The Nut,plain,hexagon, cataloged under National Stock Number 5310-00-199-6519, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Falls Filtration Technologies, Inc.. Government technical data includes 13 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 5310-00-199-6519 |
| Primary Part Number | 20720C |
| Item Name | Nut,plain,hexagon |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Falls Filtration Technologies, Inc. |
| Status | ACTIVE |
| Width Across Flats | 0.423 INCHES MINIMUM AND 0.437 INCHES MAXIMUM IN |
| Thread Series | UNF |
| Material Document and Classification | QQ-B-626,COMP 1 FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 0.250 INCHES IN |
| Departure From Cited Designator | AS MODIFIED BY MATERIAL |
| Nondefinitive Spec/std Data | 2 TYPE AND 13 STYLE |
| Nut Height | 0.178 INCHES MINIMUM AND 0.193 INCHES MAXIMUM IN |
| Nut Style | HEXAGON |
| Thread Class | 2B |
| Thread Quantity Per Inch | 28 |
| Material | COPPER ALLOY OVERALL |
| Bearing Surface Type | CHAMFERED OR WASHER FACED |
| 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 |
|---|---|
| 20720C PRIMARY | Falls Filtration Technologies, Inc. (USA) |
| Reference | Meaning |
|---|---|
| FFN836 | 4/1 Identification reference U.S. Government activity |
NSN 5310-00-199-6519 is a Nut,plain,hexagon, manufactured by Falls Filtration Technologies, Inc., classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-00-199-6519 has 1 manufacturer part number on file: 20720C (Falls Filtration Technologies, Inc.).
Key specifications for 20720C: Width Across Flats: 0.423 INCHES MINIMUM AND 0.437 INCHES MAXIMUM IN; Thread Series: UNF; Material Document and Classification: QQ-B-626,COMP 1 FED SPEC SINGLE MATERIAL RESPONSE OVERALL; Thread Direction: RIGHT-HAND. 13 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.