The Parts Kit,diving Helmet, cataloged under National Stock Number 4220-01-397-5731, is classified within Federal Supply Class 4220 (Marine Lifesaving and Diving Equipment) of the Fire Fighting, Rescue, and Safety Equipment group. The manufacturer of record is Kirby Morgan Dive Systems Inc. Government technical data includes 4 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through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4220-01-397-5731 |
| Primary Part Number | 525-309 |
| Item Name | Parts Kit,diving Helmet |
| FSC / FSG | 4220 / 42 — Marine Lifesaving and Diving Equipment |
| Manufacturer | Kirby Morgan Dive Systems Inc |
| Status | ACTIVE |
| Component Quantity | 15 |
| End Item Source | 58366 |
| End Item Name | HELMENT |
| Nonsupply Items and Quantities | PACKING,PREFORMED 2, VALVE 2, DIAPHRAGM 1, WASHER 2, SCREW 1, NUT 1, PIN 1, SPRING 2, LEVER 1, NIPPLE 1, SPACER 1 |
| 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 |
|---|---|
| 525-309 PRIMARY | Kirby Morgan Dive Systems Inc (USA) |
| Reference | Meaning |
|---|---|
| F8281-000004 | 6/9 Informative reference only Forsvarets Materielverk |
| 10332384 | 6/9 Informative reference only Nimikkeistokeskus Ncb Finland |
| 525-034 | 5/9 Secondary reference U.S. Government activity |
| 525-034 | 5/9 Secondary reference Kirby Morgan Dive Systems Inc |
NSN 4220-01-397-5731 is a Parts Kit,diving Helmet, manufactured by Kirby Morgan Dive Systems Inc, classified under FSC 4220, Marine Lifesaving and Diving Equipment. Status: active.
NSN 4220-01-397-5731 has 1 manufacturer part number on file: 525-309 (Kirby Morgan Dive Systems Inc).
Key specifications for 525-309: Component Quantity: 15; End Item Source: 58366; End Item Name: HELMENT; Nonsupply Items and Quantities: PACKING,PREFORMED 2, VALVE 2, DIAPHRAGM 1, WASHER 2, SCREW 1, NUT 1, PIN 1, SPRING 2, LEVER 1, NIPPLE 1, SPACER 1. 4 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.