The Guard,periscope, cataloged under National Stock Number 2540-00-513-9934, is classified within Federal Supply Class 2540 (Vehicular Furniture and Accessories) of the Vehicular Equipment Components group. The manufacturer of record is U S Army Tank Automotive Command Amsta-Im-Mm. Government technical data includes 2 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active. Unit of issue: EA.
| Parameter | Value |
|---|---|
| NSN | 2540-00-513-9934 |
| Primary Part Number | 8668638 |
| Item Name | Guard,periscope |
| FSC / FSG | 2540 / 25 — Vehicular Furniture and Accessories |
| Manufacturer | U S Army Tank Automotive Command Amsta-Im-Mm |
| Status | ACTIVE |
| FSC Application Data | DRIVER HATCH AND PERISCOPE,VEHICULAR |
| General Characteristics Item Description | ARMOR STEEL,CASTING,CLASS 1,SPEC.MIL-S-11356 RECTANGULAR SHAPED,9.000 IN.LG.5.876 IN.W,4.375 IN.H,4 MOUNTING HOLES,EQUALLY SPACED.0.406 IN.DIA.LOCATED 4.500 IN.C TO C ALONG LG,5.000 IN.C TO C ALONG WIDTH IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL D — Destroy Item |
| Hazard | Possible hazard — SDS may be required (DLA HMIC P) |
| Criticality Code | X |
| Unit of Issue | EA |
| Part Number | Manufacturer |
|---|---|
| 8668638 PRIMARY | U S Army Tank Automotive Command Amsta-Im-Mm (USA) |
NSN 2540-00-513-9934 is a Guard,periscope, manufactured by U S Army Tank Automotive Command Amsta-Im-Mm, classified under FSC 2540, Vehicular Furniture and Accessories. Status: active.
NSN 2540-00-513-9934 has 1 manufacturer part number on file: 8668638 (U S Army Tank Automotive Command Amsta-Im-Mm).
1 possible match (shared part number, not a government interchangeability claim): 5975-01-722-1826. Verify interchangeability with system specifications before substitution.
Key specifications for 8668638: FSC Application Data: DRIVER HATCH AND PERISCOPE,VEHICULAR; General Characteristics Item Description: ARMOR STEEL,CASTING,CLASS 1,SPEC.MIL-S-11356 RECTANGULAR SHAPED,9.000 IN.LG.5.876 IN.W,4.375 IN.H,4 MOUNTING HOLES,EQUALLY SPACED.0.406 IN.DIA.LOCATED 4.500 IN.C TO C ALONG LG,5.000 IN.C TO C ALONG WIDTH IN. 2 specifications are documented in the U.S. Government catalog.
Possible hazard — SDS may be required (DLA HMIC P). Hazard information on this page is shown exactly as it appears in the DLA record.
NSN 2540-00-513-9934 has DEMIL Code D. Demilitarization may be required before disposal or transfer to non-military entities.
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.