• Applicable to screw types as indicated by code symbols.
    Type AB thread forming.
    Type C thread forming; 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.
  • Screws of these lengths and shorter shall have undercut heads. Use Type AB undercut head screws in place of Type A screws for these lengths and shorter.
  • 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 Flat Countersunk Head Tapping Screws

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

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

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

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

Slotted Flat 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
2
3
N/A 1
2
3
N/A 1
2
3
4
N/A 1
2
3
4
N/A 1
2
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 Height (H) N/A 0.035 in N/A 0.043 in N/A 0.051 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 0.015 in N/A 0.019 in N/A 0.023 in N/A 0.027 in N/A 0.030 in
Min. Slot Depth (T) N/A 0.010 in N/A 0.012 in N/A 0.015 in N/A 0.017 in N/A 0.020 in
Max. Protrusion Above Gaging Dia. (F) N/A 0.026 in N/A 0.028 in N/A 0.029 in N/A 0.031 in N/A 0.032 in
Min. Protrusion Above Gaging Dia. (F) N/A 0.016 in N/A 0.016 in N/A 0.017 in N/A 0.018 in N/A 0.019 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, 2 = Diamond, 3 = Triangle, 4 = Square
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