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Views: 0 Author: sunny yu Publish Time: 2025-07-22 Origin: Site
Let’s talk about something small but absolutely mighty in the world of strapping things together: Steel Seals.
Think about it. You spend time and money bundling up pallets of goods, securing massive steel coils, or locking down valuable machinery for shipping. You use strong steel strapping, tension it perfectly... but what stops it all from just unraveling the second it hits a bump or gets jostled? That tiny, often overlooked hero: the Steel Seal.
At Juhong Packing Materials, we live and breathe load security. As a leading manufacturer of PET Strapping and Steel Strapping, we know that top-quality seals are your ultimate trusted partner.
Expert Quote: "A strapping system is only as strong as its joint." As the Lead Drafter of China National Standard GB/T 39040-2020, Juhong Packing defines the critical factors that determine the integrity and safety of your strapping seals.
Steel seals also known as metal seals,Strapping Seals.are metal fasteners precision-stamped from high strength steel,Their primary function is to securely clamp and interlock the two overlapping ends of strapping material.Unlike traditional rubber or plastic seals, steel seals are designed to withstand higher pressures, temperatures, and corrosive environments, maintaining their integrity over time. They act as barrier components, preventing leaks and contamination in essential machinery.
Key features of steel seals include:
High tensile strength
Resistance to corrosion and rust
Excellent mechanical stability
The ability to operate in harsh environments
Steel seals are predominantly made from:
Carbon Steel: Offers excellent strength and durability for most applications. Often galvanized or coated for corrosion resistance.
Stainless Steel: Essential for highly corrosive environments (chemical industry, marine applications, food processing) or where hygiene is critical. Grades like 304 or 316 are common.
Aluminum: Used for lighter-duty applications where corrosion resistance is needed but extreme tensile strength is less critical. Lighter weight can be an advantage.
Steel, being both hard and flexible when properly manufactured, makes an ideal material for a wide variety of sealing needs.
In industrial packaging, "integrity" is measured by Joint Efficiency. It is the most critical technical metric for any banding clip or metal strap fastener.
The Global Standard: According to GB/T 39040-2020, ASTM D3953 (US), and EN 13246 (Europe), a professional-grade joint must achieve a Joint Efficiency of ≥ 75% of the strapping's minimum breaking strength.
Why 75%? This benchmark ensures that the joint can withstand the dynamic forces of maritime transit and rail vibrations without slipping or snapping.
It is mainly divided into ordinary Steel Seals, which are generally used for manual packaging and are suitable for plastic strapping and steel strapping. Magazine seal are generally used for Fully automatic steel strapping machine and special seals.
Serrated Seals、Push-type Seals、Snap-on Seals、Open-flange Seals、Thread-on Seals
Coated Seals:
Galvanized, painted, or polymer-coated for enhanced corrosion resistance in harsh environments (chemical plants, outdoor storage, marine transport).
These are specially designed to work with the full automatic packing machinehevare mainyusedin nonferrous metaandferrous meta onine automaticpacking under high temperature.
Pre-Printed / Embossed Seals:Feature company logos, identification numbers, barcodes, or safety messages for branding, traceability, or compliance purposes.
Choosing the right strapping seal depends entirely on your application and tools.
Designed for high-performance applications, these are the "lasso" experts. The strap is threaded through the pusher seal before tensioning, making them the best choice for round or irregular shaped packages like steel coils, pipes, and coiled rods.
hese seals are precision-stacked for use in seal-feed combination tools and power strapping machines. Juhong’s magazine seals are engineered with strict dimensional tolerances to prevent tool jamming—a common bottleneck in automatic packaging lines.
Steel seals offer unmatched benefits that make them indispensable in many industries:
Durability: Resisting wear, tear, and impact, steel seals last longer than many alternatives.
Corrosion Resistance: Depending on the alloy, they withstand saltwater, acids, and other corrosive substances.
High-Temperature Tolerance: Steel can withstand extreme heat, making it suitable for engines and industrial machinery.
Reusability: Many steel seals can be removed and reused without losing their effectiveness.
If you’re seeking reliable sealing solutions that won’t let you down, JUHONG steel seals are often the best choice.
We don't just claim quality; we prove it. Our in-house facility performs rigorous Tensile Strength Tests on every batch.
By monitoring the exact point where the metal clip or strap fails, we ensure that our products provide a safety margin that exceeds international industrial mandates.
Apart from joint strength, thickness consistency is the backbone of strapping seal reliability. If a metal strap fastener is too thin, it loses its grip; if it’s too thick, it will cause expensive tool jamming in automatic machines.
Precision matters: Our quality control team uses calibrated instruments to verify that every strapping seal batch
maintains strict thickness consistency, preventing tool jamming and ensuring reliable joint integrity.
Our Testing Protocol: Our engineers use calibrated digital micrometers to perform random sampling throughout the production cycle.
The Juhong Standard: While many suppliers have loose tolerances, we adhere to the ±0.035mm thickness tolerance defined in the GB/T 39040 , ASTM D3953 (US), and EN 13246 (Europe) national standard we helped draft. This precision ensures that our magazine seals feed smoothly into your power strapping tools every single time.
Steel Strapping seals are versatile and It is widely used, mainly for plastic strapping (PP/PET), or used in conjunction with steel strapping.
Steel seals are the unsung heroes ensuring integrity wherever heavy-duty strapping is employed. Their applications are vast:
1. Pallet Unitization
Preventing boxes and goods from shifting or falling off pallets during forklift handling, trucking, and ocean transport. Interlock and crimp seals are prevalent
2. Container Securing
Locking steel strapping securing cargo inside shipping containers. Heavy-duty crimps or bolt seals are used. Crucially, high-security bolt seals are mandatory for sealing the actual doors of ISO shipping containers.
3. Dunnage & Bracing
• Securing dunnage bags, airbags, or wooden bracing used to immobilize cargo within trailers or containers. Crimp seals are typical.
And when it comes to sourcing top-tier steel seals,JUHONG provides trusted, high-quality products tailored to these demanding applications.
Securing stacks of lumber, plywood, and other timber products for transport and storage. Heavy-duty crimp seals are standard.
Critical for securing massive coils of steel, aluminum, and copper for transport and storage. Failure is catastrophic. Extra-heavy-duty crimp seals are essential, applied with powerful pneumatic or battery tools. Seals must withstand coil "spring back" forces.
Bundling lengths of pipe (steel, PVC, concrete) or tubing. Crimp seals are predominant, sized for the strapping gauge needed.
Securing large machines, industrial equipment, or components onto skids or within crates for shipping. Heavy-duty crimps or bolt seals provide security.
• Securing large, heavy rolls of paper, newsprint, or cardboard. Heavy-duty crimp seals are standard.
The manufacturing process involves several precise steps:
Material Selection: Choosing the right alloy (stainless steel, carbon steel, etc.) based on application needs.
Manufacturing Techniques: Processes like stamping, machining, or casting shape the steel into the desired seal form.
Quality Assurance: Each seal undergoes rigorous testing for pressure resistance, dimensions, and material integrity.
This meticulous process ensures that every steel seal performs perfectly under the toughest conditions.
Consider these factors meticulously:
Strapping Compatibility: Width? Thickness (gauge)? Tensile Strength? This is non-negotiable.
Required Security Level: Standard duty? Heavy duty? Tamper evidence? High security ?
Environmental Conditions: Exposure to moisture, chemicals, salt, extreme temperatures? (Dictates material: Galvanized, Stainless, Coated).
Regulatory Requirements: ISO for Steel Seals? Industry-specific standards? Customer specifications?
OEM Needs: Pre-printed logos?
If you’re uncertain, consulting with a specialist or supplier like JUHONG can help you make the right choice.
When you source metal strap seals, you are buying peace of mind. Juhong’s "Triple Compliance" strategy ensures your cargo is accepted in any global port:
GB/T 39040-2020: We wrote the rules for China's national strapping seal quality.
ASTM D3953: Fully compliant for North American heavy-duty industrial bundling.
EN 13246: Optimized for European tensional strapping requirements and maritime safety.
Correct application is non-negotiable for achieving the required security. Using the right tools and technique is paramount.
1. For Ordinary Steel Seals:The commonly used ones are Serrated Seals、Push-type Seals
• Manual Strapping Tool: For light-duty applications and low volume. Choose pliers exactly matched to the seal size.
• Pneumatic Strapping Tools: driven by electricity, automate tightening and sealing. They're faster and boost efficiency, ideal for large - scale operations like in logistics centers or factories. Choose based on your needs. If you have a small workload and a tight budget, a manual tool may be enough. But for frequent, heavy - duty work, a powered one is a better long - term investment, despite the higher cost.
2.For Magazine Steel Seals：come pre-loaded in cartridges/strips for rapid, automated application. Unlike loose seals, they eliminate manual handling—slashing application time by 30%+ while boosting safety on high-volume lines.
Steel seals are far more than just simple metal clips. They are the critical, final component in a secure bundling system, bearing the responsibility of maintaining tension and preventing catastrophic load failure. their specific applications across logistics, construction, and heavy industry is essential. Crucially, mastering the correct application techniques using the proper tools is non-negotiable for safety and reliability.
As a leading Chinese manufacturer deeply invested in the science of secure bundling – producing high-quality PET Strapping, Steel Strapping, and Steel Seals – we emphasize that load security is a system. The strap provides the strength, but the seal provides the guarantee. Choosing the right seal, applying it correctly, and adhering to best practices and standards like ISO ensures your loads arrive intact, protects your assets, safeguards personnel, and upholds your reputation. Don't let your security be the weakest link. Invest in the right steel seal solution.
Juhong Packing Materials' 2026 Brochure.pdf
A: It means our factory is the benchmark for the entire industry. When you buy from the standard drafter, you get strapping seals with verified material hardness and joint efficiency that trading companies cannot guarantee.
A: Yes. Both ASTM D3953 and GB/T 39040-2020 require a minimum 75% Joint Efficiency. Juhong seals are engineered to meet both, making them a "universal" solution for global exporters.
A: While you can, Snap-on (Open) seals are more efficient for flat surfaces. Overlap seals are specifically optimized for round objects like pipes or coils where a "lasso" loop is required for secure tensioning.
A: We use high-grade galvanization and specialized painting treatments. Our seals are tested for 72+ hours in salt spray, ensuring the strapping seal integrity is not compromised by corrosion during long-distance maritime transit.
A: Reliability. Our magazine seals are precision-stamped to ensure they don't jam in automatic tools. This reduces downtime and maintenance costs for heavy-duty industrial operations.
Explore our full range of Overlap, Magazine, and Snap-on Seals designed for the most demanding industrial environments. All Juhong products are engineered to exceed ASTM D3953 and EN 13246 international standards.
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