What aerospace buyers are really trying to prevent

In aerospace work, the expensive failures usually happen after the part is "done": it doesn’t assemble, it can’t be verified cleanly, or the documentation package doesn’t match the acceptance expectation. The fix is rarely “machine harder.” It’s alignment: drawing intent, datum strategy, process path, and inspection method all match the same functional reality.

Table of contents

• RFQ package checklist (what to send)
• AS9100 discipline (what it changes)
• Tolerances, datums, and inspection intent
• Materials and finish notes
• Supplier selection cues (engineer-first)

RFQ package checklist (quote-ready)

If you want a quote that matches acceptance intent, don’t force the shop to guess. Send:

• PDF drawing + CAD (STEP preferred), current revision identifier
• Which file controls (drawing vs model) and any conflict resolution note
• Material and condition (if known), quantity, and must-hit date
• Critical-to-function features highlighted (fits, bores, patterns, sealing faces)
• Inspection/reporting expectations (first article, dimensional report, objective evidence)
• Finish requirements and any masking/handling/packaging constraints

For printable internal assets, use: precision machining guide (PDF), buyer checklist (PDF), and CAD prep guide (PDF).

AS9100 discipline (what it changes)

AS9100 is not “a sticker.” In practical terms, it reinforces the habits that prevent aerospace rework: controlled revisions, documentation discipline, and consistent process control. If your RFQ includes traceability, reporting, or objective evidence, it helps to state those requirements early so the quote assumptions match.

See the overview at /as9100-certified-fabrication.

Tolerances, datums, and inspection intent

In aerospace work, tolerances are only valuable if they can be verified. The fastest way to reduce risk is to align datum strategy to the functional assembly reference, then focus tight tolerances only on the interfaces that control fit and performance.

• Don’t tighten everything: tighten the few interfaces that drive function.
• Call out intent: if a dimension is critical, highlight it and include any measurement expectations.
• Qualify extreme requirements: tolerances like ± .0001 should be tied to a measurable acceptance method.

Deep dive: ultimate tolerance guide.

Materials and finish notes

Material and finish requirements frequently drive feasibility and schedule. Include the exact alloy and condition if known, and identify any surfaces that are functional (sealing faces, bearing fits, sliding interfaces).

• Specify the alloy and any acceptable alternates
• Note any heat, corrosion, or environment constraints
• Call out functional surfaces and acceptable surface finish ranges

Materials reference: materials guide.

Supplier selection cues (engineer-first)

If you want to choose a supplier faster during RFQs, look for evidence of alignment—not just capability claims.

• They ask targeted questions about datums, critical interfaces, and verification.
• Quote assumptions are explicit (material, finish, inspection/reporting, acceptance intent).
• They can explain the process path in plain, technical language.
• They can show relevant examples written as measurable outcomes.

Proof pages: case studies and gallery.