The Alarm Controls AM3305 is a 5/8" drop-down spacer plate for the 600 Series single magnetic lock family. Use it when the door top rail, header profile, or existing frame prep doesn't give the mag body enough clearance to sit flush against the header while still aligning to the armature on the door.
When to reach for a spacer
Single mag locks need the magnet face and the armature face to meet in-plane on close. On thin top rails, deep-set stops, or retrofit openings where the header is out of true, the mag can sit too high above the armature to make full contact. The AM3305 drops the mag 5/8" below the header so the armature engages at full holding force instead of a partial bond.
Key details
- 5/8" spacer thickness ā the middle option in the 600 Series spacer family
- Fits the 600 Series ā 600S standard, 600L, and 600LB (with LED, bond sensor, door status)
- Clear anodized (US28) finish to match the standard 600 Series housing
- Bracket footprint matches the lock at 9-7/8" L x 1" W, so it disappears behind the mag body on install
Sibling spacers
If 5/8" is too much or too little, the 600 Series family offers thinner spacer options: AM3300 (1/2") and AM3330 (1/4"). Contact your SS&Si sales rep to add either to the order ā same install pattern, different drop depth.
Building the full opening from scratch? Start with the Alarm Controls 600S single magnetic lock.
When do I need a spacer plate for a mag lock?
Which mag locks does the AM3305 fit?
Does the AM3305 change the holding force of the mag lock?
Is this the same finish as the standard 600S housing?
What is the difference between AM3300 and AM3305?
Product Manual
