The Undershirt,flame Resistant, cataloged under National Stock Number 8415-01-643-8663, is classified within Federal Supply Class 8415 (Clothing, Special Purpose) of the Clothing, Individual Equipment, and Insignia group. Government technical data includes 3 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 4 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 8415-01-643-8663 |
| Item Name | Undershirt,flame Resistant |
| FSC / FSG | 8415 / 84 — Clothing, Special Purpose |
| Status | ACTIVE |
| Garment Size | SMALL MAINBODY |
| Garment Sleeve Length | QUARTER LENGTH |
| Supplementary Features | COLOR-TAN 499 |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | Possible hazard — SDS may be required (DLA HMIC P) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| GL/PD 12-06 | 3/1 Design control — primary reference U.S. Government activity |
NSN 8415-01-643-8663 is a Undershirt,flame Resistant, classified under FSC 8415, Clothing, Special Purpose. Status: active.
4 possible matches (shared part number, not a government interchangeability claim): 8415-01-643-8664, 8415-01-643-8665, 8415-01-643-8667. Verify interchangeability with system specifications before substitution.
Key specifications for 8415-01-643-8663: Garment Size: SMALL MAINBODY; Garment Sleeve Length: QUARTER LENGTH; Supplementary Features: COLOR-TAN 499; Special Features: SHORT SLEEVES; FREE. 3 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.
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.