These are custom button head socket screws measuring 8-32 X 1″.  They were manufactured in the USA to our customer’s print using 302HQ material.  We typically supply this custom socket screw in quantities of 5,000 – 10,000 pieces and lead times vary between 5 and 7 weeks from order for the first release.  Once we have an established annual blanket purchase order set up we make sure to always have the parts on hand after the initial release, whether we have it set up with pre-determined release dates or simply to be shipped as-released for full flexibility.  The factory we used for these parts excels in high precision cold headed parts.