M4/M5/M6/M8 304 stainless steel outer hexagonal flat pad elastic pad three combination screws flat brain combination bolt for Assembled Bolts for Furniture & Machinery

These M4/M5/M6/M8 304 stainless steel three-combination screws (hex head with flat washer and spring washer) are pre-assembled for convenient, efficient fastening in industrial, commercial, and DIY applications. Crafted from premium 304 stainless steel, they deliver exceptional corrosion resistance, rust proofing, and high tensile strength, making them suitable for indoor, outdoor, and humid environments—ideal for long-term use in harsh conditions.

 

The three-in-one integrated design combines an outer hexagonal (hex head) bolt, flat washer, and elastic (spring) washer, eliminating the need for separate assembly and saving valuable installation time. The outer hexagonal head allows for easy torque application with standard hex wrenches, ensuring tight, secure connections that resist loosening, even in vibration-prone settings. The flat washer distributes pressure evenly to protect fastened surfaces from scratches and damage, while the spring washer provides enhanced anti-loosening performance, keeping the screw securely in place.

 

Available in M4, M5, M6, and M8 sizes, these flat brain (flat head) combination bolts are versatile and widely applicable to furniture assembly, machinery maintenance, equipment installation, construction projects, automotive repairs, and home improvement. They are compatible with wood, metal, plastic, and concrete, making them a reliable choice for both professional tradespeople and DIY enthusiasts. Whether for workshop use, factory production, home renovations, or industrial machinery, these pre-assembled 304 stainless steel combination screws offer convenience, durability, and consistent performance.