Download the NAS1309 datasheet PDF.
This datasheet also includes the NAS1303 variant, as both parts are published together in a single manufacturer document.
20 NAS 1303 - NAS 1316 Series Specifications
Bolt, Hex Head, Close Tolerance 160,000 PSI Tensile HEAD MARKING: BASIC PART NO., APPLICABLE DASH NO., AND MANFACTURER’S TRADEMARK RAISED OR DEPRESSED .