The Screw,cap,hexagon Head, cataloged under National Stock Number 5305-01-359-8899, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Nylok Llc. Government technical data includes 13 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-359-8899 |
| Primary Part Number | P4ML820-16P |
| Item Name | Screw,cap,hexagon Head |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Nylok Llc |
| Status | ACTIVE |
| Head Height | 0.302 INCHES MINIMUM AND 0.323 INCHES MAXIMUM IN |
| Fastener Length | 0.938 INCHES MINIMUM AND 1.000 INCHES MAXIMUM IN |
| Thread Length | 0.900 INCHES MINIMUM AND 1.000 INCHES MAXIMUM IN |
| Nominal Thread Diameter | 0.500 INCHES IN |
| Head Style | HEXAGON |
| Thread Direction | RIGHT-HAND |
| Width Between Flats | 0.736 INCHES MINIMUM AND 0.750 INCHES MAXIMUM IN |
| Locking Feature | PATCH THREADS |
| Thread Class | 2A A |
| Thread Quantity Per Inch | 20 |
| Material | PLASTIC POLYAMIDE NYLON LOCKING FEATURE |
| Material | NICKEL ALLOY K-500 OR NICKEL ALLOY R-405 OR NICKEL ALLOY 400 OR NICKEL ALLOY 502 FASTENER |
| Thread Series Designator | UNF |
| 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 |
|---|---|
| P4ML820-16P PRIMARY | Nylok Llc (USA) |
| Reference | Meaning |
|---|---|
| 0441B0133-29 | 5/9 Secondary reference Martin Marietta Technologies Inc Sub of Martin Marietta Corp Aero and Naval Systems |
| P4ML820-16P | C/1 Advisory reference — outside the item-of-supply concept Zf Industrieantriebe Witten Gmbh |
| 0441B0133-29 | 7/2 Vendor item drawing reference Lockheed Martin Corporation Div Rms |
NSN 5305-01-359-8899 is a Screw,cap,hexagon Head, manufactured by Nylok Llc, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-359-8899 has 1 manufacturer part number on file: P4ML820-16P (Nylok Llc).
Key specifications for P4ML820-16P: Head Height: 0.302 INCHES MINIMUM AND 0.323 INCHES MAXIMUM IN; Fastener Length: 0.938 INCHES MINIMUM AND 1.000 INCHES MAXIMUM IN; Thread Length: 0.900 INCHES MINIMUM AND 1.000 INCHES MAXIMUM IN; Nominal Thread Diameter: 0.500 INCHES IN. 13 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.