1. Introduction
The Thermalright LGA1851-BCF is a specialized CPU correction fastener designed for Intel LGA1851 platform processors. Its primary function is to address potential CPU bending or warping issues that can occur with standard mounting mechanisms, ensuring optimal contact between the CPU and cooler for improved thermal performance and stability. This bracket provides even pressure distribution across the CPU integrated heat spreader (IHS), preventing wear and tear on the CPU cover during multiple installations.

Image: Thermalright LGA1851-BCF bracket with included screwdriver and an example of the bracket installed on a CPU.
2. Product Overview
The LGA1851-BCF is crafted from high-quality AL6063-T5 aluminum alloy, utilizing an anodized sandblasting process for durability and a premium finish. It is engineered to provide a non-traceable, full-fit pressure distribution, which helps correct CPU curvature and ensures consistent contact without marking or damaging the CPU cover, even after multiple installations. This product is specifically designed for Intel Ultra 200S series CPUs on the LGA1851 platform.



Key Features:
- Curvature Correction: Designed to correct CPU bending, ensuring a flat contact surface.
- Non-Marking Installation: Prevents wear and tear on the CPU cover.
- Premium Material: Constructed from AL6063-T5 aluminum alloy with an anodized sandblasting finish.
- Even Pressure Distribution: Applies uniform pressure across the CPU for optimal thermal transfer.
- LGA1851 Compatibility: Specifically supports Intel Ultra 200S series CPUs on the LGA1851 platform.

Image: Visual comparison illustrating how the LGA1851-BCF corrects CPU curvature compared to the original buckle.

Image: Diagram highlighting the benefits of the LGA1851-BCF, including curvature correction and non-marking installation.
3. Specifications
| Feature | Detail |
|---|---|
| Model | LGA1851-BCF |
| Type | CPU Holder / Correction Fastener |
| Compatibility | Intel LGA1851 Platform (Ultra 200S series CPUs) |
| Dimensions (L x W x H) | 70 x 53.5 x 6.25 mm |
| Material | AL6063-T5 Aluminum Alloy |
| Color | Black |
4. Package Contents
Please verify that all items are present in your package:
- 1x Thermalright LGA1851-BCF Correction Fastener
- 1x L-shaped Screwdriver
- 4x Mounting Screws

Image: Diagram showing the package contents and an overview of the installation process.
5. Setup and Installation
Follow these steps carefully to install the Thermalright LGA1851-BCF correction fastener:
- Remove Original ILM: Use the included L-shaped screwdriver to carefully remove the original Integrated Loading Mechanism (ILM) from your motherboard's CPU socket. Keep the original screws as they will be reused.
- Install CPU: Place your Intel LGA1851 CPU into the socket, ensuring it is correctly aligned by matching the triangle signs on the CPU and socket.
- Install BCF: Position the LGA1851-BCF correction fastener over the CPU. Align the holes on the BCF with the screw holes on the motherboard.
- Secure BCF: Use the original screws (removed in step 1) to secure the BCF. Tighten the screws evenly in a diagonal pattern until snug. Do not overtighten.
- Check Installation Direction: Ensure the BCF is installed in the correct orientation as indicated by any markings on the bracket or motherboard.

Image: Top-down view of the LGA1851-BCF correctly installed on a CPU.

Image: Angled view of the LGA1851-BCF installed on a CPU.
For a more detailed visual guide, please refer to the official user manual PDF: View User Manual (PDF)
6. Operating Instructions
The Thermalright LGA1851-BCF is a passive component designed to improve CPU contact and thermal performance. Once correctly installed, no further operational steps are required. It works by maintaining even pressure on the CPU, which helps prevent bending and ensures optimal heat transfer to your CPU cooler.
7. Maintenance
- Regular Inspection: Periodically check the mounting screws to ensure they remain snug. Do not overtighten.
- Cleaning: If you remove the bracket for maintenance or CPU replacement, gently clean any thermal paste residue from the bracket and CPU using isopropyl alcohol and a lint-free cloth.
- Storage: Store the bracket in a dry, dust-free environment if not in use.
8. Troubleshooting
- Bracket Does Not Fit: Ensure your CPU is an Intel LGA1851 (Ultra 200S series) processor. The bracket is not compatible with other socket types. Double-check the orientation during installation.
- High CPU Temperatures After Installation:
- Verify that the bracket is installed correctly and the screws are tightened evenly.
- Ensure sufficient thermal paste has been applied between the CPU and the cooler.
- Check that your CPU cooler is properly mounted and making full contact with the CPU.
- Scratches/Marks on CPU: The LGA1851-BCF is designed for non-marking installation. If marks appear, ensure the bracket was installed correctly and no foreign objects were present during installation. Avoid excessive force when tightening.
9. User Tips
- Always handle your CPU and motherboard with care to avoid damage to sensitive components.
- When applying thermal paste, a small pea-sized dot in the center of the CPU is usually sufficient. The pressure from the cooler and bracket will spread it evenly.
- Consider watching a video tutorial for visual guidance on CPU bracket installation if you are new to PC building.
10. Warranty and Support
Warranty Information:
This Thermalright LGA1851-BCF correction fastener comes with a 1-year warranty from the date of purchase. The warranty covers defects in materials and workmanship under normal use. Please retain your proof of purchase for warranty claims.
Customer Support:
For technical assistance, warranty claims, or any other inquiries, please contact Thermalright customer support:
- Website: www.thermalright.com
- Hotline: (02)29155123
- Email: support@thermalright.com
- Postal Code: 23145
Thermalright reserves the right to modify product specifications and information without prior notice.