The Screw,cap,socket Head, cataloged under National Stock Number 5305-00-274-2291, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier. Government technical data includes 18 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 5305-00-274-2291 |
| Primary Part Number | 12Z57PC571 |
| Item Name | Screw,cap,socket Head |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier |
| Status | ACTIVE |
| Width Across Flats | 0.562 INCHES MINIMUM AND 0.565 INCHES MAXIMUM IN |
| Head Height | 0.741 INCHES MINIMUM AND 0.750 INCHES MAXIMUM IN |
| Fastener Length | 1.625 INCHES NOMINAL IN |
| Thread Length | 1.625 INCHES NOMINAL IN |
| Hardness Rating | 36.0 ROCKWELL C MINIMUM AND 43.0 ROCKWELL C MAXIMUM OVERALL |
| Material Document and Classification | QQ-S-624 FED SPEC ALL MATERIAL RESPONSES OVERALL |
| Nominal Thread Diameter | 0.750 INCHES IN |
| Head Style | FLAT CHAMFER |
| Thread Direction | RIGHT-HAND |
| Nondefinitive Spec/std Data | 1 TYPE AND 2 STYLE |
| Surface Treatment | ZINC OVERALL |
| Minimum Yield Strength | 140000 POUNDS PER SQUARE INCH LBS |
| Internal Drive Style | HEXAGON |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 16 |
| Material | STEEL COMP 4137 OR STEEL COMP 8640 OVERALL |
| Thread Series Designator | UNF |
| Head Diameter | 0.987 INCHES MINIMUM AND 1.000 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 |
|---|---|
| 12Z57PC571 PRIMARY | Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier (USA) |
| Reference | Meaning |
|---|---|
| FFS86TYPE1STYLE11 | 4/1 Identification reference U.S. Government activity |
NSN 5305-00-274-2291 is a Screw,cap,socket Head, manufactured by Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier, classified under FSC 5305, Screws. Status: active.
NSN 5305-00-274-2291 has 1 manufacturer part number on file: 12Z57PC571 (Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier).
Key specifications for 12Z57PC571: Width Across Flats: 0.562 INCHES MINIMUM AND 0.565 INCHES MAXIMUM IN; Head Height: 0.741 INCHES MINIMUM AND 0.750 INCHES MAXIMUM IN; Fastener Length: 1.625 INCHES NOMINAL IN; Thread Length: 1.625 INCHES NOMINAL IN. 18 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.