FLAT HEAD WOOD SCREW SIZES

Flat head wood screw sizes and dimensions are shown in the following charts according to ANSI B18.6.1-1981 standard for slotted, Phillips, Frearson and Pozidriv drives.

The flat head (also referred to as "flat countersunk head") is a type of wood screw and shall have a flat top surface and a bearing surface with a conical head angle of approximately 82 deg.

The designation of flat head wood screws shall be in following format: Nominal size; product name, including head style and driving provision; material; and finish. Ex: 8 x 7/8 Slotted Flat Countersunk Head Wood Screw, Steel

- Standard lengths of wood screws are given below.

Flat head wood screw sizes and dimensions:

INPUT PARAMETERS
Screw Size Number	0 1 2 3 4 5 6 7 8 9 10 12 14 16 18 20 24

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Dimensions of Slotted Flat Countersunk Head Wood Screws
Parameter		Value
Nominal Size	Number	---
	Decimal	---
Head Diameter	Amax	---
	Amin	---
Head Height	Href	---
Slot Width	Jmax	---
	Jmin	---
Slot Depth	Tmax	---
	Tmin	---
Fillet Radius	Rmax	---
Dimensions of Phillips (Type I Cross) Recessed Flat Countersunk Head Wood Screws
Nominal Size	Number	---
	Decimal	---
Head Diameter	Amax	---
	Amin	---
Head Height	Href	---
Recess Diameter	Mmax	---
	Mmin	---
Recess Depth	Tmax	---
	Tmin	---
Recess Width	Nmin	---
Driver Size	---	---
Recess Penetration Gaging Depth	Max	---
	Min	---
Fillet Radius	Rmax	---
Dimensions of Pozidriv (Type IA Cross) Recessed Flat Countersunk Head Wood Screws
Nominal Size	Number	---
	Decimal	---
Head Diameter	Amax	---
	Amin	---
Head Height	Href	---
Recess Diameter	Mmax	---
	Mmin	---
Recess Depth	Tmax	---
	Tmin	---
Recess Width	Nmin	---
Driver Size	---	---
Recess Penetration Gaging Depth	Max	---
	Min	---
Fillet Radius	Rmax	---
Dimensions of Frearson (Type II Cross Recessed) Flat Countersunk Head Wood Screws
Nominal Size	Number	---
	Decimal	---
Head Diameter	Amax	---
	Amin	---
Head Height	Href	---
Recess Diameter	Mmax	---
	Mmin	---
Recess Depth	Tmax	---
	Tmin	---
Recess Width	Nmin	---
Driver Size	---	---
Recess Penetration Gaging Depth	Max	---
	Min	---
Fillet Radius	Rmax	---

Supplements:

Reference:

• ANSI B18.6.1 - 1981, Wood Screws (INCH SERIES)