The SL31C-12 P03 stud is an aircraft engine threaded stud used in Continental-compatible piston engine assemblies. It is a double-ended stud with 5/16-18 UNC coarse threads, designed to be installed into engine cases or structural components to provide a durable and replaceable threaded mounting point.

The P03 suffix indicates a controlled dimensional tolerance variant used to ensure correct thread engagement and fit during engine assembly or overhaul.

Key features include:

PMA aircraft engine stud fastener
Diameter: 5/16 inch
Thread: 5/16-18 UNC coarse thread
Precision-machined steel construction
Double-ended threaded stud design
Installed into engine case for reusable mounting points
Prevents wear of internal aluminum or case threads
Designed for high vibration and cyclic engine loads
Controlled tolerance variant (P03 fit class)
Compatible with Continental piston engine configurations (IPC-dependent use)
Used in engine assembly, accessory mounting, and overhaul procedures