EN
Custom 304 Stainless Steel UNF Threaded Fluid Connector
Direct answer: Zhengna Technology manufactures drawing-controlled 304 stainless steel threaded connectors for fluid-control assemblies. This product record covers an external UNF thread, an internal flow passage, annular groove features and a drilled side port. The outside diameter, thread and bore are produced by CNC turning, followed by side-hole drilling. Final thread size and class, groove function, tolerances, surface requirements and test acceptance must come from the buyer's controlled drawing.
Confirmed Product Scope and Drawing-Controlled Requirements
| Item | Confirmed for this product record | Required from the RFQ or drawing |
|---|---|---|
| Product | Custom metal threaded connector for a fluid-control system | Exact assembly position, mating parts and functional responsibility |
| Material | 304 stainless steel | Material standard, condition and certificate requirement |
| Confirmed nominal dimensions | 30 mm outside diameter, 40 mm length and 20 mm bore | Tolerances, datums, measurement method and acceptance criteria |
| Thread | External UNF thread at the upper end | Nominal size, pitch, class, relief, runout and gauge method |
| Flow feature | Internal bore forming a flow passage | Finished diameter, tolerance, edge condition, cleanliness and acceptance method |
| External features | Annular grooves and a drilled side port | Groove function, sealing element, port position, breakthrough and burr requirements |
| Machining | CNC turning plus side-hole drilling | Datum scheme, setup plan, secondary operations and release criteria |
| Inspection | Dimension, thread and surface-roughness checks | Measurement method, sampling, report, values and acceptance authority |
| Quotation | Controlled drawing preferred; sample-led review is possible | Revision, quantity, material, surface, test, documentation and packaging requirements |
Why This Is a Drawing-Controlled Connector
This page does not describe a standard catalog pipe fitting. The external UNF thread, internal passage, groove geometry and side port must work together with the buyer's mating design. A similar-looking component may use a different thread class, groove profile, sealing element, port angle or bore tolerance. Those differences can change machining, inspection and assembly requirements even when the outside shape looks similar.
Before quotation, the drawing should define:
- the exact UNF thread size, pitch, class and inspection method;
- the primary datums and relationships between the outside diameter, thread, bore, grooves and side port;
- whether each annular groove is a sealing groove, retaining feature or clearance feature;
- the specified O-ring or other sealing element when a groove has a sealing function;
- the bore and side-port edge condition, including burr and chip requirements;
- the required surface roughness and the exact surfaces to which it applies; and
- cleanliness, pressure, leakage or flow testing only when the purchase specification requires it.
CNC Turning and Side-Hole Drilling
The confirmed nominal geometry is a 30 mm outside diameter, 40 mm length and 20 mm bore. The route includes CNC turning of the outside diameter, external thread and internal bore. A separate drilling operation produces the visible side hole. Process planning must control the relationship between these features rather than treating each operation as independent. All tolerances, datums and acceptance criteria remain drawing-controlled.
The drawing review should identify where the thread starts and ends, how the bore is referenced, how the side hole intersects the passage, and which groove or shoulder controls assembly position. Tool access, chip evacuation, burr control and part handling are then planned around those relationships. The page does not claim a universal setup count, machine model, cycle time or tolerance.
Thread, Bore and Groove Inspection
Dimensions, threads and surface roughness are confirmed inspection categories for this product scope. The correct instrument and frequency still depend on the released specification.
- Thread: state the UNF size, class and accepted gauge or measurement method. A visual check cannot confirm thread conformity.
- Bore and outside diameter: define nominal values, tolerances, datums and whether recorded results are required.
- Grooves: identify width, diameter, position, edge condition and the sealing or assembly reference when applicable.
- Side port: define diameter, position, intersection, burr limit and any cleanliness requirement.
- Surface roughness: mark the controlled surfaces, parameter, limit, direction and measurement method.
No actual gas-tightness, pressure, flow or leakage test record was supplied for this product. Zhengna Technology therefore does not publish a pressure rating, leak value, flow capacity or sealing result on this page. If testing is required, the RFQ must define the medium, pressure or flow condition, hold time, fixture, instrument, temperature, sampling and acceptance criteria.
Drawing or Physical-Sample Quotation Path
A controlled drawing is the preferred quotation authority because it can define the UNF thread, tolerances, groove function, flow passage, material, surface condition and inspection requirements. A physical sample can support reverse-engineering review when no drawing exists, but one sample does not define allowable variation or release criteria.
For a useful quotation, send:
- the current 2D drawing and available 3D model, or a clearly identified physical sample;
- 304 stainless steel standard and material-document requirements;
- UNF thread size, pitch, class and mating context;
- critical dimensions, tolerances, datums and surface-roughness requirements;
- the purpose of each groove and the sealing element when applicable;
- fluid medium and cleanliness requirements when relevant to material or inspection review;
- any pressure, leakage or flow test specification instead of an assumed test;
- prototype quantity, production quantity and expected annual demand;
- inspection-report, traceability and documentation needs; and
- packaging, delivery and destination requirements.
Capability and Evidence Boundary
This product page is limited to one 304 stainless steel, external-UNF-threaded connector family for a fluid-control connection. It is not presented as a UQD liquid-cooling connector, complete valve, standard pipe fitting or pressure-rated finished assembly. The photograph cannot prove material grade, dimensions, tolerance, thread conformity, roughness, sealing performance or test results by appearance alone.
For the broader manufacturing route, review custom CNC machining parts. For measurement planning, use the CNC dimensional inspection and RFQ guide.
Request a Quotation Review
Send the controlled drawing or physical sample, exact UNF thread, material requirement, quantity, critical dimensions, groove and flow-path definition, inspection plan and any required test specification. Zhengna Technology will review the product against the supplied authority before confirming the manufacturing and quotation scope.
Frequently Asked Questions
Is this a standard stainless steel pipe fitting?
No. This page covers a made-to-drawing connector with an external UNF thread, internal passage, annular grooves and a drilled side port. It does not claim standard catalog compatibility.
What thread information is required?
Specify the UNF nominal size, pitch, class, thread length, relief or runout requirements, mating context and inspection method.
Are the annular grooves confirmed as sealing grooves?
Annular grooves are visible, but their exact function must come from the controlled drawing. If a groove carries an O-ring or another seal, identify the seal and acceptance requirements.
Does this product have a verified pressure or leak rating?
No verified pressure, leakage, flow or gas-tightness test record was supplied for this page. Any required test must be defined in the RFQ and confirmed for the specific project.
Can quotation begin from a physical sample?
Yes. A sample can support reverse-engineering review, but the buyer and Zhengna Technology must agree the nominal dimensions, tolerances, thread, material, flow path, inspection and release criteria before production.
