• Recess Dimensions for Flat Countersunk Trim Head Tapping Screws - TYPE I
  • Type Designations for Tapping Screws and Metallic Drive Screws
  • When specifying nominal size in decimals, zeros preceding decimal and in the fourth decimal place shall be omitted.
  • Head dimensions not shown are the same as those of slotted heads.
  • Not practical to gage sizes No. 0 and No. 1.
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Item #

Description

Type

Nominal Size or Basic Screw Dia.

Ref. (M)

Ref. (T)

Ref. (N)

Driver Size

N/A Type I Cross Recessed Undercut Flat Countersunk Head Tapping Screw, 0.0600" Nominal Dia. N/A Type I N/A No. 0 N/A 0.062 in N/A 0.035 in N/A 0.014 in N/A 0
N/A Type I Cross Recessed Undercut Flat Countersunk Head Tapping Screw, 0.0730" Nominal Dia. N/A Type I N/A No. 1 N/A 0.070 in N/A 0.043 in N/A 0.015 in N/A 0
N/A Type I Cross Recessed Undercut Flat Countersunk Head Tapping Screw, 0.0860" Nominal Dia. N/A Type I N/A No. 2 N/A 0.088 in N/A 0.048 in N/A 0.017 in N/A 1
N/A Type I Cross Recessed Undercut Flat Countersunk Head Tapping Screw, 0.0990" Nominal Dia. N/A Type I N/A No. 3 N/A 0.096 in N/A 0.055 in N/A 0.018 in N/A 1
N/A Type I Cross Recessed Undercut Flat Countersunk Head Tapping Screw, 0.1120" Nominal Dia. N/A Type I N/A No. 4 N/A 0.110 in N/A 0.070 in N/A 0.018 in N/A 1
N/A Type I Cross Recessed Undercut Flat Countersunk Head Tapping Screw, 0.1250" Nominal Dia. N/A Type I N/A No. 5 N/A 0.122 in N/A 0.081 in N/A 0.018 in N/A 1
N/A Type I Cross Recessed Undercut Flat Countersunk Head Tapping Screw, 0.1380" Nominal Dia. N/A Type I N/A No. 6 N/A 0.140 in N/A 0.066 in N/A 0.025 in N/A 2
N/A Type I Cross Recessed Undercut Flat Countersunk Head Tapping Screw, 0.1510" Nominal Dia. N/A Type I N/A No. 7 N/A 0.148 in N/A 0.074 in N/A 0.027 in N/A 2
N/A Type I Cross Recessed Undercut Flat Countersunk Head Tapping Screw, 0.1640" Nominal Dia. N/A Type I N/A No. 8 N/A 0.168 in N/A 0.094 in N/A 0.029 in N/A 2
N/A Type I Cross Recessed Undercut Flat Countersunk Head Tapping Screw, 0.1900" Nominal Dia. N/A Type I N/A No. 10 N/A 0.182 in N/A 0.110 in N/A 0.030 in N/A 2
N/A Type I Cross Recessed Undercut Flat Countersunk Head Tapping Screw, 0.2160" Nominal Dia. N/A Type I N/A No. 12 N/A 0.226 in N/A 0.110 in N/A 0.030 in N/A 3
N/A Type I Cross Recessed Undercut Flat Countersunk Head Tapping Screw, 0.2500" Nominal Dia. N/A Type I N/A 1/4 in N/A 0.244 in N/A 0.124 in N/A 0.032 in N/A 3
N/A Type I Cross Recessed Undercut Flat Countersunk Head Tapping Screw, 0.3125" Nominal Dia. N/A Type I N/A 5/16 in N/A 0.310 in N/A 0.157 in N/A 0.053 in N/A 4
N/A Type I Cross Recessed Undercut Flat Countersunk Head Tapping Screw, 0.3750" Nominal Dia. N/A Type I N/A 3/8 in N/A 0.358 in N/A 0.205 in N/A 0.061 in N/A 4
N/A Type I Cross Recessed Undercut Flat Countersunk Head Tapping Screw, 0.4375" Nominal Dia. N/A Type I N/A 7/16 in N/A 0.386 in N/A 0.234 in N/A 0.065 in N/A 4
N/A Type I Cross Recessed Undercut Flat Countersunk Head Tapping Screw, 0.5000" Nominal Dia. N/A Type I N/A 1/2 in N/A 0.402 in N/A 0.252 in N/A 0.068 in N/A 4
N/A Type IA Cross Recessed Undercut Flat Countersunk Head Tapping Screw, 0.0600" Nominal Dia. N/A Type IA N/A No. 0 N/A 0.062 in N/A 0.036 in N/A 0.018 in N/A 0
N/A Type IA Cross Recessed Undercut Flat Countersunk Head Tapping Screw, 0.0730" Nominal Dia. N/A Type IA N/A No. 1 N/A 0.070 in N/A 0.044 in N/A 0.018 in N/A 0
N/A Type IA Cross Recessed Undercut Flat Countersunk Head Tapping Screw, 0.0860" Nominal Dia. N/A Type IA N/A No. 2 N/A 0.088 in N/A 0.048 in N/A 0.028 in N/A 1
N/A Type IA Cross Recessed Undercut Flat Countersunk Head Tapping Screw, 0.0990" Nominal Dia. N/A Type IA N/A No. 3 N/A 0.096 in N/A 0.055 in N/A 0.029 in N/A 1
N/A Type IA Cross Recessed Undercut Flat Countersunk Head Tapping Screw, 0.1120" Nominal Dia. N/A Type IA N/A No. 4 N/A 0.110 in N/A 0.070 in N/A 0.029 in N/A 1
N/A Type IA Cross Recessed Undercut Flat Countersunk Head Tapping Screw, 0.1250" Nominal Dia. N/A Type IA N/A No. 5 N/A 0.122 in N/A 0.081 in N/A 0.030 in N/A 1
N/A Type IA Cross Recessed Undercut Flat Countersunk Head Tapping Screw, 0.1380" Nominal Dia. N/A Type IA N/A No. 6 N/A 0.140 in N/A 0.069 in N/A 0.040 in N/A 2
N/A Type IA Cross Recessed Undercut Flat Countersunk Head Tapping Screw, 0.1510" Nominal Dia. N/A Type IA N/A No. 7 N/A 0.148 in N/A 0.077 in N/A 0.041 in N/A 2
N/A Type IA Cross Recessed Undercut Flat Countersunk Head Tapping Screw, 0.1640" Nominal Dia. N/A Type IA N/A No. 8 N/A 0.168 in N/A 0.098 in N/A 0.041 in N/A 2
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