Manufacturing and inspection

How ISO 80369 gauges and reference connectors are made

A gauge carries its tolerance in two places: the turned conical form and, where one is present, the thread. This page describes the sequence that produces both, states which step fixes which part of the tolerance, and separates what is confirmed per order from what this page does not claim.

Browse Gauges Review Verification

Prepare a manufacturing inquiry

Send the Figure, material and document scope

Include the standard part, the Figure or drawing revision, the material and treatment, the critical feature, the quantity and the inspection or calibration documents you expect. Those five inputs are what let a manufacturing question be answered instead of estimated.

Before the first cut

Four inputs decide the order

Each of these changes what has to be machined and what has to be measured afterwards, so they belong in the inquiry rather than in the purchase order.

Standard part and Figure

Which part of ISO 80369, and which Figure or drawing the item is made against. The Figure is what fixes the limits, not the photograph.

Material and treatment

The material and any heat treatment must be stated before grinding, because the final size is set after treatment rather than before it.

Feature and tolerance

The conical form, the thread, a specific diameter or another named feature. Which feature is critical decides which inspection step has to follow.

Documents and packing

The inspection record, calibration statement, traceability information and protective packaging that should accompany the item.

Manufacturing process illustration

What the process steps look like before the part reaches inspection

Three illustrations place the manufacturing steps in order: turning produces the conical form and its surface, grinding sets the thread flank and the final size after heat treatment, and the finished item then passes dimensional and thread inspection before packing. The sequence matters because each step fixes a different part of the tolerance, and a dimension that is lost at grinding cannot be recovered at inspection.

CNC turning process for precision ISO 80369 Luer gauge and reference connector components — Illustrative turning of a gauge blank, where the conical form and its surface finish are produced. The machine and control screen are generic and no machine model is depicted.
Luer gauges produced to these tolerances

Precision thread grinding process for ISO 80369 Luer gauge and connector inspection components — Illustrative thread grinding after heat treatment, where the thread flank and the final size are set. The wheel and machine shown are generic.
How the finished feature is verified

Illustrated ISO 80369 Luer gauge manufacturing, grinding, dimensional inspection and quality control workflow — Illustrative full workflow from machining through inspection to packing. Labels and values embedded in the graphic are schematic and are not specifications.
See how verification is organized

Where the tolerance is set

Three steps, three different consequences

A dimension lost at grinding cannot be recovered at inspection. The sequence below is why the inspection plan follows the process plan rather than replacing it.

Turning

Produces the conical form, the primary diameters and the surface finish. The cone angle comes from this step, and re-cutting it later risks the seating geometry.

Grinding after heat treatment

Sets the thread flank and the final size once the part has been hardened. Grinding allowance has to be planned before treatment, not after it.

Inspection and packing

The finished feature is measured against the drawing or Figure, the result is recorded against the item, and the part is packed with its documents.

Scope of this page

What is stated here, and what is not

A manufacturing page is only useful if a buyer can tell which sentences are commitments and which are not. The two lists below are the boundary.

Stated on this page

The process sequence and which step determines which part of the tolerance.
That dimensions are set after heat treatment rather than before it.
That inspection follows the selected feature and the record the buyer needs.
That documents and packaging are confirmed per order scope.

Deliberately not stated

Machine brands, machine models or control systems.
Plant capacity, cycle times, output volumes or staffing.
That any illustration on this page is a photograph of a KingPo workshop.
That a shown process is the only route used for every item.

Confirmed per order

Material, heat treatment, grinding allowance, inspection method, inspection record, calibration wording, packaging and delivery are all confirmed against the exact item and quantity, not inherited from a general statement on this page.

Calibration and documents

Continue

Follow the item into verification or into selection

Manufacturing questions usually turn into either a verification question or a selection question. Both are covered on the pages below.