PDQ 429001 Exit Device Thru-Bolts for 4200 Series Panic Bars

The PDQ 429001 is a high-strength Exit Device Thru-Bolt Set specifically engineered to provide a secure, "sandwich-style" mounting for PDQ 4200 Series panic hardware. While many standard exit devices are surface-mounted with sheet metal screws, these high-intent fasteners are the professional solution for installations on non-reinforced hollow metal or wood doors. By passing entirely through the door and threading directly into the exit device chassis, these bolts eliminate the risk of hardware "pull-out," which is a common failure point in high-traffic school corridors and commercial exits.

This set of ten 1/4-20 machine screws serves as a critical security solution for facility managers looking to harden their door openings. In non-fire-rated applications, doors often lack the internal steel reinforcement required to hold standard screws under heavy use. Utilizing the PDQ 429001 Thru-Bolts ensures that the panic bar remains immovably anchored to the door, preventing the hardware from loosening over time due to constant vibration and physical abuse.

ANSI Function Summary: Structural Reinforcement for Egress

While thru-bolts are considered "mounting trim," they are essential for maintaining the ANSI/BHMA A156.3 standards for exit hardware durability.

• Anti-Pull Protection: These bolts prevent the exit device from being pulled off the door during a high-stress emergency egress or an attempted forced entry from the exterior.
• Chassis Stabilization: By clamping the device to the door face, the 429001 bolts ensure the internal timing and alignment of the latching mechanism stay precise, preventing the "binding" that often leads to door-closure failures.
• Security Integration: These fasteners are designed to be used on the exterior side with a sex-nut (sleeve) or compatible trim, leaving no exposed screw heads on the outside, which significantly reduces the risk of tampering or unauthorized removal of the hardware.

Technical Specifications

Solutions for Hardware Longevity and Safety

The PDQ 429001 Thru-Bolt Set addresses several critical infrastructure and safety challenges:

• Prevent Door Hardware Failure: On hollow metal doors without internal "closer reinforcement" or "tap plates," standard screws eventually strip the thin gauge steel. These thru-bolts provide a permanent mechanical bond that the door material alone cannot offer.
• Cost-Effective Maintenance: Replacing a damaged door due to stripped screw holes is an expensive and time-consuming process. Investing in a set of 10 thru-bolts during the initial installation or first maintenance cycle saves hundreds of dollars in future door repairs.
• Institutional Durability: In environments like universities or hospitals where doors are kicked or pushed open with carts, the 429001 fasteners distribute the force across the entire thickness of the door rather than a few threads of metal, doubling the life expectancy of the panic hardware.
• Simplified Retrofitting: If your current exit device is wobbling or pulling away from the door, these 1/4-20 machine screws allow for an immediate and secure fix, restoring the door to a safe, operable condition without needing to relocate the device.
• Professional Finish: Designed to match the industrial standards of the PDQ 4200 Series, these bolts ensure that the installation looks professional and meets the expectations of building inspectors and life-safety auditors.