The Nut,self-Locking,hexagon, cataloged under National Stock Number 5310-01-556-0720, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. Government technical data includes 4 specifications, cited from the U.S. Government catalog. 10 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-556-0720 |
| Item Name | Nut,self-Locking,hexagon |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Status | ACTIVE |
| Thread Series | UNIFIED NATIONAL COARSE (UNC) |
| Nominal Thread Size | 0.875 INCHES IN |
| Thread Class | 3B |
| Thread Quantity Per Inch | 9 |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| 751-6402401 FIND NO 64 | 5/1 Secondary reference Naval Sea Systems Command |
| 751-6402405 FIND NO 64 | 5/1 Secondary reference Naval Sea Systems Command |
| MS17828-14CMODTI | 2/2 Government specification standardization U.S. Government activity |
| 211053043 | 5/1 Secondary reference U.S. Government activity |
| 751-6402404 FIND NO 64 | 5/1 Secondary reference Naval Sea Systems Command |
| 751-6402403 FIND NO 64 | 5/1 Secondary reference Naval Sea Systems Command |
| 751-6402402 FIND NO 64 | 5/1 Secondary reference Naval Sea Systems Command |
| 751-6402407 FIND NO 64 | 5/1 Secondary reference Naval Sea Systems Command |
| 751-6402406 FIND NO 64 | 5/1 Secondary reference Naval Sea Systems Command |
| 751-6402408 FIND NO 64 | 5/1 Secondary reference Naval Sea Systems Command |
NSN 5310-01-556-0720 is a Nut,self-Locking,hexagon, classified under FSC 5310, Nuts and Washers. Status: active.
Key specifications for 5310-01-556-0720: Thread Series: UNIFIED NATIONAL COARSE (UNC); Nominal Thread Size: 0.875 INCHES IN; Thread Class: 3B; End Item Identification: TORPEDO TUBE, SUBMERGED, UPR RH, MK69, MOD 1. 4 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.