The Packing Nut, cataloged under National Stock Number 4730-00-684-0564, is classified within Federal Supply Class 4730 (No Item Name Available) of the Pipe, Tubing, Hose, and Fittings group. The primary manufacturer of record is Sae International Dba Sae International. Government technical data includes 17 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 17 commercial cross-references from 9 manufacturers, enabling identification through both NSN and commercial part number lookups. 4 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Cancelled.
| Parameter | Value |
|---|---|
| NSN | 4730-00-684-0564 |
| Primary Part Number | MS21937W4H |
| Item Name | Packing Nut |
| FSC / FSG | 4730 / 47 — No Item Name Available |
| Manufacturer | Sae International Dba Sae International |
| Status | CANCELLED |
| Thread Size | 7/16IN-20 IN |
| Largest Inside Diameter | 0.875 INCHES NOMINAL IN |
| Screw Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Screw Thread Location | INTERNAL |
| Major Unthreaded Outside Diameter | 1.000 INCHES NOMINAL IN |
| Width Across Flats | 1.000 INCHES NOMINAL IN |
| Length to Shoulder | 0.344 INCHES NOMINAL IN |
| Material | ALUMINUM ALLOY 2014 |
| Surface Treatment | ANODIZE |
| Style Designator | HEXAGON, INTERNAL THREAD, SHOULDERED |
| Surface Treatment Document and Classification | MIL-A-8625,TYPE 2,CLASS 1 MIL SPEC SINGLE TREATMENT RESPONSE |
| Test Data Document | 81349-MIL-F-18280C SPECIFICATION (INCLUDES ENGINEERING TYPE BULLETINS, BROCHURES,ETC., THAT REFLECT SPECIFICATION TYPE DATA IN SPECIFICATION FORMAT; EXCLUDES COMMERCIAL CATALOGS, INDUSTRY DIRECTORIES, AND SIMILAR TRADE PUBLICATIONS, REFLECTING GENERAL TYPE DATA ON CERTAIN ENVIRONMENTAL AND PERFORMANCE REQUIREMENTS AND TEST CONDITIONS THAT ARE SHOWN AS "TYPICAL", "AVERAGE", "NOMINAL", ETC.). |
| Unthreaded Portion Length | 0.156 INCHES NOMINAL IN |
| Thread Direction | RIGHT-HAND |
| Thread Class | 3B |
| Thread Length | 0.344 INCHES NOMINAL IN |
| Casehardening Indicator | NOT CASEHARDENED |
| Acquisition Status | CANCELLED |
| HAZMAT | No |
| Part Number | Manufacturer |
|---|---|
| AS18280 | Society of Automotive Engineers Inc (USA) |
| MS21937-4H | Society of Automotive Engineers Inc (USA) |
| MS21937-4HC | Military Standards Promulgated by Military Departments Under Authority of Defense Standardization Manual 4120 3-M |
| MS21937W4H | Society of Automotive Engineers Inc (USA) |
| SAE-AS18280 | Sae International Dba Sae International (USA) |
| MS21937-4H | Parker Hannifin Corp Stratoflex Div Aircraft Fittings Opn (USA) |
| MS21937W4H PRIMARY | Sae International Dba Sae International (USA) |
| MS21937-4H | Military Standards Promulgated by Military Departments Under Authority of Defense Standardization Manual 4120 3-M |
| MS21937-4H | Faber Enterprises, Inc. Div Faber Enterprise Inc (USA) |
| AS18280 | Sae International Dba Sae International (USA) |
| MS21937-4H | Parker-Hannifin Corporation Dba Pneutronics Div Corporate Headquarters (USA) |
| MS21937-4H | Eaton Aeroquip Llc Dba Jackson North 1 Div Fluid and Electrical Distribution (USA) |
| AS21937 | Society of Automotive Engineers Inc (USA) |
| AS21937 | Sae International Dba Sae International (USA) |
| MS21937-4H | Dana Corp Weatherhead Div (USA) |
| 105-01584 | Dana Corp Weatherhead Div (USA) |
| MS21937-4H | Globe Aerospace Inc (USA) |
NSN 4730-00-684-0564 is a Packing Nut, manufactured by Sae International Dba Sae International, classified under FSC 4730 (No Item Name Available). Status: cancelled.
NSN 4730-00-684-0564 has 17 cross-referenced part numbers: AS18280 (Society of Automotive Engineers Inc), MS21937-4H (Society of Automotive Engineers Inc), MS21937-4HC (Military Standards Promulgated by Military Departments Under Authority of Defense Standardization Manual 4120 3-M), MS21937W4H (Society of Automotive Engineers Inc), SAE-AS18280 (Sae International Dba Sae International) and 12 more.
There are 4 known substitutes for 4730-00-684-0564: 4730-00-222-1912, 4730-00-433-2974, 4730-00-541-2173 and 1 more. Verify interchangeability with system specifications before substitution.
Key specifications for MS21937W4H: Thread Size: 7/16IN-20 IN; Overall Length: 0.500 INCHES NOMINAL IN; Largest Inside Diameter: 0.875 INCHES NOMINAL IN; Screw Thread Series Designator: UNIFIED NATIONAL JOINT FINE (UNJF). 18 total characteristics are documented in the Federal Logistics Information System.
NSN 4730-00-684-0564 is currently cancelled. Check with the Defense Logistics Agency for current availability and authorized substitutes.