Press-Fit Inserts

 Press-fit inserts are commonly used in plastic products that have been traditionally manufactured or 3D printed. Xometry uses brass inserts and recommends designing to the insert length and holed diameter described below.

Press-Fit Inserts for Plastic

Thread Maximum Insert Length(in) Hole Diameter(in)
UNC/UNF    
0-80 UNC 0.125 0.094
2-56 UNC 0.156 0.125
4-40 UNC 0.188 0.156
6-32 UNC 0.250 0.188
8-32 UNC 0.313 0.219
10-24 UNC 0.375 0.250
10-32 UNF 0.375 0.250
1/4-20 UNC 0.500 0.313
5/16-18 UNC 0.563 0.375
3/8-16 UNC 0.625 0.438
Metric    
M3x0.5 0.189 0.157
M3.5×0.6 0.252 0.189
M4x0.7 0.315 0.220
M5x0.8 0.374 0.252
M6x1.0 0.500 0.315
 

Helical Inserts

Thread Maximum Insert Length(in) Hole Diameter(in)
UNC/UNF    
2-56 UNC 0.215 0.091
4-40 UNC 0.336 0.118
4-48 UNF 0.168 0.118
5-40 UNC 0.250 0.134
6-32 UNC 0.414 0.146
8-32 UNC 0.492 0.172
8-36 UNF 0.328 0.172
10-24 UNC 0.475 0.201
10-32 UNF 0.570 0.201
1/4-20 UNC 0.750 0.264
Metric    
M2x0.4 0.086 0.083
M2.5×0.45 0.248 0.104
M3x0.5 0.295 0.126
M4x0.7 0.394 0.167
M5x0.8 0.492 0.209
M6x1.0 0.590 0.248
M8x1.25 0.787 0.331
M10x1.5 0.591 0.413
M12x1.75 0472 0.492

Dowel Pins

Pin Size Decimal Size (in) Max Pin Length (in)
Inch    
1/32″ 0.03125 .625
1/16″ 0.0625 1.000
3/32″ 0.09375 1.000
1/8″ 0.125 1.000
5/32″ 0.15625 0.500
3/16″ 0.1875 1.000
1/4″ 0.250 1.000
Metric    
1mm 0.0394 0.394
1.5mm 0.059 0.630
2mm 0.0787 0.787
2.5mm 0.0984 0.472
3mm 0.118 1.181
4mm 0.157 1.575
5mm 0.197 0.787
6mm 0.236 0.551
8mm 0.315 0.787
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