The Washer,flat, cataloged under National Stock Number 5310-01-569-0412, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Mack Boring & Parts Co. Government technical data includes 5 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. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-569-0412 |
| Primary Part Number | 87511 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Mack Boring & Parts Co |
| Status | ACTIVE |
| Overall Diameter | 19.5 MILLIMETERS MINIMUM AND 20.0 MILLIMETERS MAXIMUM MM |
| Cross-Sectional Shape Style | RECTANGULAR |
| Peripheral Shape Style | ROUND |
| Center Hole Shape Style | ROUND |
| Hole Diameter | 10.9 MILLIMETERS MINIMUM AND 11.1 MILLIMETERS MAXIMUM MM |
| 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 |
|---|---|
| 87511 PRIMARY | Mack Boring & Parts Co (USA) |
NSN 5310-01-569-0412 is a Washer,flat, manufactured by Mack Boring & Parts Co, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-569-0412 has 1 manufacturer part number on file: 87511 (Mack Boring & Parts Co).
Key specifications for 87511: Overall Diameter: 19.5 MILLIMETERS MINIMUM AND 20.0 MILLIMETERS MAXIMUM MM; Cross-Sectional Shape Style: RECTANGULAR; Special Features: M10; Peripheral Shape Style: ROUND. 5 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.