Drain plug torque

[AustinJohn]

Originally Posted by VetteMed

Did you mean to ask what size the hex head is, on the drain plug? The 5/8-18 is the thread size/pitch.

I think the stock plug uses a 13 or 14mm socket. Nothing exotic.

Yes, hex head size, Andrew. My '94 uses a 14mm socket. John

[AustinJohn]

Originally Posted by WVZR-1

the 5/8-18 is correct for the thread & pitch, 9/16 for the box-wrench and I don't believe a ZF fill or drain plug is aluminum. Mine are "magnetic"! Those are in an NOS "Blue tag" but I believe I've checked those in the car also!

I can confirm that it's 9/16. Thanks.