The Washer,flat, cataloged under National Stock Number 5310-01-087-0304, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Northrop Grumman Systems Corporation Dba Electronic Systems. Government technical data includes 9 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-087-0304 |
| Primary Part Number | 989C639H06 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Northrop Grumman Systems Corporation Dba Electronic Systems |
| Status | ACTIVE |
| Overall Diameter | 0.307 INCHES MINIMUM AND 0.327 INCHES MAXIMUM IN |
| Material Document and Classification | MIL-M-20693 TYPE 1 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Cross-Sectional Shape Style | RECTANGULAR |
| Color | BLACK OVERALL |
| Peripheral Shape Style | ROUND |
| Material | PLASTIC POLYHEXAMETHYLENE AMIDE OVERALL |
| Center Hole Shape Style | ROUND |
| Hole Diameter | 0.150 INCHES MINIMUM AND 0.163 INCHES MAXIMUM IN |
| Thickness | 0.018 INCHES MINIMUM AND 0.022 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 |
|---|---|
| 989C639H06 PRIMARY | Northrop Grumman Systems Corporation Dba Electronic Systems (USA) |
| Reference | Meaning |
|---|---|
| NW6-3122 | 5/9 Secondary reference U.S. Government activity |
| LWNY-006BK | 5/9 Secondary reference U.S. Government activity |
NSN 5310-01-087-0304 is a Washer,flat, manufactured by Northrop Grumman Systems Corporation Dba Electronic Systems, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-087-0304 has 1 manufacturer part number on file: 989C639H06 (Northrop Grumman Systems Corporation Dba Electronic Systems).
Key specifications for 989C639H06: Overall Diameter: 0.307 INCHES MINIMUM AND 0.327 INCHES MAXIMUM IN; Material Document and Classification: MIL-M-20693 TYPE 1 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL; Cross-Sectional Shape Style: RECTANGULAR; Color: BLACK OVERALL. 9 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.