The Packing Nut, cataloged under National Stock Number 4730-00-433-2974, 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 Precision Form Rivet Inc. Government technical data includes 15 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 12 commercial cross-references from 6 manufacturers, enabling identification through both NSN and commercial part number lookups. 3 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4730-00-433-2974 |
| Primary Part Number | MS21937-5H |
| Item Name | Packing Nut |
| FSC / FSG | 4730 / 47 — No Item Name Available |
| Manufacturer | Precision Form Rivet Inc |
| Status | ACTIVE |
| Unthreaded Portion Length | 0.156 INCHES NOMINAL IN |
| Style Designator | HEXAGON, INTERNAL THREAD, SHOULDERED |
| Smallest Inside Diameter | 0.500 INCHES NOMINAL IN |
| Length to Shoulder | 0.344 INCHES NOMINAL IN |
| Width Across Flats | 1.000 INCHES NOMINAL IN |
| Major Unthreaded Outside Diameter | 1.000 INCHES NOMINAL IN |
| Screw Thread Location | INTERNAL |
| Material | ALUMINUM ALLOY 2024 |
| Thread Size | 1/2IN-20 IN |
| Casehardening Indicator | NOT CASEHARDENED |
| Thread Direction | RIGHT-HAND |
| Thread Length | 0.344 INCHES NOMINAL IN |
| Largest Inside Diameter | 0.875 INCHES NOMINAL IN |
| Screw Thread Series Designator | UNF |
| Thread Class | 3B |
| Acquisition Status | ACTIVE |
| HAZMAT | No |
| Part Number | Manufacturer |
|---|---|
| MS21937-5H PRIMARY | Precision Form Rivet Inc (USA) |
| MS21937-5H | Designed Metal Connections Inc Dba Permaswage Usa Div Permaswage, a Pcc Company (USA) |
| MS21937-5H PRIMARY | Sae International Dba Sae International (USA) |
| AS21937 | Sae International Dba Sae International (USA) |
| MS21937-5H PRIMARY | Eaton Aeroquip Llc Dba Jackson North 1 Div Fluid and Electrical Distribution (USA) |
| MS21937-5H | Military Standards Promulgated by Military Departments Under Authority of Defense Standardization Manual 4120 3-M |
| SAE-AS18280 | Sae International Dba Sae International (USA) |
| MS21927-5H | Sae International Dba Sae International (USA) |
| AS18280 | Sae International Dba Sae International (USA) |
| AS18280 | Society of Automotive Engineers Inc (USA) |
| AS21937 | Society of Automotive Engineers Inc (USA) |
| MS21927-5H | Society of Automotive Engineers Inc (USA) |
NSN 4730-00-433-2974 is a Packing Nut, manufactured by Precision Form Rivet Inc, classified under FSC 4730 (No Item Name Available). Status: active.
NSN 4730-00-433-2974 has 12 cross-referenced part numbers: MS21937-5H (Precision Form Rivet Inc), MS21937-5H (Designed Metal Connections Inc Dba Permaswage Usa Div Permaswage, a Pcc Company), MS21937-5H (Sae International Dba Sae International), AS21937 (Sae International Dba Sae International), MS21937-5H (Eaton Aeroquip Llc Dba Jackson North 1 Div Fluid and Electrical Distribution) and 7 more.
There are 3 known substitutes for 4730-00-433-2974: 4730-00-541-2173, 4730-00-684-0564, 4730-00-821-0189. Verify interchangeability with system specifications before substitution.
Key specifications for MS21937-5H: Unthreaded Portion Length: 0.156 INCHES NOMINAL IN; Style Designator: HEXAGON, INTERNAL THREAD, SHOULDERED; Smallest Inside Diameter: 0.500 INCHES NOMINAL IN; Length to Shoulder: 0.344 INCHES NOMINAL IN. 16 total characteristics are documented in the Federal Logistics Information System.