Fitment Evidence Standard

How We Verify Fitment

A dimensional match is only a starting point. A fitment claim requires evidence for the exact bearing, handpiece or assembly version, and bearing position.

Three Evidence Tiers

Every product-to-handpiece relationship in our records carries exactly one evidence tier. The tier controls what we are allowed to say publicly.

Tier A — Primary

Direct Evidence

OEM documentation, factory drawings, or a physical teardown and measurement of the actual handpiece or turbine.

  • OEM service manuals and parts lists
  • Manufacturer engineering drawings
  • Our own micrometer measurements of purchased assemblies
Tier B — Supporting

Production Records

Our own factory master data: historical production orders, outgoing inspection sheets and packaging labels for bearings produced for a named application.

  • Internal model-mapping tables
  • Outgoing quality inspection records
  • Long-term OEM supply history
Tier C — Leads Only

Unverified Market Data

Marketplace listings, competitor compatibility charts and forum posts. Useful as research leads — never sufficient to publish a fitment claim.

  • Marketplace size listings
  • Third-party cross-reference charts
  • Never shown as confirmed fitment

The Publication Gate

Before a model-level fitment claim may appear on this site, it must pass one of these two gates:

Gate 1 — Direct: at least one Tier A source. An OEM document naming the bearing, or our own physical measurement of the assembly.
Gate 2 — Corroborated + Physical: two independent Tier B records agreeing on the same relationship, plus a physical teardown measurement of a purchased sample unit.
No exceptions: if a relationship has not passed a gate, the product page shows dimensions and construction only — with fitment status explicitly marked as under review.

How to Read Our Fitment Labels

These labels distinguish the evidence supporting a specific application statement. A general description of a label is not a verified fitment record:

●

Physically verified — we purchased the OEM assembly, disassembled it and measured the bearing. The claim rests on our own measurement report.
◆

OEM documentation — the relationship is named in a manufacturer document we hold on file, with document number and revision recorded.
◎

Production record — supporting manufacturing or inspection evidence. Production records alone do not confirm fitment. Under Gate 2, the relationship must also have physical verification and pass technical review before it is published as a fitment claim.
○

Under review — a lead exists but has not passed a gate. No fitment claim is made; dimensions are published for identification only.

What We Do Not Do

We do not copy competitor charts

Compatibility tables on other websites are Tier C leads. Copying them would multiply their errors. Every claim here traces to a source we can show.

We do not claim from dimensions alone

A 3.175 × 6.35 × 2.78 mm bearing is not automatically the correct turbine bearing. Position, shoulder, flange and cage design decide fit — dimensions only narrow candidates.

We do not hide uncertainty

An application that has not passed the evidence gate remains unconfirmed. A measurement or a matching dimension alone does not establish interchangeability.

We do not imply OEM affiliation

Brand names appear solely to identify compatible applications. All trademarks belong to their owners; no authorization is implied unless expressly stated.

Physical Verification Records

A physical verification record should identify the examined assembly, model or version, bearing position, measurement method, date and supporting images. Its conclusions apply to the documented sample and conditions; they do not automatically cover every handpiece with a similar name.

If the exact model or version is not supported by a reviewed application record, request a technical review before treating a dimensional candidate as a verified replacement.

Unsure About a Model?

Send the handpiece model, assembly version, any visible bearing markings and photos. Our technical team reviews every submission against the same evidence standard.

Submit for Technical Review
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