The Washer,flat, cataloged under National Stock Number 5310-01-439-2684, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Anillo Industries Llc. Government technical data includes 10 specifications, cited from the U.S. Government catalog. The record lists 4 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-439-2684 |
| Primary Part Number | AS32990-4A |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Anillo Industries Llc |
| Status | ACTIVE |
| Overall Diameter | 0.460 INCHES MINIMUM AND 0.470 INCHES MAXIMUM IN |
| Hardness Rating | 36.0 ROCKWELL C MINIMUM AND 45.0 ROCKWELL C MAXIMUM |
| Material Document and Classification | AMS5596 ASSN STD SINGLE MATERIAL RESPONSE OR AMS5597 ASSN STD SINGLE MATERIAL RESPONSE OR AMS5662 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Cross-Sectional Shape Style | RECTANGULAR |
| Surface Treatment | ALUMINUM ALLOY OVERALL |
| Peripheral Shape Style | ROUND |
| Material | NICKEL ALLOY 718 OVERALL |
| Center Hole Shape Style | ROUND |
| Hole Diameter | 0.252 INCHES MINIMUM AND 0.255 INCHES MAXIMUM IN |
| Thickness | 0.057 INCHES MINIMUM AND 0.069 INCHES MAXIMUM 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 |
|---|---|
| 03A280-4A | Northrop Grumman Systems Corp Dba Northrop Grumman Computing Systems (USA) |
| MM891-4A | Moeller Manufacturing & Supply, Llc (USA) |
| 03A280-4A | Northrop Grumman Systems Corporation Dba Northrop Grumman Is Div Northrop Grumman Aeronautics Systems (USA) |
| AS32990-4A PRIMARY | Anillo Industries Llc (USA) |
| Reference | Meaning |
|---|---|
| NS202859-4A | 5/2 Secondary reference U.S. Government activity |
| VN948YNP4-A | 5/2 Secondary reference U.S. Government activity |
NSN 5310-01-439-2684 is a Washer,flat, manufactured by Anillo Industries Llc, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-439-2684 has 4 manufacturer part numbers on file: 03A280-4A (Northrop Grumman Systems Corp Dba Northrop Grumman Computing Systems), MM891-4A (Moeller Manufacturing & Supply, Llc), 03A280-4A (Northrop Grumman Systems Corporation Dba Northrop Grumman Is Div Northrop Grumman Aeronautics Systems), AS32990-4A (Anillo Industries Llc).
Key specifications for AS32990-4A: Overall Diameter: 0.460 INCHES MINIMUM AND 0.470 INCHES MAXIMUM IN; Hardness Rating: 36.0 ROCKWELL C MINIMUM AND 45.0 ROCKWELL C MAXIMUM; Material Document and Classification: AMS5596 ASSN STD SINGLE MATERIAL RESPONSE OR AMS5597 ASSN STD SINGLE MATERIAL RESPONSE OR AMS5662 ASSN STD SINGLE MATERIAL RESPONSE OVERALL; Cross-Sectional Shape Style: RECTANGULAR. 10 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.