The Screw,shoulder, cataloged under National Stock Number 5305-01-239-5066, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. Government technical data includes 20 specifications, cited from the U.S. Government catalog. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-239-5066 |
| Item Name | Screw,shoulder |
| FSC / FSG | 5305 / 53 — Screws |
| Status | ACTIVE |
| Head Height | 0.240 INCHES NOMINAL IN |
| Fastener Length | 2.320 INCHES NOMINAL IN |
| Shoulder Length | 1.062 INCHES NOMINAL FIRST SHOULDER IN |
| Distance From Centerline to Flat | 0.225 INCHES MINIMUM AND 0.245 INCHES MAXIMUM IN |
| Shoulder Diameter | 0.4430 INCHES MINIMUM AND 0.4435 INCHES MAXIMUM FIRST SHOULDER IN |
| Thread Length | 0.750 INCHES NOMINAL IN |
| Shoulder Shape | ROUND FIRST SHOULDER |
| Hardness Rating | 25.0 ROCKWELL C MINIMUM AND 27.0 ROCKWELL C MAXIMUM OVERALL |
| Material Document and Classification | SAE COND F ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.438 INCHES IN |
| Head Style | DEE CHAMFER |
| Thread Direction | RIGHT-HAND |
| Minimum Tensile Strength | 125000 POUNDS PER SQUARE INCH LBS |
| Minimum Yield Strength | 100000 POUNDS PER SQUARE INCH LBS |
| Internal Drive Style | W/O INTERNAL DRIVE |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 20 |
| Material | STEEL COMP 4130 OVERALL |
| Thread Series Designator | UNF |
| Head Diameter | 0.625 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 |
|---|---|
| 2014 | 3/9 Design control — primary reference U.S. Government activity |
| 2014 | C/1 Advisory reference — outside the item-of-supply concept Gulf Coast Holdings, Inc Dba Unidynamics |
| 2014 | C/1 Advisory reference — outside the item-of-supply concept U.S. Government activity |
NSN 5305-01-239-5066 is a Screw,shoulder, classified under FSC 5305, Screws. Status: active.
Key specifications for 5305-01-239-5066: Head Height: 0.240 INCHES NOMINAL IN; Fastener Length: 2.320 INCHES NOMINAL IN; Shoulder Length: 1.062 INCHES NOMINAL FIRST SHOULDER IN; Distance From Centerline to Flat: 0.225 INCHES MINIMUM AND 0.245 INCHES MAXIMUM IN. 20 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.