The Beam,structural, cataloged under National Stock Number 9540-01-428-2771, is classified within Federal Supply Class 9540 (Structural Shapes, Nonferrous Base Metal) of the Metal Bars, Sheets, and Shapes group. Government technical data includes 22 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 9540-01-428-2771 |
| Item Name | Beam,structural |
| FSC / FSG | 9540 / 95 — Structural Shapes, Nonferrous Base Metal |
| Status | ACTIVE |
| First Tip Inner Radius | 0.062 INCHES NOMINAL IN |
| Right Side Top Flange Thickness | 0.830 INCHES NOMINAL IN |
| Length | 12.000 FEET NOMINAL FT |
| Left Side Top Flange Distance to Center of Both Flanges | 1.640 INCHES NOMINAL IN |
| Right Top Inside Angle | 96.0 DEGREES NOMINAL |
| Left Top Inside Angle | 84.0 DEGREES NOMINAL |
| Heat Treatment | ANNEALED |
| Fillet Radius Where Top Right Flange Joins Web Flange/leg | 0.580 INCHES NOMINAL IN |
| Material Document and Classification | MIL-T-81556, COMP AB-1 MIL SPEC SINGLE MATERIAL RESPONSE |
| Fillet Radius Where Top Left Flange Joins Web Flange/leg | 0.580 INCHES NOMINAL IN |
| Basic Shape Style | T SHAPE |
| Nondefinitive Spec/std Data | AB-1 COMPOSITION AND A CONDITION |
| Top Flange Width | 3.650 INCHES NOMINAL IN |
| Third Tip Relationship to Preceding Tips | IDENTICAL W/FIRST TIP |
| Material | TITANIUM ALLOY |
| Fabrication Method | EXTRUDED |
| First Tip Outer Radius | 0.062 INCHES NOMINAL IN |
| Leg Thickness | 0.370 INCHES NOMINAL IN |
| First Tip Style | SQUARE W/ INNER AND OUTER CORNER RADII |
| Left Side Top Flange Thickness | 0.830 INCHES NOMINAL IN |
| Second Tip Relationship to First Tip | IDENTICAL |
| Right Side Top Flange Distance to Center of Both Flanges | 2.010 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 |
|---|---|
| MIL-T-81556 | 4/1 Identification reference U.S. Government activity |
| CVC10012-1016GA | 3/2 Design control — primary reference U.S. Government activity |
NSN 9540-01-428-2771 is a Beam,structural, classified under FSC 9540, Structural Shapes, Nonferrous Base Metal. Status: active.
Key specifications for 9540-01-428-2771: First Tip Inner Radius: 0.062 INCHES NOMINAL IN; Overall Height: 5.200 INCHES NOMINAL IN; Right Side Top Flange Thickness: 0.830 INCHES NOMINAL IN; Length: 12.000 FEET NOMINAL FT. 22 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.