The Setscrew, cataloged under National Stock Number 5305-00-045-1684, is classified within Federal Supply Class 5305 (No Item Name Available) of the Hardware and Abrasives group. The primary manufacturer of record is Military Standards Promulgated by Military Departments Under Authority of Defense Standardization Manual 4120 3-M. Government technical data includes 15 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. 1 verified substitute exists in the FLIS interchangeability database. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-00-045-1684 |
| Primary Part Number | MS51021-9 |
| Item Name | Setscrew |
| FSC / FSG | 5305 / 53 — No Item Name Available |
| Manufacturer | Military Standards Promulgated by Military Departments Under Authority of Defense Standardization Manual 4120 3-M |
| Status | ACTIVE |
| Thread Class | 3A A |
| Width Across Flats | 0.050 INCHES NOMINAL IN |
| Thread Length | 0.125 INCHES MINIMUM IN |
| Thread Quantity Per Inch | 40 |
| Surface Treatment Document and Classification | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Thread Direction | RIGHT-HAND |
| Head Style | HEADLESS (SETSCREW) |
| Hardness Rating | 25.0 ROCKWELL C MINIMUM AND 45.0 ROCKWELL C MAXIMUM OVERALL |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) |
| Internal Drive Style | HEXAGON |
| Material | STEEL COMP 304 OVERALL |
| Point Style | CUP |
| Surface Treatment | PASSIVATE OVERALL |
| Nominal Thread Diameter | 0.112 INCHES IN |
| Fastener Length | 0.125 INCHES NOMINAL IN |
| Acquisition Status | ACTIVE |
| HAZMAT | No |
| Part Number | Manufacturer |
|---|---|
| MS51021-9 | Military Standards Promulgated by Military Departments Under Authority of Defense Standardization Manual 4120 3-M |
NSN 5305-00-045-1684 is a Setscrew, manufactured by Military Standards Promulgated by Military Departments Under Authority of Defense Standardization Manual 4120 3-M, classified under FSC 5305 (No Item Name Available). Status: active.
NSN 5305-00-045-1684 has 1 cross-referenced part number: MS51021-9 (Military Standards Promulgated by Military Departments Under Authority of Defense Standardization Manual 4120 3-M).
There is 1 known substitute for 5305-00-045-1684: 5305-00-800-7261. Verify interchangeability with system specifications before substitution.
Key specifications for MS51021-9: Thread Class: 3A A; Width Across Flats: 0.050 INCHES NOMINAL IN; Thread Length: 0.125 INCHES MINIMUM IN; Thread Quantity Per Inch: 40. 15 total characteristics are documented in the Federal Logistics Information System.