Wood Screw Shank Diameter Pilot Hole

Reference data and engineering information about wood screw shank diameter pilot hole for material properties applications.

woodscrewshankdiameter

Overview

Engineering reference data for Wood Screw Shank Diameter Pilot Hole in material science and properties.

Key Formulas

Stress

$\sigma = \frac{F}{A}$

Force per unit area.

Strain

$\varepsilon = \frac{\Delta L}{L_0}$

Change in length per original length.

Hooke's Law

$\sigma = E \varepsilon$

Stress proportional to strain in elastic region.

Thermal Expansion

$\Delta L = \alpha L_0 \Delta T$

Length change due to temperature.

Variables

Symbol	Description	Unit
$\sigma$	Stress	Pa
$\varepsilon$	Strain	—
$E$	Young's modulus	Pa
$\alpha$	Thermal expansion coefficient	1/°C
$\Delta T$	Temperature change	°C

Wood Screw Shank Diameter Reference Table

17 rows

US Wood Screw Nominal Sizes and Shank Diameters
Nominal Size	Shank Diameter (Decimal)(in)	Shank Diameter (Fractional)(in)
0	0.06	1/16
1	0.073	5/64
2	0.086	3/32
3	0.099	7/64
4	0.112	7/64
5	0.125	1/8
6	0.138	9/64
7	0.151	5/32
8	0.164	5/32
9	0.177	11/64
10	0.19	3/16
11	0.203	13/64
12	0.216	7/32
14	0.242	1/4
16	0.268	17/64
18	0.294	19/64
20	0.32	5/16

Source: engineeringtoolbox.com

Purpose of Pilot Holes

Drilling a proper pilot hole is crucial for several reasons:

Prevents Splitting: It removes material in advance, reducing the pressure exerted by the screw threads that can cause wood fibers to split apart.
Ensures Tight Joints: It allows the screw to be driven in with less force, enabling the screw head and the workpiece to meet cleanly for a secure, flush fit.
Improves Holding Power: For hard woods, it guides the screw along the intended path without wandering.

Unit Conversion: $1 \text{ in} = 25.4 \text{ mm}$

Interactive Charts

Wood screws - shank diameters and pitot holes

References

Original Source

Source: engineeringtoolbox.com