Prime-Line S4129 Mailbox Lock Nickel Steel Counter Clockwise Secure your mailbox with the Prime-Line S4129 nickel-plated steel mailbox lock, a durable and reliable replacement for American Device 5-pin locks. Designed for easy installation and smooth operation, this tumbler lock features a diecast cylinder with a plated face, brass pins, and plated steel cams for consistent performance and resistance to wear. The spring steel locking clip ensures a secure hold, while the clip-on style allows for quick attachment to standard mailbox mechanisms without the need for additional hardware. This lock is engineered to open with a 90-degree counter-clockwise turn, with the locked position indicated by the downward-facing cam. It is specifically designed to replace American Device locks and is compatible with standard mailbox configurations requiring a 5-pin keyed lock system. The Hudson keyway type ensures compatibility with common key profiles used in residential and commercial mailboxes. Finished in a sleek nickel plating over steel, the lock offers corrosion resistance and a clean, professional appearance that withstands outdoor exposure. It comes complete with two keys, providing convenient access for homeowners, property managers, or postal personnel. The compact design measures 1.25 inches in length, 3.8 inches in width, and 4.8 inches in height, with a face width of 1-7/16 inches, fitting seamlessly into standard lock cutouts. Weighing just 0.150 pounds, the S4129 combines lightweight construction with robust functionality, making it ideal for daily use in both private and multi-unit mailboxes. Features - Mailbox lock designed as a direct replacement for American Device 5-pin locks - Opens with a 90-degree counter-clockwise turn; locked position is down - Clip-on style for quick, tool-free installation - Diecast cylinder with plated face for durability and weather resistance - Brass pins and plated steel cams ensure smooth, long-lasting operation - Spring steel locking clip provides secure attachment - Hudson keyway type for reliable key compatibility - Includes 2 keys for convenient access - Nickel-plated steel construction resists corrosion and wear - Compact size fits standard mailbox lock cutouts - Ideal for residential, commercial, and multi-family mailboxes Specifications - Brand Name: Prime-Line - Model Name: Prime-Line S4129 - Part Number: S4129 - UPC: Not specified - Global Trade Identification Number: Not specified - Product Type: Mailbox Lock - Lock Type: Tumbler - Keyway Type: Hudson - Key Type: Keyed - Number of Keys Included: 2 - Finish: Nickel - Material: Steel - Style: Clip On - Direction of Operation: Counter Clockwise - Dimensions: 1-7/16 in W - Length: 1.25 in - Width: 3.8 in - Height: 4.8 in - Each Weight: 0.150 lb - Manufacturer: Prime-Line - Nomenclature: S4129 MAIL BOX LK AMER 5-PIN Product Application The Prime-Line S4129 mailbox lock is engineered for use in residential and commercial mailboxes requiring a reliable, American Device-compatible locking mechanism. Commonly used in curb-side, wall-mounted, and cluster box units, it provides secure access control for postal service and users alike. Its durable construction and precise design make it ideal for replacement in worn or damaged locks, ensuring continued functionality and mailbox security. With easy clip-on installation and consistent performance, this lock is a trusted solution for property managers, maintenance professionals, and homeowners seeking a high-quality, long-lasting mailbox lock.