The Setscrew, cataloged under National Stock Number 5305-00-817-6139, is classified within Federal Supply Class 5305 (No Item Name Available) of the Hardware and Abrasives group. The primary manufacturer of record is National Aerospace Standards Committee Aerospace Industries Association of America Inc Not for Rfq or Solicitation Use. Government technical data includes 16 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 10 commercial cross-references from 9 manufacturers, enabling identification through both NSN and commercial part number lookups. 11 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Cancelled.
| Parameter | Value |
|---|---|
| NSN | 5305-00-817-6139 |
| Primary Part Number | MS51021-56 |
| Item Name | Setscrew |
| FSC / FSG | 5305 / 53 — No Item Name Available |
| Manufacturer | National Aerospace Standards Committee Aerospace Industries Association of America Inc Not for Rfq or Solicitation Use |
| Status | CANCELLED |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Thread Quantity Per Inch | 20 |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) |
| Surface Treatment Document and Classification | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Material | STEEL COMP 302 OR STEEL COMP 303 OR STEEL COMP 304 OR STEEL COMP 316 OVERALL |
| Material Document and Classification | 66 FED STD ALL MATERIAL RESPONSES OVERALL |
| Surface Treatment | PASSIVATE OVERALL |
| Nondefinitive Spec/std Data | 1 TYPE AND 4 STYLE |
| Width Across Flats | 0.125 INCHES NOMINAL IN |
| Internal Drive Style | HEXAGON |
| Head Style | HEADLESS (SETSCREW) |
| Fastener Length | 0.250 INCHES NOMINAL IN |
| Point Style | CUP |
| Thread Direction | RIGHT-HAND |
| Thread Class | 3A A |
| Thread Length | 0.250 INCHES MAXIMUM IN |
| Acquisition Status | CANCELLED |
| HAZMAT | No |
| Part Number | Manufacturer |
|---|---|
| 20-140C4 | Hf Group Inc Dba Hf Group Inc (USA) |
| 003-07941-056 | Northrop Grumman Systems Corporation Dba Northrop Grumman Systems Corp Div Multiple (USA) |
| MS51021-56 | Military Standards Promulgated by Military Departments Under Authority of Defense Standardization Manual 4120 3-M |
| MS51021-56 PRIMARY | National Aerospace Standards Committee Aerospace Industries Association of America Inc Not for Rfq or Solicitation Use (USA) |
| H81-1/4-20 X 4 | Flowserve Corp Dba Automax Actuators Div Flowserve Us Company (USA) |
| FF-S-200 | Federal Specifications Promulgated by General Services Administration Washington DC (USA) |
| 01-435-0403-4 ITEM 143 | Flowserve Corp Dba Automax Actuators Div Flowserve Us Company (USA) |
| 6634436-001 | Naval Sea Systems Command (USA) |
| 83-44 | Cnh Industrial America Llc Dba Cnh America (USA) |
| 5305PL1336637 | Jednolity Indeks Materialowy - Uniform Material Index (POL) |
NSN 5305-00-817-6139 is a Setscrew, manufactured by National Aerospace Standards Committee Aerospace Industries Association of America Inc Not for Rfq or Solicitation Use, classified under FSC 5305 (No Item Name Available). Status: cancelled.
NSN 5305-00-817-6139 has 10 cross-referenced part numbers: 20-140C4 (Hf Group Inc Dba Hf Group Inc), 003-07941-056 (Northrop Grumman Systems Corporation Dba Northrop Grumman Systems Corp Div Multiple), MS51021-56 (Military Standards Promulgated by Military Departments Under Authority of Defense Standardization Manual 4120 3-M), MS51021-56 (National Aerospace Standards Committee Aerospace Industries Association of America Inc Not for Rfq or Solicitation Use), H81-1/4-20 X 4 (Flowserve Corp Dba Automax Actuators Div Flowserve Us Company) and 5 more.
There are 11 known substitutes for 5305-00-817-6139: 5331-00-171-8266, 5305-00-484-6978, 4720-00-580-7470 and 8 more. Verify interchangeability with system specifications before substitution.
Key specifications for MS51021-56: Nominal Thread Diameter: 0.250 INCHES IN; Thread Quantity Per Inch: 20; Thread Series Designator: UNIFIED NATIONAL COARSE (UNC); Surface Treatment Document and Classification: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL. 16 total characteristics are documented in the Federal Logistics Information System.
NSN 5305-00-817-6139 is currently cancelled. Check with the Defense Logistics Agency for current availability and authorized substitutes.