The Screw,cap,socket Head, cataloged under National Stock Number 5305-01-672-8258, 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 12 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-672-8258 |
| Primary Part Number | 91900A653 |
| Item Name | Screw,cap,socket Head |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Mcmaster-Carr Supply Co |
| Status | ACTIVE |
| Head Height | 0.199 INCHES NOMINAL IN |
| Fastener Length | 1.0 INCHES NOMINAL IN |
| Thread Length | 1.0 INCHES NOMINAL IN |
| Nominal Thread Diameter | 0.375 INCHES IN |
| Head Style | PAN |
| Thread Direction | RIGHT-HAND |
| Internal Drive Style | TORQUE |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 16 |
| Material | STEEL PROPERTY CLASS 18.8 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) |
| Head Diameter | 0.656 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 |
|---|---|
| 91900A653 | Mcmaster-Carr Supply Co (USA) |
| Reference | Meaning |
|---|---|
| 75410 | 3/9 Design control — primary reference Tamperproof Screw Company Inc |
NSN 5305-01-672-8258 is a Screw,cap,socket Head, manufactured by Mcmaster-Carr Supply Co, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-672-8258 has 1 manufacturer part number on file: 91900A653 (Mcmaster-Carr Supply Co).
Key specifications for 91900A653: Head Height: 0.199 INCHES NOMINAL IN; Fastener Length: 1.0 INCHES NOMINAL IN; Thread Length: 1.0 INCHES NOMINAL IN; Nominal Thread Diameter: 0.375 INCHES IN. 12 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.