The Screw,cap,socket Head, cataloged under National Stock Number 5305-01-418-5918, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. Government technical data includes 16 specifications, cited from the U.S. Government catalog. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 4 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-418-5918 |
| Item Name | Screw,cap,socket Head |
| FSC / FSG | 5305 / 53 — Screws |
| Status | ACTIVE |
| Width Across Flats | 0.312 INCHES NOMINAL IN |
| Fastener Length | 2.250 INCHES NOMINAL IN |
| Surface Treatment Document and Classification | QQ-P-416 TII C3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Thread Length | 2.250 INCHES NOMINAL IN |
| Nominal Thread Diameter | 0.500 INCHES IN |
| Head Style | FLAT COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Nondefinitive Spec/std Data | 4 TYPE |
| Surface Treatment | CADMIUM OVERALL |
| Internal Drive Style | HEXAGON |
| Countersink Angle | 82.0 DEGREES NOMINAL |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 20 |
| Material | STEEL UNS K03104 OVERALL |
| Thread Series Designator | UNF |
| Head Diameter | 0.938 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 |
| Reference | Meaning |
|---|---|
| FF-S-86E | 4/1 Identification reference U.S. Government activity |
| COML | 3/2 Design control — primary reference U.S. Government activity |
| 5305PL1440535 | 6/9 Informative reference only Jednolity Indeks Materialowy - Uniform Material Index |
NSN 5305-01-418-5918 is a Screw,cap,socket Head, classified under FSC 5305, Screws. Status: active.
4 possible matches (shared part number, not a government interchangeability claim): 4820-01-536-4811, 5975-01-666-6029, 5305-01-672-8985. Verify interchangeability with system specifications before substitution.
Key specifications for 5305-01-418-5918: Width Across Flats: 0.312 INCHES NOMINAL IN; Fastener Length: 2.250 INCHES NOMINAL IN; Surface Treatment Document and Classification: QQ-P-416 TII C3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL; Thread Length: 2.250 INCHES NOMINAL IN. 16 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.