The Washer,flat, cataloged under National Stock Number 5310-01-541-4552, 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 2 manufacturer part numbers 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 5310-01-541-4552 |
| Primary Part Number | S2931983-30A03 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Anillo Industries Llc |
| Status | ACTIVE |
| Surface Treatment Document and Classification | MIL-A-8625, TYPE II, CLASS 2 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Overall Diameter | 0.480 INCHES NOMINAL IN |
| Material Document and Classification | QQ-A-250/12 FED SPEC SINGLE MATERIAL RESPONSE OR QQ-A-225/9 FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Cross-Sectional Shape Style | RECTANGULAR |
| Surface Treatment | ANODIZE OVERALL |
| Peripheral Shape Style | ROUND |
| Material | ALUMINUM ALLOY 7075 OVERALL |
| Center Hole Shape Style | ROUND |
| Hole Diameter | 0.232 INCHES MINIMUM AND 0.240 INCHES MAXIMUM IN |
| Thickness | 0.031 INCHES NOMINAL 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 |
|---|---|
| S2931983-30A03 PRIMARY | Anillo Industries Llc (USA) |
| S2931983-30A03 PRIMARY | Moeller Manufacturing & Supply, Llc (USA) |
| Reference | Meaning |
|---|---|
| S2931983-30A03 | 5/2 Secondary reference U.S. Government activity |
NSN 5310-01-541-4552 is a Washer,flat, manufactured by Anillo Industries Llc, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-541-4552 has 2 manufacturer part numbers on file: S2931983-30A03 (Anillo Industries Llc), S2931983-30A03 (Moeller Manufacturing & Supply, Llc).
Key specifications for S2931983-30A03: Surface Treatment Document and Classification: MIL-A-8625, TYPE II, CLASS 2 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL; Overall Diameter: 0.480 INCHES NOMINAL IN; Material Document and Classification: QQ-A-250/12 FED SPEC SINGLE MATERIAL RESPONSE OR QQ-A-225/9 FED SPEC 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.