The Washer,flat, cataloged under National Stock Number 5310-01-379-5503, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Bae Systems Information and Electronic Systems Integration Inc.. Government technical data includes 10 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 5310-01-379-5503 |
| Primary Part Number | A312A177-101 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Bae Systems Information and Electronic Systems Integration Inc. |
| Status | ACTIVE |
| Surface Treatment Document and Classification | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Overall Diameter | 0.515 INCHES MINIMUM AND 0.525 INCHES MAXIMUM IN |
| Material Document and Classification | MIL-S-5059 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Cross-Sectional Shape Style | RECTANGULAR |
| Surface Treatment | PASSIVATE OVERALL |
| Peripheral Shape Style | ROUND |
| Material | STEEL COMP 301 OVERALL |
| Center Hole Shape Style | ROUND |
| Hole Diameter | 0.315 INCHES MINIMUM AND 0.318 INCHES MAXIMUM IN |
| Thickness | 0.029 INCHES MINIMUM AND 0.033 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 |
|---|---|
| A312A177-101 PRIMARY | Bae Systems Information and Electronic Systems Integration Inc. (USA) |
| Reference | Meaning |
|---|---|
| A312A177-101 | 5/2 Secondary reference U.S. Government activity |
NSN 5310-01-379-5503 is a Washer,flat, manufactured by Bae Systems Information and Electronic Systems Integration Inc., classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-379-5503 has 1 manufacturer part number on file: A312A177-101 (Bae Systems Information and Electronic Systems Integration Inc.).
Key specifications for A312A177-101: Surface Treatment Document and Classification: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL; Overall Diameter: 0.515 INCHES MINIMUM AND 0.525 INCHES MAXIMUM IN; Material Document and Classification: MIL-S-5059 MIL 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.