Good Price Manufacture Seal Supply 4mm Diameter Bolt Seal Seal Bolt Lock With Number Phone Mini Red Bolt Lock

Heavy-duty bolt seals are high-security, single-use tamper-evident locking devices designed for reliable cargo protection. Featuring a self-locking mechanism activated by simple finger pressure, they are manufactured from high-grade Q235A carbon steel (pin and bush) combined with durable ABS plastic, ensuring excellent strength and long-lasting performance. As a disposable security solution, these seals provide strong anti-theft, anti-counterfeiting, and tamper-resistant functions, making them widely used in logistics, container transportation, customs supervision, and high-value cargo protection. They are commonly applied for sealing shipping containers, oil and fuel tanker trucks, trailers, and other freight equipment requiring strict security control.

With factory-direct pricing, our bolt seals offer competitive cost advantages while supporting full customization options, including colors, logos, serial numbers, and barcode printing. Advanced laser marking technology ensures clear, permanent identification for traceability and supply chain management. Each product is packed using secure factory packaging, with customized packaging solutions available to meet different shipping and branding requirements. Fast delivery, stable quality, and consistent performance make them a reliable choice for global buyers.

Engineered for durability and tamper resistance, these high-security container seals feature a robust internal steel structure capable of withstanding strong pulling force and harsh handling conditions. Their tensile strength typically exceeds 700 kg, allowing them to perform reliably under extreme environments such as long-distance sea, land, and air transportation. The combination of hardened steel and protective ABS coating ensures resistance to corrosion, impact, and environmental stress, maintaining seal integrity throughout the logistics process.

As an essential component of modern cargo security systems, bolt seals provide a highly reliable barrier against unauthorized access and tampering. Their bolt-like structure fits securely into container locking points and can only be removed using bolt cutters, leaving clear and irreversible evidence once broken. This makes them the preferred solution for shipping companies, freight forwarders, and customs authorities handling high-value goods, hazardous materials, and international shipments requiring strict inspection and compliance.

Extensively used in shipping, intermodal transport, and logistics industries, these seals are designed to secure ISO-standard containers, trailers, trucks, van trucks, tank trucks, and railway wagons. They are also widely applied in postal services, courier systems, airline luggage handling, and equipment such as carts, trolleys, and food service units.

When applied to cargo trucks, trailers, and railway freight cars, these seals ensure cargo integrity and prevent unauthorized access during transportation. Their high-strength design enables them to perform reliably under challenging conditions, including long-distance transit and harsh environments.

Some advanced models integrate RFID chips or QR codes, allowing for remote reading, real-time tracking, and synchronization with GPS-enabled logistics systems. This provides enhanced visibility and traceability across the entire supply chain.

Constructed from hardened steel or Q235 steel combined with ABS plastic, these seals offer superior durability and tensile strength exceeding 700 kg. Each seal includes a unique laser-engraved serial number and a tamper-evident locking system, ensuring immediate detection of any breach attempts.

Types – Bolt Seals:
Bolt seals are among the most secure sealing solutions available, widely used in international shipping and high-security applications. Their solid construction and single-use locking mechanism make them highly effective for protecting valuable goods and ensuring compliance with strict logistics and customs requirements.

1.Q：What kind of company are we ?
A： Shandong Shengtang Intelligent Technology Co., Ltd. is a leading professional manufacturer of disposable security seals in China. Established in 2012, we have over 14 years of industry experience, supported by a 15,000㎡ modern factory, more than 200 skilled employees, and 450 advanced production machines, ensuring stable capacity and reliable global supply.Our main products include Plastic Seals, Bolt Seals, Cable Seals, Meter Seals, Padlock Seals, and Metal Seals Our products are exported to major global markets including Europe, North America, Southeast Asia, the Middle East, and South America.

2.Q：How can we guarantee products quality?
A: We implement a strict two-stage quality control system to ensure consistent and reliable product quality:
Pre-production samples are always provided for customer approval before mass production;
Final random inspection is conducted prior to shipment;

3.Q:what products can you buy from us?
A: We manufacture a full range of disposable security seals, including:
Plastic Seals, Cable Seals, Bolt Seals, Meter Seals, FRID Seals,Padlock Seals,Metal Strap Seals, Barrier Seals, Animal Ear Tags and others.
We also offer customized solutions, such as LOGO printing, laser serial numbering, barcodes, qrcode and special packaging if needed.

4. Q: Why should you buy from us not from other suppliers？
A：We have 14 years experiences, 300 sets of models with different styles , meet your different demands with fast delivery. All our material is environmental, and we won many honors from government.
We offer strong and flexible customization solutions for customers, helping customers create differentiated and competitive security seal products.
We have a comprehensive pre-sales service , In-Sales Service, and after-sales service system, to provide our customers with end-to-end services.

5.Q:Do you accept custom orders?
A: Yes. We provide comprehensive OEM & ODM customization services, including:
LOGO printing and unique serial numbering
Customized sizes, colors, materials, and packaging

6.Q:What certifications do you have?
A:We maintain a complete and internationally recognized certification system, including:
ISO 9001 – Quality Management System
ISO 14001 – Environmental Management System
ISO 45001 – Occupational Health & Safety Management System
ISO 17712 – High-Security Seal Certification
Third-party test reports from SGS and other authorized institutions