• Cross Recessed Flat Countersunk Trim 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 A thread forming, except for short lengths.
    Types B and BP thread forming; and Types BF and BT thread cutting
    Type C thread forming; and Types D, F, G, and T thread cutting.
  • Short screws are those threaded full length.
  • Where specifying nominal size in decimals, zeros preceding decimal and in the fourth decimal place shall be omitted.
  • Maximum diameter shall not exceed minimum plus 0.011" for Type A screws, and basic screw diameter for all other screw types.
  • 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.
Note: Flat countersunk trim head tapping screws are furnished in cross recessed heads only.
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Item #

Description

Nominal Size or Basic Screw Dia.

Head Size

Min. E (Type A)

Max. (A)

Ref. (H)

Max. (F)

N/A Cross Recessed Flat Countersunk Trim Head Tapping Screw, with 0.187" Head Dia. N/A No. 4 N/A 3 N/A 0.105 in N/A 0.187 in N/A 0.052 in N/A 0.031 in
N/A Cross Recessed Flat Countersunk Trim Head Tapping Screw, with 0.212" Head Dia. N/A No. 5 N/A 4 N/A 0.118 in N/A 0.212 in N/A 0.060 in N/A 0.032 in
N/A Cross Recessed Flat Countersunk Trim Head Tapping Screw, with 0.212" Head Dia. N/A No. 6 N/A 4 N/A 0.131 in N/A 0.212 in N/A 0.052 in N/A 0.032 in
N/A Cross Recessed Flat Countersunk Trim Head Tapping Screw, with 0.237" Head Dia. N/A No. 6 N/A 5 N/A 0.131 in N/A 0.237 in N/A 0.068 in N/A 0.034 in
N/A Cross Recessed Flat Countersunk Trim Head Tapping Screw, with 0.237" Head Dia. N/A No. 8 N/A 5 N/A 0.157 in N/A 0.237 in N/A 0.052 in N/A 0.034 in
N/A Cross Recessed Flat Countersunk Trim Head Tapping Screw, with 0.262" Head Dia. N/A No. 8 N/A 6 N/A 0.157 in N/A 0.262 in N/A 0.069 in N/A 0.036 in
N/A Cross Recessed Flat Countersunk Trim Head Tapping Screw, with 0.312" Head Dia. N/A No. 10 N/A 8 N/A 0.183 in N/A 0.312 in N/A 0.085 in N/A 0.039 in
N/A Cross Recessed Flat Countersunk Trim Head Tapping Screw, with 0.312" Head Dia. N/A No. 12 N/A 8 N/A 0.209 in N/A 0.312 in N/A 0.069 in N/A 0.039 in
N/A Cross Recessed Flat Countersunk Trim Head Tapping Screw, with 0.362" Head Dia. N/A No. 12 N/A 10 N/A 0.209 in N/A 0.362 in N/A 0.101 in N/A 0.042 in
N/A Cross Recessed Flat Countersunk Trim Head Tapping Screw, with 0.362" Head Dia. N/A No. 14 N/A 10 N/A 0.235 in N/A 0.362 in N/A 0.080 in N/A 0.042 in
N/A Cross Recessed Flat Countersunk Trim Head Tapping Screw, with 0.412" Head Dia. N/A No. 14 N/A 12 N/A 0.235 in N/A 0.412 in N/A 0.112 in N/A 0.045 in
N/A Cross Recessed Flat Countersunk Trim Head Tapping Screw, with 0.362" Head Dia. N/A 1/4 in N/A 10 N/A N/A 0.362 in N/A 0.080 in N/A 0.042 in
N/A Cross Recessed Flat Countersunk Trim Head Tapping Screw, with 0.412" Head Dia. N/A 1/4 in N/A 12 N/A N/A 0.412 in N/A 0.112 in N/A 0.045 in
N/A Cross Recessed Flat Countersunk Trim Head Tapping Screw, with 0.412" Head Dia. N/A 5/16 in N/A 12 N/A N/A 0.412 in N/A 0.075 in N/A 0.045 in
N/A Cross Recessed Flat Countersunk Trim Head Tapping Screw, with 0.477" Head Dia. N/A 5/16 in N/A 1/4 in N/A N/A 0.477 in N/A 0.116 in N/A 0.050 in
N/A Cross Recessed Flat Countersunk Trim Head Tapping Screw, with 0.597" Head Dia. N/A 3/8 in N/A 5/16 in N/A N/A 0.597 in N/A 0.155 in N/A 0.057 in
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