Bolt Seals for Containers: When You Need ISO 17712 ‘H’ Security
In the world of international shipping, bolt seals are more than just locks — they’re your first line of defense against tampering and theft. But not every bolt seal qualifies as a high-security seal. To meet C-TPAT requirements, only ISO 17712 “H” certified bolt seals are acceptable. Here’s what you need to know.
What Are Bolt Seals?
Bolt seals are one-time-use locking devices consisting of a steel bolt and a locking body. They’re designed to secure the doors of shipping containers, trucks, and trailers by preventing unauthorized access during transit.
Unlike cable seals, bolt seals provide a rigid, tamper-evident closure that requires bolt cutters to remove. This strength makes them ideal for global container shipping.
Why ISO 17712 Certification Matters
ISO 17712 is the international standard that defines the strength and tamper-resistance of container seals. To be classified as “high security,” a bolt seal must meet strict testing requirements for:
- Tensile strength — resistance against pulling forces
- Bending strength — ability to withstand leverage attacks
- Impact resistance — protection from hammering or crushing
- Shear strength — resistance against cutting tools
Only seals passing these tests are marked with an “H” for High Security.
When Do You Need ISO 17712 ‘H’ Bolt Seals?
You’ll need ISO 17712 bolt seals when:
- You’re exporting goods in ocean shipping containers
- You must comply with C-TPAT (Customs-Trade Partnership Against Terrorism) or ISPS Code regulations
- Your cargo is high-value or sensitive and requires maximum security
- Customs agencies in the U.S. or EU require proof of tamper-evident, high-security sealing
Without an “H” rated seal, your shipment may face delays, extra inspections, or even rejection at port.
Key Features of ISO 17712 Bolt Seals
- Laser-etched serial numbers: Ensures traceability and prevents substitution
- One-time use: Must be cut off with bolt cutters
- Steel core with ABS coating: Combines strength with tamper-evidence
- Custom branding options: Logos, barcodes, or QR codes for supply chain tracking
- “H” marking: Proof of ISO 17712 high-security certification
Bolt Seals vs. Cable Seals
Both bolt seals and cable seals can meet ISO 17712 “H” requirements, but they have distinct strengths:
| Feature | Bolt Seals | Cable Seals |
|---|---|---|
| Structure | Rigid steel bolt | Flexible steel cable |
| Removal | Bolt cutters only | Cable cutters |
| Use Case | Shipping containers, trucks, trailers | Tankers, containers, varied locking points |
| Security Rating | ISO 17712 “H” available | ISO 17712 “H” available (at 5mm+) |
FAQs: Bolt Seals and ISO 17712
How do I know if a bolt seal is ISO 17712 compliant?
Check for the “H” mark and request the manufacturer’s ISO 17712 test certificate. The seal should also have a unique, non-duplicated serial number.
Can bolt seals be reused?
No. Bolt seals are single-use only. Once cut, they must be discarded.
Are bolt seals required for all containers?
Yes, for international container shipping. U.S. CBP and many customs authorities mandate ISO 17712 high-security seals for containers.
Conclusion: Don’t Risk Your Shipment with the Wrong Seal
For global container shipping, a regular lock won’t cut it. You need ISO 17712 “H” bolt seals to meet C-TPAT standards, protect cargo integrity, and prevent costly delays at customs. Choosing the right seal isn’t just about compliance — it’s about protecting your bottom line.
Contact Acme Seals to source ISO 17712-certified bolt seals that meet the strictest international requirements.