The Nut,plain,hexagon, cataloged under National Stock Number 5310-01-568-8501, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Hydraulics International, Inc. Dba Hydraulics International Inc. Government technical data includes 8 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 | 5310-01-568-8501 |
| Primary Part Number | 3305AS1721-1 |
| Item Name | Nut,plain,hexagon |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Hydraulics International, Inc. Dba Hydraulics International Inc |
| Status | ACTIVE |
| Width Across Flats | 0.625 INCHES NOMINAL IN |
| Surface Treatment Document and Classification | MIL-STD-130 MIL STD ALL TREATMENT RESPONSES OVERALL |
| Material Document and Classification | ASTM-A-278 ASSN STD ALL MATERIAL RESPONSES OVERALL |
| Thread Direction | RIGHT-HAND |
| Nut Height | 0.250 INCHES NOMINAL IN |
| Surface Treatment | PASSIVATE OVERALL |
| Nut Style | HEXAGON |
| Material | STEEL OVERALL |
| 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 |
|---|---|
| 3305AS1721-1 PRIMARY | Hydraulics International, Inc. Dba Hydraulics International Inc (USA) |
NSN 5310-01-568-8501 is a Nut,plain,hexagon, manufactured by Hydraulics International, Inc. Dba Hydraulics International Inc, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-568-8501 has 1 manufacturer part number on file: 3305AS1721-1 (Hydraulics International, Inc. Dba Hydraulics International Inc).
Key specifications for 3305AS1721-1: Width Across Flats: 0.625 INCHES NOMINAL IN; Surface Treatment Document and Classification: MIL-STD-130 MIL STD ALL TREATMENT RESPONSES OVERALL; Material Document and Classification: ASTM-A-278 ASSN STD ALL MATERIAL RESPONSES OVERALL; Thread Direction: RIGHT-HAND. 8 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.