Product Code:SAE AS1337 Title:Selected Aerospace Diameter Pitch Combinations of Metric 60掳 Screw Threads for Nuts and Bolts Issuing Committee:E-25 General Standards For Aerospace And Propulsion Systems Scope:This Aerospace Standard establishes the preferred diameter-pitch combinations of ISO metric 60掳 screw threads recommended for use in the aerospace industry for metric module bolts and nuts.