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ขนาดรูเจาะนำสำหรับสกรูเกลียวปล่อย
Recommended Pilot Hole
 
For wood
Screw Diameter :
 
#2
#4
#6
#8
#10
#12
Soft Woods :
1/32"
3/64"
1/16"
5/64"
3/32"
7/64"
Hard Woods :
3/64"
1/16"
5/64"
3/32"
7/64"
1/8"

 

For Metal

IN SHEET METAL
STEEL ,STAINLESS BRASS , ALUMINUM
SCREW
METAL THICKNESS
PIERCED OR EXTRUDED HOLE
DRILLED OR CLEAN-PUNCHED HOLE
#4
 
0.5
0.6
0.8
0.9
-
2.5
2.5
2.5
2.2
2.4
2.4
2.5
#6
0.5
0.6
0.8
0.9
-
2.8
2.8
2.8
2.64
2.64
2.64
2.64
#7
0.5
0.6
0.8
0.9
1.22
-
3.05
3.05
3.05
3.05
2.9
2.9
2.9
2.9
3.05
#8
0.5
0.6
0.8
0.9
1.22
-
3.45
3.45
3.45
3.45
3.2
3.2
3.2
3.2
3.3
#10
0.6
0.8
0.9
1.22
4.0
4.0
4.0
4.0
3.4
3.4
3.4
3.4
#12
0.6
0.8
0.9
1.22
4.7
4.7
4.7
4.7
4.1
4.1
4.1
4.1

 

 

 

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