The Screw,machine, cataloged under National Stock Number 5305-01-621-8243, is classified within Federal Supply Class 5305 (No Item Name Available) of the Hardware and Abrasives group. The primary manufacturer of record is Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M. Government technical data includes 14 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 1 commercial cross-reference from 1 manufacturer, enabling identification through both NSN and commercial part number lookups. 4 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-621-8243 |
| Primary Part Number | MS51957-79 |
| Item Name | Screw,machine |
| FSC / FSG | 5305 / 53 — No Item Name Available |
| Manufacturer | Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M |
| Status | ACTIVE |
| Screw Surface Treatment | PASSIVATE |
| Head Style | PAN |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Head Height | 0.162 INCHES MINIMUM AND 0.175 INCHES MAXIMUM IN |
| Thread Class | 2A A |
| Fastener Length | 0.500 INCHES NOMINAL IN |
| Screw Material | STEEL COMP 302 OR STEEL COMP 304 OR STEEL COMP 305 OR STEEL COMP 316 |
| Head Diameter | 0.473 INCHES MINIMUM AND 0.492 INCHES MAXIMUM IN |
| Minimum Tensile Strength | 80000 POUNDS PER SQUARE INCH LBS |
| Thread Direction | RIGHT-HAND |
| Internal Drive Style | CROSS RECESS TYPE 1 |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) |
| Thread Length | 0.469 INCHES MINIMUM AND 0.500 INCHES MAXIMUM IN |
| Thread Quantity Per Inch | 20 |
| Acquisition Status | ACTIVE |
| HAZMAT | No |
| Part Number | Manufacturer |
|---|---|
| MS51957-79 | Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M |
NSN 5305-01-621-8243 is a Screw,machine, manufactured by Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M, classified under FSC 5305 (No Item Name Available). Status: active.
NSN 5305-01-621-8243 has 1 cross-referenced part number: MS51957-79 (Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M).
There are 4 known substitutes for 5305-01-621-8243: 5305-00-071-1315, 5305-01-406-7434, 5305-01-419-0830 and 1 more. Verify interchangeability with system specifications before substitution.
Key specifications for MS51957-79: Screw Surface Treatment: PASSIVATE; Head Style: PAN; Nominal Thread Diameter: 0.250 INCHES IN; Head Height: 0.162 INCHES MINIMUM AND 0.175 INCHES MAXIMUM IN. 16 total characteristics are documented in the Federal Logistics Information System.