The Disk,valve, cataloged under National Stock Number 1660-01-054-8650, 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 Hamilton Sundstrand Corporation Dba Collins Aerospace. 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 3 items share a part number with this NSN in the catalog (possible match — not a government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 | 1660-01-054-8650 |
| Primary Part Number | 28959 |
| Item Name | Disk,valve |
| FSC / FSG | 1660 / 16 — Aircraft Air Conditioning, Heating, and Pressurizing Equipment |
| Manufacturer | Hamilton Sundstrand Corporation Dba Collins Aerospace |
| Status | ACTIVE |
| Outside Diameter | 2.370 INCHES NOMINAL IN |
| Inside Diameter | 2.166 INCHES NOMINAL IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 28959 PRIMARY | Hamilton Sundstrand Corporation Dba Collins Aerospace (USA) |
| Reference | Meaning |
|---|---|
| 28959 | 5/9 Secondary reference United Technologies Corp Hamilton Sundstrand Corp |
NSN 1660-01-054-8650 is a Disk,valve, manufactured by Hamilton Sundstrand Corporation Dba Collins Aerospace, classified under FSC 1660, Aircraft Air Conditioning, Heating, and Pressurizing Equipment. Status: active.
NSN 1660-01-054-8650 has 1 manufacturer part number on file: 28959 (Hamilton Sundstrand Corporation Dba Collins Aerospace).
3 possible matches (shared part number, not a government interchangeability claim): 3120-01-067-3318, 6680-01-409-1796, 4920-01-415-5757. Verify interchangeability with system specifications before substitution.
Key specifications for 28959: Overall Height: 0.248 INCHES MINIMUM AND 0.255 INCHES MAXIMUM IN; Outside Diameter: 2.370 INCHES NOMINAL IN; Inside Diameter: 2.166 INCHES NOMINAL IN; Special Features: VALVE PN11131-2 ACFT F16A/B; ANODIZE PER MIL-A-8625 TYPE II CLASS I; 4 HOLES 0.147 IN. DIA THRU CSK 120.0 DEG TO 0.170 IN.-0.210 IN. DIA TAP FOR 6-32 HELICAL COIL INSERT PN MS21209C0615 IN. 2 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.
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.