The Breech Ring,diver's Helmet, cataloged under National Stock Number 4220-01-237-3251, is classified within Federal Supply Class 4220 (No Item Name Available) of the Fire Fighting, Rescue, and Safety Equipment group. The primary manufacturer of record is Kirby Morgan Dive Systems Inc. Government technical data includes 2 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 3 commercial cross-references from 2 manufacturers, enabling identification through both NSN and commercial part number lookups. 5 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4220-01-237-3251 |
| Primary Part Number | 505-055 |
| Item Name | Breech Ring,diver's Helmet |
| FSC / FSG | 4220 / 42 — No Item Name Available |
| Manufacturer | Kirby Morgan Dive Systems Inc |
| Status | ACTIVE |
| Shape | OVAL |
| Criticality Code Justification | AGAV |
| Acquisition Status | ACTIVE |
| HAZMAT | No |
| Part Number | Manufacturer |
|---|---|
| 505-055 PRIMARY | Kirby Morgan Dive Systems Inc (USA) |
| 505-003 | Kirby Morgan Dive Systems Inc (USA) |
| 592-6318245 | Naval Sea Systems Command (USA) |
NSN 4220-01-237-3251 is a Breech Ring,diver's Helmet, manufactured by Kirby Morgan Dive Systems Inc, classified under FSC 4220 (No Item Name Available). Status: active.
NSN 4220-01-237-3251 has 3 cross-referenced part numbers: 505-055 (Kirby Morgan Dive Systems Inc), 505-003 (Kirby Morgan Dive Systems Inc), 592-6318245 (Naval Sea Systems Command).
There are 5 known substitutes for 4220-01-237-3251: 4140-00-120-1203, 1610-00-547-6066, 5930-00-578-4265 and 2 more. Verify interchangeability with system specifications before substitution.
Key specifications for 505-055: Shape: OVAL; Criticality Code Justification: AGAV; Special Features: NECK CLAMP PART OF 6318240-1 YOKE ASSEMBLY; End Item Identification: UBA MK 21 MOD 1 HELMET ASSEMBLY 6318360. 4 total characteristics are documented in the Federal Logistics Information System.