Security

    Choosing the Right Seal Length for Secure Logistics: A Guide to 100mm to 700mm Security Straps

    Seals Shipping Admin
    January 2, 2026
    0 Comments

    Professional auto transport carrier delivering vehicles cross-country safely.

    In logistics, precision is everything. Choosing the wrong security seal length can lead to vulnerabilities, allowing for prying tools to gain leverage or causing the seal to rattle and fail. Our guide covers the technical metrics from 100mm to 700mm.

    The Metrics of Security

    Security seals are measured primarily by their "Usable Length"—the actual working circumference of the strap once locked. Selecting the right size ensures a flush fit against the locking hasp.

    Length (mm)CategoryCommon Application
    100mm - 200mmShortTotes, Car Keys, Small distribution boxes
    250mm - 400mmStandardBox truck doors, Tanker valves, Toolboxes
    500mm - 700mmLongShipping containers, Car carrier trailers

    Why Length Matters

    A seal that is too long creates "slack." This slack allows a potential thief to insert a screwdriver or prying tool to manipulate the locking mechanism without breaking the seal body.

    Industrial Application Guide

    At Seals Shipping, we use these metrics to determine the security profile of every vehicle transport route.

    Recommended Lengths by Use Case

    150mm: Ideal for securing vehicle key pouches during transport
    300mm: Standard for domestic car-hauling trailer gear lockers
    500mm+: Necessary for multi-point locking rods on enclosed carriers
    Custom Lengths: Used for oversized cargo and industrial heavy-haul

    Expert Tip

    If you're unsure of the length, choose an Adjustable Cable Seal. They provide the same security as a fixed-length seal but allow you to cinch the loop as tight as possible.

    Conclusion

    Technical precision in hardware selection is what separates amateur logistics from professional asset protection. Ensure your shipment is "sized" for security.

    FAQs About Auto Transport

    Q.Why does security seal length matter in logistics?

    The length determines application compatibility. Short seals (100-200mm) are for small latches, while long seals (500-700mm) are essential for securing multi-point container doors.

    Q.What is a 100mm security seal best used for?

    100mm seals are ideal for small items like car key pouches, document bags, or small distribution boxes where space is limited.

    Q.When should I use a 700mm security strap?

    700mm straps are required for heavy-duty applications like securing whole car carrier trailers or maritime containers where a large circumference is needed.

    Q.Are longer security seals easier to break?

    No, the breaking strength depends on the material (metal vs plastic) and core thickness, not the length of the strap.

    Q.Can I customize the serialized numbers on any seal length?

    Yes, at Seals Shipping, we provide custom serialization and barcodes for all seal lengths from 100mm to 700mm.

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