==Standaard tabel==
|
Standard Wood Screw Sizes and Predrilling Recommendations
|
|
Screw Size (Gauge)
|
#2
|
#3
|
#4
|
#5
|
#6
|
#7
|
#8
|
#9
|
#10
|
#12
|
#14
|
#16
|
#18
|
|
Head Bore Size
|
Actual Head Size
|
11/64
|
13/64
|
15/64
|
1/4
|
9/32
|
5/16
|
11/32
|
23/64
|
25/64
|
7/16
|
1/2
|
35/64
|
39/64
|
|
Min. Counterbore Dia.
|
1/4
|
1/4
|
1/4
|
1/4
|
5/16
|
5/16
|
3/8
|
3/8
|
7/16
|
7/16
|
1/2
|
9/16
|
5/8
|
|
Recommended Size
|
1/4
|
5/16
|
5/16
|
3/8
|
3/8
|
3/8
|
3/8
|
3/8
|
1/2
|
1/2
|
1/2
|
5/8
|
5/8
|
|
Screw Shank - Hole Size
|
3/32
|
7/64
|
7/64
|
1/8
|
9/64
|
5/32
|
11/64
|
3/16
|
13/64
|
7/32
|
1/4
|
9/32
|
5/16
|
|
Straight Pilot Drill Size
|
Hardwood
|
1/16
|
5/64
|
5/64
|
3/32
|
7/64
|
7/64
|
1/8
|
9/64
|
9/64
|
5/32
|
11/64
|
3/16
|
7/32
|
|
Softwood
|
1/16
|
1/16
|
1/16
|
5/64
|
3/32
|
3/32
|
7/64
|
1/8
|
1/8
|
9/64
|
5/32
|
11/64
|
13/64
|
|
Tapered Pilot Drill Size
|
Hardwood
|
3/32
|
7/64
|
7/64
|
1/8
|
9/64
|
5/32
|
11/64
|
3/16
|
13/64
|
7/32
|
1/4
|
9/32
|
5/16
|
|
Softwood
|
5/64
|
3/32
|
3/32
|
7/64
|
1/8
|
9/64
|
5/32
|
11/64
|
3/16
|
13/64
|
15/64
|
17/64
|
19/64
|
|
Recommended Countersink Number
|
C3
|
C4
|
C4
|
C5
|
C6
|
C7
|
C8
|
C9
|
C102
|
C12
|
C14
|
C169
|
C18
|
|
|
|
Drill Length Recommendations for Countersink/Taper Point Drill Combos
|
|
Screw Size (Gauge)
|
#2
|
#3
|
#4
|
#5
|
#6
|
#7
|
#8
|
#9
|
#10
|
#12
|
#14
|
#16
|
#18
|
|
Tapered Drill Size
|
3/32
|
7/64
|
7/64
|
1/8
|
9/64
|
5/32
|
11/64
|
3/16
|
13/64
|
7/32
|
1/4
|
9/32
|
5/16
|
|
Short Length Drill
|
Min. Screw Length
|
1/4
|
5/16
|
5/16
|
3/8
|
7/16
|
1/2
|
5/8
|
11/16
|
3/4
|
7/8
|
3/4
|
13/16
|
7/8
|
|
Max. Screw Length *
|
5/8
|
11/16
|
11/16
|
5/8
|
11/16
|
13/16
|
7/8
|
15/16
|
1
|
1-1/8
|
1-1/4
|
1-7/16
|
1-9/16
|
|
Regular Length Drill
|
Min. Screw Length
|
3/8
|
7/16
|
7/16
|
1/2
|
9/16
|
5/8
|
3/4
|
13/16
|
15/16
|
1
|
1-1/8
|
1-1/4
|
1-3/8
|
|
Max. Screw Length **
|
1
|
1-1/2
|
1-3/8
|
1-3/8
|
1-1/2
|
1-3/4
|
1-7/8
|
2-1/8
|
2-1/4
|
2-3/8
|
2-5/8
|
2-5/16
|
2-11/16
|
|
Long Length Drill
|
Min. Screw Length
|
9/16
|
9/16
|
9/16
|
5/8
|
11/16
|
3/4
|
7/8
|
15/16
|
1-1/16
|
1-1/8
|
1-5/16
|
1-7/16
|
1-9/16
|
|
Max. Screw Length***
|
1-3/4
|
2
|
1-7/8
|
2-1/8
|
2-3/8
|
2-3/8
|
2-3/4
|
2-3/4
|
3
|
3
|
3-1/8
|
3-1/16
|
3-3/16
|
|
8” Long Drills
|
Min. Screw Length
|
N/A
|
N/A
|
N/A
|
3/4
|
13/16
|
1
|
1-1/16
|
1-3/16
|
1-1/4
|
1-1/4
|
1-1/2
|
1-5/8
|
1-3/4
|
|
Max. Screw Length***
|
N/A
|
N/A
|
N/A
|
4-3/4
|
4-3/4
|
4-3/4
|
4-3/4
|
4-3/4
|
4-3/4
|
4-3/4
|
4-3/4
|
4-11/16
|
4-11/16
|
|
* = 1/2” to 3/4” of shank for chucking ** = 3/4” to 1” of shank for chucking *** = Set screws positioned at end of twist
|
Anatomy van een houtschroef
Deze grafiek geeft de werkelijke afmetingen van hout schroeven en de dichtstbijzijnde fractionele formaat equivalenten.
De wortel diameters worden gemeten in het midden van het schroefdraadgedeelte van de schroef.
De wortel diameter op sommige houtschroeven taps langs de lengte van de draden.
Als het boren van een rechte piloot gat, raden we dezelfde boor grootte als de wortel diameter in hardhout en 15% kleiner in zachthout.
Head diameters vermeld zijn standaard voor platte kop en Oval-head schroeven.
Round Head schroeven kunnen 5% tot 10% kleiner zijn.
Wanneer de houtschroef grootte en de lengte die het beste past bij uw wensen te selecteren, in gedachten houden dat het
schroefdraadgedeelte van een houten schroef beslaat ongeveer 2/3 van de totale lengte van de schroef het verlaten
van 1/3 voor de schacht en het hoofd.
|
No. Of Screw
|
Maximum Head Diameter
|
Shank Diameter
|
Root Diameter
|
Threads Per Inch
|
No. Of Screw
|
|
Basic Dec. Size
|
Nearest Fractional Equivalent
|
Average Dec. Size
|
Nearest Fractional Equivalent
|
|
0
|
.119
|
.060
|
1/16
|
Oversize .002
|
.040
|
3/64
|
Oversize .007
|
32
|
0
|
|
1
|
.146
|
.073
|
5/64
|
Oversize .005
|
.046
|
3/64
|
Basic Size
|
28
|
1
|
|
2
|
.172
|
.086
|
3/32
|
Oversize .007
|
.054
|
1/16
|
Oversize .008
|
26
|
2
|
|
3
|
.199
|
.099
|
7/64
|
Undersize .010
|
.065
|
1/16
|
Undersize .002
|
24
|
3
|
|
4
|
.225
|
.112
|
7/64
|
Undersize .003
|
.075
|
5/64
|
Oversize.003
|
22
|
4
|
|
5
|
.252
|
.125
|
1/8
|
Basic Size
|
.085
|
5/64
|
Undersize .007
|
20
|
5
|
|
6
|
.279
|
.138
|
9/64
|
Oversize .002
|
.094
|
3/32
|
Basic Size
|
18
|
6
|
|
7
|
.305
|
.151
|
5/32
|
Oversize .005
|
.102
|
7/64
|
Oversize .007
|
16
|
7
|
|
8
|
.332
|
.164
|
5/32
|
Undersize .007
|
.112
|
7/64
|
Undersize .003
|
15
|
8
|
|
9
|
.358
|
.177
|
11/64
|
Undersize .005
|
.122
|
1/8
|
Oversize .003
|
14
|
9
|
|
10
|
.385
|
.190
|
3/16
|
Undersize .002
|
.130
|
1/8
|
Undersize .005
|
13
|
10
|
|
11
|
.411
|
.203
|
13/64
|
Basic Size
|
.139
|
9/64
|
Oversize .001
|
12
|
11
|
|
12
|
.438
|
.216
|
7/32
|
Oversize .003
|
.148
|
9/64
|
Undersize .007
|
11
|
12
|
|
14
|
.491
|
.242
|
1/4
|
Oversize .008
|
.165
|
5/32
|
Undersize .009
|
10
|
14
|
|
16
|
.544
|
.268
|
17/64
|
Undersize .002
|
.184
|
3/16
|
Oversize .003
|
9
|
16
|
|
18
|
.597
|
.294
|
19/64
|
Oversize .003
|
.204
|
13/64
|
Undersize .001
|
8
|
18
|
|
20
|
.650
|
.320
|
5/16
|
Undersize .007
|
.223
|
7/32
|
Undersize .004
|
8
|
20
|
|
24
|
.756
|
.372
|
3/8
|
Oversize .003
|
.260
|
1/4
|
Undersize .010
|
7
|
24
|
|
