MALLORY 9-72203 Locknut 093789171337

( Brand: Mallory ), ( Manufacturer Part Number: 9-72203 ), ( Type: Nuts ), ( UPC: 093789171337 )

Review MALLORY Locknut Oem#

The **Mallory 9-72203 Locknut** is a high-performance, precision-engineered fastener designed to provide exceptional security and reliability in demanding applications where vibration, shock, or repeated disassembly could compromise the integrity of a threaded assembly. Crafted from **high-strength, corrosion-resistant steel**, this locknut features a **self-locking mechanism** that ensures a tight, secure hold without the need for additional locking compounds or washers, reducing the risk of loosening over time. Its **coarse thread design** allows for quick and easy installation while maintaining a firm grip, making it ideal for use in automotive, industrial, marine, and outdoor equipment where durability and performance are critical. The nut s **hexagonal shape** provides ample torque surface area, enabling wrench or socket application without slippage, even in tight or hard-to-reach spaces. Engineered to withstand extreme environmental conditions including exposure to moisture, saltwater, and temperature fluctuations the **Mallory 9-72203** is treated with a **protective zinc plating** that resists rust and corrosion, ensuring longevity in harsh settings. Whether securing critical components in a vehicle suspension system, stabilizing heavy-duty machinery, or reinforcing marine hardware, this locknut delivers consistent performance with minimal maintenance. Its **universal compatibility** with standard bolts and studs of similar thread sizes makes it a versatile choice for both original equipment manufacturers and DIY enthusiasts seeking a dependable, long-lasting solution.

**Pros and Cons of buying a Mallory 9-72203 Locknut**

The Mallory 9-72203 is a popular self-locking nut designed for securing bolts in applications where vibration or loosening is a concern. Below is a detailed breakdown of its advantages and disadvantages.

### **Pros**

1. **Self-Locking Mechanism** The internal nylon insert creates friction, preventing the nut from loosening due to vibration or shock. This is particularly useful in automotive, marine, and industrial applications where components are subject to movement.

2. **Wide Compatibility** The 9-72203 is a standard size (7/16" thread) that fits many bolts, including those used in engines, suspension systems, and other mechanical assemblies. It is commonly found in aftermarket automotive parts and DIY projects.

3. **Cost-Effective** Compared to specialized locking nuts or thread-locking compounds, the Mallory 9-72203 is relatively inexpensive and widely available, making it a budget-friendly solution for temporary or low-stress applications.

4. **Easy to Install and Remove** Unlike some proprietary locking nuts, this one can be installed and removed with standard tools (socket wrench or pliers) without requiring special equipment.

5. **Corrosion Resistance (to an extent)** The zinc-plated finish provides some protection against rust, though it is not as durable as stainless steel or cadmium-plated alternatives.

6. **Common Availability** Since it is a well-known part, it can be easily sourced from hardware stores, online retailers (Amazon, RockAuto, etc.), and automotive supply shops.

### **Cons**

1. **Limited Load Capacity** While effective for many applications, the nylon insert may wear out over time under high stress or extreme temperatures, reducing its locking ability. It is not suitable for heavy-duty or high-torque applications where a metal locknut (e.g., castellated or slotted) would be better.

2. **Temperature Sensitivity** Prolonged exposure to high heat (e.g., near exhaust systems) can degrade the nylon insert, causing the nut to lose its locking properties. This makes it less ideal for high-performance or racing applications.

3. **Not Reusable in All Cases** If the nylon insert is damaged or worn, the nut may no longer function properly. In some cases, it may need to be replaced rather than reused.

4. **Potential for Over-Tightening** The nylon can shear if the bolt is overtightened, which could strip the threads or damage the bolt. This requires careful installation to avoid.

5. **Not Ideal for Outdoor or Corrosive Environments** While zinc-plated, it is not as resistant to saltwater, chemicals, or prolonged moisture exposure as stainless steel or coated alternatives. For marine or outdoor use, a more corrosion-resistant option may be preferable.

6. **May Not Fit All Bolts Perfectly** Some bolts have slightly irregular threads, and the nylon insert can sometimes make installation difficult if the threads are not clean or properly aligned.

### **Conclusion**

The Mallory 9-72203 locknut is a practical and affordable choice for general automotive and mechanical applications where vibration is a concern but high stress or extreme conditions are not present. It excels in everyday use, such as securing suspension components, engine mounts, or other non-critical parts where reliability is needed without the complexity of thread-locking compounds or specialized nuts.

However, it is not suitable for high-performance, high-heat, or heavy-duty applications where metal locknuts or thread adhesives would be more appropriate. If you are working on a project with high torque, extreme temperatures, or corrosive environments, consider alternatives like castellated nuts, slotted nuts, or stainless steel locknuts.

### **Recommendation**

- You need a simple, cost-effective solution for vibration control in moderate-stress applications.

- You are working on a standard automotive or mechanical project where heat and corrosion are not major concerns.

- You prefer a reusable, tool-friendly option without the need for thread-locking compounds.

- The application involves high torque, extreme heat, or frequent disassembly/reassembly.

- You are working in a corrosive environment (e.g., marine, outdoor, or chemical exposure).

- You need a more permanent or high-strength locking solution (e.g., for racing or industrial machinery).

For most casual DIYers and general automotive work, the Mallory 9-72203 is a solid choice. For specialized applications, research alternatives like **castellated nuts, slotted nuts, or thread-locking compounds** to ensure optimal performance.

Details:

Designed for: Universal. Satisfaction Guaranteed: Before opening a request. Number: 908064. Product must be in original package with tags, and new re-saleable condition.

You can also leave us a message. Shipping charges listed above apply to the Contiguous USA Only. Socket included: No. MALLORY Locknut 9-72203 OEM# 908064.

Replaces: OMC 908064, Fits: Stringer Drive Ball Gear, Best Service Fast Shipping. Please verify your junk/bulk mail folder as our e-mail reply may end up in there.

part #: 972203 prices

• $13.00-$14.56

specifications ouboaen:

• brand: Mallory
• mpn: 9-72203
• type: Nuts
• upc: 093789171337

seller ouboaen:

• city: Champlain, New York
• rating: 99.3%
• # reviews: 89319

payments ouboaen:

• other
• wallet: Paypal
• credit card: Diners-club

offer ouboaen:

• options: Ship-to-home
• availability: In Stock
• sold: 0
• quantity: 3
• started: May 31, 2026

general ouboaen:

• Boat Parts > Outboard Engines Components > Powerhead Components
• condition: New

shipping ouboaen:

• transit: 4-9 Days
• service: Standard
• cost: $0.00
• class: Standard
• type: Fixed

returns ouboaen:

• time: 30 Days
• policy: Returns Accepted
• paid by: Seller

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