Import Bolt Seals — Buy in wholesale FOB from Supplier in China

Wenzhou E-sun Container Accessories Co., Ltd. manufactures bolt seals from hardened steel with a zinc-plated or powder-coated finish, designed for tamper-evident security on intermodal shipping containers, trailers and railway cars. The seals incorporate a spring-loaded locking mechanism and unique serial numbering for traceability, and are built to satisfy ISO 17712 high security standard requirements. Each unit provides visible evidence of unauthorised access once broken, making it a regulatory staple for customs documentation on major international shipping lanes.

The body is formed from hardened steel to resist cutting and forced entry, while the zinc-plating or powder-coating layer protects against corrosion during extended ocean transit. The spring-loaded locking pin engages irreversibly with the barrel, so the seal pawn cannot be reinserted once severed. Serial numbers are typically laser-etched or hot-stamped for permanent readability. Standard shaft dimensions in the industry run an 8 mm diameter with a 74 mm height, though buyers should confirm exact measurements with the supplier. Colours can usually be specified to match logistics company branding or customs lane coding.

These seals are purchased by freight forwarders, shipping lines, customs brokers and large exporters who need compliant container closure for C-TPAT, AEO and similar supply chain security programmes. They are applied at origin warehouses, port terminals and inland container depots. Buyers should verify tensile strength ratings, ISO 17712:2013 classification (indicative, high security or security) and whether the supplier provides conformance certificates from accredited laboratories. Packaging and MOQ details must be confirmed directly with Wenzhou E-sun Container Accessories Co., Ltd.

Wenzhou E-sun Container Accessories Co., Ltd. is located at 603 Mechanical Building, Liming Road (West), Wenzhou, Zhejiang Province, 325000, China. The company holds a harbor trust tier on the platform, with a published response rate of 0.00 percent and an average response time of zero hours, which indicates that direct enquiry will be necessary to gauge communication reliability. No verified export revenue, employee headcount or factory floor area is stated in the available profile, so buyers should request audited business registration and ISO certification copies during due diligence.

The listing presents bolt seals for intermodal security applications and references ISO 17712 compliance, though the profile does not name a specific certifying body or certificate expiry date. Buyers should ask for the latest ISO 17712 test report, the laboratory accreditation (such as ISO/IEC 17025), and sample serial number logs to confirm traceability protocols. The supplier's physical address in Wenzhou, a recognised hub for Chinese hardware and container accessory manufacturing, may support site visits for buyers seeking first-party verification.