DIMENSIONAL SPECIFICATIONS: Thread Size: #4-40 (Coarse Thread); Head Dia: 0.23"; Screw Length: 1/2 inch (measured from the flat top of the head to the tip of the threads). Please verify your required length using this method before ordering to ensure a perfectly flush fit PREMIUM 304 STAINLESS STEEL (ASME COMPLIANT): Manufactured to strict ASME B18.6.3 standard specifications for machine screws. Forged entirely from 100% solid 304 (18-8) stainless steel, offering superior tensile strength and lifetime resistance against oxidation, rust, and chemical corrosion in damp environments UNIVERSAL #4-40 MICRO FIT (ALL SCENARIOS): The #4-40 thread is the absolute standard for precision electronics and micro-machinery. Choose short lengths for custom mechanical keyboard cases, D-sub connector plates, and FPV drone frames; standard lengths for 3D printer hotend mounts, RC car chassis, and micro-servos; or extended lengths for securing thicker electronic enclosures and stacked PCB standoffs TRUE FLUSH MOUNT & HIGH TORQUE DRIVE: Engineered with a standard 82-degree countersunk Flat Head that sits perfectly flush with the mounting surface, eliminating snag hazards and providing a sleek, aerodynamic profile. The deep Hex Socket (Allen) drive handles significantly higher torque than Phillips screws, completely eliminating cam-out and stripped heads during assembly INSTALLATION & ATTENTION TIPS: A precision 1/16" Hex Key (Allen Wrench) is highly recommended for all #4-40 lengths. Warning: Because the 1/16" hex drive is very small, use a high-quality Allen wrench and NEVER over-torque the screw, as micro-hex sockets are susceptible to rounding out. To achieve a flawless flush finish, ensure your pre-drilled holes are properly countersunk at an 82-degree angle PREMIUM FLAT HEAD SOCKET CAP SCREWS
Engineered for precision and high torque, these ASME B18.3 compliant fasteners feature a standard 82-degree countersink for a perfectly flush mount. The deep hex (Allen) drive handles extreme tension and prevents stripping.

100% Solid 304 Stainless Steel (18-8)
Delivers lifetime rust and corrosion resistance. Ideal for robotics, woodworking jigs, PC builds, and heavy machinery.

⚠️ CRITICAL MEASUREMENT NOTE:
Industry standards dictate that the specified length INCLUDES the head. Measure from the flat top surface down to the tip of the threads to ensure an exact fit for your project.