The Gasket, cataloged under National Stock Number 5330-00-172-6820, is classified within Federal Supply Class 5330 (Packing and Gasket Materials) of the Hardware and Abrasives group. The manufacturer of record is Mid-America Aerotech, Llc. Government technical data includes 11 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5330-00-172-6820 |
| Primary Part Number | 40A331 |
| Item Name | Gasket |
| FSC / FSG | 5330 / 53 — Packing and Gasket Materials |
| Manufacturer | Mid-America Aerotech, Llc |
| Status | ACTIVE |
| Surface Treatment Document and Classification | QQ-S-365 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Cross-Sectional Thickness | 0.028 INCHES NOMINAL IN |
| Precious Material | SILVER |
| Style Designator | CIRCULAR |
| Material Document and Classification | QQ-C-576 FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Cross-Sectional Shape Style | RECTANGULAR METAL |
| Outside Diameter | 1.932 INCHES MINIMUM AND 1.942 INCHES MAXIMUM IN |
| Aperture Diameter | 1.692 INCHES MINIMUM AND 1.702 INCHES MAXIMUM IN |
| Surface Treatment | SILVER OVERALL |
| Precious Material and Location | EXTERNAL SURFACE SILVER |
| Material | COPPER ALLOY OVERALL |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | Possible hazard — SDS may be required (DLA HMIC P) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 40A331 | Mid-America Aerotech, Llc (USA) |
| Reference | Meaning |
|---|---|
| 40A331 | 3/9 Design control — primary reference U.S. Government activity |
| 40A331 | 5/9 Secondary reference Moog Inc Div Moog Inc., Space and Defense - Salt Lake City |
NSN 5330-00-172-6820 is a Gasket, manufactured by Mid-America Aerotech, Llc, classified under FSC 5330, Packing and Gasket Materials. Status: active.
NSN 5330-00-172-6820 has 1 manufacturer part number on file: 40A331 (Mid-America Aerotech, Llc).
Key specifications for 40A331: Surface Treatment Document and Classification: QQ-S-365 FED SPEC SINGLE TREATMENT RESPONSE OVERALL; Cross-Sectional Thickness: 0.028 INCHES NOMINAL IN; Precious Material: SILVER; Style Designator: CIRCULAR. 11 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.