Stingray bridge screws (the two large ones)

[Mark Simms]

Hi,
Is there an 'M' part number for the two large bridge screws/bolts on a Stingray bass? Or does anyone know what machine thread they are?
Thanks

 

[BobKos]

I have a Reflex Bass with the same type bridge. The large bolts are 5/16 X 18TPI SAE threads.