are small-diameter turned components in engine, fuel, braking and sensor systems that must fit together to within microns. This category covers 14 families and 128 types: injector pins, valve tappets, rocker and camshaft pins, bearing bushings, piston gudgeon pins, valve guides, sensor bodies, ABS pins, connector pins, adjusting screws, brake piston tips, spacer bushings and valve stems. The parts are machined for automotive suppliers, engine reconditioners and equipment makers in steel, stainless steel, brass and aluminum. Depending on function we hold fit classes such as h6/H7; ±0.01 mm is targeted on critical diameters, with surface hardening and low Ra roughness where required. Every part is CNC-turned on the Goodway SW-20 Swiss lathe in the ⌀1–20 mm bar range, in a single setup. Alongside the 128 standard types we also produce custom sizes from your technical drawing. The process is simple: send a drawing or sample, and we quote by material and quantity.
Across 128 variants the operation mix is 32× thread turning, 22× hex flat milling, 63× axial bore, 29× taper turning, 8× knurling. Parts run 8–60 mm long; the longest, OTOA-VLK-16 at 60 mm, still finishes in a single setup.
Tolerances span 8 classes (6g, H7, h6, h7, h8, h9, js9, s6) and 121 variants carry a DIN or ISO reference. The highest length-to-diameter ratio in the category belongs to OTOA-INJ-04L at L/D 9 — slender enough to need tailstock support on a conventional lathe.
Every part is CNC-turned to your drawing — series, small batches and custom turned parts. Send your drawing (PDF/DWG/STEP) for a quote.
Frequently Asked Questions
All parts are produced on a Goodway SW-20 CNC Swiss lathe. A sliding-headstock lathe cuts the bar right next to the guide bushing, which reduces deflection on long, slender parts; that is what makes tight tolerances and low surface roughness achievable on pins, bushings and shafts in the ⌀1–20 mm range.
Free-cutting and alloy steels, stainless steel (304/316 and similar), brass and aluminum are machined as standard. We advise on material based on the part's operating environment, steering you toward stainless or brass for corrosion, wear or conductivity needs. We also evaluate requests for special alloys.
Depending on function we hold fit classes such as h6/H7; ±0.01 mm is targeted on critical diameters. For mating parts like bearing bushings and pins we confirm the assembly fit together from your drawing. Surface hardening and low Ra roughness values are provided where required.
Yes. The 128 types are a reference; actual production follows your technical drawing. Within the ⌀1–20 mm range we manufacture custom parts to the dimensions, tolerances and material you specify. We can also reverse-dimension from a sample or a worn original part.
We have manufactured in Düzce, Turkey since 2009 and handle both prototype/sample quantities and series orders, with no fixed minimum imposed. Lead time depends on part complexity, material sourcing and quantity, and is stated clearly in the quote. Pricing is quote-based; we ship domestically and export.
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