The Screw,cap,socket Head, cataloged under National Stock Number 5305-01-656-4637, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Fastenal Company. Government technical data includes 8 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 | 5305-01-656-4637 |
| Primary Part Number | 73900 |
| Item Name | Screw,cap,socket Head |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Fastenal Company |
| Status | ACTIVE |
| Fastener Length | 1.500 INCHES NOMINAL IN |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Head Style | FLAT COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Internal Drive Style | HEXAGON |
| Thread Quantity Per Inch | 28 |
| Material | STEEL PROPERTY CLASS 18.8 OVERALL |
| 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 |
|---|---|
| 73900 PRIMARY | Fastenal Company (USA) |
NSN 5305-01-656-4637 is a Screw,cap,socket Head, manufactured by Fastenal Company, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-656-4637 has 1 manufacturer part number on file: 73900 (Fastenal Company).
1 possible match (shared part number, not a government interchangeability claim): 4010-01-668-2714. Verify interchangeability with system specifications before substitution.
Key specifications for 73900: Fastener Length: 1.500 INCHES NOMINAL IN; Nominal Thread Diameter: 0.250 INCHES IN; Head Style: FLAT COUNTERSUNK; Thread Direction: RIGHT-HAND. 8 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.