WOOD SCREW SIZES

Wood screw sizes and thread dimensions are shown in the following charts according to ANSI B18.6.1-1981 standard.

ANSI B18.6.1 wood screw standard covers the sizes and dimensions for the various types of slotted and recessed (Phillips, Frearson, Pozidriv) head wood screws.

The wood screw head types are flat head, oval head, pan head .

The designation of wood screws shall be in following format: Nominal size; product name, including head style and driving provision; material; and finish. Ex: 6 x 5/8 Slotted Flat Countersunk Head Wood Screw, Steel

Some important notes from the ASME B18.6.1-1981:

- The threads of wood screws are coarse pitch threads and may be either cut or rolled.

- Wood screws shall have a gimlet point.

- For cut thread screws, the length of the thread shall be approximately 2/3 of the nominal length of the screw.

- For rolled thread screws, the length of the thread shall be at least 4 x basic screw diameter or 2/3 of the nominal screw length, whichever is larger. Screws with too short nominal lengths shall have threads extending as close to the underside of the head as possible.

- Material: Wood.screws shall be made from steel, stainless steel, brass, aluminum alloy, or other materials as designated by the purchaser.

- Standard lengths of wood screws are given below.

Nominal Screw Length Nominal Length Increment Tolerance on Length
Plus Minus
Up to 5/8 in., incl 1/8 0 0.03
Over 5/8 to 1 in., incl 1/8 0 0.05
Over 1 to 1 1/2 in., incl 1/4 0 0.05
Over 1 1/2 to 2 3/4 in., incl 1/4 0 0.06
Over 2 3/4 in 1/2 0 0.09



Calculator:

INPUT PARAMETERS
Screw Size Number


 


Dimensions of Threads and Body Diameters for Wood Screws
Dimensions of Threads and Body Diameters for Wood Screws
Nominal
Size
Threads
per Inch
Thread Major Diameter Body Diameter
(Cut Thread)
Body Diameter
(Rolled Thread)
Thread
Depth
Number Decimal Dmax Dmin Emax Emin E1max E1min Fmin
--- --- --- --- --- --- --- --- --- ---

Notes:

- Cut thread type screws are usually supplied with single lead threads for all screw lengths.

- Rolled thread type screws may be supplied with either single lead or double lead threads. Single lead threads are preferred where the nominal length of the screw is shorter than 4 times the basic screw diameter.





Supplements:



Link Usage
Flat Head Wood Screw Sizes Flat head wood screw sizes and thread dimensions according to ANSI B18.6.1-1981 standard.
Oval Head Wood Screw Sizes Oval head wood screw sizes and thread dimensions according to ANSI B18.6.1-1981 standard.
Pan Head Wood Screw Sizes Pan head wood screw sizes and thread dimensions according to ANSI B18.6.1-1981 standard.

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