The Washer,flat, cataloged under National Stock Number 5310-01-617-9868, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Mainstream Engineering Corp. 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 5310-01-617-9868 |
| Primary Part Number | 10-52928-19 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Mainstream Engineering Corp |
| Status | ACTIVE |
| Overall Diameter | 3.250 INCHES NOMINAL IN |
| Hardness Rating | 40.00 ROCKWELL A NOMINAL |
| Material Document and Classification | MIL-STD-130 MIL STD 1ST MATERIAL RESPONSE OVERALL |
| Cross-Sectional Shape Style | RECTANGULAR |
| Surface Treatment | ZINC OVERALL |
| Peripheral Shape Style | ROUND |
| Material | STEEL OVERALL |
| Center Hole Shape Style | ROUND |
| Hole Diameter | 0.937 INCHES NOMINAL IN |
| Thickness | 0.110 INCHES MINIMUM AND 0.140 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 |
|---|---|
| 10-52928-19 PRIMARY | Mainstream Engineering Corp (USA) |
| Reference | Meaning |
|---|---|
| 91117A245 | 7/2 Vendor item drawing reference Mcmaster-Carr Supply Co |
NSN 5310-01-617-9868 is a Washer,flat, manufactured by Mainstream Engineering Corp, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-617-9868 has 1 manufacturer part number on file: 10-52928-19 (Mainstream Engineering Corp).
Key specifications for 10-52928-19: Overall Diameter: 3.250 INCHES NOMINAL IN; Hardness Rating: 40.00 ROCKWELL A NOMINAL; Material Document and Classification: MIL-STD-130 MIL STD 1ST 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.