M4 x 18mm Flat Head Screw | 304 Steel Hex Socket Countersunk Bolt | Metric M4 Hardware for 3D Printers CNC Robotics Flush Mount Fastening

Description ✅ M4 thread – 4mm diameter, 18mm length✅ Flat/countersunk head – sits flush with surface✅ Hex socket – 2.5mm Allen key drive✅ 304 stainless steel – corrosion-resistant and durable✅ Perfect for structural joints, stepper motor plates, and frame corners