The Bellows,pressure, cataloged under National Stock Number 1660-01-081-6341, is classified within Federal Supply Class 1660 (Aircraft Air Conditioning, Heating, and Pressurizing Equipment) of the Aircraft Components and Accessories group. The manufacturer of record is Senior Operations Llc Dba Metal Bellows Div Metal Bellows. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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 | 1660-01-081-6341 |
| Primary Part Number | 75799 |
| Item Name | Bellows,pressure |
| FSC / FSG | 1660 / 16 — Aircraft Air Conditioning, Heating, and Pressurizing Equipment |
| Manufacturer | Senior Operations Llc Dba Metal Bellows Div Metal Bellows |
| Status | ACTIVE |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL B — Remove Demilitarization Key Points |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 75799 | Senior Operations Llc Dba Metal Bellows Div Metal Bellows (USA) |
| 817317-1 | Leonardo S.p.a. Div Electronics (ITA) |
| Reference | Meaning |
|---|---|
| 817317-1 | 5/9 Secondary reference Fiar Fabbrica Italiana Apparecchiature Radioelettriche Spa |
| 75799 | 5/9 Secondary reference Senior Flexonics Inc |
| 817317-1 | 3/2 Design control — primary reference U.S. Government activity |
NSN 1660-01-081-6341 is a Bellows,pressure, manufactured by Senior Operations Llc Dba Metal Bellows Div Metal Bellows, classified under FSC 1660, Aircraft Air Conditioning, Heating, and Pressurizing Equipment. Status: active.
NSN 1660-01-081-6341 has 2 manufacturer part numbers on file: 75799 (Senior Operations Llc Dba Metal Bellows Div Metal Bellows), 817317-1 (Leonardo S.p.a. Div Electronics).
2 possible matches (shared part number, not a government interchangeability claim): 3825-01-123-8852, 3110-01-468-6545. Verify interchangeability with system specifications before substitution.
Key specifications for 75799: Special Features: 0D 4.500 IN. NOM,ID 3.344 IN. NOM,6 HOLES 0.159 IN. DIA X 0.190 IN. DIA 0.190-32 UNF-2B,6 HOLES 0.189 IN. DIA,1.180 IN. FREE LENGTH IN. 0 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 1660-01-081-6341 has DEMIL Code B. 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.