# Custom Parts Manufacturing for Oil & Gas

> Pressure-rated components machined to API expectations, with the certs to prove it.

- HTML page: https://fabvector.com/industries/oil-and-gas (Portuguese: https://fabvector.com/pt/industries/oil-and-gas)

## Sourcing pain points we solve

Oil and gas parts work where failure is measured in blowouts, not warranty claims: valve internals and downhole tools see pressure, vibration and H2S-laden sour service simultaneously. NACE MR0175 turns material selection into a compliance question — hardness limits and alloy restrictions that rule out the obvious cheap choice. Every pressure-bearing part needs an EN 10204 3.1 certificate tracing it to a tested heat lot, and a missing cert can quarantine an entire shipment at the wellsite. Procurement swings between urgent rig-down replacements and planned project packages, and suppliers must serve both without compromising documentation.

## Typical parts

- Valve bodies, stems and trim components
- Downhole tool housings and subs
- Flanged connections and hub adapters
- Sensor pressure housings and instrument ports
- PEEK seals, seats and back-up rings

## Recommended materials

- [alloy-steel-4140](https://fabvector.com/md/materials/alloy-steel-4140)
- [stainless-steel-316l](https://fabvector.com/md/materials/stainless-steel-316l)
- [stainless-steel-17-4ph](https://fabvector.com/md/materials/stainless-steel-17-4ph)
- [peek](https://fabvector.com/md/materials/peek)

## Recommended finishes

- [ptfe-coating](https://fabvector.com/md/finishes/ptfe-coating)
- [electroless-nickel-plating](https://fabvector.com/md/finishes/electroless-nickel-plating)
- [passivation](https://fabvector.com/md/finishes/passivation)

## Certifications & standards

- **API Q1**: We understand API Q1 supply chains and the process documentation discipline oilfield equipment manufacturers flow down to machining suppliers.
- **API 6A**: We understand API 6A requirements for wellhead and christmas-tree components, including material class and PSL documentation expectations.
- **NACE MR0175**: We understand NACE MR0175 sour-service constraints — hardness limits and alloy restrictions are applied at material selection, not discovered at inspection.
- **EN 10204 3.1**: We support EN 10204 3.1 certificates on every pressure-bearing part, tracing it to a tested mill heat lot.

_We understand and support these requirements; certification and documentation scope is confirmed per order — we do not claim to hold certifications on this page._

## Buyer questions, answered

### What does NACE MR0175 mean for machined valve and wellhead parts?

It restricts material condition in H2S service: hardness caps (e.g. 22 HRC for many carbon and low-alloy steels), controlled heat-treat states, and documented compliance per heat. Practically, you specify the alloy and condition, we buy to it and hand you the 3.1 cert plus hardness results — substitution is not a favour anyone should do you.

### Can 4140 downhole tool bodies be machined and coated to spec offshore of the US?

Yes — 4140 QT bodies, mandrels and subs with PTFE or electroless nickel coating are standard work, threads cut and gauged to your programme's spec including API forms where the drawing calls them. The gauge certificate travels with the parts.

### How is pressure-part traceability handled from bar stock to shipment?

Every pressure-path part ties to a heat number: the 3.1 certificate is matched at material receipt, the job traveller carries the heat through machining, and the shipment paperwork closes the chain. Ask for the trace package at RFQ and it costs little; reconstruct it later and it costs the batch.