Sold Secure SS312 Sold Secure cylinder scheme (Bronze, Silver, Diamond)
An independent testing scheme for cylinders. Diamond passes attack tests beyond what TS007 3-star covers and is referenced by Secured by Design.
What it actually decides
- Attack resistance beyond TS007
- Recognition by police Secured by Design schemes
- Often required alongside or instead of TS007 by insurers
Applies to these lock types
UK oval cylinder (uPVC and composite doors) · Euro profile cylinder in a mortise case (DIN)
Why a retrofit designer cares
Two certification marks can appear on one cylinder. Record both — they are not interchangeable.