A 304 stainless steel fitting is specified where corrosion, hygiene or temperature rules out carbon steel. Below is the practical detail on 304 stainless steel fitting supplied for robotics: machining of stainless steel with controlled feeds to avoid work hardening, the tolerance that is held, the finish applied and the documents issued with the parts.
Tolerance is applied where it does work rather than across the whole drawing. Critical features are held to ±0.02 mm, non-critical dimensions follow the general machining tolerance, and the difference is stated in the quotation rather than discovered later.
Specification
| Process | Machining of stainless steel with controlled feeds to avoid work hardening |
|---|---|
| Material / configuration | 304 stainless steel |
| Size / capacity | Ø 40 mm × 150 mm |
| Tolerance | ±0.02 mm |
| Surface finish | as machined, passivated or electropolished |
| Application | fitting for robotics |
| Inspection | Dimensional report, material certificate, first article report on request |
| Lead time | 7–15 working days for samples, 3–4 weeks for production |
| Minimum order | 1 piece for prototypes, from 50 pieces for production pricing |
Manufacturing process
Work is carried out with machining of stainless steel with controlled feeds to avoid work hardening. Tooling, speeds and fixturing are recorded with the part number, so a repeat order starts from a proven process instead of a fresh setup.
Material is purchased against a certificate and checked on receipt, so the composition is known before any cutting starts. Work in progress is identified by part number and operation, and the finished parts are deburred, cleaned and protected before they leave the machine area.
Typical applications
Most of the work supplied in this category falls into the following examples.
- Food contact machine parts.
- Marine hardware and fittings.
- Chemical process components.
- Surgical and dental instruments.
- Pressure containing valve bodies.
Quality control and documentation
Critical features are measured on calibrated equipment in a controlled room, and the results are filed with the job so that a repeat order can be compared with the first.
Material certificates to EN 10204 3.1, dimensional reports and first article inspection reports are issued with the shipment where the application requires them. Calibration dates and measurement uncertainty are recorded alongside every result.
Ordering, lead time and packaging
Packaging is specified by the part: individual protection for finished surfaces, separation for assemblies, and export crating with a packing list for shipment.
Frequently asked questions
Why is stainless harder to machine than steel?
It work hardens and holds heat in the cut. Tools must stay sharp and cutting, never rubbing, otherwise the surface hardens and the next pass wears the tool quickly.
Is passivation necessary?
For corrosion performance, yes on most grades. Passivation removes free iron from the surface and restores the chromium oxide layer after machining.
Can you supply material and inspection certificates?
Yes. Material certificates to EN 10204 3.1, full dimensional reports, first article inspection reports and, where required, PPAP or AS9102 documentation are issued with the shipment.
Drawings are reviewed for manufacturability before quotation, and any feature that adds cost without adding function is pointed out at that stage rather than after the parts are made.
