The Washer,recessed, cataloged under National Stock Number 5310-01-304-5787, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Defense Logistics Agency Dba Defense Supply Center Philadelphia. Government technical data includes 10 specifications, cited from the U.S. Government catalog. The record lists 5 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 5310-01-304-5787 |
| Primary Part Number | 03A257C4A |
| Item Name | Washer,recessed |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Defense Logistics Agency Dba Defense Supply Center Philadelphia |
| Status | ACTIVE |
| Surface Treatment Document and Classification | NAS 4006 ASSN STD SINGLE TREATMENT RESPONSE OVERALL |
| Style Designator | RECESSED |
| Material Document and Classification | AMS 5525 ASSN STD 1ST MATERIAL RESPONSE OR AMS 5737 ASSN STD 1ST MATERIAL RESPONSE OR AMS 5596 ASSN STD 2ND MATERIAL RESPONSE OR AMS 5597 ASSN STD 2ND MATERIAL RESPONSE OR AMS 5662 ASSN STD 2ND MATERIAL RESPONSE OVERALL |
| Outside Diameter | 0.460 INCHES MINIMUM AND 0.470 INCHES MAXIMUM IN |
| Material Thickness | 0.057 INCHES MINIMUM AND 0.069 INCHES MAXIMUM IN |
| Recess Diameter | 0.310 INCHES MINIMUM AND 0.320 INCHES MAXIMUM IN |
| Surface Treatment | ALUMINUM ALLOY OVERALL |
| Material | IRON ALLOY 660 OR NICKEL ALLOY 502 OVERALL |
| Hole Diameter | 0.251 INCHES MINIMUM AND 0.255 INCHES MAXIMUM IN |
| Recess Angle | 80.0 DEGREES MINIMUM AND 100.0 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 |
|---|---|
| AS19879C4A | Anillo Industries Llc (USA) |
| 03A257C4A PRIMARY | Defense Logistics Agency Dba Defense Supply Center Philadelphia (USA) |
| 03A257C4A | Northrop Grumman Systems Corporation Dba Northrop Grumman Is Div Northrop Grumman Aeronautics Systems (USA) |
| 03A257C4A | Northrop Grumman Systems Corp Dba Northrop Grumman Computing Systems (USA) |
| MM118C4A | Moeller Manufacturing & Supply, Llc (USA) |
| Reference | Meaning |
|---|---|
| VN948BF4C | 5/2 Secondary reference U.S. Government activity |
| NS202860C4A | 5/2 Secondary reference U.S. Government activity |
NSN 5310-01-304-5787 is a Washer,recessed, manufactured by Defense Logistics Agency Dba Defense Supply Center Philadelphia, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-304-5787 has 5 manufacturer part numbers on file: AS19879C4A (Anillo Industries Llc), 03A257C4A (Defense Logistics Agency Dba Defense Supply Center Philadelphia), 03A257C4A (Northrop Grumman Systems Corporation Dba Northrop Grumman Is Div Northrop Grumman Aeronautics Systems), 03A257C4A (Northrop Grumman Systems Corp Dba Northrop Grumman Computing Systems), MM118C4A (Moeller Manufacturing & Supply, Llc).
Key specifications for 03A257C4A: Surface Treatment Document and Classification: NAS 4006 ASSN STD SINGLE TREATMENT RESPONSE OVERALL; Style Designator: RECESSED; Material Document and Classification: AMS 5525 ASSN STD 1ST MATERIAL RESPONSE OR AMS 5737 ASSN STD 1ST MATERIAL RESPONSE OR AMS 5596 ASSN STD 2ND MATERIAL RESPONSE OR AMS 5597 ASSN STD 2ND MATERIAL RESPONSE OR AMS 5662 ASSN STD 2ND MATERIAL RESPONSE OVERALL; Outside Diameter: 0.460 INCHES MINIMUM AND 0.470 INCHES MAXIMUM IN. 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.