Threading: Coil Inserts

Coil insert threading is available for UNC, UNF, and metric threads on both milled and turned parts. Coil inserts are only available for plastics and soft metals such as aluminum, brass, and copper.

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UNC threads Minimum modeled diameter (in.) Maximum modeled diameter (in.) 75% hole drill size (in.) Maximum thread depth (in.)*
#2-56 0.090 0.096 0.091 0.300
#3-48 0.105 0.110 0.107 0.400
#4-40 0.117 0.125 0.119 0.400
#5-40 0.131 0.137 0.132 0.400
#6-32 0.145 0.153 0.147 0.600
#8-32 0.171 0.178 0.173 0.600
#10-24 0.199 0.208 0.201 0.650
#12-24 0.225 0.234 0.227 0.650
1/4-20 0.261 0.270 0.266 0.650
5/16-18 0.324 0.334 0.332 1.000
3/8-16 0.389 0.399 0.397 1.200
7/16-14 0.453 0.464 0.453 1.200
1/2-13 0.515 0.531 0.531 1.200
*Obstruction by other features of your part, lead-in treatments, or fixturing requirements may reduce the maximum depth of threads.
UNF threads Minimum modeled diameter (in.) Maximum modeled diameter (in.) 75% hole drill size (in.) >Maximum thread depth (in.)*
#2-64 0.090 0.095 0.092 0.300
#3-56 0.103 0.104 0.104 0.300
#4-48 0.117 0.123 0.120 0.400
#6-40 0.144 0.150 0.148 0.600
#8-36 0.170 0.177 0.174 0.600
#10-32 0.197 0.204 0.200 0.650
1/4-28 0.258 0.265 0.261 0.650
5/16-24 0.322 0.329 0.325 1.000
3/8-24 0.384 0.391 0.387 1.000
7/16-20 0.448 0.456 0.452 1.200
1/2-20 0.511 0.519 0.515 1.200
*Obstruction by other features of your part, lead-in treatments, or fixturing requirements may reduce the maximum depth of threads.
Metric threads Minimum modeled diameter (mm) Maximum modeled diameter (mm) 75% hole drill size (mm) Maximum thread depth (mm)*
M2 x 0.4 2.09 2.14 2.14 5.08
M2.5 x 0.45 2.55 2.65 2.60 7.62
M3 x 0.5 3.11 3.25 3.18 10.16
M3.5 x 0.6 3.68 3.79 3.70 15.24
M4 x 0.7 4.15 4.33 4.24 15.24
M5 x 0.8 5.17 5.37 5.27 16.51
M6 x 1.0 6.22 6.41 6.31 16.51
M8 x 1.25 8.27 8.48 8.38 25.40
M10 x 1.5 10.33 10.56 10.56 30.48
M12 x 1.75 12.38 12.64 12.51 30.48
*Obstruction by other features of your part, lead-in treatments, or fixturing requirements may reduce the maximum depth of threads.