Table 2.
Material Property of Screw

Self-tapping screw Ø6.5×65 mm Ø6.5×65 mm
Tensile strength (MPa) ≥ 600 ≥ 600
Modulus of elasticity (MPa) 210,000 210,000
Outer thread diameter (mm) 6.50 8.00
Inner thread diameter (mm) 3.25 5.30
Inner/thread diameter ratios 0.50 0.66
Length (mm) 65.00 100.00
Tip length (mm) 5.6 11.5
Head diameter (mm) 10.00 13.00
Pitch (mm) 2.80 3.60