The Screw,cap,socket Head, cataloged under National Stock Number 5305-00-481-4226, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Apollo Aerospace Components Llc. Government technical data includes 21 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-00-481-4226 |
| Primary Part Number | 509441-2052A |
| Item Name | Screw,cap,socket Head |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Apollo Aerospace Components Llc |
| Status | ACTIVE |
| Width Across Flats | 0.875 INCHES NOMINAL IN |
| Head Height | 1.250 INCHES MAXIMUM IN |
| Fastener Length | 6.500 INCHES NOMINAL IN |
| Thread Length | 2.438 INCHES MINIMUM IN |
| Hardness Rating | 36.0 ROCKWELL C MINIMUM AND 43.0 ROCKWELL C MAXIMUM OVERALL |
| Hole Configuration Style | ROUND LONGITUDINAL HOLE |
| Material Document and Classification | MIL-S-5626 MIL SPEC 1ST MATERIAL RESPONSE OR MIL-S-5000 MIL SPEC 2ND MATERIAL RESPONSE OR MIL-S-8503 MIL SPEC 3RD MATERIAL RESPONSE OR MIL-S-6098 MIL SPEC 4TH MATERIAL RESPONSE OR MIL-S-6049 MIL SPEC 5TH MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 1.250 INCHES IN |
| Head Style | FLAT CHAMFER |
| Thread Direction | RIGHT-HAND |
| Minimum Tensile Strength | 160000 POUNDS PER SQUARE INCH LBS |
| Minimum Yield Strength | 130000 POUNDS PER SQUARE INCH LBS |
| Internal Drive Style | HEXAGON |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 12 |
| Material | STEEL COMP 4140 OR STEEL COMP E4340 OR STEEL COMP 6150 OR STEEL COMP 8735 OR STEEL COMP 8740 OVERALL |
| Hole Quantity | 6 |
| Thread Series Designator | UNF |
| Hole Type | DRILLED |
| Hole Diameter | 0.094 INCHES NOMINAL IN |
| Head Diameter | 1.875 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 |
|---|---|
| 509441-2052A | Apollo Aerospace Components Llc (USA) |
| 509441-2052A | Metrican Inc Dba Metrix Manufacturing Company (USA) |
| Reference | Meaning |
|---|---|
| 509441-2052A | 3/2 Design control — primary reference U.S. Government activity |
NSN 5305-00-481-4226 is a Screw,cap,socket Head, manufactured by Apollo Aerospace Components Llc, classified under FSC 5305, Screws. Status: active.
NSN 5305-00-481-4226 has 2 manufacturer part numbers on file: 509441-2052A (Apollo Aerospace Components Llc), 509441-2052A (Metrican Inc Dba Metrix Manufacturing Company).
Key specifications for 509441-2052A: Width Across Flats: 0.875 INCHES NOMINAL IN; Head Height: 1.250 INCHES MAXIMUM IN; Fastener Length: 6.500 INCHES NOMINAL IN; Thread Length: 2.438 INCHES MINIMUM IN. 21 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.