The Plug Assembly,sealing, cataloged under National Stock Number 5340-00-255-9801, is classified within Federal Supply Class 5340 (Hardware, Commercial) of the Hardware and Abrasives group. Government technical data includes 1 specification, cited from the U.S. Government catalog. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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. Unit of issue: EA.
| Parameter | Value |
|---|---|
| NSN | 5340-00-255-9801 |
| Item Name | Plug Assembly,sealing |
| FSC / FSG | 5340 / 53 — Hardware, Commercial |
| Status | ACTIVE |
| Overall Diameter | 0.665 INCHES MINIMUM AND 0.666 INCHES MAXIMUM IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | Possible hazard — SDS may be required (DLA HMIC P) |
| Criticality Code | X |
| Unit of Issue | EA |
| Reference | Meaning |
|---|---|
| 10117305 | 6/9 Informative reference only Nimikkeistokeskus Ncb Finland |
| PLGA6661020A | 3/2 Design control — primary reference U.S. Government activity |
| PLGA6661020 | 5/2 Secondary reference U.S. Government activity |
| 666102 | 5/9 Secondary reference U.S. Government activity |
NSN 5340-00-255-9801 is a Plug Assembly,sealing, classified under FSC 5340, Hardware, Commercial. Status: active.
1 possible match (shared part number, not a government interchangeability claim): 6625-01-034-0337. Verify interchangeability with system specifications before substitution.
Key specifications for 5340-00-255-9801: Overall Diameter: 0.665 INCHES MINIMUM AND 0.666 INCHES MAXIMUM IN; Special Features: CONSISTS OF PLUG PART NO. PLGA6667020A; PIN PART NO. PLGA6566020A; CRES STEEL O/A; CLEAR PASSIVATE FINISH O/A; WAS COATED PIN; 0.743 IN. MIN 0.757 IN. MAX LG O/A; 0.060 IN. MAX DIA HOLE THRU CENTER OF PIN; 14 GROOVES 0.020 IN. W 0.005 DEEP ON PLUG OD 0.625 IN. NOM LG FROM OPEN END 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.