DISEC MR503F-25D1 – Magnetic Euro Cylinder Protector for ATRA/DIERRE Locks
The DISEC MR503F-25D1 is a magnetic security protector for Euro profile cylinder locks with compatible ATRA/DIERRE mounting arrangements and 31 mm fixing centres. It combines a magnetic-key-operated keyhole cover, a self-adjusting spring-loaded anti-pull plate and a satin stainless steel front. The device provides an additional physical barrier and restricts direct access to the cylinder keyway.
Magnetic protection mechanism
When closed, the magnetic system covers access to the cylinder keyway. The dedicated DISEC magnetic key unlocks the protector, allowing the normal Euro cylinder key to be inserted and operated.
This arrangement helps restrict direct manipulation of the cylinder. The magnetic key operates the protective device independently of the mechanical key used to unlock the door.
Spring-loaded anti-pull protection
The self-adjusting spring-loaded anti-pull plate provides an additional protective feature against attempts to remove the cylinder guard. The assembly includes a satin stainless steel front and an oval external escutcheon covering the fixing area.
The MR503F uses 31 mm fixing centres for ATRA mounting arrangements, unlike the MR500F version, which uses 38 mm fixing centres.
Dimensions and technical specifications
| Type | Magnetic Euro cylinder protector |
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| Mounting arrangement | Compatible ATRA/DIERRE locks |
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| Outer body diameter | Ø54 mm |
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| Front diameter | Ø50 mm |
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| Dimensioned inner diameter | Ø46 mm |
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| Escutcheon dimensions | 88 × 68 mm |
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| Dimensioned overall depth | 27 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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| Anti-pull system | Self-adjusting spring-loaded plate |
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| Front component | Satin stainless steel |
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| Operation | Dedicated magnetic key |
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| Keys supplied | 2 magnetic keys |
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| Orderable finishes | Satin chrome, bronze, polished brass |
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Lock compatibility and installation
The MR503F-25D1 is designed for Euro cylinder locks with compatible ATRA mounting arrangements and 31 mm fixing centres. Before installation, check the lock model, cylinder position, M6 fixing-hole alignment and clearance required for the external escutcheon.
The nominal 25 mm protector size must also be checked against the cylinder position within the external door panel.
Before ordering: verify the 31 mm M6 fixing centres and compatibility with the existing lock. Contact Matteoda customer service for technical assistance, finish selection and estimated delivery times.
