DISEC STONE Rok Sferik BD131-25D1 mechanical Euro cylinder protector for compatible ATRA/DIERRE locks with 31 mm fixing centres. Carbonitrided steel body with hemispherical profile and anti-pull edge, 85 × 68 mm escutcheon and M6 Flex System mounting. Grade 4 burglary resistance declared by DISEC. Offered in bronze and polished brass.
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The DISEC STONE Rok Sferik BD131-25D1 is a mechanical security protector for Euro profile cylinder locks with compatible ATRA/DIERRE mounting arrangements. Manufactured from carbonitrided steel, it features a hemispherical profile and an anti-pull edge, designed to resist cylinder breaking, extraction and drilling attempts. DISEC specifies grade 4 burglary resistance.
The hemispherical profile reduces exposed gripping surfaces for tools used during forced-entry attempts. The anti-pull edge provides an additional structural feature to resist forces applied when attempting to remove the protector.
The Flex System uses reinforced fixing screws to improve mounting resistance compared with conventional fasteners. The front key opening allows normal insertion and operation of the cylinder key.
| Type | Hemispherical anti-pull mechanical protector |
|---|---|
| Application | Euro cylinder – ATRA/DIERRE mounting arrangement |
| Protector material | Carbonitrided steel |
| Dimensioned circular envelope | Ø54 mm |
| Escutcheon dimensions | 85 × 68 mm |
| Overall projection | 27 mm |
| Nominal size | 25 mm |
| Fixing centres | 31 mm |
| Fixing thread | M6 |
| Mounting system | Flex System |
| Additional protection | Anti-pull edge |
| Burglary resistance grade | 4 |
| Orderable finishes | Bronze, polished brass |
The BD131-25D1 is intended for compatible ATRA/DIERRE locks with 31 mm fixing centres. It differs from the BD121 model, which uses standard 38 mm fixing centres.
Before installation, check the cylinder position relative to the external door panel, the escutcheon clearance and the fixing-hole arrangement. Compatibility must be assessed according to the actual lock model.
A DISEC cylinder protector spacer is also listed in the Matteoda catalogue and can be ordered separately. Its suitability must be confirmed for the specific installation.
Before ordering: check the ATRA/DIERRE mounting arrangement, 31 mm M6 fixing centres and protector dimensions against the existing door. Contact Matteoda customer service for technical assistance and estimated delivery times.
Specific References
Reference: 708.0843120
Brand: DiSec
Reference: 708.0843254
Brand: DiSec
Reference: 708.0843002
Brand: DiSec
Reference: 708.0843151
Brand: DiSec
Reference: 708.0843130
Brand: DiSec
Reference: 708.0843074
Brand: DiSec
Reference: 708.0843355
Brand: DiSec
Reference: 708.0843015
Brand: DiSec
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DISEC STONE Rok Sferik BD131-25D1 mechanical Euro cylinder protector for compatible ATRA/DIERRE locks with 31 mm fixing centres. Carbonitrided steel body with hemispherical profile and anti-pull edge, 85 × 68 mm escutcheon and M6 Flex System mounting. Grade 4 burglary resistance declared by DISEC. Offered in bronze and polished brass.
