TAPTITE 2000 Thread-Rolling Fasteners for Metal

TAPTITE 2000 ® STANDARD FASTENERS
HOLE SIZES PER PERCENTAGE OF THREAD ENGAGEMENT – METRIC SIZES (mm)
Nominal
Percent Thread Engagement
Screw Size 100 95 90(1) 85(1) 80 75 70 65 60 55 50 45 40 35
M2.5 x 0.45 2.21 2.22 2.24 2.25 2.27 2.28 2.29 2.31 2.32 2.34 2.35 2.37 2.38 2.40
M3 x 0.5 2.67 2.69 2.71 2.72 2.74 2.76 2.77 2.79 2.80 2.82 2.84 2.85 2.87 2.90
M3.5 x 0.6 3.11 3.13 3.15 3.17 3.19 3.21 3.23 3.25 3.27 3.29 3.30 3.32 3.34 3.36
M4 x 0.7 3.54 3.57 3.59 3.61 3.64 3.66 3.68 3.70 3.73 3.75 3.77 3.79 3.80 3.84
M4.5 x 0.75 4.01 4.04 4.06 4.09 4.11 4.13 4.16 4.18 4.21 4.23 4.26 4.28 4.30 4.33
M5 x 0.8 4.48 4.51 4.53 4.56 4.58 4.61 4.64 4.66 4.69 4.71 4.74 4.77 4.79 4.82
M6 x 1.0 5.35 5.38 5.42 5.45 5.48 5.51 5.54 5.58 5.61 5.64 5.67 5.71 5.74 5.77
M7 x 1.0 6.35 6.38 6.42 6.45 6.48 6.51 6.54 6.58 6.61 6.64 6.67 6.71 6.74 6.77
M8 x 1.25 7.19 7.23 7.27 7.31 7.35 7.39 7.43 7.47 7.51 7.55 7.59 7.63 7.67 7.72
M10 x 1.5 9.03 9.07 9.12 9.17 9.22 9.27 9.32 9.37 9.41 9.46 9.51 9.56 9.61 9.66
M12 x 1.75 10.86 10.92 10.98 11.30 11.09 11.15 11.20 11.26 11.31 11.37 11.43 11.49 11.55 11.60
HOLE SIZES PER PERCENTAGE OF THREAD ENGAGEMENT – INCH SIZES (in)
Nominal Percent Thread Engagement
Screw
Size
100 95 90(1) 85(1) 80 75 70 65 60 55 50 45 40 35
2-56
0.074 0.075 0.075 0.076 0.076 0.077 0.077 0.078 0.079 0.079 0.080 0.080 0.081 0.081
4 0 6 1 7 3 9 5 0 6 2 8 4 9
3-48
0.085 0.086 0.086 0.087 0.088 0.088 0.089 0.090 0.090 0.091 0.092 0.092 0.093 0.094
5 1 8 5 2 8 5 2 9 6 2 9 6 3
4-40
0.095 0.096 0.097 0.098 0.099 0.099 0.100 0.101 0.102 0.103 0.103 0.104 0.105 0.106
8 6 4 2 0 8 6 4 3 1 9 7 5 3
5-40
0.108 0.109 0.110 0.111 0.112 0.112 0.113 0.114 0.115 0.116 0.116 0.117 0.118 0.119
8 6 4 2 0 8 6 4 3 1 9 7 5 3
6-32
0.117 0.118 0.119 0.120 0.121 0.122 0.123 0.124 0.125 0.126 0.127 0.128 0.129 0.130
7 7 7 7 8 8 8 8 8 8 8 9 9 9
8-32
0.143 0.144 0.145 0.146 0.147 0.148 0.149 0.150 0.151 0.152 0.153 0.154 0.155 0.156
7 7 7 7 8 8 8 8 8 8 8 9 9 9
10-24
0.162 0.164 0.165 0.167 0.168 0.169 0.171 0.172 0.173 0.175 0.176 0.177 0.179 0.180
9 3 6 0 3 7 0 4 8 1 5 8 2 5
10-32
0.169 0.170 0.171 0.172 0.173 0.174 0.175 0.176 0.177 0.178 0.179 0.180 0.181 0.182
7 7 7 7 8 8 8 8 8 8 8 9 9 9
12-24
0.188 0.190 0.191 0.193 0.194 0.195 0.197 0.198 0.199 0.201 0.202 0.203 0.205 0.206
9 3 6 0 3 7 0 4 8 1 5 8 2 5
1/4-20
0.217 0.219 0.220 0.222 0.224 0.225 0.227 0.228 0.230 0.232 0.233 0.235 0.237 0.238
5 1 8 4 0 6 3 9 5 1 8 4 0 6
5/16-18
0.276 0.278 0.280 0.281 0.283 0.285 0.287 0.289 0.290 0.292 0.294 0.296 0.298 0.299
4 2 0 8 6 4 2 0 8 6 4 3 1 9
3/8-16
0.334 0.336 0.338 0.340 0.342 0.344 0.346 0.348 0.350 0.352 0.354 0.356 0.358 0.360
NOTE: Nominal screw diameters are used when calculating hole sizes and are based on the U.S. basic
thread depth of .6495 times the pitch. Hole data accuracy decreases for engagements less than 70%. This is
because the above data is based on a linear relation between hole size and percentage of thread
engagement.
Hole Size = D – (0.6495 x P x %). In this equation, D is equal to the nominal screw diameter.
(1)
Pilot holes listed under the 90% and 85% thread engagement columns are recommended for single punch
extruded holes.
Typical tolerance for the pilot hole range is -10% to +5% from the nominal percent thread engagement. Example: for
a M12 TAPTITE 2000 ® fastener using a single punch extruded hole, the nominal hole size is 85% thread
engagement or 11.30mm, bounded by a tolerance window of 11.15mm (75% thread engagement) to 10.98mm
(90% thread engagement.
PROPER DESIGN
Due to the variability of materials such as cast iron and powdered metals, please contact an Acument Global
Technologies applications engineer for proper hole size recommendations to ensure proper fastener performance.