Sandblasted (uniform matte finish)
Used to obtain a more uniform matte texture and weaken local knife lines; suitable for exterior parts and decorative surfaces.
303 Stainless Steel
303 Stainless Steel is a typical easy-to-machine stainless steel.
Quote checklist: Upload your 3D model and, when available, a 2D drawing. Identify the required process, material, quantity, critical dimensions, finish, appearance standard, and target delivery date.
Key Material and Manufacturing Parameters
Engineering note: Values below are typical reference ranges. Final manufacturability, tolerances, material condition, surface finish, cost, and lead time depend on the drawing, geometry, quantity, and selected process.
Upload CAD files and mark critical features for an engineering review before production.
| Process | CNC machining (suitable for turning/milling; stainless steel 303 is easy to cut, and batch turning parts are more friendly) |
|---|---|
| Material | Stainless steel 303 (commonly used in CNC machining; one of the 300 series stainless steel with priority in processing efficiency) |
| Accuracy | ±0.2 mm (common diameters; it is recommended to mark tolerances in 2D drawings for critical fits) |
| Minimum wall thickness | ≥1.0 mm (For thin-walled parts, it is recommended to evaluate the clamping deformation and processing texture; the appearance surface can be appropriately thickened for more stability) |
| Service temperature | 300–600℃ (according to the material library criteria; the actual temperature is subject to working conditions and structure) |
| Tensile strength | 450–1100 MPa (according to material library criteria; different conditions/heat treatment and standards will vary) |
| Density | 7.7–8.5 g/cm³ |
| Minimum aperture | Recommended ≥1.5–2.0 mm (drilling/reaming or EDM/secondary process evaluation is recommended for small holes; please mark the key hole positions) |
| Thread/Tapping | Supports thread processing; please indicate the thread standard and grade (such as M3/M4, 6H/6g, etc.) and whether anti-loosening/sealing requirements are required |
| Chamfers and fillets | It is recommended to add chamfers/roundings to sharp corners (reduce burrs, improve assembly and appearance consistency) |
| Appearance suggestions | Please define the appearance surface/drawing direction/polishing target and acceptable processing texture in the drawing or remarks |
| Finishing | Sand blasting, wire brushing, polishing, electrolytic polishing, passivation, laser engraving |
| Typical lead time | Related to structural complexity, quantity, inspection requirements and finishing; clear delivery and expedited options will be given after uploading the file |
Finishing
Brushed (directional texture)
Suitable for shells/panels/decorative parts; it is recommended to note the drawing direction and appearance surface definition to facilitate consistency control.
Polish (increase gloss)
Used to improve brightness and touch; complex inner cavities/deep hole locations may be affected by accessibility and need to be evaluated.
Electropolishing (cleaner surface)
Suitable for parts that are more sensitive to surface cleanliness and fine burrs; the actual effect is related to the structure and current accessibility.
Passivation (improving surface stability)
Used to enhance surface corrosion resistance stability and consistency (more suitable for humid/chemical environments); it is recommended to clarify whether it is a required option.
Laser engraving (permanent marking)
Suitable for serial numbers, logos, scales and traceability codes; it is recommended to provide vector files and location and size instructions.
Why Choose Stainless Steel 303 (CNC Machining)
Easy to cut (turning parts more efficiently)
More friendly to a large number of turning/repetitive parts, and suitable for projects that require higher processing efficiency and a more stable delivery rhythm.
Balanced strength and corrosion resistance
Suitable for structural parts, connections and long-term use parts; more stable in humid/oily environments.
Thread and assembly friendly
Suitable for threaded holes, studs/connection structures; critical fit recommendations specify tolerances and inspection criterias.
Many appearance finishing options
Supports sandblasting, wire brushing, polishing, electrolytic polishing, passivation and laser engraving to facilitate the realization of different appearance and marking requirements.
Recommended Applications
- Turned parts/batch repetitive parts: Pursuing processing efficiency and stable delivery
- Threads and connection structures: Threaded holes, connectors, fasteners and other parts
- Appearance metal parts: Shells, panels and decorative parts that require brushing/polishing and other texture treatments
- Long-term use structural parts: Metal parts used in humid/oily environments
It is not recommended to use it directly (it is recommended to change the material/brand)
- Higher corrosion resistance limit: Seaside/strongly corrosive medium environment can be evaluated first 316/316L
- Wear resistance/hardness priority: Can evaluate 420/410 and cooperate with heat treatment plan
- Cost/weight sensitive: Aluminum alloy or other lighter material systems can be evaluated
- Complex internal cavity mirror finish requirements: Need to evaluate accessibility and process route (polishing/electropolishing is affected by structure)
Design and DFM Guidelines
- Benchmark and inspection criteria: Please specify tolerances and benchmarks in 2D drawings for critical holes/critical surfaces/fitting dimensions; it is recommended to define inspection methods and sampling rules for batch parts.
- Thin walls and risk of deformation: Thin-walled long sides or large flat surfaces are more susceptible to clamping deformation and vibration; it is recommended to thicken and reinforce the appearance surface or adjust the clamping reference.
- Deep Cavity/Narrow Groove Accessibility: Deep cavity and narrow groove will limit the diameter and protrusion of the tool, which will easily lead to an increase in tool pattern and processing costs; it is recommended to relax the groove width or split the structure.
- Thread and hole machining: For small threads/deep holes, it is recommended to control the depth-to-diameter ratio; for mating holes, it is recommended to reserve a machining allowance and adopt the drilling + reaming/finishing route.
- Appearance surface and drawing direction: Drawing parts must be marked with direction and appearance; sharp edges are recommended to be chamfered to reduce burrs and improve hand feel consistency.