Item # CRFCHTSI03125XXX, Type I Cross Recessed Flat Countersunk Head Tapping Screw, 0.3125" Nominal Dia. On Sales Systems Ltd.

Where 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

N/A 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 5/16 in
Nominal Size or Basic Screw Dia. (Decimal)	N/A 0.3125 in
Ref. Recess Dia. (M)	N/A 0.358 in
Ref. Recess Depth (T)	N/A 0.205 in
Ref. Recess Width (N)	N/A 0.061 in
Driver Size	N/A 4
Max. Recess Penetration Gaging Depth	N/A 0.196 in
Min. Recess Penetration Gaging Depth	N/A 0.174 in

N/A Abstract of ASME B18.6.4 1998

Manufacturer