Screws for Plastic to JIS - hole sizes

 

The following tables contain reference hole sizes to install our range of JIS threadforming and thread tapping screws.

 
Nom dia. S-thread hole size - Length of thread engagement
0.8 1.0 1.2 1.6 2.0 2.6 3.2 4.0
2.0 1.76 1.78 1.80 1.83 1.85 - - -
2.3 2.05 2.07 2.08 2.10 2.13 - - -
2.5 2.23 2.24 2.26 2.28 2.31 2.33 - -
2.6 2.33 2.34 2.36 2.38 2.41 2.43 2.46 -
3.0 2.70 2.72 2.74 2.76 2.78 2.81 2.86 2.86
3.5 3.15 3.17 3.20 3.23 3.27 3.29 3.32 3.34
4.0 3.61 3.64 3.67 3.71 3.75 3.78 3.81 3.83
5.0 4.57 4.62 4.64 4.66 4.71 4.77 4.80 4.81
6.0 - 5.53 5.56 5.59 5.63 5.70 5.74 5.79
8.0 - - - 7.52 7.56 7.61 7.67 7.73
 
Nom dia. B-thread hole size for plastics - Length of thread engagement
1.5d 2.0d 2.5d 3.0d 3.5d 4.0d
2.0 1.65 1.68 1.71 1.73 1.75 1.77
2.3 1.91 1.95 1.97 1.99 2.03 2.06
2.6 2.15 2.19 2.21 2.24 2.26 2.29
3.0 2.49 2.51 2.54 2.59 2.65 2.68
3.5 2.94 2.97 3.03 3.10 3.14 3.17
4.0 3.39 3.43 3.47 3.54 3.58 3.62
5.0 4.33 4.38 4.43 4.53 4.58 4.63
6.0 5.27 5.33 5.44 5.51 5.57 5.57
8.0 6.99 7.13 7.28 7.36 7.43 7.44
 
P-thread hole sizes
Nom dia. Thickness of mating ABS & PP materials
Less than (2 x thread diameter) (2 x thread diameter) or more
2.0 1.70 1.75
2.3 2.00 2.05
2.5 2.10 2.15
2.6 2.20 2.25
3.0 2.50 2.60
3.5 3.02 3.10
4.0 3.44 3.55
5.0 4.37 4.45
6.0 5.26 5.35
8.0 7.16 7.25