Engineered Components - Anchor Bolt and Screw Company
Engineered Components - Anchor Bolt and Screw Company
Engineered Components - Anchor Bolt and Screw Company
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<strong>Engineered</strong><br />
<strong>Components</strong> COMPANY<br />
847-841-7000 • Fax 847-841-7007<br />
Counter<br />
Sink (C)<br />
Shank<br />
Hole (B)<br />
Pilot<br />
Hole (A)<br />
Pilot Holes<br />
Pilot holes for wood screws are<br />
recommended, especially for hard<br />
woods. They greatly lessen the<br />
possibility of damage to screws <strong>and</strong> to<br />
the wood. The hole in the first piece of<br />
wood should be bored large enough to<br />
accommodate freely the screw shank.<br />
HOLE SIZES*<br />
FOR WOOD SCREWS<br />
In the the second piece of wood the<br />
hole should be slightly smaller than the<br />
screw shank, as shown in the chart<br />
below. The hole depth should be about<br />
one-half the length of the screw in the<br />
second piece of wood. the length of the<br />
screw chosen for the job will properly<br />
be at least an 1/8” shorter than the<br />
combined thickness of the wood.<br />
<strong>Screw</strong><br />
Size<br />
Hard Woods<br />
Pilot Hole (A)<br />
Soft Woods<br />
Shank Clearance<br />
Hole (B)<br />
Counter<br />
Sink (C)<br />
Twisted Bit<br />
(Nearest size in<br />
fractions of an<br />
inch)<br />
Drill Gauge No.<br />
To be used for<br />
for maximum<br />
holding power<br />
Twist Bit<br />
(Nearest size in<br />
fractions of an<br />
inch)<br />
Drill Gauge No.<br />
To be used for<br />
for maximum<br />
holding power<br />
Twist Bit<br />
(Nearest size in<br />
fractions of an<br />
inch)<br />
Drill Gauge No.<br />
To be used for<br />
for maximum<br />
holding power<br />
Number of<br />
Auger Bits<br />
To counterbore<br />
for sinking<br />
head (by 16ths)<br />
2 – 54 1/32 65 3/32 42 3<br />
3 1/16 53 3/64 58 7/64 37 4<br />
4 1/16 51 3/64 55 7/64 32 4<br />
5 5/64 47 1/16 53 1/8 30 4<br />
6 – 44 1/16 52 9/64 27 5<br />
7 – 39 1/16 51 5/32 22 5<br />
8 7/64 35 5/64 48 11/64 18 6<br />
9 7/64 33 5/64 45 3/16 14 6<br />
10 1/8 31 3/32 43 3/16 10 6<br />
11 – 29 3/32 40 13/64 4 7<br />
12 – 25 7/64 38 7/32 2 7<br />
14 3/16 14 7/64 32 1/4 D 8<br />
16 – 10 9/64 29 17/64 I 9<br />
18 13/64 6 9/64 26 19/64 N 10<br />
20 7/32 3 11/64 19 21/64 P 11<br />
24 1/4 D 3/16 15 3/8 V 12<br />
* Sizes for holes recommended for average application. Slightly larger holes may be required.<br />
121
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