oem rectangular tin box is a customized hinged rectangular metal tin box with professional OEM private labeling service. It focuses on high-precision inner wall craftsmanship and stress-optimized opening angle, supporting customized packaging solutions for stationery storage, food packaging, gift packing, cosmetic accessories and hardware parts. We provide one-stop OEM services including mold opening, surface printing, inner wall customization and opening angle adjustment for cross-border traders, brand owners, gift companies and packaging manufacturers. Most ordinary OEM rectangular tin boxes only focus on delicate outer printing but ignore inner wall quality. Equipped with non-adjusted universal opening angles unsuitable for long rectangular box structure, they suffer from common defects: peeling inner paint, scratch damage to stored goods, sharp inner burrs, easy oxidation, blocked inner storage space, sliding contents and fragile hinges. These poor quality problems lead to numerous customer complaints and high rework costs for bulk OEM orders.

　　Meeting strict quality standards of bulk OEM orders, this oem rectangular tin box adopts four upgraded inner wall treatments to fix inner workmanship defects of ordinary customized tin boxes, and supports personalized inner wall customization to meet diverse demands of different industries. Firstly, thickened original tinplate substrate. Recycled mixed iron sheets are completely abandoned. The uniform inner wall material has no pits or flaws, featuring strong bending resistance and rust resistance. It adapts to long-distance marine transportation and humid warehouse storage, preventing inner wall oxidation effectively. Secondly, food-grade eco-friendly matte inner coating. Compared with cheap thin varnish, the upgraded inner paint has stronger adhesion, resisting peeling and abrasion caused by frequent friction with stored items. It is odorless and heavy-metal-free, complying with safety standards for both stationery and direct food contact packaging. Thirdly, full-area mirror polishing treatment. Ordinary rectangular tin boxes have polishing dead angles on long narrow inner corners with hidden sharp burrs. Our full polishing process covers side walls, box bottom and inner opening edges, making the inner wall ultra-smooth to avoid hand scratches and surface damage to stored products. Fourthly, moisture-proof and rust-proof glazing treatment. The sealed glaze layer isolates air and moisture greatly, enhancing anti-rust performance, which is especially suitable for high-salinity and high-humidity marine transportation environment for full-container cross-border orders.

　　Matching the long and narrow structural feature of rectangular tin boxes, we customize an exclusive 108° opening angle to coordinate smooth inner wall usage experience and outer hinge mechanics. The universal 90° narrow opening blocks the rear inner storage area completely due to the long box depth, making the premium inner wall useless. While opening angles over 112° cause severe center-of-gravity deviation, making contents slide forward along the smooth inner wall and damage neat storage layout. Excessively stretched hinges will also cause stress cracks on inner wall joints and damage complete inner coating.

　　The optimized 108° golden opening angle perfectly fits the long-depth structure of rectangular tin boxes. It provides full unobstructed viewing vision to show the complete smooth inner wall, allowing easy access to items placed deep inside. The reasonable tilting angle prevents contents from sliding down along the smooth inner wall effectively. Besides, this angle disperses hinge opening stress and reduces vibration impact on inner coating, protecting inner paint from peeling during long-term repeated opening and closing. Full customization services are available, including outer color printing, logo embossing, inner wall color customization, size modification and opening angle fine adjustment with flexible MOQ and stable quality control. With premium durable inner wall technology and structure-matched ergonomic opening angle, this oem rectangular tin box solves all packaging pain points for brand clients, becoming a reliable high-quality supply for customized rectangular tin box OEM orders.