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THREAD FORMING SCREWS

Thread Forming ScrewsThread Forming Screw
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Unit: U.S. Inches      Metric
Size:
Length:

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Sizes Usually Available            
#2 THREAD FORMING SCREWS     
#3 THREAD FORMING SCREWS     
#4 THREAD FORMING SCREWS     
#5 THREAD FORMING SCREWS     
#6 THREAD FORMING SCREWS     
#8 THREAD FORMING SCREWS     
#10 THREAD FORMING SCREWS     
#12 THREAD FORMING SCREWS     
2-56 THREAD FORMING SCREWS     
3-48 THREAD FORMING SCREWS     
4-40 THREAD FORMING SCREWS     
5-40 THREAD FORMING SCREWS     
6-32 THREAD FORMING SCREWS     
8-32 THREAD FORMING SCREWS     
10-32 THREAD FORMING SCREWS     
10-24 THREAD FORMING SCREWS     
12-24 THREAD FORMING SCREWS     
1/4 -20 THREAD FORMING SCREWS     
5/16-18 THREAD FORMING SCREWS     
3/8 -16 THREAD FORMING SCREWS     
1/2 -13 THREAD FORMING SCREWS     

Metric Sizes Usually Available            
M3      
M4      
Lengths Usually Available            
3/16 in.     
1/4 in.     
5/16 in.     
3/8 in.     
7/16 in.     
1/2 in.     
9/16 in.     
5/8 in.     
3/4 in.     
7/8 in.     
1 in.     
1 1/8 in.     
1 1/4 in.     
1 1/2 in.     
1 3/4 in.     
2 in.     
2 1/2 in.     
3 in.     
- in.     

Metric Lengths Usually Available            
6MM      
8MM      
10MM      
12MM      

Suggested Hole Sizes for Thread Forming Screws

Nominal
Screw Size
Hole Diameter
Closest Drill Size to
Mean Hole Diameter
Max
Mean
Min
Drill size
Drill Dia
2 - 56
0.078
0.076
0.074
48
0.076
2 - 64
0.077
3 - 48
0.090
0.087
0.084
44
0.086
3 - 56
0.089
4 - 40
0.100
0.097
0.094
41
0.096
4 - 48
0.100
5 - 40
0.113
0.110
0.107
35
0.110
5 - 44
0.112
6 - 32
0.123
0.119
0.115
31
0.120
6 - 40
0.124
8 - 32
0.150
0.146
0.141
20
0.147
8 - 36
0.148
10 - 24
0.170
0.165
0.160
19
0.166
10 - 32
0.177
0.172
0.167
11-64
0.1719
12 - 24
0.198
0.192
0.186
11
0.191
12 - 28
0.196
1/4 - 20
0.228
0.221
0.214
2
0.221
1/4 - 28
0.230
5/16 - 18
0.289
0.218
0.273
K
0.281
5/16 - 24
0.290
3/8 - 16
0.349
0.339
0.329
R
0.339
3/8 - 24
0.353
7/16 - 14
0.409
0.397
0.385
X
0.397
7/16 - 20
0.411
1/2 - 13
0.471
0.457
0.443
29/64
0.4531
1/2 - 20
0.475

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