The Beam,structural, cataloged under National Stock Number 9540-01-166-2657, is classified within Federal Supply Class 9540 (Structural Shapes, Nonferrous Base Metal) of the Metal Bars, Sheets, and Shapes group. Government technical data includes 20 specifications, cited from the U.S. Government catalog. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 9540-01-166-2657 |
| Item Name | Beam,structural |
| FSC / FSG | 9540 / 95 — Structural Shapes, Nonferrous Base Metal |
| Status | ACTIVE |
| Right Side Top Flange Thickness | 0.050 INCHES NOMINAL IN |
| Length | 10.000 FEET MINIMUM AND 12.000 FEET MAXIMUM FT |
| Left Side Top Flange Distance to Center of Both Flanges | 1.205 INCHES NOMINAL IN |
| Right Top Inside Angle | 83.30 DEGREES NOMINAL |
| Left Top Inside Angle | 96.30 DEGREES NOMINAL |
| Heat Treatment | T-6 SOLUTION HEAT TREATED |
| Material Document and Classification | AMS-Q-A-200/11 FED SPEC SINGLE MATERIAL RESPONSE |
| Fillet Radius Where Top Left Flange Joins Web Flange/leg | 0.125 INCHES NOMINAL IN |
| Basic Shape Style | T SHAPE |
| Weight Per Unit Measure | 0.215 POUNDS PER LINEAR FOOT LBS |
| Nondefinitive Spec/std Data | T6 TEMPER |
| Top Flange Width | 2.500 INCHES NOMINAL IN |
| Third Tip Relationship to Preceding Tips | IDENTICAL W/FIRST TIP |
| Material | ALUMINUM ALLOY 7075 |
| Fabrication Method | EXTRUDED |
| Leg Thickness | 0.050 INCHES NOMINAL IN |
| First Tip Style | SQUARE END |
| Left Side Top Flange Thickness | 0.050 INCHES NOMINAL IN |
| Second Tip Relationship to First Tip | IDENTICAL |
| Right Side Top Flange Distance to Center of Both Flanges | 1.295 INCHES NOMINAL IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| 40-029-1 | 3/2 Design control — primary reference U.S. Government activity |
| AMS-QQ-A-200/11 | 5/9 Secondary reference U.S. Government activity |
| QQ-A-200/11 | 5/9 Secondary reference U.S. Government activity |
| 60-12152 | 3/1 Design control — primary reference Transtar Metals Corp |
| AMS-QQ-A-200/11 | 3/1 Design control — primary reference Sae International Dba Sae International |
NSN 9540-01-166-2657 is a Beam,structural, classified under FSC 9540, Structural Shapes, Nonferrous Base Metal. Status: active.
1 possible match (shared part number, not a government interchangeability claim): 4220-01-241-0913. Verify interchangeability with system specifications before substitution.
Key specifications for 9540-01-166-2657: Overall Height: 0.993 INCHES NOMINAL IN; Right Side Top Flange Thickness: 0.050 INCHES NOMINAL IN; Length: 10.000 FEET MINIMUM AND 12.000 FEET MAXIMUM FT; Left Side Top Flange Distance to Center of Both Flanges: 1.205 INCHES NOMINAL IN. 20 specifications are documented in the U.S. Government catalog.
No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-16.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.