• 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.
  • 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.
  • Short screws are those threaded full length.
This type of recess has a large center opening, wide straight wings, and blunt bottom, with all edges relieved or rounded.
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Unit of Measure
Items
Type IA Cross Recessed Oval Countersunk Trim Head Tapping Screws:Long Screws with Shoulder and Short Screws

Type IA Long Screw, with 0.118" Recess Dia.
Type IA Cross Recessed Oval Countersunk Trim Head Tapping Screws:Long Screws with Shoulder and Short Screws

Type IA Long Screw, with 0.130" Recess Dia.
Type IA Cross Recessed Oval Countersunk Trim Head Tapping Screws:Long Screws with Shoulder and Short Screws

Type IA Long Screw, with 0.130" Recess Dia.
Type IA Cross Recessed Oval Countersunk Trim Head Tapping Screws:Long Screws with Shoulder and Short Screws

Type IA Long Screw, with 0.162" Recess Dia.
Type IA Cross Recessed Oval Countersunk Trim Head Tapping Screws:Long Screws with Shoulder and Short Screws

Type IA Long Screw, with 0.162" Recess 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
Type N/A Type IA Long Screws with Shoulder
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
Ref. Recess Dia. (M) N/A 0.118 in N/A 0.130 in N/A 0.130 in N/A 0.162 in N/A 0.162 in
Ref. Recess Depth ((T) N/A 0.077 in N/A 0.089 in N/A 0.089 in N/A 0.091 in N/A 0.091 in
Ref. Recess Width (N) N/A 0.030 in N/A 0.030 in N/A 0.030 in N/A 0.041 in N/A 0.041 in
Driver Size N/A 1 N/A 1 N/A 1 N/A 2 N/A 2
Max. Recess Penetration Gaging Depth N/A 0.074 in N/A 0.086 in N/A 0.086 in N/A 0.084 in N/A 0.084 in
Min. Recess Penetration Gaging Depth N/A 0.058 in N/A 0.070 in N/A 0.070 in N/A 0.066 in N/A 0.066 in
Max. Protrusion Above Gaging Dia. (F) N/A 0.064 in N/A 0.069 in N/A 0.069 in N/A 0.075 in N/A 0.075 in
Min. Protrusion Above Gaging Dia. (F) N/A 0.044 in N/A 0.048 in N/A 0.048 in N/A 0.053 in N/A 0.053 in
Gaging Dia. (G) N/A 0.148 in N/A 0.172 in N/A 0.172 in N/A 0.196 in N/A 0.196 in
  • 1 1 = Circle, 2 = Diamond, 3 = Triangle, 4 = Square
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