Introduction
This manual provides instructions for the proper identification, use, and care of your EasyKeys Tubular Replacement Key for CompX Chicago HG4240 locks. Please read this manual carefully before using your new key to ensure correct application and optimal performance.
Setup: Identifying Your Lock Code
Before ordering or using your replacement key, it is crucial to accurately identify the lock code of your existing lock. The HG4240 key is specifically cut for CompX Chicago locks with the HG4240 code. Incorrect code identification will result in an unusable key.
Where to Find Your Lock Code
Your lock code can typically be found in several locations:

The image above illustrates common locations for lock codes. Look for the code on the key itself (e.g., FR322), on the face of the lock cylinder (e.g., FR322), on a label inside or behind the lock mechanism (e.g., CODE: G38), or on a label affixed to the cabinet or door near the lock (e.g., HF321).
Important Notes on Lock Codes:
- Manufacturer Specificity: Lock codes are specific to the manufacturer. Ensure your lock is a CompX Chicago brand when using this HG4240 key.
- Key Cut Variations: Even if codes appear similar across different brands, the actual key cuts vary significantly. Always verify the manufacturer.
Operating Your Replacement Key
This tubular key is designed for simple operation in compatible CompX Chicago locks. Insert the key fully into the lock cylinder and turn it to engage or disengage the locking mechanism.
- Insertion: Gently insert the key into the tubular lock cylinder until it is fully seated.
- Turning: Turn the key clockwise or counter-clockwise, depending on the lock's design, to lock or unlock. Do not force the key if it resists turning.
- Removal: Once the lock is engaged or disengaged, return the key to its original insertion position and gently pull it out.
Maintenance
Proper maintenance ensures the longevity and smooth operation of your key and lock.
- Cleaning: Keep the key clean and free from dirt or debris. Wipe with a soft, dry cloth if necessary.
- Lubrication: If the lock mechanism becomes stiff, apply a small amount of graphite-based lubricant specifically designed for locks into the keyway, not oil-based lubricants.
- Storage: Store the key in a dry place, away from extreme temperatures or corrosive materials.
- Avoid Damage: Do not use the key for purposes other than operating the lock, such as opening packages or prying objects, as this can bend or damage the key.
Troubleshooting
If you encounter issues with your replacement key, consider the following:
- Key Does Not Insert Fully: Check for obstructions in the lock cylinder. Ensure the key is oriented correctly. If the key is bent or damaged, it may need replacement.
- Key Does Not Turn: Verify that the lock code on your key matches your lock. Ensure the key is fully inserted. The lock mechanism might be jammed or require lubrication. Do not force the key.
- Key Is Stuck: Gently wiggle the key while applying slight turning pressure. Do not pull forcefully, as this can break the key inside the lock. Lubrication may help.
- Lock Still Not Working: If the key is correct and the lock is well-maintained, the issue might be with the lock mechanism itself, not the key. Consider consulting a locksmith.
Specifications
| Feature | Detail |
|---|---|
| Brand | EasyKeys |
| Model Name | HG4240 |
| Lock Type | cam |
| Material | Brass |
| Item dimensions L x W x H | 0.5 x 0.5 x 1 inches |
| Item Weight | 0.25 Pounds |
| Included Components | Key |
| Special Feature | Adjustable Fit, Custom Cut Key, Durable |
| Manufacturer | CompX Chicago |
| Part Number | HG4240-compxchicago-key-948381 |
| Color | Brass |
| Number of Pieces | 1 |
Warranty Information
This product is covered by the standard return and replacement policy of the seller. For specific details regarding warranty coverage, returns, or replacements, please refer to the purchase platform's policies or contact the seller directly. Keep your proof of purchase for any warranty claims.
Customer Support
For further assistance, questions, or concerns regarding your EasyKeys Tubular Replacement Key, please contact the seller, EasyKeys Inc. USA, through the Amazon platform where the purchase was made. You can typically find seller contact information in your order history.
Manufacturer: CompX Chicago (for lock mechanism inquiries)
Key Supplier: EasyKeys Inc. USA