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Shown below are actual size hex heads for standard screw sizes.
Example: a 1/4" screw has a 7/16 head and thus requires a 7/16
wrench. To measure length, use the scale below.
STANDARD
FASTENER
IDENTIFICATION
CHART
Hardware sizes are given in the
illustrations throughout this
manual.
If a washer or nut is identified
as "washer, 1/2'- or "nut, 1/2",
this means the inside diameter
isT/2 inch.
If a screw is identified as "screw,
1/2 X 2", this means the shaft
diameter is 1/2 inch and the
shaft of the screw is 2 inches
long. If a screw is identified as
"screw, 1 /2-16 x 2", the number
"16" means that the screw has
16 threads per inch.
SAMPLE: SCREW IDENTIFICATION
^
V*"
."itiiT""'
3/4" Head
5/8" Head
9/16" Head screw with screw with
screw with
screw with
screw with
5/16" S.D.
1/4" S.D.
1/2" S.D.
7/16" S:D.
3/8" S.D.
S.D. = Shaft Diameter
WASHER AND NUT IDENTIFICATION
Place the washer or nut on the above scale to
determine the inside diameter. The actual inside
diameter can vary 1/16 inch. Use the scale for
comparison.
Screw 1/2x2
Shaft
Diameter
Shaft
/
Screw
Diameter-/
Length
SAMPLE: NUT IDENTIFICATION
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