The Screw,cap,socket Head, cataloged under National Stock Number 5305-01-680-4259, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Mcmaster-Carr Supply Co. 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. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-680-4259 |
| Primary Part Number | 90665A188 |
| Item Name | Screw,cap,socket Head |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Mcmaster-Carr Supply Co |
| Status | ACTIVE |
| Head Inside Diameter | 0.1875 INCHES NOMINAL IN |
| Head Height | 0.1875 INCHES NOMINAL IN |
| Thread Length | 1.50 INCHES NOMINAL IN |
| Hardness Rating | 39.0 ROCKWELL C NOMINAL OVERALL |
| Material Document and Classification | ASTM A574 AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM) SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.375 INCHES IN |
| Thread Direction | RIGHT-HAND |
| Surface Treatment | ZINC OVERALL |
| Internal Drive Style | HEXAGON |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 16 |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) |
| Head Diameter | 0.562 INCHES NOMINAL 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 |
|---|---|
| 90665A188 PRIMARY | Mcmaster-Carr Supply Co (USA) |
NSN 5305-01-680-4259 is a Screw,cap,socket Head, manufactured by Mcmaster-Carr Supply Co, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-680-4259 has 1 manufacturer part number on file: 90665A188 (Mcmaster-Carr Supply Co).
Key specifications for 90665A188: Head Inside Diameter: 0.1875 INCHES NOMINAL IN; Head Height: 0.1875 INCHES NOMINAL IN; Thread Length: 1.50 INCHES NOMINAL IN; Hardness Rating: 39.0 ROCKWELL C NOMINAL OVERALL. 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.