The Screw,cap,hexagon Head, cataloged under National Stock Number 5305-01-573-6658, 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 11 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 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 | 5305-01-573-6658 |
| Primary Part Number | 91287A303 |
| Item Name | Screw,cap,hexagon Head |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Mcmaster-Carr Supply Co |
| Status | ACTIVE |
| Head Height | 5.3 MILLIMETERS NOMINAL MM |
| Fastener Length | 22.0 MILLIMETERS NOMINAL MM |
| Thread Pitch in Millimeters | 1.2 |
| Thread Length | 22.0 MILLIMETERS NOMINAL MM |
| Nominal Thread Diameter | 8.0 MILLIMETERS MM |
| Head Style | HEXAGON |
| Thread Direction | RIGHT-HAND |
| Width Between Flats | 13.0 MILLIMETERS NOMINAL MM |
| Minimum Tensile Strength | 1000000 POUNDS PER SQUARE INCH LBS |
| Material | STEEL OVERALL |
| Thread Series Designator | M |
| 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 |
|---|---|
| 91287A303 PRIMARY | Mcmaster-Carr Supply Co (USA) |
NSN 5305-01-573-6658 is a Screw,cap,hexagon Head, manufactured by Mcmaster-Carr Supply Co, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-573-6658 has 1 manufacturer part number on file: 91287A303 (Mcmaster-Carr Supply Co).
1 possible match (shared part number, not a government interchangeability claim): 5305-01-648-1132. Verify interchangeability with system specifications before substitution.
Key specifications for 91287A303: Head Height: 5.3 MILLIMETERS NOMINAL MM; Fastener Length: 22.0 MILLIMETERS NOMINAL MM; Thread Pitch in Millimeters: 1.2; Thread Length: 22.0 MILLIMETERS NOMINAL MM. 11 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.