• Slotted Undercut Flat Countersunk Head Tapping Screws
  • Type Designations for Tapping Screws and Metallic Drive Screws
  • Applicable to screw types as indicated by code symbols.
    Type AB thread forming.
    Type C thread forming; and Types D, F, G, and T thread cutting.
  • Where specifying nominal size in decimals, zeros preceding decimal and in the fourth decimal place shall be omitted.
  • Screws of longer lengths shall have head heights.
  • No tolerance for gaging diameter is given. If the gaging diameter of the gage used differs from tabulated value, the protrusion will be affected accordingly and the proper protrusion values must be recalculated using the formulas shown in Appendix.
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Item #

Description

Nominal Size or Basic Screw Dia.

L

Max. (A)

Max. (H)

Max. (J)

Max. (T)

N/A Slotted Undercut Flat Countersunk Head Tapping Screw, with 0.112" Head Dia. N/A No. 0 N/A 3/16 in N/A 0.112 in N/A 0.025 in N/A 0.023 in N/A 0.011 in
N/A Slotted Undercut Flat Countersunk Head Tapping Screw, with 0.137" Head Dia. N/A No. 1 N/A 3/16 in N/A 0.137 in N/A 0.031 in N/A 0.026 in N/A 0.014 in
N/A Slotted Undercut Flat Countersunk Head Tapping Screw, with 0.162" Head Dia. N/A No. 2 N/A 3/16 in N/A 0.162 in N/A 0.036 in N/A 0.031 in N/A 0.016 in
N/A Slotted Undercut Flat Countersunk Head Tapping Screw, with 0.187" Head Dia. N/A No. 3 N/A 7/32 in N/A 0.187 in N/A 0.042 in N/A 0.035 in N/A 0.019 in
N/A Slotted Undercut Flat Countersunk Head Tapping Screw, with 0.212" Head Dia. N/A No. 4 N/A 1/4 in N/A 0.212 in N/A 0.047 in N/A 0.039 in N/A 0.022 in
N/A Slotted Undercut Flat Countersunk Head Tapping Screw, with 0.237" Head Dia. N/A No. 5 N/A 1/4 in N/A 0.237 in N/A 0.053 in N/A 0.043 in N/A 0.024 in
N/A Slotted Undercut Flat Countersunk Head Tapping Screw, with 0.262" Head Dia. N/A No. 6 N/A 5/16 in N/A 0.262 in N/A 0.059 in N/A 0.048 in N/A 0.027 in
N/A Slotted Undercut Flat Countersunk Head Tapping Screw, with 0.287" Head Dia. N/A No. 7 N/A 3/8 in N/A 0.287 in N/A 0.064 in N/A 0.048 in N/A 0.030 in
N/A Slotted Undercut Flat Countersunk Head Tapping Screw, with 0.312" Head Dia. N/A No. 8 N/A 7/16 in N/A 0.312 in N/A 0.070 in N/A 0.054 in N/A 0.032 in
N/A Slotted Undercut Flat Countersunk Head Tapping Screw, with 0.362" Head Dia. N/A No. 10 N/A 1/2 in N/A 0.362 in N/A 0.081 in N/A 0.060 in N/A 0.037 in
N/A Slotted Undercut Flat Countersunk Head Tapping Screw, with 0.412" Head Dia. N/A No. 12 N/A 9/16 in N/A 0.412 in N/A 0.092 in N/A 0.067 in N/A 0.043 in
N/A Slotted Undercut Flat Countersunk Head Tapping Screw, with 0.477" Head Dia. N/A 1/4 in N/A 5/8 in N/A 0.477 in N/A 0.107 in N/A 0.075 in N/A 0.050 in
N/A Slotted Undercut Flat Countersunk Head Tapping Screw, with 0.597" Head Dia. N/A 5/16 in N/A 13/16 in N/A 0.597 in N/A 0.134 in N/A 0.084 in N/A 0.062 in
N/A Slotted Undercut Flat Countersunk Head Tapping Screw, with 0.717" Head Dia. N/A 3/8 in N/A N/A 0.717 in N/A 0.161 in N/A 0.094 in N/A 0.075 in
N/A Slotted Undercut Flat Countersunk Head Tapping Screw, with 0.760" Head Dia. N/A 7/16 in N/A N/A 0.760 in N/A 0.156 in N/A 0.094 in N/A 0.072 in
N/A Slotted Undercut Flat Countersunk Head Tapping Screw, with 0.815" Head Dia. N/A 1/2 in N/A N/A 0.815 in N/A 0.156 in N/A 0.106 in N/A 0.072 in
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