The Screw,cap,socket Head, cataloged under National Stock Number 5305-01-264-1638, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. Government technical data includes 14 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-264-1638 |
| Item Name | Screw,cap,socket Head |
| FSC / FSG | 5305 / 53 — Screws |
| Status | ACTIVE |
| Width Across Flats | 1.000 INCHES NOMINAL IN |
| Head Height | 1.485 INCHES MINIMUM AND 1.500 INCHES MAXIMUM IN |
| Fastener Length | 4.860 INCHES MINIMUM AND 5.000 INCHES MAXIMUM IN |
| Thread Length | 3.750 INCHES MINIMUM IN |
| Material Document and Classification | ASTM A193 GR B7 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 1.500 INCHES IN |
| Head Style | FLAT CHAMFER |
| Thread Direction | RIGHT-HAND |
| Internal Drive Style | HEXAGON |
| Thread Class | 2A A |
| Thread Quantity Per Inch | 8 |
| Material | STEEL COMP 4140 OR STEEL COMP 4142 OR STEEL COMP 4145 OVERALL |
| Thread Series Designator | UN |
| Head Diameter | 2.224 INCHES MINIMUM AND 2.250 INCHES MAXIMUM 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 |
|---|---|
| 8712A04 | 3/9 Design control — primary reference Cbs Broadcasting Inc. Dba Cbs Div Bechtel Plant Machinery Inc. - Pittsburgh |
NSN 5305-01-264-1638 is a Screw,cap,socket Head, classified under FSC 5305, Screws. Status: active.
Key specifications for 5305-01-264-1638: Width Across Flats: 1.000 INCHES NOMINAL IN; Head Height: 1.485 INCHES MINIMUM AND 1.500 INCHES MAXIMUM IN; Fastener Length: 4.860 INCHES MINIMUM AND 5.000 INCHES MAXIMUM IN; Thread Length: 3.750 INCHES MINIMUM IN. 14 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.