• Slotted 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 these lengths and shorter shall have undercut heads. Use Type AB undercut head screws in place of Type A screws for these lengths and shorter.
  • Tabulated values determined from formula for H max, Appendix.
  • 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)

Ref. (H)

Max. (J)

Max. (T)

N/A Slotted 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 0.035 in N/A 0.023 in N/A 0.015 in
N/A Slotted 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 0.043 in N/A 0.026 in N/A 0.019 in
N/A Slotted 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 0.051 in N/A 0.031 in N/A 0.023 in
N/A Slotted 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 0.059 in N/A 0.035 in N/A 0.027 in
N/A Slotted 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 0.067 in N/A 0.039 in N/A 0.030 in
N/A Slotted 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 0.075 in N/A 0.043 in N/A 0.034 in
N/A Slotted 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 0.083 in N/A 0.048 in N/A 0.038 in
N/A Slotted 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 0.091 in N/A 0.048 in N/A 0.041 in
N/A Slotted 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 0.100 in N/A 0.054 in N/A 0.045 in
N/A Slotted 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 0.116 in N/A 0.060 in N/A 0.053 in
N/A Slotted 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 0.132 in N/A 0.067 in N/A 0.060 in
N/A Slotted Flat Countersunk Head Tapping Screw, with 0.462" Head Dia. N/A No. 14 N/A 5/8 in N/A 0.462 in N/A 0.148 in N/A 0.075 in N/A 0.068 in
N/A Slotted 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 0.153 in N/A 0.075 in N/A 0.070 in
N/A Slotted Flat Countersunk Head Tapping Screw, with 0.512" Head Dia. N/A No. 16 N/A 3/4 in N/A 0.512 in N/A 0.164 in N/A 0.075 in N/A 0.075 in
N/A Slotted Flat Countersunk Head Tapping Screw, with 0.561" Head Dia. N/A No. 18 N/A 13/16 in N/A 0.561 in N/A 0.180 in N/A 0.084 in N/A 0.083 in
N/A Slotted 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 0.191 in N/A 0.084 in N/A 0.088 in
N/A Slotted Flat Countersunk Head Tapping Screw, with 0.611" Head Dia. N/A No. 20 N/A 13/16 in N/A 0.611 in N/A 0.196 in N/A 0.084 in N/A 0.090 in
N/A Slotted Flat Countersunk Head Tapping Screw, with 0.711" Head Dia. N/A No. 24 N/A 1 in N/A 0.711 in N/A 0.228 in N/A 0.094 in N/A 0.105 in
N/A Slotted Flat Countersunk Head Tapping Screw, with 0.717" Head Dia. N/A 3/8 in N/A N/A 0.717 in N/A 0.230 in N/A 0.094 in N/A 0.106 in
N/A Slotted Flat Countersunk Head Tapping Screw, with 0.760" Head Dia. N/A 7/16 in N/A N/A 0.760 in N/A 0.223 in N/A 0.094 in N/A 0.103 in
N/A Slotted Flat Countersunk Head Tapping Screw, with 0.815" Head Dia. N/A 1/2 in N/A N/A 0.815 in N/A 0.223 in N/A 0.106 in N/A 0.103 in
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