The Shell Subassembly,flying Helmet, cataloged under National Stock Number 8475-01-142-3687, is classified within Federal Supply Class 8475 (Specialized Flight Clothing and Accessories) of the Clothing, Individual Equipment, and Insignia group. The manufacturer of record is Gentex Corp. Government technical data includes 3 specifications, cited from the U.S. Government catalog. The record lists 3 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 8475-01-142-3687 |
| Primary Part Number | 81D5331-2 |
| Item Name | Shell Subassembly,flying Helmet |
| FSC / FSG | 8475 / 84 — Specialized Flight Clothing and Accessories |
| Manufacturer | Gentex Corp |
| Status | ACTIVE |
| FSC Application Data | USED WITH ANTI-G, ANTI-EXPOSURE AND PRESSURE SUIT TYPES |
| General Characteristics Item Description | SHELL IS A RIGID MATERIAL MADE OF PRESSURE MOLDED LAMINATED GLASS CLOTH; SIZE LARGE; WEIGHT 2.450 LBS LBS |
| Procurement Group Code | 02520 |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL Q — CCL Item — Commerce Control List |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
NSN 8475-01-142-3687 is a Shell Subassembly,flying Helmet, manufactured by Gentex Corp, classified under FSC 8475, Specialized Flight Clothing and Accessories. Status: active.
NSN 8475-01-142-3687 has 3 manufacturer part numbers on file: 81D5331-2 (Gentex Corp), D6749-2K (Gentex Corp), D6749-2K (Transaero, Inc.).
1 possible match (shared part number, not a government interchangeability claim): 8475-01-142-7971. Verify interchangeability with system specifications before substitution.
Key specifications for 81D5331-2: FSC Application Data: USED WITH ANTI-G, ANTI-EXPOSURE AND PRESSURE SUIT TYPES; General Characteristics Item Description: SHELL IS A RIGID MATERIAL MADE OF PRESSURE MOLDED LAMINATED GLASS CLOTH; SIZE LARGE; WEIGHT 2.450 LBS LBS; Procurement Group Code: 02520; End Item Identification: HGU-55/P HELMET. 3 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.
NSN 8475-01-142-3687 has DEMIL Code Q. 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.