Yale PM444 Door Security Bolt (Chubb 8002)

The Yale PM444, also known as the Chubb 8002, is a reliable and discreet mortice rack bolt designed to enhance the security of wooden doors, especially rear doors which are typically more vulnerable to forced entry. This bolt complies with insurance standards requiring key-operated locks at both the top and bottom of rear entry doors.

The PM444 bolt is morticed directly into the door, meaning it remains concealed when the door is closed – preserving the aesthetics of your property while providing increased protection against lifting and forced entry attempts. It is a popular choice for homeowners seeking additional peace of mind without altering the external look of their doors.

This bolt is operated from the inside only using a splined key, making it ideal for securing residential wooden doors in homes, flats, and commercial buildings. Our London locksmiths frequently install the PM444 across the city, including recent fittings in Tottenham Court Road (W1) and Abbey Wood (SE2).

• Finishes/Colours:
  • White
  • Brass
• Features:
  • Morticed auxiliary security bolt for timber doors
  • Meets insurance requirements for back door locking
  • Helps prevent “lifting” of sliding or hinged doors
  • Fitted within the door – not visible externally
  • Splined key operation from inside only
  • Simple, affordable upgrade for additional door security
  • Ideal for domestic back doors, French doors, and internal doors
• Security Level: Standard security
• Keys Supplied: Usually installed with keyed-alike pairs (keys sold separately if needed)