heavy duty gay 4 digits code combination padlock|TSA Approved Luggage Locks for Secure Travel & Gym Use

Heavy duty 4 digits code combination padlock is a robust, keyless security device designed for high-security, high-traffic applications—such as securing shipping containers, construction site gates, industrial storage units, warehouse doors, or agricultural equipment sheds—where resistance to forced entry, harsh conditions, and heavy use is non-negotiable. Manufactured by Shanghai Kuntu Industrial Co., Ltd.—a BSCI-certified company with over 20 years of experience in producing industrial-grade security products—this padlock is engineered with thick, wear-resistant materials, a tamper-proof 4-digit combination mechanism, and reinforced structural design to outperform standard padlocks in demanding environments. It caters to global clients including logistics firms, construction companies, manufacturing plants, and farms that need reliable, low-maintenance security without the risk of lost keys. Real-world applications highlight its durability and reliability across industries. For a logistics company operating 500 shipping containers across ports in Los Angeles, USA, Kuntu’s heavy-duty 4-digit combination padlocks are a critical part of daily operations. Each padlock secures the container’s hasp, with the 4-digit combination (offering 10,000 unique combinations) shared only with authorized drivers and warehouse staff. The padlock’s body is crafted from 304 stainless steel, 12mm thick, which resists corrosion from saltwater air at the port—unlike standard zinc alloy locks that rust within 6 months. The shackle is 10mm hardened steel, heat-treated to resist cutting with industrial bolt cutters (a common tool used in cargo theft). After 2 years of use, the company reports zero lock failures or security breaches, and the combination mechanism still operates smoothly despite exposure to rain, dust, and constant handling. On a construction site in Dubai, UAE—where temperatures reach 50℃ in summer and sandstorms are frequent—Kuntu’s padlocks secure tool storage trailers and site gates. The lock’s combination dial is sealed with a silicone gasket to keep out sand, and the body is coated with a heat-resistant powder finish that prevents warping in extreme heat. Construction managers set a single 4-digit code for the site team, eliminating the need to distribute and track dozens of keys, and the padlock’s large, raised numbers make it easy to operate while wearing work gloves. For a farm in Iowa, USA, the padlocks secure grain storage bins and equipment sheds, withstanding freezing winters (-20℃) and humid summers. The internal components are lubricated with winter-grade grease that doesn’t harden in cold weather, ensuring the combination dial turns smoothly year-round, and the shackle’s large opening (35mm) fits over the thick hasps of farm equipment sheds. Kuntu’s heavy duty 4 digits code combination padlock is built with industrial-grade features to ensure longevity and security. The lock body is available in two premium materials: 304 stainless steel (for maximum corrosion resistance, ideal for coastal or humid areas) and carbon steel with a hot-dip galvanized finish (for cost-effective durability in dry, inland regions). Both options have a minimum thickness of 10mm, with reinforced corners to resist prying with crowbars or screwdrivers. The 4-digit combination mechanism uses precision-machined brass tumblers that are resistant to “code fishing” (a technique used to guess combinations by feeling tumbler clicks) and can be reset in 60 seconds using a simple tool-free process—critical for sites where staff changes occur frequently. The shackle is made of hardened steel (Rockwell hardness 50-55), 8mm-12mm thick, with a double-locking design that engages at both ends of the shackle, preventing it from being forced open. All models meet international security standards, including ANSI/BHMA A156.30 Grade 3 (for heavy-duty padlock performance) and EN 1300 (for durability), ensuring they withstand 10,000+ cycles of opening and closing. For clients with specific needs—such as custom shackle lengths (up to 50mm) for extra-thick hasps, or key override options for emergency access—Kuntu’s R&D team can develop tailored solutions, supported by the foreign trade team’s expertise in navigating global compliance (e.g., ISO 9001 quality standards). As pricing varies based on material, shackle thickness, and order quantity, please contact our foreign trade team for a personalized quote, along with samples to test against your site’s specific conditions.