The Screw,machine, cataloged under National Stock Number 5305-01-436-9360, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Long-Lok, Llc. Government technical data includes 15 specifications, cited from the U.S. Government catalog. The record lists 2 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 5305-01-436-9360 |
| Primary Part Number | PL51957-43-1 |
| Item Name | Screw,machine |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Long-Lok, Llc |
| Status | ACTIVE |
| Head Height | 0.053 INCHES MINIMUM AND 0.062 INCHES MAXIMUM IN |
| Locking Feature Material Document and Classification | MIL-F-18240 MIL SPEC SINGLE MATERIAL RESPONSE |
| Screw Surface Treatment | PASSIVATE |
| Fastener Length | 0.375 INCHES NOMINAL IN |
| Screw Material Document and Classification | MS1957 MIL STD SINGLE MATERIAL RESPONSE |
| Thread Length | 0.375 INCHES NOMINAL IN |
| Nominal Thread Diameter | 0.164 INCHES IN |
| Head Style | ROUND |
| Thread Direction | RIGHT-HAND |
| Screw Material | STEEL CORROSION RESISTING |
| Internal Drive Style | CROSS RECESS TYPE II |
| Thread Class | 2A A |
| Thread Quantity Per Inch | 32 |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) |
| Head Diameter | 0.155 INCHES MINIMUM AND 0.167 INCHES MAXIMUM IN |
| 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 |
|---|---|
| S-21298-79 | Nylok Llc (USA) |
| PL51957-43-1 PRIMARY | Long-Lok, Llc (USA) |
| Reference | Meaning |
|---|---|
| 531118-79 | 7/2 Vendor item drawing reference U.S. Government activity |
NSN 5305-01-436-9360 is a Screw,machine, manufactured by Long-Lok, Llc, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-436-9360 has 2 manufacturer part numbers on file: S-21298-79 (Nylok Llc), PL51957-43-1 (Long-Lok, Llc).
Key specifications for PL51957-43-1: Head Height: 0.053 INCHES MINIMUM AND 0.062 INCHES MAXIMUM IN; Locking Feature Material Document and Classification: MIL-F-18240 MIL SPEC SINGLE MATERIAL RESPONSE; Screw Surface Treatment: PASSIVATE; Fastener Length: 0.375 INCHES NOMINAL IN. 15 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.