The Washer,flat, cataloged under National Stock Number 5310-01-597-1840, 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 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-597-1840 |
| Primary Part Number | MA3453-120 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Sae International Dba Sae International |
| Status | ACTIVE |
| Surface Treatment Document and Classification | MA1784 FED STD SINGLE TREATMENT RESPONSE OVERALL |
| Overall Diameter | 20.5 MILLIMETERS MINIMUM AND 21.0 MILLIMETERS MAXIMUM MM |
| Hardness Rating | 24.0 ROCKWELL C MINIMUM AND 35.0 ROCKWELL C MAXIMUM OR 247.0 ROCKWELL B MINIMUM AND 327.0 ROCKWELL B MAXIMUM |
| Material Document and Classification | AMS-5525 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Cross-Sectional Shape Style | RECTANGULAR |
| Surface Treatment | PASSIVATE OVERALL |
| Peripheral Shape Style | ROUND |
| Material | STEEL CORROSION RESISTING OVERALL |
| Center Hole Shape Style | ROUND |
| Hole Diameter | 13.3 MILLIMETERS MINIMUM AND 13.5 MILLIMETERS MAXIMUM MM |
| Thickness | 2.3 MILLIMETERS MINIMUM AND 2.7 MILLIMETERS MAXIMUM MM |
| 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 |
|---|---|
| MA3453-120 PRIMARY | Sae International Dba Sae International (USA) |
| Reference | Meaning |
|---|---|
| MA3453-120 | 3/9 Design control — primary reference U.S. Government activity |
NSN 5310-01-597-1840 is a Washer,flat, manufactured by Sae International Dba Sae International, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-597-1840 has 1 manufacturer part number on file: MA3453-120 (Sae International Dba Sae International).
Key specifications for MA3453-120: Surface Treatment Document and Classification: MA1784 FED STD SINGLE TREATMENT RESPONSE OVERALL; Overall Diameter: 20.5 MILLIMETERS MINIMUM AND 21.0 MILLIMETERS MAXIMUM MM; Hardness Rating: 24.0 ROCKWELL C MINIMUM AND 35.0 ROCKWELL C MAXIMUM OR 247.0 ROCKWELL B MINIMUM AND 327.0 ROCKWELL B MAXIMUM; Material Document and Classification: AMS-5525 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.
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.