The Washer,flat, cataloged under National Stock Number 5310-00-027-3497, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Avionics Specialties, 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 6 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-00-027-3497 |
| Primary Part Number | 123-28 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Avionics Specialties, Inc. |
| Status | ACTIVE |
| Surface Treatment Document and Classification | MIL-A-8625 TYPE 1,CLASS 1 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Overall Diameter | 0.630 INCHES MINIMUM AND 0.633 INCHES MAXIMUM IN |
| Material Document and Classification | QQ-A-225/6 T4 FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Cross-Sectional Shape Style | RECTANGULAR |
| Surface Treatment | ANODIZE OVERALL |
| Peripheral Shape Style | ROUND |
| Material | ALUMINUM ALLOY 2024 OVERALL |
| Center Hole Shape Style | ROUND |
| Hole Diameter | 0.375 INCHES MINIMUM AND 0.379 INCHES MAXIMUM IN |
| Thickness | 0.061 INCHES MINIMUM AND 0.066 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 |
|---|---|
| 123-28 PRIMARY | Avionics Specialties, Inc. (USA) |
| Reference | Meaning |
|---|---|
| 10116500 | 6/9 Informative reference only Nimikkeistokeskus Ncb Finland |
NSN 5310-00-027-3497 is a Washer,flat, manufactured by Avionics Specialties, Inc., classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-00-027-3497 has 1 manufacturer part number on file: 123-28 (Avionics Specialties, Inc.).
6 possible matches (shared part number, not a government interchangeability claim): 5330-00-868-7572, 5120-00-935-7451, 4730-01-421-2553. Verify interchangeability with system specifications before substitution.
Key specifications for 123-28: Surface Treatment Document and Classification: MIL-A-8625 TYPE 1,CLASS 1 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL; Overall Diameter: 0.630 INCHES MINIMUM AND 0.633 INCHES MAXIMUM IN; Material Document and Classification: QQ-A-225/6 T4 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.