GlossaryEN1 min readUpdated: Jun 25, 2026
Lock Bolt Security Seals for Container Freight
Bolt security seals differ from cable or wire seals in one critical respect: they are single-use, tamper-evident locking devices made of hardened steel or aluminium that fit into the locking rod eyes of container doors and provide substantially higher resistance to forced entry.
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Source: https://www.iso.org/standard/55048.html
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Bolt security seals differ from cable or wire seals in one critical respect: they are single-use, tamper-evident locking devices made of hardened steel or aluminium that fit into the locking rod eyes of container doors and provide substantially higher resistance to forced entry. ISO 17712 classifies them as high-security seals, setting minimum standards for tensile strength, cutting resistance, and mandatory marking. Freight forwarders, shippers, and customs terminals treat them as standard practice in international containerized trade. Customs authorities worldwide recognize ISO 17712-compliant seals; intact seals typically reduce inspection frequency and speed up clearance. Any tampering attempt leaves irreversible visible damage, creating a clear audit trail for the shipment. Cable seals, by contrast, are generally approved only for secondary closures or lower-risk cargo.
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