The Nut,self-Locking,hexagon, cataloged under National Stock Number 5310-00-685-7787, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Esna, Llc. Government technical data includes 15 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 5310-00-685-7787 |
| Primary Part Number | 68-1660-3 |
| Item Name | Nut,self-Locking,hexagon |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Esna, Llc |
| Status | ACTIVE |
| Width Across Flats | 0.183 INCHES MINIMUM AND 0.190 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | MIL-C-5541 MIL SPEC SINGLE TREATMENT RESPONSE NUT |
| Thread Series | UNIFIED NATIONAL COARSE (UNC) |
| Temp Rating | 250.0 FAHRENHEIT NOMINAL DEGF |
| Material Document and Classification | QQ-A-225/3 T3 FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 0.099 INCHES IN |
| Locking Feature | PREVAILING TORQUE WITH NONMETALLIC INSERT |
| Nut Height | 0.100 INCHES MINIMUM AND 0.120 INCHES MAXIMUM IN |
| Surface Treatment | OXIDE FILM NUT |
| Nut Style | HEXAGON |
| Thread Class | 3B |
| Thread Quantity Per Inch | 48 |
| Material | ALUMINUM ALLOY 2011 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 |
|---|---|
| 146-3AAN | Honeywell Intl Inc Defense Avionics Systems (USA) |
| 68-1660-3 PRIMARY | Esna, Llc (USA) |
| Reference | Meaning |
|---|---|
| 68-1660-38 | 5/9 Secondary reference Harvard Industries Inc |
| 57A5A186-3 | 5/9 Secondary reference Naval Air Warfare Center Aircraft Div |
NSN 5310-00-685-7787 is a Nut,self-Locking,hexagon, manufactured by Esna, Llc, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-00-685-7787 has 2 manufacturer part numbers on file: 146-3AAN (Honeywell Intl Inc Defense Avionics Systems), 68-1660-3 (Esna, Llc).
Key specifications for 68-1660-3: Width Across Flats: 0.183 INCHES MINIMUM AND 0.190 INCHES MAXIMUM IN; Surface Treatment Document and Classification: MIL-C-5541 MIL SPEC SINGLE TREATMENT RESPONSE NUT; Thread Series: UNIFIED NATIONAL COARSE (UNC); Temp Rating: 250.0 FAHRENHEIT NOMINAL DEGF. 15 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.