The Lock,flush, cataloged under National Stock Number 5340-00-481-4304, is classified within Federal Supply Class 5340 (Hardware, Commercial) of the Hardware and Abrasives group. The manufacturer of record is Marathonnorco Aerospace, Inc.. Government technical data includes 3 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 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 | 5340-00-481-4304 |
| Primary Part Number | CL203 |
| Item Name | Lock,flush |
| FSC / FSG | 5340 / 53 — Hardware, Commercial |
| Manufacturer | Marathonnorco Aerospace, Inc. |
| Status | ACTIVE |
| Design Type | DEAD BOLT |
| Bolt Type | SINGLE BEVEL NONREVERSIBLE |
| Thickness | 1.218 INCHES MINIMUM MEMBER 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 |
| Part Number | Manufacturer |
|---|---|
| CL203 PRIMARY | Marathonnorco Aerospace, Inc. (USA) |
NSN 5340-00-481-4304 is a Lock,flush, manufactured by Marathonnorco Aerospace, Inc., classified under FSC 5340, Hardware, Commercial. Status: active.
NSN 5340-00-481-4304 has 1 manufacturer part number on file: CL203 (Marathonnorco Aerospace, Inc.).
1 possible match (shared part number, not a government interchangeability claim): 4310-01-156-7370. Verify interchangeability with system specifications before substitution.
Key specifications for CL203: Design Type: DEAD BOLT; Bolt Type: SINGLE BEVEL NONREVERSIBLE; Special Features: LOCKING MECHANISM TYPE:SPRING TUMBLER;MASTER KEY PROVISION:NOT INCLUDED;; Thickness: 1.218 INCHES MINIMUM MEMBER IN. 3 specifications are 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.