Sales Systems Ltd. - Cross Recessed Flat Countersunk Trim Head Tapping Screws

Applicable to screw types as indicated by code symbols.
Type AB thread forming.
Type A thread forming, except for short lengths.
Types B and BP thread forming; and Types BF and BT thread cutting
Type C thread forming; and Types D, F, G, and T thread cutting.
Short screws are those threaded full length.
Where specifying nominal size in decimals, zeros preceding decimal and in the fourth decimal place shall be omitted.
Maximum diameter shall not exceed minimum plus 0.011" for Type A screws, and basic screw diameter for all other screw types.
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.

Note: Flat countersunk trim head tapping screws are furnished in cross recessed heads only.

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Unit of Measure

Items	item-2791 Cross Recessed Flat Countersunk Trim Head Tapping Screw, with 0.187" Head Dia.	item-2792 Cross Recessed Flat Countersunk Trim Head Tapping Screw, with 0.212" Head Dia.	item-2793 Cross Recessed Flat Countersunk Trim Head Tapping Screw, with 0.212" Head Dia.	item-2794 Cross Recessed Flat Countersunk Trim Head Tapping Screw, with 0.237" Head Dia.	item-2795 Cross Recessed Flat 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
Min. Shoulder Dia. for Type A (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 (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
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 Height (H)	N/A 0.052 in	N/A 0.060 in	N/A 0.052 in	N/A 0.068 in	N/A 0.052 in
Max. Protrusion Above Gaging Dia. (F)	N/A 0.031 in	N/A 0.032 in	N/A 0.032 in	N/A 0.034 in	N/A 0.034 in
Min. Protrusion Above Gaging Dia. (F)	N/A 0.018 in	N/A 0.019 in	N/A 0.019 in	N/A 0.020 in	N/A 0.020 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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