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Official Journal of the Japan Wood Research Society

Table 2 Specifications of screws [37]

From: Prediction of withdrawal resistance for a screw in hybrid cross-laminated timber

Self-tapping screw

Ø6.5 × 65 mm

Ø8.0 × 100 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