MS21044N8 – Military Standard Self-Locking Hexagon Nut
Overview
The MS21044N8 is a high-strength, self-locking hexagon nut designed to meet rigorous military and aerospace standards. This fastener is widely used in critical aircraft and defense applications where vibration resistance, durability, and reliability are essential. Featuring a built-in locking mechanism, it ensures secure fastening without the need for additional locking elements, making it an ideal choice for structural assemblies, engine mounts, and high-stress environments.
Manufactured from corrosion-resistant steel with cadmium plating, the MS21044N8 provides long-lasting performance in extreme operating conditions. Its precision engineering and compliance with military specifications make it a trusted component in both civilian and military aviation.
Key Features
- Self-Locking Design:
- Built-in locking element prevents loosening under high vibration and repeated stress cycles.
- Eliminates the need for additional locking washers or adhesives, reducing maintenance requirements.
- Aerospace-Grade Strength:
- Engineered to withstand high-torque applications and heavy loads without deformation.
- Maintains a secure hold in critical structural and mechanical systems.
- Corrosion-Resistant Coating:
- Cadmium-plated finish protects against oxidation, moisture exposure, and environmental wear.
- Ensures long-term durability in extreme temperature and weather conditions.
- Precision Engineering & Compatibility:
- Conforms to strict military and aerospace specifications for uniformity and reliability.
- Standardized thread class and pitch ensure compatibility with a wide range of aircraft and defense systems.
Technical Specifications
- Part Number: MS21044N8
- Thread Size: 1/2-20 UNF
- Thread Class: 3B
- Material: High-strength steel
- Finish: Cadmium-plated (AMS-QQ-P-416, Type II, Class 2)
- Temperature Rating: Up to 250°F (121°C)
- Height: 0.575 – 0.610 inches
- Width Across Flats: 0.741 – 0.752 inches
- Locking Element: Integrated self-locking mechanism
Aircraft Compatibility & Applications
The MS21044N8 is widely used in military and commercial aircraft, ground support equipment, and aerospace defense systems. It plays a vital role in structural integrity, ensuring that critical fasteners remain secure under high loads and extreme environmental conditions.
Common Applications Include:
- Landing Gear Assemblies: Prevents loosening in high-impact areas subjected to frequent load cycles.
- Flight Control Linkages: Provides a secure and reliable fastening solution for primary and secondary control surfaces.
- Engine Mounting Systems: Withstands high temperatures and vibrations without compromising joint integrity.
- Structural Airframe Components: Used in fuselage and wing assemblies where long-term stability is critical.
Why Choose the MS21044N8 Self-Locking Hexagon Nut?
The MS21044N8 meets stringent military and aerospace standards, offering superior strength, reliability, and vibration resistance. Its self-locking mechanism enhances safety while reducing maintenance requirements, making it an essential component in mission-critical aerospace and defense applications.
Installation & Maintenance Considerations
- Torque Application: Always follow the recommended torque specifications outlined in maintenance manuals for proper installation.
- Inspection Guidelines: Regularly inspect for signs of wear, corrosion, or damage to maintain fastener integrity.
- Replacement Intervals: Replace self-locking nuts periodically or during scheduled maintenance to ensure continued performance and safety.
Note: Always refer to official aircraft documentation and consult certified aviation professionals for installation and maintenance procedures.
Description: Hexagon Self-Locking Nut
Part Number: MS21044N8
Military Fasteners [ Click Here ]
Cessna Aircraft Service Letter [ Click Here ]
Beechcraft Parts Substitution List [ Click Here ]
Alternate Part Numbers: MS51843-37, 029NE080, 2951304, 29E-080, 2M2570, 2533408PC119, AN365-820A
Product Overview
A nut having a flat bottom and 6 sides. An integral feature is incorporated for locking on the threads of a mating member. Excludes nut (1), self-locking, cap.
Item Specification:
| Thread Class | : | 3B | |
| Thread Direction | : | Right-hand | |
| Locking Feature | : | Prevailing torque with nonmetallic insert | |
| Counterbore Diameter | : | 0.511" inches minimum nut and 0.551" inches maximum nut | |
| Lubrication | : | Soluble lubricant | |
| Nut Style | : | Hexagon | |
| Nut Height | : | 0.575" inches minimum and 0.610" inches maximum | |
| End Item Identification | : | W/s:support equipment, B-52 aircraft; support equipment, B-1 aircraft; elevators, aircraft; airborne mobile dir air spt ctl (2ID), (02M JUL83)(AN/UYQ-3A); shipboard material handling equipment (mhe); fire pumps; L.P. compressors; close in weapon system (ciws-phalanx); aircraft (AC-130H, MC-130H, EC-130E, HC-130); HIAB crane (heavy expanded mobility tactical trucks) | |
| Width Across Flats | : | 0.741" inches minimum and 0.752" inches maximum | |
| Temp Rating | : | 250.0 deg fahrenheit nominal | |
| Thread Series | : | UNF | |
| Thread Quantity per Inch | : | 20 | |
| Nominal Thread Size | : | 0.500" inches | |
| Countersink Angle | : | 88.0 degrees nominal nut | |
| Bearing Surface Type | : | Chamfered or washer faced | |
| Bearing Surface Finish | : | 125.0" microinches | |
| Material | : | Steel comp 1006 nut or steel comp 1008 nut or steel comp 1009 nut or steel comp 1010 nut or steel comp 1015 nut or steel comp 1018 nut or steel comp 1035 nut or steel comp 11L37 nut or steel comp 1213 nut or steel comp 12L14 nut | |
| Surface Treatment | : | Cadmium nut and chromate nut | |
| Surface Treatment Document and Classification | : | QQ-P-416, ty 2, cl 3 fed spec single treatment response nut |
**Cessna Aircraft Model 441 Conquest II Illustrated Parts Catalog [ Click Here ]
See Page 1107, Figure 01, Item 10
MS21044N8-bag
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| Additional info | |
|---|---|
| Colors | Gold |
| Features | Prevailing torque with nonmetallic insert |
| Dimensions | |
|---|---|
| Dimensions (W x H x D) | 0.610" x 0.500" x 0.752" inches |
| Length | 0.752" inch |
| Weight | 0.045 lb |
| Specifications | |
|---|---|
| 8130-3 Eligible | Yes |
| ATA Chapter | 51 ATA Standard Practices and Structures |
| Available Conditions | NE / NS |
| Cage Code | 80205 |
| Country of origin | United States of America |
| ECCN / USML | EAR99 |
| FAA Approval Code | PC |
| Hazmat Code | Not Applicable |
| Hazmat(Y/N) | N |
| Material | Steel comp |
| NSN | 5310-00-877-5795 |
| Schedule B | 7318.16.0085 |
| Thread | 3B |
| Total Shelf Life (days) | Not Applicable |
| Type | Nut |
| Units of Measure (UoM) | Each |
| Brand | Aero Performance |
| Color | Gold |
| Condition status | Depreciated |
