A 420 stainless steel coupling is specified where corrosion, hygiene or temperature rules out carbon steel. This page covers 420 stainless steel coupling produced for electronics: machining of stainless steel with controlled feeds to avoid work hardening. Every unit is supplied to drawing rather than to a catalogue description, and 150 × 100 × 50 mm envelope is the starting point rather than the limit.
In practice the difficulty is rarely the nominal size. ±0.02 mm is held on the features that locate the part in the assembly, and the process is set up so that the first piece and the five hundredth measure the same way.
Specification
| Process | Machining of stainless steel with controlled feeds to avoid work hardening |
|---|---|
| Material / configuration | 420 stainless steel |
| Size / capacity | 150 × 100 × 50 mm envelope |
| Tolerance | ±0.02 mm |
| Surface finish | as machined, passivated or electropolished |
| Application | coupling for electronics |
| 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
Production begins with a drawing and material review. Stock is certified, the operation sequence is fixed, and machining of stainless steel with controlled feeds to avoid work hardening is carried out on equipment maintained to hold ±0.02 mm over a full shift, not just on a first piece.
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
Inspection is not a final formality. Dimensions are checked during the cycle and again at the end, so drift is corrected while there is still stock to remove.
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
Orders start from a single piece. Samples are quoted from the 3D model, and production pricing follows once quantity, finishing and inspection are agreed.
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.
How long does delivery take?
Sample parts are typically shipped in 7 to 15 working days after drawing approval. Production batches run 3 to 4 weeks depending on quantity, finishing and inspection requirements.
Send the drawing or the 3D model for a quotation. Include material, quantity, tolerance and finish, and a detailed quote with lead time is returned within one working day.
