The Collar,hatch, cataloged under National Stock Number 2040-01-421-0078, is classified within Federal Supply Class 2040 (Marine Hardware and Hull Items) of the Ship and Marine Equipment group. The manufacturer of record is Bath Iron Works Corporation. Government technical data includes 2 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 6 items share a part number with this NSN in the catalog (possible match — not a government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 | 2040-01-421-0078 |
| Primary Part Number | 8100-1252-0236 PT NO 308 |
| Item Name | Collar,hatch |
| FSC / FSG | 2040 / 20 — Marine Hardware and Hull Items |
| Manufacturer | Bath Iron Works Corporation |
| Status | ACTIVE |
| Overall Diameter | 0.875 INCHES NOMINAL IN |
| Material | STEEL |
| 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 |
|---|---|
| 8100-1252-0236 PT NO 308 PRIMARY | Bath Iron Works Corporation (USA) |
| Reference | Meaning |
|---|---|
| 8100-1252-0236 | D/9 Drawing number reference only Bath Iron Works Corporation |
NSN 2040-01-421-0078 is a Collar,hatch, manufactured by Bath Iron Works Corporation, classified under FSC 2040, Marine Hardware and Hull Items. Status: active.
NSN 2040-01-421-0078 has 1 manufacturer part number on file: 8100-1252-0236 PT NO 308 (Bath Iron Works Corporation).
6 possible matches (shared part number, not a government interchangeability claim): 2040-01-421-0082, 2040-01-459-0079, 5310-01-477-4539. Verify interchangeability with system specifications before substitution.
Key specifications for 8100-1252-0236 PT NO 308: Overall Diameter: 0.875 INCHES NOMINAL IN; End Item Identification: HATCH; Material: STEEL. 2 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.