The Nut,plain,cap, cataloged under National Stock Number 5310-00-159-6340, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Lockheed Martin Corporation. Government technical data includes 11 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 | 5310-00-159-6340 |
| Primary Part Number | SMB603991-4 |
| Item Name | Nut,plain,cap |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Lockheed Martin Corporation |
| Status | ACTIVE |
| Width Across Flats | 0.375 INCHES NOMINAL IN |
| Thread Series | UNF |
| Material Document and Classification | RESIN ZYTEL 101 FSCM 27280 MFR REF SINGLE MATERIAL RESPONSE OVERALL |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 0.190 INCHES IN |
| Nut Height | 0.281 INCHES NOMINAL IN |
| Nut Style | CAP |
| Thread Class | 2B |
| Thread Quantity Per Inch | 32 |
| Material | PLASTIC POLYAMIDE NYLON OVERALL |
| Bearing Surface Type | FLAT |
| 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 |
|---|---|
| SMB603991-4 PRIMARY | Lockheed Martin Corporation (USA) |
NSN 5310-00-159-6340 is a Nut,plain,cap, manufactured by Lockheed Martin Corporation, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-00-159-6340 has 1 manufacturer part number on file: SMB603991-4 (Lockheed Martin Corporation).
Key specifications for SMB603991-4: Width Across Flats: 0.375 INCHES NOMINAL IN; Thread Series: UNF; Material Document and Classification: RESIN ZYTEL 101 FSCM 27280 MFR REF SINGLE MATERIAL RESPONSE OVERALL; Thread Direction: RIGHT-HAND. 11 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.