The Setscrew, cataloged under National Stock Number 5305-01-256-5182, is classified within Federal Supply Class 5305 (No Item Name Available) of the Hardware and Abrasives group. The primary manufacturer of record is Mason Electric Co. Dba Mason Controls. Government technical data includes 13 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 2 commercial cross-references from 2 manufacturers, 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 | 5305-01-256-5182 |
| Primary Part Number | PM21220-1 |
| Item Name | Setscrew |
| FSC / FSG | 5305 / 53 — No Item Name Available |
| Manufacturer | Mason Electric Co. Dba Mason Controls |
| Status | ACTIVE |
| Surface Treatment | PASSIVATE OVERALL |
| Thread Direction | RIGHT-HAND |
| Point Style | CONE |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) |
| Fastener Length | 0.250 INCHES NOMINAL IN |
| Material | STEEL COMP 303SE AND STEEL COMP 303 OVERALL |
| Thread Class | 2A A |
| Nominal Thread Diameter | 0.164 INCHES IN |
| Thread Quantity Per Inch | 32 |
| Head Style | HEADLESS (SETSCREW) |
| Internal Drive Style | HEXAGON |
| Material Document and Classification | ASTM A582 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Width Across Flats | 0.078 INCHES NOMINAL IN |
| Acquisition Status | ACTIVE |
| HAZMAT | No |
NSN 5305-01-256-5182 is a Setscrew, manufactured by Mason Electric Co. Dba Mason Controls, classified under FSC 5305 (No Item Name Available). Status: active.
NSN 5305-01-256-5182 has 2 cross-referenced part numbers: PM21220-1 (Unison Industries Llc), PM21220-1 (Mason Electric Co. Dba Mason Controls).
There is 1 known substitute for 5305-01-256-5182: 5305-00-721-4644. Verify interchangeability with system specifications before substitution.
Key specifications for PM21220-1: Surface Treatment: PASSIVATE OVERALL; Thread Direction: RIGHT-HAND; Point Style: CONE; Thread Series Designator: UNIFIED NATIONAL COARSE (UNC). 13 total characteristics are documented in the Federal Logistics Information System.