• Heads of Oval Countersunk Trim Head Tapping Screws
  • Type Designations for Tapping Screws and Metallic Drive Screws
  • Where specifying nominal size in decimals, zeros preceding decimal and in the fourth decimal place shall be omitted.
  • Applicable to screw types as indicated by code symbols.
    Type AB thread forming.
    Types B and BP thread forming and Types BF and BT thread cutting.
    Type C thread forming, Appendix; and Types D, F, G, and T thread cutting.
  • Short screws are those threaded full length.
  • Maximum diameter shall not exceed minimum plus 0.11" for Type A screws, and basic screw diameter for all other screw types.
  • Tabulated values for H and O determined from formula.
Note: Oval 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

Max. (A)

Ref. (H)

Ref. (C)

Ref. (O)

N/A Heads of Oval Countersunk Trim Head Tapping Screw, with 0.187" Head Dia. N/A No. 4 N/A 3 N/A 0.187 in N/A 0.057 in N/A 0.033 in N/A 0.086 in
N/A Heads of Oval Countersunk Trim Head Tapping Screw, with 0.212" Head Dia. N/A No. 5 N/A 4 N/A 0.212 in N/A 0.066 in N/A 0.037 in N/A 0.099 in
N/A Heads of Oval Countersunk Trim Head Tapping Screw, with 0.212" Head Dia. N/A No. 6 N/A 4 N/A 0.212 in N/A 0.058 in N/A 0.037 in N/A 0.091 in
N/A Heads of Oval Countersunk Trim Head Tapping Screw, with 0.237" Head Dia. N/A No. 6 N/A 5 N/A 0.237 in N/A 0.075 in N/A 0.041 in N/A 0.112 in
N/A Heads of Oval Countersunk Trim Head Tapping Screw, with 0.237" Head Dia. N/A No. 8 N/A 5 N/A 0.237 in N/A 0.060 in N/A 0.041 in N/A 0.096 in
N/A Heads of Oval Countersunk Trim Head Tapping Screw, with 0.262" Head Dia. N/A No. 8 N/A 6 N/A 0.262 in N/A 0.076 in N/A 0.045 in N/A 0.117 in
N/A Heads of Oval Countersunk Trim Head Tapping Screw, with 0.312" Head Dia. N/A No. 10 N/A 8 N/A 0.312 in N/A 0.094 in N/A 0.076 in N/A 0.141 in
N/A Heads of Oval Countersunk Trim Head Tapping Screw, with 0.312" Head Dia. N/A No. 12 N/A 8 N/A 0.312 in N/A 0.078 in N/A 0.076 in N/A 0.125 in
N/A Heads of Oval Countersunk Trim Head Tapping Screw, with 0.362" Head Dia. N/A No. 12 N/A 10 N/A 0.362 in N/A 0.111 in N/A 0.060 in N/A 0.166 in
N/A Heads of Oval Countersunk Trim Head Tapping Screw, with 0.362" Head Dia. N/A No. 14 N/A 10 N/A 0.362 in N/A 0.091 in N/A 0.060 in N/A 0.146 in
N/A Heads of Oval Countersunk Trim Head Tapping Screw, with 0.412" Head Dia. N/A No. 14 N/A 12 N/A 0.412 in N/A 0.124 in N/A 0.068 in N/A 0.187 in
N/A Heads of Oval Countersunk Trim Head Tapping Screw, with 0.362" Head Dia. N/A 1/4 in N/A 10 N/A 0.362 in N/A 0.091 in N/A 0.060 in N/A 0.146 in
N/A Heads of Oval Countersunk Trim Head Tapping Screw, with 0.412" Head Dia. N/A 1/4 in N/A 12 N/A 0.412 in N/A 0.124 in N/A 0.068 in N/A 0.187 in
N/A Heads of Oval Countersunk Trim Head Tapping Screw, with 0.412" Head Dia. N/A 5/16 in N/A 12 N/A 0.412 in N/A 0.087 in N/A 0.068 in N/A 0.150 in
N/A Heads of Oval Countersunk Trim Head Tapping Screw, with 0.477" Head Dia. N/A 5/16 in N/A 1/4 in N/A 0.477 in N/A 0.130 in N/A 0.079 in N/A 0.202 in
N/A Heads of Oval Countersunk Trim Head Tapping Screw, with 0.597" Head Dia. N/A 3/8 in N/A 5/16 in N/A 0.597 in N/A 0.173 in N/A 0.099 in N/A 0.265 in
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