The Nut,plain,round, cataloged under National Stock Number 5310-01-705-8211, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Charles Reed Knight Jr Dba Knight's Armament Company. 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 | 5310-01-705-8211 |
| Primary Part Number | 31661 |
| Item Name | Nut,plain,round |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Charles Reed Knight Jr Dba Knight's Armament Company |
| Status | ACTIVE |
| 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 |
|---|---|
| 31661 PRIMARY | Charles Reed Knight Jr Dba Knight's Armament Company (USA) |
NSN 5310-01-705-8211 is a Nut,plain,round, manufactured by Charles Reed Knight Jr Dba Knight's Armament Company, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-705-8211 has 1 manufacturer part number on file: 31661 (Charles Reed Knight Jr Dba Knight's Armament Company).
Key specifications for 31661: Special Features: LOWER RECEIVER ASSY.; Part Name Assigned by Controlling Agency: LOCK NUT; End Item Identification: SR-16, MOD 2.2. 0 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.