The Nut,plain,round, cataloged under National Stock Number 5310-01-020-6440, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Machine Specialties, Llc. Government technical data includes 20 specifications, cited from the U.S. Government catalog. The record lists 5 manufacturer part numbers 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 5310-01-020-6440 |
| Primary Part Number | 60-6681-2 |
| Item Name | Nut,plain,round |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Machine Specialties, Llc |
| Status | ACTIVE |
| Thread Series | UN |
| Criticality Code Justification | AGAV |
| Hole Configuration Style | CONFIGURATION F |
| Material Document and Classification | MIL-T-6736 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Drive Point Width | 0.310 INCHES NOMINAL IN |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 4.750 INCHES IN |
| Nut Diameter | 5.500 INCHES NOMINAL IN |
| Drive Point Depth | 0.750 INCHES NOMINAL IN |
| Undercut Thickness | 0.920 INCHES NOMINAL IN |
| Nut Thickness | 1.100 INCHES NOMINAL IN |
| Small End Diameter | 4.973 INCHES NOMINAL IN |
| Drilled Hole Diameter | 0.295 INCHES NOMINAL IN |
| Countersink Angle | 90.0 DEGREES NOMINAL NUT |
| Drive Point Quantity | 4 |
| Nut Style | ROUND |
| Thread Class | 2B |
| Thread Quantity Per Inch | 12 |
| Material | STEEL COMP 4130 OVERALL |
| Hole Type and Quantity | 6 DRILLED |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | F |
| Part Number | Manufacturer |
|---|---|
| 60-6681-2 | Machine Specialties, Llc (USA) |
| 60-6681-2 | Heroux-Devtek Inc (CAN) |
| 60-6681-2 | Hdi Landing Gear Usa Inc (USA) |
| 60-6681-2 | Cm Manufacturing Inc Dba Cm Manufacturing Inc (USA) |
| 60-6681-2 | Johnson Manufacturing, Inc. Dba Johnson Manufacturing (USA) |
| Reference | Meaning |
|---|---|
| 60-6681-2 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5310-01-020-6440 is a Nut,plain,round, manufactured by Machine Specialties, Llc, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-020-6440 has 5 manufacturer part numbers on file: 60-6681-2 (Machine Specialties, Llc), 60-6681-2 (Heroux-Devtek Inc), 60-6681-2 (Hdi Landing Gear Usa Inc), 60-6681-2 (Cm Manufacturing Inc Dba Cm Manufacturing Inc), 60-6681-2 (Johnson Manufacturing, Inc. Dba Johnson Manufacturing).
Key specifications for 60-6681-2: Thread Series: UN; Criticality Code Justification: AGAV; Hole Configuration Style: CONFIGURATION F; Material Document and Classification: MIL-T-6736 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL. 20 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.