1. Product Overview
The BLCCLOY 4040 Aluminum Extrusion Pivot Hinge is designed to connect 40mm x 40mm series aluminum extrusion profiles, allowing for angular adjustments from 0 to 180 degrees. It is suitable for various industrial aluminum frame structures, 3D printers, CNC routers, and similar projects.
2. Package Contents
Verify that all components listed below are present in your package:

Figure 2.1: Package Contents. This image displays the complete set of components: two pivot hinges, five M8x16mm screws, eight positioning blocks, four smaller screws, two handles, and four T-nuts.
- 2 x Aluminum Profile Pivot Hinge Connectors
- 2 x Handles
- 5 x M8 x 16mm Screws
- 4 x Smaller Screws (for handle attachment)
- 8 x Positioning Blocks
- 4 x T-Nuts
3. Specifications
| Feature | Specification |
|---|---|
| Material | Zinc Alloy |
| Product Dimensions | 1.57"L x 1.57"W (40mm x 40mm) |
| Mounting Type | Aluminum Extrusion Mount |
| Color | Black |
| Compatibility | 40 Series Aluminum Extrusion Profiles (e.g., 4040, 4080) |
| Adjustable Angle | 0 - 180 degrees |

Figure 3.1: Product Dimensions. This image illustrates the key dimensions of the pivot hinge and the M8x16mm screw, confirming compatibility with 40mm series profiles.
4. Setup and Installation
Follow these steps to properly install the pivot hinge connectors:
- Prepare Aluminum Profile: The end of the aluminum extrusion profile where the pivot hinge will be attached requires tapping. The hole must be tapped with an M8 x 1.25 pitch thread to a minimum depth of 9mm. This ensures a secure connection for the flexible pivot joint.

Figure 4.1: Profile Tapping. This image demonstrates the requirement for an M8 x 1.25 tapped hole with a depth greater than 9mm at the end of the aluminum profile.
- Attach Pivot Hinge: Align the pivot hinge connector with the tapped end of the aluminum profile. Secure it using the provided M8 x 16mm screw.

Figure 4.2: Hinge Attachment. This image illustrates the pivot hinge securely attached to the aluminum extrusion profile, showing a correct fit.
- Connect Second Profile: Attach the second aluminum profile to the other side of the pivot hinge. Use the appropriate hardware (screws and T-nuts) to secure it.

Figure 4.3: Connection Examples. This image presents three common ways to connect aluminum profiles using the pivot hinge: A (straight connection), B (corner connection), and C (angled connection).
- Use Positioning Blocks (Optional): For enhanced stability and to fix the pivot position in specific directions, use the provided positioning blocks. Insert them into the slots of the pivot hinge and the aluminum profile as needed.

Figure 4.4: Positioning Block Usage. This image demonstrates how to utilize the positioning blocks to connect profiles in different directions and secure the pivot angle.
- Attach Handle: Secure the handle to the pivot hinge using the smaller screws provided. The handle allows for easy adjustment of the pivot angle.
5. Operating Instructions
The BLCCLOY 4040 Pivot Hinge allows for flexible angular adjustments of connected aluminum profiles. Once installed, the handle can be loosened to change the angle between 0 and 180 degrees. Tighten the handle firmly to secure the desired angle.
- Adjusting Angle: Loosen the handle by turning it counter-clockwise. Adjust the connected aluminum profiles to the desired angle.
- Securing Angle: Once the desired angle is achieved, tighten the handle by turning it clockwise until the connection is firm and stable.
6. Maintenance
To ensure the longevity and optimal performance of your pivot hinges, consider the following maintenance guidelines:
- Cleaning: Wipe the hinges periodically with a clean, dry cloth to remove dust and debris. Avoid abrasive cleaners or solvents that may damage the finish.
- Lubrication: If the pivot mechanism becomes stiff over time, apply a small amount of silicone-based lubricant to the moving parts.
- Fastener Check: Periodically check all screws and nuts for tightness. Re-tighten if necessary to maintain a secure connection.
- Storage: Store unused hinges and components in a dry environment to prevent corrosion.
7. Troubleshooting
This section addresses common issues you might encounter:
- Issue: Excessive Play in Profile Connection
- Possible Cause: The small alignment pieces (positioning blocks) may be too short, or not correctly installed, leading to instability.
- Solution: Ensure the positioning blocks are correctly seated within the extrusion slots and the hinge. If the issue persists, verify the dimensions of your aluminum profiles and ensure they are compatible with 40mm series accessories. Ensure all fasteners are tightened securely.
- Issue: Hinge Does Not Hold Angle Firmly
- Possible Cause: The handle is not tightened sufficiently, or the internal friction mechanism is worn.
- Solution: Fully tighten the handle. If the problem persists, inspect the internal mechanism for wear or damage.
- Issue: Difficulty in Tapping Profile End
- Possible Cause: Incorrect tap size (M8 x 1.25) or insufficient tapping depth (minimum 9mm).
- Solution: Ensure you are using the correct M8 x 1.25 tap and that the hole is tapped to at least 9mm depth. Use appropriate cutting fluid and technique for aluminum.
8. Warranty and Support
No specific warranty information is provided with this product. For support or inquiries regarding the BLCCLOY 4040 Aluminum Extrusion Pivot Hinge, please refer to the retailer or manufacturer's contact information where the product was purchased.
You may also visit the BLCCLOY Store on Amazon for additional product information or to contact the seller.
9. Official Product Videos
There are no official product videos available for this item at this time.