The Screw,machine, cataloged under National Stock Number 5305-01-431-7598, 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 19 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-431-7598 |
| Primary Part Number | A3140087-21 |
| Item Name | Screw,machine |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Nylok Llc |
| Status | ACTIVE |
| External Thread Tolerance Class | 6G G |
| Locking Feature Material Document and Classification | L-P-410 MIL SPEC SINGLE MATERIAL RESPONSE |
| Screw Surface Treatment | PASSIVATE |
| Fastener Length | 25.0 MILLIMETERS NOMINAL MM |
| Screw Material Document and Classification | QQ-S-763 MIL SPEC SINGLE MATERIAL RESPONSE AND FED-STD-66 MIL SPEC SINGLE MATERIAL RESPONSE |
| Thread Pitch in Millimeters | 0.7 |
| Thread Length | 4.50 MILLIMETERS MINIMUM AND 5.00 MILLIMETERS MAXIMUM MM |
| Locking Feature Material | PLASTIC POLYAMIDE NYLON |
| Nominal Thread Diameter | 2.5 MILLIMETERS MM |
| Head Style | FLAT COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Locking Feature | PATCH |
| Screw Material | STEEL COMP 301 |
| Minimum Tensile Strength | 80000 POUNDS PER SQUARE INCH LBS |
| Internal Drive Style | CROSS RECESS TYPE II |
| Countersink Angle | 90.0 DEGREES MINIMUM AND 92.0 DEGREES MAXIMUM |
| Thread Series Designator | M |
| Head Diameter | 4.90 MILLIMETERS MINIMUM AND 5.50 MILLIMETERS MAXIMUM MM |
| Screw Surface Treatment Document and Classification | QQ-P-35 MIL SPEC SINGLE TREATMENT RESPONSE |
| 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 |
|---|---|
| A3140087-21 | Nylok Llc (USA) |
| Reference | Meaning |
|---|---|
| A3140087-21 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5305-01-431-7598 is a Screw,machine, manufactured by Nylok Llc, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-431-7598 has 1 manufacturer part number on file: A3140087-21 (Nylok Llc).
1 possible match (shared part number, not a government interchangeability claim): 5305-01-449-7363. Verify interchangeability with system specifications before substitution.
Key specifications for A3140087-21: External Thread Tolerance Class: 6G G; Locking Feature Material Document and Classification: L-P-410 MIL SPEC SINGLE MATERIAL RESPONSE; Screw Surface Treatment: PASSIVATE; Fastener Length: 25.0 MILLIMETERS NOMINAL MM. 19 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.