| Materials | Aluminum alloy 6061 and 7075, stainless steel 304 and 316, brass, or another grade named on the drawing |
| Process | CNC turning, groove cutting, cross-hole drilling and thread cutting |
| Surface finish | Polishing, coating, decorative anodizing, hard anodizing, passivation, or an as-machined finish |
| Tolerance | According to the drawing. Critical features can be held to tight tolerances, including ±0.005 mm where required |
| Inspection | Dimensional inspection before shipment. Material certificates and inspection records can be provided on request |
| Order type | Samples, small batches and repeating OEM production |
Process planning and inspection follow the same factory quality system used for our other manufactured components. Background on the plant and quality documents is available on our factory introduction and quality control and technical documentation pages. We are a manufacturer, not a trading-only office; this point is also explained in the FAQ Are you a manufacturer or a trading company?
Which applications do these parts serve?
These pins, shafts and fittings are commonly used in pumps, valves, fluid and gas systems, industrial equipment and automotive assemblies. The function, fit and sealing method are defined by the customer design. We machine to the drawing or sample and do not change the design unless the customer asks us to review it.
What should you send to get a quotation?
A photo or a 3D file is useful for understanding the shape, but it is usually not enough on its own for a reliable quote. Please send the following to sales@scyuncheng.com, or contact us on WhatsApp at +8618628088808:
A 2D drawing, a 3D file, or a clear photo of the sample. If a physical sample is available, it can be measured before quoting.
Material and surface-finish requirements, including coating, polish or anodizing if already decided.
Quantity for the sample and for later batch production.
Critical diameters, the thread standard, and any runout or inspection requirement. Please mark whether those dimensions must be held before or after surface treatment.
The target delivery date and the shipping destination.
We can review the files or the sample, confirm the process route and quote samples first. After the sample is approved, batch production can start.
FAQ
How should runout or concentricity be specified on a custom turned shaft?
A concentricity callout is often difficult to inspect and is not always the clearest way to control a shaft. For most pins and shouldered shafts, it is more practical to name the datum diameters and state a circular or total runout, or a position tolerance, on the diameters that must run true. Please assign a tight runout only to the features that actually control assembly or rotation. If a very tight value is required, tell us how the feature will be inspected, so the quote and the inspection plan use the same method.
Will coating or plating change the diameter of turned pins and fittings?
Yes. Anodizing, plating and many coatings add thickness on the machined surface. On a turned diameter, this change affects the outside size and can also change a thread fit or a press fit. The added thickness depends on the finish type and process. If a pin, journal or thread has a tight tolerance, the drawing should state whether the dimension applies before or after finishing. We can machine with an allowance and inspect the part after finishing when this is required. Masking can also be discussed if a fit surface must stay uncoated.
Can you make turned pins or fittings from a sample if there is no drawing?
Yes, a physical sample can be used as the starting point when a drawing is not available. We measure the key features and confirm the material, quantity, finish and the diameters that must fit before production. A worn or damaged sample may no longer show the original size, so please tell us which features are critical and, if you know it, the original material grade. After the sizes are confirmed, we can quote a sample first and then start batch production.
To start a project, send the drawing or sample details to sales@scyuncheng.com or message WhatsApp +8618628088808. You can also use the contact page.
