The Washer,key, cataloged under National Stock Number 5310-00-550-9537, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Fmc Corp. Government technical data includes 9 specifications, cited from the U.S. Government catalog. The record lists 3 manufacturer part numbers 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through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 5310-00-550-9537 |
| Primary Part Number | 1234772PC3 |
| Item Name | Washer,key |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Fmc Corp |
| Status | ACTIVE |
| Overall Distance Including Keys | 1.313 INCHES NOMINAL IN |
| Style Designator | KEY |
| Material Document and Classification | QQ-S-763 FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Outside Diameter | 0.750 INCHES NOMINAL IN |
| Material Thickness | 0.062 INCHES NOMINAL IN |
| External Straight Key Width | 0.178 INCHES MINIMUM AND 0.188 INCHES MAXIMUM IN |
| External Key Quantity | 6 |
| Material | STEEL COMP 430 OVERALL |
| Hole Diameter | 0.385 INCHES NOMINAL IN |
| 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 |
|---|---|
| 1234772PC3 | Fmc Corp (USA) |
| 1234772 | Fmc Corp (USA) |
| 1216274REVCPC60 | Fmc Corp (USA) |
| Reference | Meaning |
|---|---|
| 1234772PC3 | 5/9 Secondary reference Asset Systems, Inc. Dba Asset Systems Inc |
| 1216274REVCPC60 | 5/9 Secondary reference Asset Systems, Inc. Dba Asset Systems Inc |
| 1234772 | 5/9 Secondary reference Asset Systems, Inc. Dba Asset Systems Inc |
| 3194026REVCPC60 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5310-00-550-9537 is a Washer,key, manufactured by Fmc Corp, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-00-550-9537 has 3 manufacturer part numbers on file: 1234772PC3 (Fmc Corp), 1234772 (Fmc Corp), 1216274REVCPC60 (Fmc Corp).
1 possible match (shared part number, not a government interchangeability claim): 4320-01-492-3285. Verify interchangeability with system specifications before substitution.
Key specifications for 1234772PC3: Overall Distance Including Keys: 1.313 INCHES NOMINAL IN; Style Designator: KEY; Material Document and Classification: QQ-S-763 FED SPEC SINGLE MATERIAL RESPONSE OVERALL; Outside Diameter: 0.750 INCHES NOMINAL IN. 9 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.