The Beam,structural, cataloged under National Stock Number 9540-00-251-2681, 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 Lockheed Martin Corp. Government technical data includes 21 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 7 commercial cross-references from 7 manufacturers, enabling identification through both NSN and commercial part number lookups. 10 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Cancelled.
| Parameter | Value |
|---|---|
| NSN | 9540-00-251-2681 |
| Primary Part Number | LS497-2 |
| Item Name | Beam,structural |
| FSC / FSG | 9540 / 95 — No Item Name Available |
| Manufacturer | Lockheed Martin Corp |
| Status | CANCELLED |
| Heat Treatment | T-3511 SOLUTION HEAT TREATED |
| Weight Per Unit Measure | 0.570 POUNDS PER LINEAR FOOT LBS |
| Left Side Top Flange Thickness | 0.125 INCHES NOMINAL IN |
| First Tip Style | SQUARE END |
| Material | ALUMINUM ALLOY 2024 |
| Third Tip Relationship to Preceding Tips | IDENTICAL W/FIRST TIP |
| Fabrication Method | EXTRUDED |
| Fillet Radius Where Top Left Flange Joins Web Flange/leg | 0.125 INCHES NOMINAL IN |
| Right 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 |
| Left Side Top Flange Distance to Center of Both Flanges | 1.187 INCHES NOMINAL IN |
| Right Side Top Flange Distance to Center of Both Flanges | 1.188 INCHES NOMINAL IN |
| Nondefinitive Spec/std Data | 2024 ALLOY AND T3511 TEMPER |
| Material Document and Classification | AMS-QQ-A-200/3 FED SPEC SINGLE MATERIAL RESPONSE |
| Top Flange Width | 2.375 INCHES NOMINAL IN |
| Right Side Top Flange Thickness | 0.125 INCHES NOMINAL IN |
| Leg Thickness | 0.125 INCHES NOMINAL IN |
| Second Tip Relationship to First Tip | IDENTICAL |
| Left Top Inside Angle | 90.0 DEGREES NOMINAL |
| Length | 10.000 FEET MINIMUM AND 12.000 FEET MAXIMUM FT |
| Acquisition Status | CANCELLED |
| HAZMAT | No |
| Part Number | Manufacturer |
|---|---|
| QQ-A-200/3 | Federal Specifications Promulgated by General Services Administration Washington DC (USA) |
| 9540PL1768281 | Jednolity Indeks Materialowy - Uniform Material Index (POL) |
| LS497-2 PRIMARY | Lockheed Martin Corp (USA) |
| 31345 | Aluminum Co of America (USA) |
| 15084 | International Light Metals Corp Sub of Martin Marietta Corp (USA) |
| AMS-QQ-A-200/3 | Society of Automotive Engineers Inc (USA) |
| AMS-QQ-A-200/3 | Sae International Dba Sae International (USA) |
NSN 9540-00-251-2681 is a Beam,structural, manufactured by Lockheed Martin Corp, classified under FSC 9540 (No Item Name Available). Status: cancelled.
NSN 9540-00-251-2681 has 7 cross-referenced part numbers: QQ-A-200/3 (Federal Specifications Promulgated by General Services Administration Washington DC), 9540PL1768281 (Jednolity Indeks Materialowy - Uniform Material Index), LS497-2 (Lockheed Martin Corp), 31345 (Aluminum Co of America), 15084 (International Light Metals Corp Sub of Martin Marietta Corp) and 2 more.
There are 10 known substitutes for 9540-00-251-2681: 9540-00-006-8448, 3110-00-155-6675, 7510-00-223-6707 and 7 more. Verify interchangeability with system specifications before substitution.
Key specifications for LS497-2: Heat Treatment: T-3511 SOLUTION HEAT TREATED; Weight Per Unit Measure: 0.570 POUNDS PER LINEAR FOOT LBS; Overall Height: 1.500 INCHES NOMINAL IN; Left Side Top Flange Thickness: 0.125 INCHES NOMINAL IN. 22 total characteristics are documented in the Federal Logistics Information System.
NSN 9540-00-251-2681 is currently cancelled. Check with the Defense Logistics Agency for current availability and authorized substitutes.