Item # CRUFCHTSI01640XXX, Type I Cross Recessed Undercut Flat Countersunk Head Tapping Screw, 0.1640" Nominal Dia. On Sales Systems Ltd.

When specifying nominal size in decimals, zeros preceding decimal and in the fourth decimal place shall be omitted.
Head dimensions not shown are the same as those of slotted heads.
Not practical to gage sizes No. 0 and No. 1.

This type of recess has a large center opening, tapered wings, and blunt bottom, with all edges relieved or rounded.

Unit of Measure

Manufacturer | Specifications | Codes and Standards

Industrial Fasteners Institute

Product	N/A Tapping Screws
Unit of Measure	N/A English
Type	N/A Type I
Nominal Size or Basic Screw Dia.	N/A No. 8
Nominal Size or Basic Screw Dia. (Decimal)	N/A 0.1640 in
Ref. Recess Dia. (M)	N/A 0.168 in
Ref. Recess Depth (T)	N/A 0.094 in
Ref. Recess Width (N)	N/A 0.029 in
Driver Size	N/A 2
Max. Recess Penetration Gaging Depth	N/A 0.095 in
Min. Recess Penetration Gaging Depth	N/A 0.072 in

Abstract of ASME B18.6.4 1998

Manufacturer