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 (35mm,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.

Our GB819 Lengthened Cross Flat Countersunk Head Screws are made of high-grade 304 A2 stainless steel, delivering outstanding rust resistance, corrosion resistance and durable mechanical performance, far superior to ordinary carbon steel screws. Adopting standard cross recess design, these screws match all universal cross screwdrivers perfectly, avoiding slipping and head damage during assembly to improve working efficiency. Precision machined with full, uniform and burr-free threads, each screw features tight fitting and stable locking without loosening. The flush countersunk head enables hidden installation, leaving smooth and flat mounting surfaces without protruding parts, ensuring both practicality and neat appearance. Featuring complete M2-M8 thread specifications and extended 3-100mm length options, these lengthened screws perfectly meet the fixing demands of thick workpieces and long-distance assembly that standard short screws cannot solve. With fine surface polishing treatment, the screws resist oxidation and keep stable performance in humid indoor and outdoor environments. Easy to install and disassemble without professional tools or skills. Widely applicable for furniture assembly, electronic device fixing, mechanical maintenance, household appliance installation and various DIY projects, being essential general fasteners for home and industrial use.