NEWS

Prevent catastrophic joint failure. Compare carbon steel vs stainless steel hex bolts to balance mechanical strength and corrosion resistance.

Avoid fastener failure and cam-out. Compare self-drilling screw head types (Hex, Pan, Countersunk) to maximize torque and structural integrity.

Stop snapping bits and stripping heads. Learn to select the exact self drilling screw bit to eliminate cam-out and speed up metal fabrication.

Prevent costly joint failures. Learn the key differences between self-drilling and self-tapping screws to choose the right fastener every time.

The number on a bolt head is its strength class: 8.8 = 800 MPa tensile strength / 640 MPa yield (standard structural steel), 10.9 = 1000 MPa / 900 MPa (high-strength, automotive & heavy machinery), 12.9 = 1200 MPa / 1080 MPa (highest strength, critical precision applications, but brittle and hydrogen-sensitive). For most general use, 8.8 is correct; use 10.9 where loads are high; 12.9 only where its brittleness is acceptable.