Best High-Security Padlock for Marine Environments
Best High-Security Padlock for Marine Environments
Securing equipment in coastal environments is challenging. Salt, humidity and constant weather exposure can quickly corrode ordinary padlocks. When high security and long-term durability are required, the Abus Granit 37ST/55 is a strong and reliable option designed specifically for harsh marine conditions.
Why the Abus 37ST/55 Stands Out
The Abus 37ST/55 is the marine-grade model in the Granit high-security range. It is constructed with a stainless steel body, a 12mm stainless steel shackle and non-corrosive internal components. This makes it suitable for use on coastal farms, harbours, marinas and any outdoor site exposed to salt and moisture.
Stainless steel resists corrosion effectively, but it can sometimes be softer than hardened steel. Abus use an optimised stainless steel alloy to balance corrosion resistance with physical strength. The 37ST/55 also carries a CEN 4 security rating, meaning it offers strong resistance to cutting and physical attack.
Keying Options and SZP Restricted Keyway
The 37ST/55 uses the Abus Plus key system, which is known for being highly resistant to picking.
The keyed alike version uses the SZP restricted keyway, preventing unauthorised key copying.
If you already use Granit padlocks, keyed alike versions can be matched to your existing suite.
Note that older Plus keys will not operate SZP versions, but the improved key control is often worth the change.
The keys are also non-directional, making them easier to use in low light, and one key is supplied with a built-in LED.
Best Use Cases
• Boat yards, harbours and dockside storage
• Coastal farms and remote agricultural sites
• Marine equipment lockers and compounds
• External gates, fuel stores and machinery sheds in salt atmosphere zones
Summary
The Abus Granit 37ST/55 provides a strong balance of physical security and salt-corrosion resistance, making it one of the most effective padlocks for coastal and marine sites. It is suitable for environments where standard weatherproof padlocks fail.