The Hydra,lok Cap Assembly, cataloged under National Stock Number 4210-01-102-0503, is classified within Federal Supply Class 4210 (Firefighting Equipment) of the Fire Fighting, Rescue, and Safety Equipment group. Government technical data includes 1 specification, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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.
| Parameter | Value |
|---|---|
| NSN | 4210-01-102-0503 |
| Item Name | Hydra,lok Cap Assembly |
| FSC / FSG | 4210 / 42 — Firefighting Equipment |
| Status | ACTIVE |
| General Characteristics Item Description | C/O CAP BODY,GASKET,VALVE HALF,THREE AND FOUR LOOP,2 LOCKING STEM,2 VALVE SPRING,CENTER SPRING,4.500 IN. LG IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | Possible hazard — SDS may be required (DLA HMIC P) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| 245000 | 3/9 Design control — primary reference U S Forged Products Hydra-Shield Mfg Inc |
NSN 4210-01-102-0503 is a Hydra,lok Cap Assembly, classified under FSC 4210, Firefighting Equipment. Status: active.
1 possible match (shared part number, not a government interchangeability claim): 6550-01-560-0897. Verify interchangeability with system specifications before substitution.
Key specifications for 4210-01-102-0503: General Characteristics Item Description: C/O CAP BODY,GASKET,VALVE HALF,THREE AND FOUR LOOP,2 LOCKING STEM,2 VALVE SPRING,CENTER SPRING,4.500 IN. LG IN; End Item Identification: USED AS A QUICK COUPLING ON THE FIRE HYDRANT. 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.