The Nut,plain,round, cataloged under National Stock Number 5310-00-618-3136, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Nammo Defense Systems Inc. Dba Nammo Defense Systems Inc. Government technical data includes 18 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 | 5310-00-618-3136 |
| Primary Part Number | 4320 |
| Item Name | Nut,plain,round |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Nammo Defense Systems Inc. Dba Nammo Defense Systems Inc |
| Status | ACTIVE |
| Surface Treatment Document and Classification | QQ-P-416,TYPE 2,CLASS 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Thread Series | UNF |
| Hardness Rating | 32.0 ROCKWELL C MINIMUM AND 36.0 ROCKWELL C MAXIMUM |
| Material Document and Classification | AMS 6381 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Drive Point Width | 0.438 INCHES NOMINAL IN |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 0.375 INCHES IN |
| Nut Diameter | 10.470 INCHES MINIMUM AND 10.490 INCHES MAXIMUM IN |
| Drive Point Depth | 0.188 INCHES NOMINAL IN |
| Undercut Thickness | 1.178 INCHES MINIMUM AND 1.198 INCHES MAXIMUM IN |
| Nut Thickness | 2.990 INCHES MINIMUM AND 3.010 INCHES MAXIMUM IN |
| Small End Diameter | 8.490 INCHES MINIMUM AND 8.500 INCHES MAXIMUM IN |
| Surface Treatment | CADMIUM OVERALL |
| Drive Point Quantity | 4 |
| Nut Style | ROUND |
| Thread Class | 3B |
| Thread Quantity Per Inch | 24 |
| 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 |
|---|---|
| 4320 PRIMARY | Nammo Defense Systems Inc. Dba Nammo Defense Systems Inc (USA) |
NSN 5310-00-618-3136 is a Nut,plain,round, manufactured by Nammo Defense Systems Inc. Dba Nammo Defense Systems Inc, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-00-618-3136 has 1 manufacturer part number on file: 4320 (Nammo Defense Systems Inc. Dba Nammo Defense Systems Inc).
Key specifications for 4320: Surface Treatment Document and Classification: QQ-P-416,TYPE 2,CLASS 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL; Thread Series: UNF; Hardness Rating: 32.0 ROCKWELL C MINIMUM AND 36.0 ROCKWELL C MAXIMUM; Material Document and Classification: AMS 6381 ASSN STD SINGLE MATERIAL RESPONSE OVERALL. 18 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.