• Slotted Undercut Oval 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.
    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.
  • Where specifying nominal size in decimals, zeros preceding decimal and in the fourth decimal place shall be omitted.
  • Longer lengths shall have head heights
  • 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)

Ref. (C)

Max. (O)

N/A Slotted Undercut Oval 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 0.021 in N/A 0.046 in
N/A Slotted Undercut Oval 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 0.025 in N/A 0.056 in
N/A Slotted Undercut Oval 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 0.029 in N/A 0.065 in
N/A Slotted Undercut Oval 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 0.033 in N/A 0.075 in
N/A Slotted Undercut Oval 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 0.037 in N/A 0.084 in
N/A Slotted Undercut Oval 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 0.041 in N/A 0.094 in
N/A Slotted Undercut Oval 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 0.045 in N/A 0.104 in
N/A Slotted Undercut Oval 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 0.049 in N/A 0.113 in
N/A Slotted Undercut Oval 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 0.052 in N/A 0.123 in
N/A Slotted Undercut Oval 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 0.142 in
N/A Slotted Undercut Oval 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 0.068 in N/A 0.161 in
N/A Slotted Undercut Oval 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 0.079 in N/A 0.186 in
N/A Slotted Undercut Oval 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 0.099 in N/A 0.232 in
N/A Slotted Undercut Oval 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 0.117 in N/A 0.278 in
N/A Slotted Undercut Oval 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 0.122 in N/A 0.279 in
N/A Slotted Undercut Oval 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 0.131 in N/A 0.288 in
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