Head diameter of 8.5mm with a precise 0.8mm thread pitch, these Grade 5 (6AL/4V) Titanium bolts feature a 5mm tapered head requiring a 4mm Allen key. At half the weight of steel equivalents, these high-strength, corrosion-resistant fasteners deliver superior performance without rust concerns. Their exceptional strength-to-weight ratio makes them ideal for demanding applications across sports equipment, automotive racing, aerospace engineering, and medical technology.