The Defender Security S4573 is a die-cast mailbox lock engineered to secure your mail and provide peace of mind. This threaded spring clip lock replaces many manufacturers’ original equipment mailbox locks, making it an ideal drop-in replacement for standard mailbox designs. Whether you’re protecting residential mail or securing a commercial mailbox, this lock combines reliable security with straightforward installation.
Homeowners and businesses choose this mailbox lock for its durable construction and dependable performance. The die-cast cylinder with nickel-plated face resists corrosion and wear, while the brass pins and spring steel locking clip deliver secure, consistent operation. A precise 90-degree counterclockwise rotation opens smoothly every time, and the threaded body with matching nut allows for optional attachment without the need for additional hardware.
Features and Benefits
- Durable Die-Cast Construction: The die-cast cylinder with nickel-plated face provides corrosion resistance and a polished appearance suitable for any mailbox style.
- Reliable Locking Mechanism: Brass pins and a spring steel locking clip ensure secure operation and a precise 90-degree rotation for smooth, consistent opening.
- Easy Installation: The threaded body and included nut simplify attachment, eliminating the need for additional fasteners or multiple lock types.
- Universal Replacement: Designed to replace many manufacturers’ original equipment locks, making it compatible with a wide range of standard mailbox models.
- Multi-Cam Design: The included multi-cam assortment helps reduce the need to stock individual locks, offering practical versatility.
Specifications
- Brand: Defender Security
- Model: S4573
- Material: Die-cast cylinder with nickel-plated face
- Internal Components: Brass pins, spring steel locking clip
- Attachment: Threaded body with nut for optional attachment
- Rotation: 90-degree counterclockwise
- Finish: Zinc, Nickel
- Type: Threaded spring clip mailbox lock








