1/4-20 x 1 1/4 MS51957, NAS-1635 Phil Pan Machine Screw Coarse Full Thread 300 Series S/S DFAR DPLFDN The 9/16-12 thread size makes

The 9/16-12 thread size makes it compatible with bolts and threaded rods of the same diameter and pitch

It has a Phillips flat undercut head and a type F full thread

They meet ASTM A307 specifications for quality and strength

These 6-18 x 2 Phillips Pan Self Tapping Screws are Type A screws

1/4-20 x 1 1/4 MS51957, NAS-1635 Phil Pan Machine Screw Coarse Full Thread 300 Series S/S DFAR DPLFDN The 9/16-12 thread size makes**1 4 20 x 1 1 4 MS51957, NAS 1635 Phil Pan Machine Screw** * **Type:** Coarse thread, full thread * **Material:** 300 Series stainless steel * **Head:** Phil pan (cross recess) * **Thread Size:** 1 4 20 UNC * **Length:** 1 1 4 inches * **Drive:** Phillips screwdriver * **Finish:** DFAR compliant (Defense Federal Acquisition Regulation Supplement) * **Standards:** MS51957, NAS 1635 * **Features:** High strength, corrosion resistance, precise