The Washer,recessed, cataloged under National Stock Number 5310-01-331-1281, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Northrop Grumman Systems Corp Dba Northrop Grumman Computing Systems. Government technical data includes 11 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-331-1281 |
| Primary Part Number | 03A280C3 |
| Item Name | Washer,recessed |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Northrop Grumman Systems Corp Dba Northrop Grumman Computing Systems |
| Status | ACTIVE |
| Surface Treatment Document and Classification | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Hardness Rating | 36.0 ROCKWELL C MINIMUM AND 45.0 ROCKWELL C MAXIMUM |
| Style Designator | RECESSED |
| Material Document and Classification | AMS5597 ASSN STD SINGLE MATERIAL RESPONSE OR AMS5596 ASSN STD SINGLE MATERIAL RESPONSE OR AMS5662 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Outside Diameter | 0.357 INCHES MINIMUM AND 0.377 INCHES MAXIMUM IN |
| Material Thickness | 0.057 INCHES MINIMUM AND 0.069 INCHES MAXIMUM IN |
| Recess Diameter | 0.238 INCHES MINIMUM AND 0.248 INCHES MAXIMUM IN |
| Surface Treatment | PASSIVATE OVERALL |
| Material | NICKEL ALLOY 718 OVERALL |
| Hole Diameter | 0.191 INCHES MINIMUM AND 0.195 INCHES MAXIMUM IN |
| Recess Angle | 40.0 DEGREES MINIMUM AND 50.0 DEGREES MAXIMUM |
| 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 |
|---|---|
| 03A280C3 | Northrop Grumman Systems Corp Dba Northrop Grumman Computing Systems (USA) |
| MM891C3 | Moeller Manufacturing & Supply, Llc (USA) |
| AS32990C3 | Anillo Industries Llc (USA) |
| Reference | Meaning |
|---|---|
| NS202859-3 | 3/2 Design control — primary reference U.S. Government activity |
| NS202859C3 | 5/2 Secondary reference U.S. Government activity |
| VN948YNP3C | 3/2 Design control — primary reference U.S. Government activity |
NSN 5310-01-331-1281 is a Washer,recessed, manufactured by Northrop Grumman Systems Corp Dba Northrop Grumman Computing Systems, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-331-1281 has 3 manufacturer part numbers on file: 03A280C3 (Northrop Grumman Systems Corp Dba Northrop Grumman Computing Systems), MM891C3 (Moeller Manufacturing & Supply, Llc), AS32990C3 (Anillo Industries Llc).
Key specifications for 03A280C3: Surface Treatment Document and Classification: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL; Hardness Rating: 36.0 ROCKWELL C MINIMUM AND 45.0 ROCKWELL C MAXIMUM; Style Designator: RECESSED; Material Document and Classification: AMS5597 ASSN STD SINGLE MATERIAL RESPONSE OR AMS5596 ASSN STD SINGLE MATERIAL RESPONSE OR AMS5662 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.