Plain-language guides for engineers and procurement teams sourcing custom CNC parts — written by a working CNC program manager with an ISO 9001:2015 certified production network.
Buying CNC-machined parts looks simple from the outside: send a drawing, get a price, get parts. Inside, every step has decisions that affect cost, lead time, and whether the parts you receive actually meet the requirement on the drawing. Tolerance class drives price more than geometry. Material selection drives lead time more than quantity. The format of the package you send determines whether the shop quotes the right part. These buyer's guides are written for engineers, buyers, and program managers who want to source CNC parts intelligently — whether you're getting your first custom part machined, comparing CNC against 3D printing for a build, or trying to write a tighter RFQ.
Quick Brown Fox Solutions is a SAM-registered CNC prime contractor with an ISO 9001:2015 certified production network serving aerospace, defense, medical device, and instrumentation programs. We see what works in a quote package and what causes a job to come back with questions. These guides distill that into the four questions every buyer should answer before requesting custom CNC machining — and walk through what the answers look like for real parts.
The five-step buyer process: defining the part, finding a qualified shop, requesting a quote, reviewing the quote, and approving the order. Start here if it's your first time sourcing custom CNC parts.
The complete RFQ checklist — what to send, what a complete quote should contain back, and the questions that separate a sharp RFQ from one that comes back with three pages of clarifications.
ISO 2768 grades, what plus/minus .005 inch through plus/minus .0002 inch really means in production, surface-finish callouts, and how tolerance class drives quoted price.
A decision framework for engineers choosing between subtractive and additive manufacturing for a real part — tolerance, material, volume, geometry, and regulatory acceptance.
Once you know what you need, jump into the service line: 5-axis, Swiss, milling, turning, prototype, and production.
Skip the reading and send the package. We acknowledge RFQs within one business day.
A second set of guides for buyers sourcing stock hardware rather than custom machining — aircraft owners and MRO shops, machine shops filling a bill of materials, and government-contracting specialists. They pair with our NSN catalog and part number cross-reference, where every stocked item has a published price.
How military standard hardware numbering actually works — base numbers, dash numbers, supersessions — and how each number cross-references to an NSN.
A practical playbook for owners and MRO shops: widening the search with NSN cross-references, what documentation to expect, and when to custom-machine instead.
NSNs are cataloging identities, not restrictions. What commercial buyers and machine shops need to know to order by stock number.
BAA vs TAA, designated countries, and origin documentation — what actually governs whether an item can be offered on a federal buy.
The 13-digit anatomy of an NSN — FSC, NIIN, NCB country codes — and what the number does and doesn’t tell you about a part.
Free lookup methods that actually work, the record fields that matter, and the pitfalls: superseded numbers, multi-PN records, spec-wide NSN families.
How dash numbers encode size, where material and durometer callouts live, and how o-rings and packings map to FSC 5331 stock numbers.
Reading AN dash numbers, head markings, and NAS and MS callouts — and turning a measured bolt into a part number and an NSN.
The five-character entity code on every solicitation and drawing: who assigns it, how to look one up, and CAGE vs UEI vs DUNS.
A starter guide for machine shops and small resellers: SAM registration, DIBBS, reading solicitations, and sourcing product to quote.
6,600+ MS, NAS, AN, AS, mil-spec and OEM part numbers cross-referenced to NSNs with published pricing.
8,000+ National Stock Numbers across 74 Federal Supply Classes — browse by class or search your stock number.
If you've read the guides and you're sizing up a quote, the most useful next pages are the ones that map to your actual purchase. Look at the full capabilities list if you need to confirm envelope, spindle speed, or bar capacity against your part. Look at the materials hub if material selection is still open. Look at the relevant precision machining, prototype machining, or production machining page for service-level detail. And if your part fits one of our common families, the part-type pages walk through how we routinely build it.
