This standard for Metric Pan Head Type 1A Cross Recess Machine Screws conforms in all essentials with the American National Standard covering metric machine screws. It should be noted that the head diameter and head height limits specified herein differ to varying extents from those documented in prior issues. In general, screws made in conformance with this standard are considered to be functionally interchangeable with parts produced to the latest ISO Standard for recessed pan head screws. Also, for the most part, the Type 1A cross recess configuration will serve to identify these screws as being metric.