GM 11547420 Bolt M4.2X1.41X20.8

( Brand: Gm ), ( Manufacturer Part Number: 11547420 ), ( Part Type: Bolt ), ( Genuine Oem: Yes ), ( Warranty: 1 Year ), ( Fitment Type: Direct Replacement ), ( Make: Buick ), ( Year: 2018 2019 2020 2021 2022 2023 2024 2025 ), ( Placement On Vehicle: Left Lower, Left Upper, Left Outer, Left Front, Left Inner )

Review GM Genuine Multi purpose Bolt fits M4 2018–2025

The **GM 11547420 M4.2 1.41 20.8 Multi-Purpose Bolt** is a precision-engineered fastener designed to deliver exceptional performance across a wide range of industrial, automotive, and mechanical applications. This bolt features a **metric M4.2 thread size**, which provides a slightly larger shank diameter compared to standard M4 bolts, offering enhanced load-bearing capacity and resistance to stripping under high torque or dynamic stress. With a **1.41 mm thread pitch**, it ensures a secure, tight fit while maintaining compatibility with most standard M4.2 thread holes, reducing the risk of slippage or loosening over time. The **20.8 mm nominal length** strikes an ideal balance between structural integrity and versatility, making it suitable for applications requiring moderate to deep fastening such as panel attachments, chassis mounting, or structural connections in automotive bodywork, machinery, or DIY projects. Constructed from high-quality **carbon steel**, this bolt is heat-treated to achieve a robust tensile strength, ensuring durability in demanding environments where exposure to vibration, temperature fluctuations, or cyclic loading may occur. Its **hex head design** allows for easy installation and removal with standard wrenches or sockets, while the **fine thread engagement** minimizes the risk of galling or thread damage during repeated assembly and disassembly. Whether used in automotive repair, custom fabrication, or general mechanical assembly, this bolt exemplifies reliability and precision, making it a dependable choice for professionals and enthusiasts alike who demand performance without compromise.

### **Pros and Cons of buying a GM 11547420 M4.2x1.41x20.8 Multi-Purpose Bolt**

1. **High Strength and Durability** The bolt is designed for heavy-duty applications, making it suitable for automotive, industrial, and mechanical systems where reliability is critical. The M4.2 thread size and 20.8mm length provide a robust connection capable of handling significant loads.

2. **Versatility** The "multi-purpose" designation suggests it can be used in various applications, including engine components, suspension systems, chassis mounts, and aftermarket modifications. This flexibility makes it a practical choice for DIY projects or professional repairs.

3. **Compatibility with GM Vehicles** As a GM part (likely for older GM engines or transmissions), it is engineered to meet the manufacturer s specifications, reducing the risk of compatibility issues in stock or modified applications.

4. **Standardized Threading** The M4.2x1.41 metric threading ensures compatibility with a wide range of tools, sockets, and fasteners, making installation and replacement straightforward.

5. **Cost-Effective for Bulk Use** If you frequently work on projects requiring similar bolts, purchasing this part in bulk (if available) can be more economical than buying individual alternatives.

6. **Corrosion Resistance (Assuming Proper Material)** High-quality steel bolts with proper coatings (e.g., zinc-plated or black oxide) resist rust and wear, extending the lifespan of the connection.

7. **Easy Availability** Being a common GM part, it is likely stocked by auto parts retailers, online marketplaces, or specialty fastener suppliers, reducing lead times.

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1. **Potential Counterfeit Risk** Aftermarket or generic bolts may not meet GM s exact specifications, leading to premature failure or poor performance. Always verify the supplier s reputation or purchase from trusted sources like OEM or reputable aftermarket brands.

2. **Limited Length for Some Applications** At 20.8mm, this bolt may be too short for certain deep or spaced-out mounting points, requiring extension bolts or washers to achieve proper torque and alignment.

3. **Thread Stripping Risk** If the mating hole is not properly tapped or the bolt is overtightened, the threads can strip, compromising the connection. Pre-drilling or using the correct torque specifications is essential.

4. **Material Quality Variability** Not all aftermarket bolts are made from high-grade steel. Inferior materials may lack the tensile strength or corrosion resistance of OEM parts, leading to failure under stress.

5. **Overkill for Light-Duty Use** For non-critical applications (e.g., trim or decorative panels), a heavier-duty bolt may be unnecessary, increasing cost without added benefit.

6. **Torque Sensitivity** Over-tightening can strip threads or deform the bolt, while under-tightening may result in loosening over time. Precise torque tools are recommended.

7. **Compatibility with Non-GM Systems** While metric threading is universal, the specific design (e.g., head style, drive type) may not match non-GM applications, limiting its universal use.

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The **GM 11547420 M4.2x1.41x20.8 multi-purpose bolt** is a **reliable, high-strength fastener** ideal for automotive and mechanical applications requiring durability and compatibility with GM systems. Its versatility and standardized threading make it a practical choice for repairs, modifications, or bulk use. However, **quality control, proper installation, and application-specific considerations** (e.g., torque, hole prep) are critical to avoid failure.

- **Buy from a trusted source** (e.g., OEM, reputable aftermarket brands like ACDelco, Fel-Pro, or local auto parts stores with return policies) to avoid counterfeits.

- **Verify the application** Ensure the bolt s length and thread size match the mounting point. Use extension bolts or washers if needed.

- **Use the correct torque specification** Refer to the manufacturer s guidelines or a torque wrench to prevent over/under-tightening.

- **Consider alternatives** If the bolt is for a non-critical or light-duty application, a slightly less expensive option (e.g., a standard M4 bolt) may suffice.

- **Store properly** Keep bolts in a dry environment to prevent rust, especially if they are uncoated or exposed to moisture.

**Final Verdict:** **Worth purchasing for GM-related heavy-duty applications** if sourced carefully and installed correctly. For non-GM or non-critical uses, weigh the cost against alternatives.

Details:

Electrical parts are non returnable. All parts must be new with the original packaging and manufacturing stickers. Just message in and ask. Inquire about this before the time of purchase.

Metal parts may have scratches/Scuffs on them, but it does not interfere with the working of part itself and they are new unused.

part #: 11547420 prices

• $13.01-$17.56

specifications vintagecarbumperus:

• for models: M4
• for years: 2018-2025
• brand: Gm
• mpn: 11547420
• part type: Bolt
• genuine oem: Yes
• warranty: 1 Year
• fitment type: Direct Replacement
• make: Buick
• year: 2018 2019 2020 2021 2022 2023 2024 2025
• placement on vehicle: Left Lower, Left Upper, Left Outer, Left Front, Left Inner

seller vintagecarbumperus:

• rating: 99.9%
• # reviews: 31669
• city: Manchester, New Hampshire

offer vintagecarbumperus:

• availability: In Stock
• quantity: 3
• started: June 9, 2026
• options: Ship-to-home
• sold: 0

returns vintagecarbumperus:

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

payments vintagecarbumperus:

• other
• credit card: Visa
• wallet: Apple-pay

general vintagecarbumperus:

• Exterior Parts Accessories > Bumpers Components > Bumper Inserts Covers
• condition: New

shipping vintagecarbumperus:

• class: Standard, Expedited, One-day
• type: Fixed
• service: Standard, Expedited, Overnight
• cost: $0.00
• transit: 3-8 Days

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