DISEC MAG 3G 3G3FM-25D1 – Magnetic Euro Cylinder Protector for ATRA/DIERRE Locks
The DISEC MAG 3G 3G3FM-25D1 is a magnetic security protector for Euro profile cylinder locks with compatible ATRA/DIERRE mounting arrangements and 31 mm fixing centres. Its rotating magnetic cover restricts direct access to the keyhole, adding a protective barrier against attempted cylinder manipulation.
MAG 3G magnetic locking mechanism
The protector features a rotating magnetic cover operated by a dedicated coded magnetic key. Once the cover has been unlocked, the standard Euro cylinder key can be inserted and used to operate the lock.
The magnetic security mechanism operates independently of the cylinder's mechanical keying system. The magnetic key controls the protector only and does not replace the door key.
Monolito construction and mechanical protection
The Monolito MAG 3G configuration combines the protective body and external escutcheon into an integrated assembly, reducing accessible gripping points for tools used in removal attempts.
When closed, the magnetic cover restricts access to the cylinder keyway and helps resist manipulation attempts. Overall protection also depends on the lock design and correct installation.
Dimensions and technical specifications
| Type | Rotating magnetic Euro cylinder protector |
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| Mounting arrangement | Compatible ATRA/DIERRE locks |
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| Overall dimensions | 88 × 68 mm |
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| Dimensioned outer diameter | Ø54 mm |
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| Nominal size | 25 mm |
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| Fixing centres | 31 mm |
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| Fixing thread | M6 |
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| Rotor configuration | D1 |
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| Key opening height | 5 mm |
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| Locking mechanism | Rotating magnetic cover |
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| Operation | Coded magnetic key |
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| Magnetic keys included | 2 |
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| Orderable finishes | Bronze, polished brass |
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Compatibility and installation
The 3G3FM-25D1 is intended for Euro profile cylinder locks with 31 mm ATRA fixing centres. This arrangement differs from the 3G2FM version, which uses 38 mm fixing centres.
Before replacing an existing protector, check the M6 fixing-hole positions, cylinder projection relative to the external door panel, mounting depth and clearance required for the external escutcheon.
Before ordering: verify the 31 mm fixing centres, cylinder configuration and compatibility with the existing lock. Contact Matteoda customer service for information about orderable finishes and estimated delivery times.
