• 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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Unit of Measure
Items
Slotted Undercut Oval Countersunk Head Tapping Screws

Slotted Undercut Oval Countersunk Head Tapping Screw, with 0.112" Head Dia.
Slotted Undercut Oval Countersunk Head Tapping Screws

Slotted Undercut Oval Countersunk Head Tapping Screw, with 0.137" Head Dia.
Slotted Undercut Oval Countersunk Head Tapping Screws

Slotted Undercut Oval Countersunk Head Tapping Screw, with 0.162" Head Dia.
Slotted Undercut Oval Countersunk Head Tapping Screws

Slotted Undercut Oval Countersunk Head Tapping Screw, with 0.187" Head Dia.
Slotted Undercut Oval Countersunk Head Tapping Screws

Slotted Undercut Oval Countersunk Head Tapping Screw, with 0.212" 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. 0 N/A No. 1 N/A No. 2 N/A No. 3 N/A No. 4
Nominal Size or Basic Screw Dia. (Decimal) N/A 0.0600 in N/A 0.0730 in N/A 0.0860 in N/A 0.0990 in N/A 0.1120 in
Applicable to Screw Types1 N/A 1
3
N/A 1
3
N/A 1
3
4
N/A 1
3
4
N/A 1
3
4
Length for Types AB and A (L)
N/A 3/16 in N/A 3/16 in N/A 3/16 in N/A 7/32 in N/A 1/4 in
Length for Other Types (LT) N/A 1/8 in N/A 5/32 in N/A 3/16 in N/A 7/32 in N/A 1/4 in
Max. Head Dia. (A) N/A 0.112 in N/A 0.137 in N/A 0.162 in N/A 0.187 in N/A 0.212 in
Min. Head Dia. (A) N/A 0.096 in N/A 0.120 in N/A 0.144 in N/A 0.167 in N/A 0.191 in
Ref. Head Side Height (H) N/A 0.025 in N/A 0.031 in N/A 0.036 in N/A 0.042 in N/A 0.047 in
Ref. Head Crown Height (C) N/A 0.021 in N/A 0.025 in N/A 0.029 in N/A 0.033 in N/A 0.037 in
Max. Total Head Height (O) N/A 0.046 in N/A 0.056 in N/A 0.065 in N/A 0.075 in N/A 0.084 in
Min. Total Head Height (O) N/A 0.033 in N/A 0.042 in N/A 0.050 in N/A 0.059 in N/A 0.067 in
Max. Slot Width (J) N/A 0.023 in N/A 0.026 in N/A 0.031 in N/A 0.035 in N/A 0.039 in
Min. Slot Width (J) N/A 0.016 in N/A 0.019 in N/A 0.023 in N/A 0.027 in N/A 0.031 in
Max. Slot Depth (T) N/A 0.028 in N/A 0.034 in N/A 0.040 in N/A 0.047 in N/A 0.053 in
Min. Slot Depth (T) N/A 0.022 in N/A 0.027 in N/A 0.033 in N/A 0.038 in N/A 0.043 in
Max. Protrusion Above Gaging Dia. (F) N/A 0.047 in N/A 0.053 in N/A 0.058 in N/A 0.064 in N/A 0.069 in
Min. Protrusion Above Gaging Dia. (F) N/A 0.031 in N/A 0.035 in N/A 0.039 in N/A 0.044 in N/A 0.048 in
Gaging Dia. (G) N/A 0.078 in N/A 0.101 in N/A 0.124 in N/A 0.148 in N/A 0.172 in
  • 1 1 = Circle, 3 = Triangle, 4 = Square
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