RCI ARMB255 Armature Bolts, 2-1/8" (55mm) for Doors 1-3/4"-2-1/4" (44-57mm) Thick

Ensure reliable, secure locking performance with the RCI by dormakaba ARMB255 armature bolt — a purpose-built magnetic lock part that delivers consistent contact and durability for access control systems. Engineered for doors 1-3/4"–2-1/4" (44–57 mm) and sized at 2-1/8-inch (55 mm), this armature bolt simplifies installation and ensures the proper gap and alignment needed for peak holding force and accurate monitoring.

Manufactured to pair with RCI electromagnetic locks (compatible with models 8320, 8320-IQ and 8372), the ARMB255 reduces troubleshooting and service calls by maintaining a stable interface between the armature plate and lock. Available in black and silver finishes, it resists corrosion and integrates cleanly with existing door hardware, preserving aesthetics while supporting long-term security performance. Ideal for system integrators, facility managers and security professionals, this armature bolt supports magnetic lock installations, surveillance-backed access control, and monitoring setups where reliability matters.

Upgrade or replace worn fasteners to optimize your magnetic lock system — add the ARMB255 to your next access control or security retrofit and order today.

• Provides secure, consistent armature contact for magnetic locks to improve access control reliability and reduce false alarms
• Designed for doors 1-3/4"–2-1/4" (44–57 mm), with a 2-1/8-inch (55 mm) length for easy fit on standard door thicknesses
• Direct compatibility with RCI models 8320, 8320-IQ and 8372 for fast, low-risk replacements and retrofits
• Durable black and silver finish options to resist corrosion and blend with door hardware for long-term performance
• Simple installation cuts service time on-site, helping integrators and facilities teams minimize downtime
• Engineered as a magnetic lock part to support security, surveillance and monitoring systems in commercial environments