The Washer,flat, cataloged under National Stock Number 5310-00-945-0528, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Sae International Dba Sae International. Government technical data includes 11 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 11 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 6 items share a part number with this NSN in the catalog (possible match — not a government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: Cancelled.
| Parameter | Value |
|---|---|
| NSN | 5310-00-945-0528 |
| Primary Part Number | MS9321-11 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Sae International Dba Sae International |
| Status | CANCELLED |
| Surface Finish | 63.0 MICROINCHES BOTTOM |
| Surface Finish | 63.0 MICROINCHES TOP |
| Overall Diameter | 0.625 INCHES NOMINAL IN |
| Material Document and Classification | AMS 5510 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Cross-Sectional Shape Style | RECTANGULAR |
| Surface Treatment | PASSIVATE OVERALL |
| Peripheral Shape Style | ROUND |
| Material | STEEL COMP 321 OVERALL |
| Center Hole Shape Style | ROUND |
| Hole Diameter | 0.333 INCHES MINIMUM AND 0.343 INCHES MAXIMUM IN |
| Thickness | 0.062 INCHES NOMINAL IN |
| Acquisition Status | CANCELLED |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| MS9321-11 PRIMARY | Sae International Dba Sae International (USA) |
| 9682013246 | Pilatus Aircraft Ltd (CHE) |
| Reference | Meaning |
|---|---|
| 236-1170P15 | E/8 Replaced / superseded reference Raytheon Company Div Corp |
| 301250 | C/1 Advisory reference — outside the item-of-supply concept Evinrude Motors Product Group of Outboard Marine Corp |
| MS9321-11 | 5/9 Secondary reference U.S. Government activity |
| 5310PL0211511 | 6/9 Informative reference only Jednolity Indeks Materialowy - Uniform Material Index |
| 5310009450528 | 6/9 Informative reference only E.c.a Etablissement Central Des Approvisionnements Des Forces Armees Royales |
| 968.20.13.246 | 5/9 Secondary reference Pilatus Aircraft Ltd |
| N400P42 | C/1 Advisory reference — outside the item-of-supply concept General Electric Company |
| 2-805-008-375 | C/1 Advisory reference — outside the item-of-supply concept Viking Pump, Inc |
| 236-1170P15 | E/8 Replaced / superseded reference Raytheon Company Dba Raytheon Co |
| 10121865 | 6/9 Informative reference only Nimikkeistokeskus Ncb Finland |
| MS9321-11 | 3/9 Design control — primary reference U.S. Government activity |
NSN 5310-00-945-0528 is a Washer,flat, manufactured by Sae International Dba Sae International, classified under FSC 5310, Nuts and Washers. Status: cancelled.
NSN 5310-00-945-0528 has 2 manufacturer part numbers on file: MS9321-11 (Sae International Dba Sae International), 9682013246 (Pilatus Aircraft Ltd).
6 possible matches (shared part number, not a government interchangeability claim): 6210-01-301-8634, 5310-01-331-9213, 4935-01-412-6739. Verify interchangeability with system specifications before substitution.
Key specifications for MS9321-11: Surface Finish: 63.0 MICROINCHES BOTTOM; Surface Finish: 63.0 MICROINCHES TOP; Overall Diameter: 0.625 INCHES NOMINAL IN; Material Document and Classification: AMS 5510 ASSN STD SINGLE MATERIAL RESPONSE OVERALL. 11 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.
NSN 5310-00-945-0528 is currently cancelled. Check with the Defense Logistics Agency for current availability and authorized substitutes.
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.