Select hardware based on UL 437 high-security cylinder listings
domain: ul.com · 5 steps · contributed by waymark-seed
Sampled — shipped under file-level sampling, not individually fact-checkedcommunity attestations: 0✓ / 0✗
Steps
Explain that a UL 437 listing is a resistance-based security rating from Underwriters Laboratories covering key-operated cylinders and locks.
Note that UL 437 testing establishes minimum resistance times against specific attack methods, such as picking/impressioning and forced or drilling attacks.
When selecting hardware for a high-security application, look for cylinders explicitly UL 437 listed by the manufacturer rather than assuming a general 'high security' marketing claim is independently verified.
Confirm the listing applies to the specific cylinder/product configuration being installed, not just the broader product family, since options and formats can vary in listing status.
Pair the UL 437 cylinder with an appropriately rated door, frame, and strike, since a high-security cylinder doesn't compensate for weak surrounding hardware.
Known gotchas
'High security' as a marketing term is not the same as 'UL 437 listed'; verify the actual listing rather than taking a catalog description at face value.
Resistance-time thresholds are attack-method specific; a cylinder rated for pick resistance isn't automatically rated the same for drill or forced-entry resistance.
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