M2 M2.5 M3 M3.5 M4 M5 M6 M8 304 A2 Stainless Steel GB819 Cross Countersunk Head Screw, 3-100mm Lengthened Flat Bolt Fastener (80mm,M4 10pcs)

- Type: Standard GB819 cross recess flat countersunk head screw with classic cross structure. Optimized groove design increases screwdriver contact area, effectively prevents slipping and cam-out during tightening. Flush countersunk head realizes fully hidden installation for flat, seamless and tidy surface finish. - Material: Constructed with authentic 304 A2 stainless steel, featuring premium rust-proof, anti-corrosion and anti-oxidation performance. High hardness and tensile strength, not easy to bend, crack or deform. Stably adapts to humid, outdoor and corrosive environments for long-term service. - Specification: Covers complete common thread sizes M2, M2.5, M3, M3.5, M4, M5, M6, M8, matched with extended lengthened lengths of 3mm to 100mm. Solves the installation limitations of ordinary short screws for thick plates and long-distance fixing scenarios. - Installation: Universal cross screwdriver compatibility supports fast manual and electric installation & disassembly. Precision standardized full threads ensure tight meshing and firm locking. Effectively resist loosening caused by long-term equipment vibration and pressure. - Application: Versatile for industrial and household use, perfect for furniture assembly, electronic equipment, mechanical parts, home appliances, instrumentation and DIY crafts. Ideal for all scenarios requiring hidden flush fixing and aesthetic flat mounting surfaces.