The Beam,structural, cataloged under National Stock Number 9540-01-071-2149, is classified within Federal Supply Class 9540 (No Item Name Available) of the Metal Bars, Sheets, and Shapes group. The primary manufacturer of record is International Light Metals Corp Sub of Martin Marietta Corp. Government technical data includes 22 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 11 commercial cross-references from 10 manufacturers, enabling identification through both NSN and commercial part number lookups. 12 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 9540-01-071-2149 |
| Primary Part Number | 21939 |
| Item Name | Beam,structural |
| FSC / FSG | 9540 / 95 — No Item Name Available |
| Manufacturer | International Light Metals Corp Sub of Martin Marietta Corp |
| Status | ACTIVE |
| Weight Per Unit Measure | 10.479 POUNDS PER LINEAR FOOT LBS |
| Heat Treatment | O-ANNEALED |
| Material | ALUMINUM ALLOY 2024 |
| Fillet Radius Where Top Left Flange Joins Web Flange/leg | 0.125 INCHES NOMINAL IN |
| Left Side Top Flange Distance to Center of Both Flanges | 1.500 INCHES NOMINAL IN |
| Fabrication Method | EXTRUDED |
| Left Side Top Flange Thickness | 0.072 INCHES NOMINAL IN |
| Length | 10.000 FEET MINIMUM AND 12.000 FEET MAXIMUM FT |
| Right Side Top Flange Thickness | 0.072 INCHES NOMINAL IN |
| Third Tip Relationship to Preceding Tips | IDENTICAL W/FIRST TIP |
| Second Tip Relationship to First Tip | IDENTICAL |
| Material Document and Classification | AMS-QQ-A-200/3 FED SPEC SINGLE MATERIAL RESPONSE |
| Nondefinitive Spec/std Data | O TEMPER |
| Specification/standard Data | 81755-K40 MANUFACTURERS STANDARD |
| Left Top Inside Angle | 90.0 DEGREES NOMINAL |
| Basic Shape Style | T SHAPE |
| Fillet Radius Where Top Right Flange Joins Web Flange/leg | 0.125 INCHES NOMINAL IN |
| Right Top Inside Angle | 90.0 DEGREES NOMINAL |
| Top Flange Width | 3.000 INCHES NOMINAL IN |
| First Tip Style | SQUARE END |
| Right Side Top Flange Distance to Center of Both Flanges | 1.500 INCHES NOMINAL IN |
| Leg Thickness | 0.072 INCHES NOMINAL IN |
| Acquisition Status | ACTIVE |
| HAZMAT | No |
| Part Number | Manufacturer |
|---|---|
| 21939 | International Light Metals Corp Sub of Martin Marietta Corp (USA) |
| QQ-A-200/3 | Federal Specifications Promulgated by General Services Administration Washington DC (USA) |
| K40A38O | Lockheed Martin Corporation Div Lockheed Martin Aeronautics Company (USA) |
| MS14375E147 | Military Standards Promulgated by Military Departments Under Authority of Defense Standardization Manual 4120 3-M |
| 11004-A | Pimalco Inc. Div Alcoa Inc Global Hard Alloy Extrusions (USA) |
| AMS-QQ-A-200/3 | Sae International Dba Sae International (USA) |
| AMS-QQ-A-200/3 | Society of Automotive Engineers Inc (USA) |
| PA6738 | Transtar Metals Corp (USA) |
| 72160 | Aluminum Co of America (USA) |
| H2759 | Kaiser Aluminum and Chemical Corp (USA) |
| 60-4021 | Transtar Metals Corp (USA) |
NSN 9540-01-071-2149 is a Beam,structural, manufactured by International Light Metals Corp Sub of Martin Marietta Corp, classified under FSC 9540 (No Item Name Available). Status: active.
NSN 9540-01-071-2149 has 11 cross-referenced part numbers: 21939 (International Light Metals Corp Sub of Martin Marietta Corp), QQ-A-200/3 (Federal Specifications Promulgated by General Services Administration Washington DC), K40A38O (Lockheed Martin Corporation Div Lockheed Martin Aeronautics Company), MS14375E147 (Military Standards Promulgated by Military Departments Under Authority of Defense Standardization Manual 4120 3-M), 11004-A (Pimalco Inc. Div Alcoa Inc Global Hard Alloy Extrusions) and 6 more.
There are 12 known substitutes for 9540-01-071-2149: 1680-00-402-2546, 6625-00-567-5837, 9540-00-684-6322 and 9 more. Verify interchangeability with system specifications before substitution.
Key specifications for 21939: Weight Per Unit Measure: 10.479 POUNDS PER LINEAR FOOT LBS; Heat Treatment: O-ANNEALED; Material: ALUMINUM ALLOY 2024; Fillet Radius Where Top Left Flange Joins Web Flange/leg: 0.125 INCHES NOMINAL IN. 23 total characteristics are documented in the Federal Logistics Information System.