The Packing Nut, cataloged under National Stock Number 4730-00-821-0189, 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 15 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 18 commercial cross-references from 14 manufacturers, enabling identification through both NSN and commercial part number lookups. 3 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Cancelled.
| Parameter | Value |
|---|---|
| NSN | 4730-00-821-0189 |
| Primary Part Number | MS21937-4L |
| Item Name | Packing Nut |
| FSC / FSG | 4730 / 47 — No Item Name Available |
| Manufacturer | Sae International Dba Sae International |
| Status | CANCELLED |
| Thread Direction | RIGHT-HAND |
| Screw Thread Location | INTERNAL |
| Specification/standard Data | 81343-SAE AS21937 MANUFACTURERS STANDARD |
| Width Across Flats | 1.000 INCHES NOMINAL IN |
| Major Unthreaded Outside Diameter | 0.687 INCHES NOMINAL IN |
| Style Designator | HEXAGON, INTERNAL THREAD, SHOULDERED |
| Length to Shoulder | 0.344 INCHES NOMINAL IN |
| Material | ALUMINUM ALLOY 7075 |
| Thread Length | 0.250 INCHES NOMINAL IN |
| Screw Thread Series Designator | UNF |
| Thread Size | 7/16IN-20 IN |
| Largest Inside Diameter | 0.562 INCHES NOMINAL IN |
| Unthreaded Portion Length | 0.156 INCHES NOMINAL IN |
| Casehardening Indicator | NOT CASEHARDENED |
| Thread Class | 3B |
| Acquisition Status | CANCELLED |
| HAZMAT | No |
| Part Number | Manufacturer |
|---|---|
| AS18280 | Sae International Dba Sae International (USA) |
| MS21937-4L | Chicago Pneumatic Tool Co (USA) |
| AS21937 | Sae International Dba Sae International (USA) |
| MS21937-4L | Parker Hannifin Corp Stratoflex Div Aircraft Fittings Opn (USA) |
| MS21937-4L | Military Standards Promulgated by Military Departments Under Authority of Defense Standardization Manual 4120 3-M |
| MS21937-4L | Eaton Aeroquip Llc Dba Jackson North 1 Div Fluid and Electrical Distribution (USA) |
| MS21937-4L | Collins Engineering Corp (USA) |
| AS18280 | Society of Automotive Engineers Inc (USA) |
| AS21937 | Society of Automotive Engineers Inc (USA) |
| MS21937-4L | Parker-Hannifin Corporation Dba Pneutronics Div Corporate Headquarters (USA) |
| MS21937-4L | Danfoss Power Solutions II, Llc (USA) |
| SAE-AS18280 | Sae International Dba Sae International (USA) |
| MS21937-4L PRIMARY | Sae International Dba Sae International (USA) |
| MS21937-4L | Faber Enterprises, Inc. Div Faber Enterprise Inc (USA) |
| MS21937-4L | Satair A/s (DNK) |
| MS21937-4L | Safran Aerosystems Ex Safran Aerotechnics Rlm (FRA) |
| MS21937-4L | Globe Aerospace Inc (USA) |
| 105-01495 | Dana Corp Weatherhead Div (USA) |
NSN 4730-00-821-0189 is a Packing Nut, manufactured by Sae International Dba Sae International, classified under FSC 4730 (No Item Name Available). Status: cancelled.
NSN 4730-00-821-0189 has 18 cross-referenced part numbers: AS18280 (Sae International Dba Sae International), MS21937-4L (Chicago Pneumatic Tool Co), AS21937 (Sae International Dba Sae International), MS21937-4L (Parker Hannifin Corp Stratoflex Div Aircraft Fittings Opn), MS21937-4L (Military Standards Promulgated by Military Departments Under Authority of Defense Standardization Manual 4120 3-M) and 13 more.
There are 3 known substitutes for 4730-00-821-0189: 4730-00-433-2974, 4730-00-541-2173, 4730-00-684-0564. Verify interchangeability with system specifications before substitution.
Key specifications for MS21937-4L: Thread Direction: RIGHT-HAND; Screw Thread Location: INTERNAL; Specification/standard Data: 81343-SAE AS21937 MANUFACTURERS STANDARD; Width Across Flats: 1.000 INCHES NOMINAL IN. 16 total characteristics are documented in the Federal Logistics Information System.
NSN 4730-00-821-0189 is currently cancelled. Check with the Defense Logistics Agency for current availability and authorized substitutes.