{"id":1200,"date":"2026-10-06T03:26:00","date_gmt":"2026-10-06T03:26:00","guid":{"rendered":"https:\/\/www.fenxifiber.com\/zirconia-ferrule-concentricity\/"},"modified":"2026-10-04T00:54:36","modified_gmt":"2026-10-04T00:54:36","slug":"zirconia-ferrule-concentricity","status":"publish","type":"post","link":"https:\/\/www.fenxifiber.com\/fr\/zirconia-ferrule-concentricity\/","title":{"rendered":"Concentricit\u00e9 des viroles en zircone : ce que mesure la norme CEI 61300-3-25"},"content":{"rendered":"

IEC 61300-3-25 gives a defined way to measure concentricity for non-angled ferrules, but that result answers only one part of connector quality. Bore geometry affects fibre position, the installed fibre adds its own offset, polishing controls the contact surface, and assembly conditions affect the finished connection. A ferrule report therefore cannot replace optical and end-face tests on the completed connector.<\/strong><\/p>\n

Buyers often request one concentricity number and assume it predicts connector loss. That shortcut ignores whether the report covers the bare bore or an installed fibre, and it overlooks fibre diameter tolerance, adhesive distribution, ferrule outside geometry, angular bore error, spring force, polishing and the reference connector used during optical test. A better specification identifies the measurement state, controls the ferrule as a component and verifies the terminated assembly as a separate product.<\/p>\n

Scope boundary:<\/strong> IEC 61300-3-25 applies to non-angled ferrules. An APC assembly adds angle, key-orientation and end-face-geometry controls, so a buyer should not present a non-angled concentricity report as complete APC approval evidence.<\/p>\n

\"Zirconia<\/figure>\n

Which Ferrule Dimensions Matter to Assembly Quality?<\/h2>\n

Each dimension has a different function. Ask the supplier to identify the measurement method and sampling rule rather than submitting an unlabeled inspection screenshot.<\/p>\n\n\n\n\n\n\n\n\n\n
Caract\u00e9ristique<\/th>\nPourquoi est-ce important ?<\/th>\nCommon misunderstanding<\/th>\nRequired evidence<\/th>\n<\/tr>\n<\/thead>\n
Bore diameter and form<\/td>\nControls fibre fit and adhesive space through the ferrule<\/td>\nOne diameter value describes the full bore<\/td>\nMeasurement locations, method and lot summary<\/td>\n<\/tr>\n
Bore-to-outer-diameter concentricity<\/td>\nInfluences where the fibre sits relative to the ferrule axis<\/td>\nA good component value guarantees low connector loss<\/td>\nComponent report plus completed-assembly optical result<\/td>\n<\/tr>\n
Ferrule outer geometry<\/td>\nWorks with the adapter sleeve to align the mating pair<\/td>\nOnly the bore affects alignment<\/td>\nDimensional drawing and gauge traceability<\/td>\n<\/tr>\n
End-face geometry after polish<\/td>\nControls physical contact and stress at the fibre interface<\/td>\nThe ferrule supplier owns the final end face<\/td>\nFinished-connector geometry and visual records<\/td>\n<\/tr>\n
Material and surface condition<\/td>\nAffects wear, polishing behaviour and defect risk<\/td>\nAll white ceramic ferrules are interchangeable<\/td>\nMaterial declaration, approved source and change notice<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

How Should Ferrule Data Be Used During Supplier Approval?<\/h2>\n

Use ferrule measurements to control the incoming component and finished optical data to release the connector. Keeping those decisions separate makes a failure easier to locate.<\/p>\n

Approve the measurement definition<\/h3>\n

A tolerance without a method invites incomparable data. Record the gauge type, calibration route, measurement positions and whether reported values are individual readings, averages or process summaries.<\/p>\n

Link lots across the process<\/h3>\n

The connector record should link ferrule lot, fibre lot, adhesive batch, polishing batch and final test. When loss shifts, that trace lets engineering test a cause instead of blaming every ceramic component in stock.<\/p>\n

Inspect after polishing and cleaning<\/h3>\n

A dimensionally acceptable ferrule can still carry debris, scratches, pits or a damaged fibre. End-face inspection belongs after the final cleaning stage, and the record should identify the connector rather than only the production line.<\/p>\n

Use reference artefacts consistently<\/h3>\n

Optical results move when the reference connector, adapter or cleaning condition changes. State how reference items are qualified, stored and replaced so supplier and buyer measurements remain comparable.<\/p>\n

\"LC<\/figure>\n

Failure Analysis: Component Defect or Assembly Defect?<\/h2>\n

Use evidence from both levels before issuing a supplier corrective action. The table keeps the investigation from stopping at the first plausible cause.<\/p>\n\n\n\n\n\n\n\n\n\n
Sympt\u00f4me<\/th>\nComponent checks<\/th>\nAssembly checks<\/th>\nDisposition<\/th>\n<\/tr>\n<\/thead>\n
High or unstable loss<\/td>\nBore and outer-geometry data by ferrule lot<\/td>\nFibre position, polish, contamination and reference setup<\/td>\nQuarantine the linked lots and repeat with controlled references<\/td>\n<\/tr>\n
Visible core offset<\/td>\nConcentricity and bore-form trace<\/td>\nAdhesive cure and fibre seating process<\/td>\nCross-section samples before assigning root cause<\/td>\n<\/tr>\n
Scratches or pits<\/td>\nIncoming ferrule surface condition<\/td>\nPolishing film, cleaning and handling<\/td>\nSeparate incoming damage from process damage<\/td>\n<\/tr>\n
Good initial result, poor remate<\/td>\nOuter geometry and material consistency<\/td>\nAdapter sleeve, spring force and end-face cleanliness<\/td>\nRun controlled remating and inspect between stages<\/td>\n<\/tr>\n
Lot-to-lot shift<\/td>\nSupplier material and tooling change<\/td>\nFixture, operator and reference-cord change<\/td>\nReview both change logs against the first failing lot<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
\"SC<\/figure>\n

Normes et justificatifs \u00e0 joindre au bon de commande<\/h2>\n

IEC 61300-3-25:2016<\/a> defines procedures for bore-to-ferrule-axis concentricity on bare non-angled ferrules and fibre-core-to-ferrule-axis concentricity after fibre installation. The IEC catalogue lists the third edition as valid with a stability date of 2034.<\/p>\n

Bore concentricity and bore angle are separate characteristics. IEC 61300-3-54:2019<\/a> addresses angular misalignment between a cylindrical ferrule bore axis and the outside-diameter datum axis.<\/p>\n

L'\u00e9dition 2022 traite des d\u00e9bris, rayures et d\u00e9fauts pr\u00e9sents sur les faces d'extr\u00e9mit\u00e9 et pr\u00e9cise que l'inspection visuelle ne remplace pas la qualification optique. Voir Contr\u00f4le des connecteurs selon la norme CEI 61300-3-35<\/a>.<\/p>\n

Corning pr\u00e9cise que la norme GR-326 est une sp\u00e9cification de performance applicable aux assemblages complets de connecteurs et de c\u00e2bles de raccordement monomodes, et non une sp\u00e9cification relative \u00e0 un composant isol\u00e9. Voir Note d'application de Corning sur le GR-326<\/a>.<\/p>\n

Laboratory Acceptance Note<\/h2>\n

A ferrule purchase should include dimensional evidence, lot traceability and change control. A connector purchase should additionally include end-face and optical evidence from the completed assembly. Keeping both records provides a defensible path from raw component to link performance.<\/p>\n