• 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 IA Cross Recessed Undercut Flat Countersunk Head Tapping Screw, 0.1900" Nominal Dia. N/A Type IA N/A No. 10 N/A 0.182 in N/A 0.112 in N/A 0.041 in N/A 2
N/A Type IA Cross Recessed Undercut Flat Countersunk Head Tapping Screw, 0.2160" Nominal Dia. N/A Type IA N/A No. 12 N/A 0.226 in N/A 0.112 in N/A 0.055 in N/A 3
N/A Type IA Cross Recessed Undercut Flat Countersunk Head Tapping Screw, 0.2500" Nominal Dia. N/A Type IA N/A 1/4 in N/A 0.242 in N/A 0.128 in N/A 0.056 in N/A 3
N/A Type IA Cross Recessed Undercut Flat Countersunk Head Tapping Screw, 0.3125" Nominal Dia. N/A Type IA N/A 5/16 in N/A 0.310 in N/A 0.163 in N/A 0.085 in N/A 4
N/A Type IA Cross Recessed Undercut Flat Countersunk Head Tapping Screw, 0.3750" Nominal Dia. N/A Type IA N/A 3/8 in N/A 0.358 in N/A 0.211 in N/A 0.086 in N/A 4
N/A Type IA Cross Recessed Undercut Flat Countersunk Head Tapping Screw, 0.4375" Nominal Dia. N/A Type IA N/A 7/16 in N/A 0.386 in N/A 0.239 in N/A 0.086 in N/A 4
N/A Type IA Cross Recessed Undercut Flat Countersunk Head Tapping Screw, 0.5000" Nominal Dia. N/A Type IA N/A 1/2 in N/A 0.402 in N/A 0.256 in N/A 0.086 in N/A 4
N/A Type II Cross Recessed Undercut Flat Countersunk Head Tapping Screw, 0.0600" Nominal Dia. N/A Type II N/A No. 0 N/A 0.067 in N/A 0.029 in N/A 0.020 in N/A Point Same on all Drivers
N/A Type II Cross Recessed Undercut Flat Countersunk Head Tapping Screw, 0.0730" Nominal Dia. N/A Type II N/A No. 1 N/A 0.082 in N/A 0.039 in N/A 0.022 in N/A Point Same on all Drivers
N/A Type II Cross Recessed Undercut Flat Countersunk Head Tapping Screw, 0.0860" Nominal Dia. N/A Type II N/A No. 2 N/A 0.100 in N/A 0.050 in N/A 0.025 in N/A Point Same on all Drivers
N/A Type II Cross Recessed Undercut Flat Countersunk Head Tapping Screw, 0.0990" Nominal Dia. N/A Type II N/A No. 3 N/A 0.111 in N/A 0.058 in N/A 0.026 in N/A Point Same on all Drivers
N/A Type II Cross Recessed Undercut Flat Countersunk Head Tapping Screw, 0.1120" Nominal Dia. N/A Type II N/A No. 4 N/A 0.129 in N/A 0.070 in N/A 0.029 in N/A Point Same on all Drivers
N/A Type II Cross Recessed Undercut Flat Countersunk Head Tapping Screw, 0.1250" Nominal Dia. N/A Type II N/A No. 5 N/A 0.147 in N/A 0.080 in N/A 0.032 in N/A Point Same on all Drivers
N/A Type II Cross Recessed Undercut Flat Countersunk Head Tapping Screw, 0.1380" Nominal Dia. N/A Type II N/A No. 6 N/A 0.161 in N/A 0.088 in N/A 0.034 in N/A Point Same on all Drivers
N/A Type II Cross Recessed Undercut Flat Countersunk Head Tapping Screw, 0.1510" Nominal Dia. N/A Type II N/A No. 7 N/A 0.178 in N/A 0.100 in N/A 0.036 in N/A Point Same on all Drivers
N/A Type II Cross Recessed Undercut Flat Countersunk Head Tapping Screw, 0.1640" Nominal Dia. N/A Type II N/A No. 8 N/A 0.197 in N/A 0.112 in N/A 0.039 in N/A Point Same on all Drivers
N/A Type II Cross Recessed Undercut Flat Countersunk Head Tapping Screw, 0.1900" Nominal Dia. N/A Type II N/A No. 10 N/A 0.236 in N/A 0.132 in N/A 0.045 in N/A Point Same on all Drivers
N/A Type II Cross Recessed Undercut Flat Countersunk Head Tapping Screw, 0.2160" Nominal Dia. N/A Type II N/A No. 12 N/A 0.260 in N/A 0.148 in N/A 0.048 in N/A Point Same on all Drivers
N/A Type II Cross Recessed Undercut Flat Countersunk Head Tapping Screw, 0.2500" Nominal Dia. N/A Type II N/A 1/4 in N/A 0.304 in N/A 0.169 in N/A 0.054 in N/A Point Same on all Drivers
N/A Type II Cross Recessed Undercut Flat Countersunk Head Tapping Screw, 0.3125" Nominal Dia. N/A Type II N/A 5/16 in N/A 0.381 in N/A 0.218 in N/A 0.066 in N/A Point Same on all Drivers
N/A Type II Cross Recessed Undercut Flat Countersunk Head Tapping Screw, 0.3750" Nominal Dia. N/A Type II N/A 3/8 in N/A 0.453 in N/A 0.266 in N/A 0.077 in N/A Point Same on all Drivers
N/A Type II Cross Recessed Undercut Flat Countersunk Head Tapping Screw, 0.4375" Nominal Dia. N/A Type II N/A 7/16 in N/A 0.498 in N/A 0.295 in N/A 0.083 in N/A Point Same on all Drivers
N/A Type II Cross Recessed Undercut Flat Countersunk Head Tapping Screw, 0.5000" Nominal Dia. N/A Type II N/A 1/2 in N/A 0.548 in N/A 0.328 in N/A 0.090 in N/A Point Same on all Drivers
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