# Aerospace Special Process Specification Reference (AMS, ASTM, MIL)

> Source: https://netray.co/tools/aerospace-special-process-specification-reference
> Publisher: Netray (netray.co), AI and integration engineering for ERP and manufacturing systems.
> Section: Free Tools

## Short answer

Lookup of common aerospace special processes and the AMS, ASTM, AWS and MIL specifications usually cited on drawings and purchase orders.

## Category

aerospace-defense

## Industry

Aerospace

## Audience

- Quality engineer
- Buyer
- Process engineer

## Tool

**Kind:** worksheet

**Mode:** reference

**Columns:**

#### Process

**Key:** process

**Type:** text

#### Common specification

**Key:** spec

**Type:** text

#### What it covers

**Key:** scope

**Type:** text

#### Typical approval to check

**Key:** approval

**Type:** text

**Rows:**

**Process:** Pyrometry (all heat treat)

**Spec:** AMS 2750

**Scope:** Furnace classes, instrumentation, system accuracy and temperature uniformity surveys

**Approval:** Customer or Nadcap heat treating

**Process:** Heat treatment of steel parts

**Spec:** AMS 2759

**Scope:** General requirements for heat treatment of steel parts

**Approval:** Customer or Nadcap heat treating

**Process:** Heat treatment of aluminum alloys

**Spec:** AMS 2770

**Scope:** Heat treatment of wrought aluminum alloy parts

**Approval:** Customer or Nadcap heat treating

**Process:** Heat treatment of titanium

**Spec:** AMS H 81200

**Scope:** Heat treatment of titanium and titanium alloys

**Approval:** Customer or Nadcap heat treating

**Process:** Anodize, chromic acid

**Spec:** MIL-A-8625 Type I

**Scope:** Anodic coatings for aluminum and aluminum alloys

**Approval:** Customer or Nadcap chemical processing

**Process:** Anodize, sulfuric acid

**Spec:** MIL-A-8625 Type II

**Scope:** Anodic coatings for aluminum and aluminum alloys

**Approval:** Customer or Nadcap chemical processing

**Process:** Hard anodize

**Spec:** MIL-A-8625 Type III

**Scope:** Hard anodic coatings

**Approval:** Customer or Nadcap chemical processing

**Process:** Chemical conversion coating

**Spec:** MIL-DTL-5541

**Scope:** Chemical conversion coatings on aluminum and aluminum alloys

**Approval:** Customer or Nadcap chemical processing

**Process:** Passivation of stainless steel

**Spec:** AMS 2700

**Scope:** Passivation of corrosion resistant steels

**Approval:** Customer or Nadcap chemical processing

**Process:** Passivation, alternative standard

**Spec:** ASTM A967

**Scope:** Chemical passivation treatments for stainless steel parts

**Approval:** Customer requirement

**Process:** Cadmium plating

**Spec:** AMS 2400

**Scope:** Cadmium plating

**Approval:** Customer or Nadcap chemical processing

**Process:** Nickel plating

**Spec:** AMS 2403

**Scope:** Nickel plating, general purpose

**Approval:** Customer or Nadcap chemical processing

**Process:** Chrome plating

**Spec:** AMS 2460

**Scope:** Chromium plating

**Approval:** Customer or Nadcap chemical processing

**Process:** Shot peening

**Spec:** AMS 2430

**Scope:** Shot peening, automatic

**Approval:** Customer or Nadcap nonconventional machining and surface enhancement

**Process:** Peening intensity verification

**Spec:** SAE J443

**Scope:** Almen strip procedure for peening intensity

**Approval:** Customer requirement

**Process:** Fluorescent penetrant inspection

**Spec:** AMS 2644

**Scope:** Inspection material, penetrant

**Approval:** Customer or Nadcap NDT

**Process:** Penetrant testing practice

**Spec:** ASTM E1417

**Scope:** Standard practice for liquid penetrant testing

**Approval:** Customer or Nadcap NDT

**Process:** Magnetic particle inspection

**Spec:** ASTM E1444

**Scope:** Standard practice for magnetic particle testing

**Approval:** Customer or Nadcap NDT

**Process:** Magnetic particle inspection of parts

**Spec:** AMS 2641

**Scope:** Vehicle, magnetic particle inspection

**Approval:** Customer or Nadcap NDT

**Process:** Radiographic testing

**Spec:** ASTM E1742

**Scope:** Standard practice for radiographic examination

**Approval:** Customer or Nadcap NDT

**Process:** Ultrasonic testing

**Spec:** ASTM E2375

**Scope:** Standard practice for ultrasonic testing of wrought products

**Approval:** Customer or Nadcap NDT

**Process:** Eddy current testing

**Spec:** ASTM E426

**Scope:** Electromagnetic testing of tubular products

**Approval:** Customer or Nadcap NDT

**Process:** NDT personnel qualification

**Spec:** NAS 410

**Scope:** Certification and qualification of NDT personnel

**Approval:** Customer requirement

**Process:** NDT personnel, recommended practice

**Spec:** ASNT SNT-TC-1A

**Scope:** Personnel qualification and certification in NDT

**Approval:** Employer written practice

**Process:** Fusion welding of aerospace structures

**Spec:** AWS D17.1

**Scope:** Specification for fusion welding for aerospace applications

**Approval:** Customer or Nadcap welding

**Process:** Brazing

**Spec:** AWS C3.6

**Scope:** Specification for furnace brazing

**Approval:** Customer or Nadcap welding

**Process:** Sealing of fasteners and structures

**Spec:** AMS-S-8802

**Scope:** Sealing compound, polysulfide rubber

**Approval:** Customer or Nadcap sealants

**Process:** Wet paint, primer and topcoat

**Spec:** MIL-PRF-23377

**Scope:** Primer coatings, epoxy, high solids

**Approval:** Customer requirement

**Process:** Conversion coating of titanium

**Spec:** AMS 2486

**Scope:** Conversion coating of titanium alloys

**Approval:** Customer or Nadcap chemical processing

**Process:** Electrical conductivity of aluminum

**Spec:** ASTM E1004

**Scope:** Electromagnetic eddy current conductivity measurement

**Approval:** Customer requirement

**Process:** Hardness testing, Rockwell

**Spec:** ASTM E18

**Scope:** Rockwell hardness of metallic materials

**Approval:** Lab accreditation to ISO 17025

**Process:** Mechanical testing, tension

**Spec:** ASTM E8

**Scope:** Tension testing of metallic materials

**Approval:** Lab accreditation to ISO 17025

**Notes:** Specifications and revision letters change. Always confirm the exact specification, class, type and revision on the drawing or purchase order, and check the current customer approved process source list.

## Content

**Intro:** A special process is one where the result cannot be fully verified by later inspection, so the process itself must be controlled and approved. This lookup lists the specifications that most often appear on aerospace drawings and purchase orders.

**Sections:**

#### How to use the table

**Body:** Search by process name, specification number or keyword. Each row shows the usual specification, what it covers and which approval to verify before you release a purchase order. Export the filtered rows to Excel to seed a special process approved supplier list or to check that a drawing note maps to the correct specification.

**Bullets:**

- Confirm the revision letter on the drawing, not just the number
- Check class, type and grade callouts
- Verify the supplier approval scope, not only the certificate

#### Why special processes need controls

**Body:** AS9100D clause 8.5.1.2 requires validation and control of special processes, including defined criteria, approved equipment and personnel, and monitored parameters. Customers add flowdowns that name their own approved process sources. A supplier holding Nadcap accreditation for heat treating is not automatically approved for chemical processing, so scope matters.

#### Using this in your ERP

**Body:** Most ERPs can carry the process specification on the operation or routing and the approved supplier status on the vendor record. Make sure the purchase order text includes the specification and revision, and receiving requires the process certificate. A mismatch between drawing note and PO text is a frequent audit finding.

#### Common mistakes

**Body:** Relying on a withdrawn specification, sending parts to a supplier approved for a different process scope, and missing a customer specific callout are the usual problems. The table is an index; the specification and the customer flowdown are the authority.

**Cta:** We can help turn special process rules into checks inside your ERP, such as blocking a PO to a supplier without a valid scope. Ask if that is useful.

**Faq:**

#### What counts as a special process?

**Answer:** A process whose output cannot be fully verified by subsequent inspection or test, so deficiencies appear only after use. Heat treating, plating, anodizing, welding, and many NDT methods are the usual examples.

#### Is Nadcap accreditation mandatory?

**Answer:** Not by AS9100 itself. Many primes and customers require Nadcap or their own approval for specific processes, so it depends on the purchase order and customer flowdown.

#### Which specification applies to my part?

**Answer:** The one called out on the drawing or purchase order, at the stated revision. This table shows common choices only.

#### Does this list cover everything?

**Answer:** No. It lists frequently used specifications. Customer proprietary specifications and newer processes are not included.

## Search terms

aerospace special processes list, AMS 2750 pyrometry, MIL-A-8625 anodize, AMS 2644 penetrant, AMS 2700 passivation, AWS D17.1 welding, special process specification list, AS9100 8.5.1.2 special processes

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