Screw heads have various functions such as workability, weight reduction, and resistance to loosening.
In this issue, we will introduce commonly used head shapes and publish the No. 0 and JIS head shape dimension tables, which are very important for quality control.
No. 0 cross-recessed screw head shape dimensions
・Let Q be the depth to which the gauge sinks into the cross-hole.
・The eccentricity F of the head is assumed to be the eccentricity with respect to the center of the axis.
・0 cross-recessed shape dimensions are based on JISB1012 type S.
Diagram of Type 1, Type 2, and Type 3
Pan Head
Flat Head
head shape dimensions
（JIS B 1111 Anex：Type, Shape and Dimensions Product specifications are the same as ISO 7045:2011，ISO 7046-1:2011，ISO 7046-2:2011，ISO 7047:2011，ISO 7048:2011）
