The Expander Tool,seal Ring, cataloged under National Stock Number 3655-00-606-7329, is classified within Federal Supply Class 3655 (Gas Generating and Dispensing Systems, Fixed or Mobile) of the Special Industry Machinery group. The manufacturer of record is Cosmodyne, Llc Dba Cosmodyne Llc. Government technical data includes 1 specification, 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 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 | 3655-00-606-7329 |
| Primary Part Number | 2121025 |
| Item Name | Expander Tool,seal Ring |
| FSC / FSG | 3655 / 36 — Gas Generating and Dispensing Systems, Fixed or Mobile |
| Manufacturer | Cosmodyne, Llc Dba Cosmodyne Llc |
| Status | ACTIVE |
| General Characteristics Item Description | ALUMINUM ALLOY,2024,T351,6.975 IN. MIN 6.980 IN. MAX OD,4.000 IN. ID,2.250 IN. THK,25 MICROINCH FINIS IN |
| 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 |
|---|---|
| 2121025 PRIMARY | Cosmodyne, Llc Dba Cosmodyne Llc (USA) |
NSN 3655-00-606-7329 is a Expander Tool,seal Ring, manufactured by Cosmodyne, Llc Dba Cosmodyne Llc, classified under FSC 3655, Gas Generating and Dispensing Systems, Fixed or Mobile. Status: active.
NSN 3655-00-606-7329 has 1 manufacturer part number on file: 2121025 (Cosmodyne, Llc Dba Cosmodyne Llc).
2 possible matches (shared part number, not a government interchangeability claim): 1440-00-888-3379, 5950-01-052-9313. Verify interchangeability with system specifications before substitution.
Key specifications for 2121025: General Characteristics Item Description: ALUMINUM ALLOY,2024,T351,6.975 IN. MIN 6.980 IN. MAX OD,4.000 IN. ID,2.250 IN. THK,25 MICROINCH FINIS IN. 1 specification is 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.