Materials & coatings lookup
Legacy drawings cite specs that no longer exist under that name — a print calling for QQ-A-250/4 is asking for what is now AMS-QQ-A-250/4 (2024 aluminum sheet and plate), and certifying material against the wrong revision is a routine FAIR finding. This page looks up common aerospace material callouts — aluminum, steel, and titanium AMS/ASTM specs — alongside coating and plating specs, and resolves superseded designations to their current equivalents.
Use it when a drawing note names a spec you don’t recognize, or when your mill cert cites a different-but-equivalent designation than the print.
QQ-A-250/11 → AMS-QQ-A-250/11
| Common name | Alloy | Group | Hardness range | Specifications |
|---|---|---|---|---|
| Aluminum 2024 | 2024 | Aluminum | 120–150 HB (temper-dependent) | AMS 4037 (Sheet (T3) / Plate (T351)); AMS 4035 (Sheet/Plate (O, annealed)); AMS 4120 (Bar/Rod/Wire (T4/T351)); AMS 4192 (Sheet/Plate (T361)); AMS-QQ-A-250/4 (Sheet/Plate) |
| Aluminum 6061 | 6061 | Aluminum | 90–105 HB | AMS 4027 (Sheet (T6) / Plate (T651)); AMS 4117 (Bar/Rod (T6/T651)); AMS 4150 (Extrusion/Rings (T6)); AMS-QQ-A-250/11 (Sheet/Plate) |
| Aluminum 7050 | 7050 | Aluminum | 135–160 HB | AMS 4050 (Plate (T7451)); AMS 4108 (Hand Forging (T7452)); AMS 4342 (Extrusion (T74511)) |
| Aluminum 7075 | 7075 | Aluminum | 135–160 HB | AMS 4078 (Plate (T7351)); AMS 4045 (Sheet (T6) / Plate (T651)); AMS 4154 (Extrusion (T6/T6510/T6511)); AMS 4124 (Bar/Rod/Wire (T7351, cold-finished)); AMS-QQ-A-250/12 (Sheet/Plate) |
| Aluminum 7175 (UNS A97175) | 7175 | Aluminum | — | AMS 4149 (Die & Hand Forging (T74, formerly T736)); AMS 4148 (Die Forging (T66)); AMS 4179 (Forging (T7452, stress relieved)); AMS 4344 (Extrusion (T73511)) |
| AISI 4130 Chrome-Moly Steel | 4130 | Steel | 28–34 HRC (Q&T) | AMS 6350 (Sheet/Strip/Plate (annealed)); AMS 6351 (Sheet/Strip/Plate (spheroidized annealed)); AMS 6345 (Sheet/Strip/Plate (normalized)); AMS 6370 (Bar/Forging/Ring (annealed)); AMS 6371 (Seamless Mechanical Tubing (normalized or stress-relieved)); AMS 6348 (Bar (normalized)) |
| AISI 4340 Nickel-Chrome-Moly Steel | 4340 | Steel | 38–44 HRC (Q&T) | AMS 6414 (Bar/Forging (VAR)); AMS 6359 (Sheet/Strip/Plate (air melt)); AMS 6415 (Bar (AQ)); AMS 6454 (Sheet/Strip/Plate (VAR)) |
| 300M Ultra-High-Strength Steel | 300M | Steel | 52–56 HRC | AMS 6417 (Bar/Forging); AMS 6419 (Bar (consumable electrode melted)) |
| 15-5PH Precipitation Hardening Stainless | 15-5PH | Steel | 28–47 HRC | AMS 5659 (Bar/Forging/Ring); AMS 5862 (Sheet/Strip/Plate) |
| 17-4PH Precipitation Hardening Stainless | 17-4PH | Steel | 28–47 HRC | AMS 5643 (Bar/Forging/Ring); AMS 5604 (Sheet/Strip/Plate) |
| 303 Free-Machining Stainless Steel | 303 | Stainless Steel | 150–212 HB | AMS 5640 (Bar); ASTM A582 (Bar) |
| 304 Austenitic Stainless Steel | 304 | Stainless Steel | 123–201 HB | AMS 5639 (Bar); AMS 5513 (Sheet/Strip/Plate); ASTM A240 (Plate/Sheet/Strip) |
| 316 Austenitic Stainless Steel | 316 | Stainless Steel | 130–217 HB | AMS 5524 (Sheet/Strip/Plate); AMS 5648 (Bar/Wire); ASTM A240 (Plate/Sheet/Strip) |
| Ti-6Al-4V Grade 5 | Ti-6Al-4V | Titanium | 30–39 HRC | AMS 4911 (Sheet/Strip/Plate); AMS 4928 (Bar/Wire/Forging); AMS 4967 (Bar/Wire/Forging (annealed, heat treatable)); AMS 4935 (Extrusion/Flash-Welded Ring (annealed, beta processed)) |
| Ti-6Al-4V ELI Grade 23 (Extra Low Interstitial) | Ti-6Al-4V ELI | Titanium | 28–37 HRC | AMS 4930 (Bar/Wire); AMS 4931 (Bar/Forging/Ring (duplex annealed)) |
| Commercially Pure Titanium Grade 2 | CP Ti Grade 2 | Titanium | 145–200 HB | AMS 4902 (Sheet/Strip/Plate); AMS 4941 (Welded Tubing (annealed)) |
| Inconel 625 (UNS N06625) | Inconel 625 | Nickel | 145–240 HB | AMS 5666 (Bar/Forging); AMS 5599 (Sheet/Plate); ASTM B446 (Bar/Rod) |
| Inconel 718 (UNS N07718) | Inconel 718 | Nickel | 34–44 HRC (aged) | AMS 5662 (Bar/Forging (solution treated 1775 deg F, precipitation-hardenable)); AMS 5663 (Bar/Forging (solution treated + aged)); AMS 5596 (Sheet/Strip/Plate); AMS 5664 (Bar/Forging (solution treated 1950 deg F, precipitation-hardenable)) |
| Waspaloy (UNS N07001) | Waspaloy | Nickel | 31–43 HRC | AMS 5707 (Bar/Forging); AMS 5544 (Sheet/Strip/Plate) |
Coatings
| Spec | Type | Common name | Thickness |
|---|---|---|---|
| MIL-A-8625 | Type I · Class 1 | Chromic Acid Anodize | 0.5–7.6 µm |
| MIL-A-8625 | Type I · Class 2 | Chromic Acid Anodize (Dyed) | 0.5–7.6 µm |
| MIL-A-8625 | Type IB · Class 1 | Low-Voltage Chromic Acid Anodize | 0.5–7.6 µm |
| MIL-A-8625 | Type IB · Class 2 | Low-Voltage Chromic Acid Anodize (Dyed) | 0.5–7.6 µm |
| MIL-A-8625 | Type IC · Class 1 | Non-Chromic Acid Anodize | 0.5–7.6 µm |
| MIL-A-8625 | Type IC · Class 2 | Non-Chromic Acid Anodize (Dyed) | 0.5–7.6 µm |
| MIL-A-8625 | Type II · Class 1 | Sulfuric Acid Anodize | 2.5–25 µm |
| MIL-A-8625 | Type II · Class 2 | Sulfuric Acid Anodize (Dyed) | 2.5–25 µm |
| MIL-A-8625 | Type IIB · Class 1 | Thin Sulfuric Acid Anodize | 0.5–7.6 µm |
| MIL-A-8625 | Type IIB · Class 2 | Thin Sulfuric Acid Anodize (Dyed) | 0.5–7.6 µm |
| MIL-A-8625 | Type III · Class 1 | Hard Anodize (Hardcoat) | 25–100 µm |
| MIL-A-8625 | Type III · Class 2 | Hard Anodize (Hardcoat, Dyed) | 25–100 µm |
| MIL-DTL-5541 | Type I · Class 1A | Hexavalent Chromate Conversion (Corrosion Protection) | — |
| MIL-DTL-5541 | Type I · Class 3 | Hexavalent Chromate Conversion (Low Resistance) | — |
| MIL-DTL-5541 | Type II · Class 1A | Trivalent Chromate Conversion (Corrosion Protection) | — |
| MIL-DTL-5541 | Type II · Class 3 | Trivalent Chromate Conversion (Low Resistance) | — |
| QQ-P-416 | Type I · Class 1 | Cadmium Plate (As Plated, 0.0005 in min) | ≥ 12.7 µm |
| QQ-P-416 | Type I · Class 2 | Cadmium Plate (As Plated, 0.0003 in min) | ≥ 7.6 µm |
| QQ-P-416 | Type I · Class 3 | Cadmium Plate (As Plated, 0.0002 in min) | ≥ 5.1 µm |
| QQ-P-416 | Type II · Class 1 | Cadmium Plate + Chromate (0.0005 in min) | ≥ 12.7 µm |
| QQ-P-416 | Type II · Class 2 | Cadmium Plate + Chromate (0.0003 in min) | ≥ 7.6 µm |
| QQ-P-416 | Type II · Class 3 | Cadmium Plate + Chromate (0.0002 in min) | ≥ 5.1 µm |
| QQ-P-416 | Type III · Class 1 | Cadmium Plate + Phosphate (0.0005 in min) | ≥ 12.7 µm |
| QQ-P-416 | Type III · Class 2 | Cadmium Plate + Phosphate (0.0003 in min) | ≥ 7.6 µm |
| QQ-P-416 | Type III · Class 3 | Cadmium Plate + Phosphate (0.0002 in min) | ≥ 5.1 µm |
| AMS 2700 | Method 1, Type 1 | Nitric Passivation, Method 1 Type 1 (Low Temp + Dichromate) | — |
| AMS 2700 | Method 1, Type 2 | Nitric Passivation, Method 1 Type 2 (Medium Temp + Dichromate) | — |
| AMS 2700 | Method 1, Type 3 | Nitric Passivation, Method 1 Type 3 (High Temp + Dichromate) | — |
| AMS 2700 | Method 1, Type 4 | Nitric Passivation, Method 1 Type 4 (Free-Machining Grades) | — |
| AMS 2700 | Method 1, Type 5 | Anodic Passivation, Method 1 Type 5 (High-Carbon Martensitic) | — |
| AMS 2700 | Method 1, Type 6 | Nitric Passivation, Method 1 Type 6 (Low Temp) | — |
| AMS 2700 | Method 1, Type 7 | Nitric Passivation, Method 1 Type 7 (Medium Temp) | — |
| AMS 2700 | Method 1, Type 8 | Nitric Passivation, Method 1 Type 8 (Medium Temp, High Concentration) | — |
| AMS 2700 | Method 2 (Citric) | Citric Acid Passivation, Method 2 | — |
| AMS 2404 | Electroless Nickel · Class 1 | Electroless Nickel, As-Plated (AMS 2404 Class 1) | — |
| AMS 2404 | Electroless Nickel · Class 2 | Electroless Nickel, Heat-Treated for Hardness (AMS 2404 Class 2) | — |
| AMS 2404 | Electroless Nickel · Class 3 | Electroless Nickel, Adhesion Bake for Non-Heat-Treatable Al/Be (AMS 2404 Class 3) | — |
| AMS 2404 | Electroless Nickel · Class 4 | Electroless Nickel, Adhesion Bake for Heat-Treatable Al (AMS 2404 Class 4) | — |
| AMS 2405 | Electroless Nickel | Electroless Nickel, Low Phosphorus (AMS 2405) | — |
| QQ-C-320 | Chromium · Class 1 | Decorative Chromium (QQ-C-320 Class 1) | — |
| QQ-C-320 | Hard Chrome · Class 2 | Engineering (Hard) Chromium (QQ-C-320 Class 2) | ≥ 50.8 µm |
| QQ-C-320 | Hard Chrome · Class 2a | Hard Chromium 2a (Per Procuring Activity) | — |
| QQ-C-320 | Hard Chrome · Class 2b | Hard Chromium 2b (Below HRC 40, Static/Limited Life) | — |
| QQ-C-320 | Hard Chrome · Class 2c | Hard Chromium 2c (Below HRC 40, Dynamic/Unlimited Life) | — |
| QQ-C-320 | Hard Chrome · Class 2d | Hard Chromium 2d (HRC 40+, Static/Limited Life) | — |
| QQ-C-320 | Hard Chrome · Class 2e | Hard Chromium 2e (HRC 40+, Dynamic/Unlimited Life) | — |
Why do drawings cite superseded specs?
Aerospace part definitions outlive their standards. Federal and military specifications (QQ-, MIL-) were progressively cancelled or handed to SAE as AMS documents, but drawings are rarely revised just to refresh a material note — the old callout stays legally on the print for decades. The FAIR still has to certify conformance, so the practical question is always “what is the active successor spec, and does my cert satisfy it?” That mapping is what the resolver answers; the buying decision (accept successor vs. demand the exact cited spec) belongs to your customer’s flow-down.