Prime-Line U 9970 Deadlock – Jimmy-Resistant Brass Cross-Bolt Lock

The Prime-Line U 9970 Deadlock is built to help secure entry doors with a durable diecast body and a brass-colored finish that resists everyday wear. Its jimmy-resistant cross-bolt design works by providing a robust surface-mounted lock that helps discourage attempts to spread the door frame. While no product can promise absolute security, this lock is designed to offer a dependable, low-maintenance option for homes and small businesses.

Designed for versatility, the U 9970 fits wood or metal doors from 1-3/8" to 2-3/8" thick and installs as a surface-mounted device on either the inside or outside of the door. The mechanical cross-bolt system delivers a straightforward locking action that you can operate with a standard key. The included tamper-resistant shutter guard adds an additional layer of deterrence against tampering, helping to keep the mechanism shielded when not in use.

Key benefits at a glance

• JIMMY-RESISTANT DESIGN: The cross-bolt setup helps resist forced entry that might attempt to spread the frame.
• DUAL-PANEL SECURITY: The diecast construction and brass finish combine durability with a refined look.
• EASY INSTALLATION: Clear instructions and mounting template support quick setups on both wood and metal doors.
• INCLUDED HARDWARE: Angled strike, rim cylinder, trim ring, fasteners, two keys, and a shutter guard are part of the package.

Practical uses and scenarios

• Residential doors where you want an added layer of defense for entryways and common areas.
• Small office doors or storefronts that benefit from a robust surface-mounted lock with a clean brass aesthetic.
• Retrofits on doors where a single-cylinder deadlock is preferred for a straightforward lock-and-key solution.

Installation notes and compatibility

Ensure your door backset, cross bore, and thickness align with the product’s specs before purchasing. The unit requires a 1-1/4" hole and uses the Kwikset/Segal keyway. The kit includes an angled strike to support precise alignment during mounting.

What’s included

• Deadlock body in brass finish
• Angled strike, rim cylinder, trim ring
• Fasteners, mounting plate, two keys
• Tamper-resistant shutter guard and instruction sheet