• 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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Unit of Measure
Items
Heads of Oval Countersunk Trim Head Tapping Screws

Heads of Oval Countersunk Trim Head Tapping Screw, with 0.187" Head Dia.
Heads of Oval Countersunk Trim Head Tapping Screws

Heads of Oval Countersunk Trim Head Tapping Screw, with 0.212" Head Dia.
Heads of Oval Countersunk Trim Head Tapping Screws

Heads of Oval Countersunk Trim Head Tapping Screw, with 0.212" Head Dia.
Heads of Oval Countersunk Trim Head Tapping Screws

Heads of Oval Countersunk Trim Head Tapping Screw, with 0.237" Head Dia.
Heads of Oval Countersunk Trim Head Tapping Screws

Heads of Oval Countersunk Trim Head Tapping Screw, with 0.237" Head Dia.
Manufacturer N/A Industrial Fasteners Institute
Product N/A Tapping Screws
Codes and Standards N/A Abstract of ASME B18.6.4 1998
Unit of Measure N/A English
Nominal Size or Basic Screw Dia. N/A No. 4 N/A No. 5 N/A No. 6 N/A No. 6 N/A No. 8
Nominal Size or Basic Screw Dia. (Decimal) N/A 0.1120 in N/A 0.1250 in N/A 0.1380 in N/A 0.1380 in N/A 0.1640 in
Head Size N/A 3 N/A 4 N/A 4 N/A 5 N/A 5
Applicable to Screw Types1 N/A 1
2
3
4
Max. Head Dia. (A) N/A 0.187 in N/A 0.212 in N/A 0.212 in N/A 0.237 in N/A 0.237 in
Min. Head Dia. (A) N/A 0.167 in N/A 0.191 in N/A 0.191 in N/A 0.215 in N/A 0.215 in
Ref. Head Side Height (H) N/A 0.057 in N/A 0.066 in N/A 0.058 in N/A 0.075 in N/A 0.060 in
Ref. Head Crown Height (C) N/A 0.033 in N/A 0.037 in N/A 0.037 in N/A 0.041 in N/A 0.041 in
Ref. Total Head Height (O) N/A 0.086 in N/A 0.099 in N/A 0.091 in N/A 0.112 in N/A 0.096 in
Ref. Head Radius (R) N/A 0.014 in N/A 0.017 in N/A 0.017 in N/A 0.019 in N/A 0.019 in
Min. Shoulder Dia. for Type A Long Screws (E) N/A 0.105 in N/A 0.118 in N/A 0.131 in N/A 0.131 in N/A 0.157 in
Min. Shoulder Dia. for Other Types Long Screws (E) N/A 0.106 in N/A 0.119 in N/A 0.131 in N/A 0.131 in N/A 0.157 in
  • 1 1 = Circle, 2 = Diamond, 3 = Triangle, 4 = Square
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