The Screw,cap,socket Head, cataloged under National Stock Number 5305-01-446-1336, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Northrop Grumman Systems Corporation. Government technical data includes 15 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-446-1336 |
| Primary Part Number | GS553BW4-12 |
| Item Name | Screw,cap,socket Head |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Northrop Grumman Systems Corporation |
| Status | ACTIVE |
| Width Across Flats | 0.156 INCHES NOMINAL IN |
| Fastener Length | 0.750 INCHES MINIMUM IN |
| Thread Length | 0.720 INCHES NOMINAL IN |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Head Style | FLAT COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Color | BLACK OVERALL |
| Minimum Tensile Strength | 150000 POUNDS PER SQUARE INCH LBS |
| Internal Drive Style | HEXAGON |
| Countersink Angle | 38.0 DEGREES MINIMUM AND 44.0 DEGREES MAXIMUM |
| Thread Class | RC |
| Thread Quantity Per Inch | 20 |
| Material | IRON ALLOY 660 OVERALL |
| Thread Series Designator | UNRC |
| Head Diameter | 0.480 INCHES MINIMUM AND 0.531 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 |
| Part Number | Manufacturer |
|---|---|
| GS553BW4-12 PRIMARY | Northrop Grumman Systems Corporation (USA) |
| 91253A540 | Mcmaster-Carr Supply Co (USA) |
NSN 5305-01-446-1336 is a Screw,cap,socket Head, manufactured by Northrop Grumman Systems Corporation, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-446-1336 has 2 manufacturer part numbers on file: GS553BW4-12 (Northrop Grumman Systems Corporation), 91253A540 (Mcmaster-Carr Supply Co).
Key specifications for GS553BW4-12: Width Across Flats: 0.156 INCHES NOMINAL IN; Fastener Length: 0.750 INCHES MINIMUM IN; Thread Length: 0.720 INCHES NOMINAL IN; Nominal Thread Diameter: 0.250 INCHES IN. 15 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.