ARP 640-1250 Chromemoly Bolts 672036016883 1/4 20

( Brand: Arp ), ( Manufacturer Part Number: 640-1250 ), ( Part Type: Bolt ), ( UPC: 672036016883 )

Review ARP 1/4 Inch 20 Chromemoly Bolts

The **ARP 640-1250 1/4" x 20" Chrome Moly Steel Bolt** is a premium-grade fastener engineered for high-stress applications where durability, precision, and corrosion resistance are paramount. Crafted from **4130 Chromoly steel**, this bolt delivers an exceptional balance of strength and toughness, making it ideal for automotive, aerospace, industrial machinery, and performance tuning scenarios where reliability under extreme conditions is critical. The **1/4-inch diameter** shank provides substantial tensile strength, capable of withstanding significant loads without deformation, while the **20-inch length** ensures versatility for a wide range of mounting and structural applications, from suspension components to engine bay reinforcements. The **high-quality chrome moly construction** not only enhances the bolt s resistance to fatigue and wear but also ensures consistent performance over prolonged use, even in harsh environments where salt, moisture, or temperature fluctuations could compromise lesser-grade fasteners. Finished with a **bright zinc plating** for added corrosion protection, these bolts are designed to maintain their integrity in both indoor and outdoor settings, reducing the risk of rust and extending the lifespan of the components they secure. Whether used in custom fabrication, high-performance vehicle builds, or industrial frameworks, the **ARP 640-1250** stands as a testament to engineering precision, offering a robust solution for professionals who demand nothing less than superior quality in their critical connections.

Buying **ARP 640-1250 1/4-20 Chrome Moly (4130) bolts** commonly used in automotive, motorcycle, and performance applications has several advantages and drawbacks depending on your needs. Below is a detailed breakdown.

### **Pros of Buying ARP 640-1250 1/4-20 Chrome Moly Bolts**

1. **High Strength and Durability**

Chrome moly (4130) steel is a heat-treated alloy known for its excellent strength-to-weight ratio, making it ideal for high-stress applications like engine mounts, suspension components, or performance upgrades. These bolts are designed to handle significant loads without stretching or failing under vibration or dynamic stress.

2. **Precision Manufacturing**

ARP (Advanced Racing Products) is a well-regarded brand in the performance aftermarket, known for tight tolerances and consistent quality. The **640-1250** series is specifically engineered for critical applications where reliability is paramount. The **1/4-20 thread** is a standard size, ensuring compatibility with many aftermarket and OEM parts.

3. **Corrosion Resistance**

Chrome moly steel is more resistant to corrosion compared to standard carbon steel, especially when properly coated (e.g., with ARP s proprietary treatments). This makes them suitable for outdoor or high-moisture environments, though they are not as corrosion-resistant as stainless steel.

4. **Widely Compatible**

The **1/4-20 thread** is a common size used in engine mounts, sway bars, subframes, and other automotive components. These bolts are often used in place of stock bolts in performance builds, where higher clamp load is desired.

5. **Aftermarket Support and Availability**

ARP bolts are widely available through performance parts retailers, online marketplaces, and directly from ARP s website. They are also often included in ARP s engine mounts, sway bars, and other performance products, making them a convenient choice for builders.

6. **Proven Performance in Racing and Street Applications**

ARP bolts are trusted by racers and tuners for their ability to maintain preload under extreme conditions. They are commonly used in **drag racing, road racing, and high-performance street builds**, where reliability is critical.

7. **Thread Locking Capability**

ARP bolts are designed to work with **ARP s thread locking compounds** (e.g., ARP s own thread locker or Loctite), which helps prevent loosening under vibration a common issue with standard bolts.

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### **Cons of Buying ARP 640-1250 1/4-20 Chrome Moly Bolts**

1. **Higher Cost Compared to Standard Bolts**

ARP bolts are significantly more expensive than basic carbon steel or even stainless steel bolts. For example, a single **1/4-20 x 2" ARP 640-1250 bolt** will cost **$5 $10 each**, whereas a comparable carbon steel bolt might cost **$0.50 $2**. This can add up quickly in large quantities.

2. **Not Ideal for All Applications**

While these bolts excel in high-stress, static or low-vibration applications (e.g., engine mounts), they may be **overkill for low-stress parts** (e.g., interior trim, non-critical body panels). In such cases, cheaper bolts (like Grade 8 or stainless steel) would suffice.

3. **Potential for Over-Tightening Risks**

Chrome moly bolts are **not as forgiving as stainless steel** when it comes to overtightening. If installed with excessive torque, they can **strip threads, crack, or fail catastrophically**. Proper torque specifications must be followed to avoid damage.

4. **Limited Corrosion Resistance in Extreme Conditions**

While better than carbon steel, chrome moly is **not as corrosion-resistant as 300-series stainless steel**. In **salt-heavy environments (e.g., winter driving), coastal areas, or off-road use**, stainless steel bolts may be a better long-term choice despite being more expensive.

5. **Requires Proper Installation Knowledge**

ARP bolts are **not "drop-in" replacements** for all applications. They often require **pre-drilling, proper torqueing, and sometimes even heat treatment** (e.g., for engine mounts). Improper installation can lead to **bolt failure or component damage**.

6. **Not Always Necessary for Stock or Mild Modifications**

If you re doing **basic maintenance or stock-level upgrades**, ARP bolts may not be justified. For example, replacing a **stock sway bar bolt** with an ARP bolt is overkill unless you re pushing the vehicle to extreme limits.

7. **Potential for Misuse in Non-ARP Applications**

Some builders mistakenly use ARP bolts in **non-critical areas** (e.g., body panels, interior hardware) where they are unnecessary. This can lead to **wasted money** since cheaper bolts would work fine.

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### **Conclusion and Recommendation**

**ARP 640-1250 1/4-20 Chrome Moly bolts are an excellent choice for high-performance, high-stress automotive applications** where reliability and strength are critical. They are ideal for:

- **Engine mounts** (especially in high-horsepower builds)

- **Sway bars and subframe connectors**

- **Critical suspension components**

- **Race applications** (drag racing, road racing, time attack)

- **Any application where stock bolts are insufficient**

- **Basic maintenance or stock-level modifications**

- **Low-stress applications** (e.g., interior trim, non-critical body panels)

- **Extreme corrosion environments** (where stainless steel may be better)

- **Budget-conscious builds** where cost efficiency is a priority

- You are building a **high-performance or racing vehicle**.

- You are replacing **stock bolts in critical areas** (e.g., engine mounts, sway bars).

- You need **maximum reliability under heavy loads**.

- You are using them in an **ARP or performance parts kit** (e.g., ARP engine mounts, sway bars).

- You are doing **basic maintenance or stock upgrades**.

- You are working on **non-critical components** where cheaper bolts suffice.

- You are in a **high-corrosion environment** (consider stainless steel instead).

- You are on a **tight budget** and can use Grade 8 or stainless steel bolts instead.

For most **serious performance builds**, ARP bolts are worth the investment due to their **proven strength and reliability**. However, always **follow torque specifications** and ensure proper installation to maximize their effectiveness.

Details:

American Express.

part #: 6401250 prices

• $16.99-$26.73

specifications accperformanc:

• brand: Arp
• mpn: 640-1250
• part type: Bolt
• upc: 672036016883

offer accperformanc:

• sold: 0
• quantity: 10
• options: Ship-to-home
• started: March 9, 2026
• availability: In Stock

shipping accperformanc:

• transit: 4-8 Days
• type: Fixed
• class: Standard
• cost: $15.99
• service: Standard

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seller accperformanc:

• # reviews: 619537
• city: , Ohio
• rating: 99.2%

general accperformanc:

• Parts Accessories > Permance Racing Parts > Accessories
• condition: New

returns accperformanc:

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

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