Prius C Shifter Thread x Pitch

M6 x 1.0

That's 6 x 1.0 mm

SCH-I535

 

Oops, probably right. The one I looked at was a thread on the regular hatchback.

 

Standard M8x1.25 is correct for the Prius"C" and ALL current automatic Toyota, Lexus and Scion.

M6x1.0 is correct for Gen II, Gen III and Prius"v."

You have to be carful of the "UNIVERSAL" knob that comes with plastic adapters. They can be sloppy and use set or grub screws.

 

Since I made so many of these knobs (see link: New shift knob | PriusChat ), I gave one to my mom (Yaris Sedan, also m8x1.25), my sister and brother in law, who drives a V3 and a Rav4EV. The latter two vehicles were M6x1.0.

To adapt the M8x1.25 ball to M6x1.0, I went to Harbor Freight and got 1/4" thread inserts for $4 (for 10: 10 Piece 1/4"-20 Thread Repair Inserts ). The inserts fit perfectly in the M8x1.25 ball. The trick is knowing how deep to stop (one might not want to thread it all the way in). With the insert, the ball fits perfectly on the M6x1.0 shaft.

If one was so inclined, an insert can be put into a billiard ball. I imagine a golf ball would look neat as well. 5/16" would be close to M8, so a brass 5/16"-18 can be re-threaded to M8x1.25. Here's a set of assorted brass inserts: 36 Piece Brass Threaded Inserts

There possibilities are endless, if you want something unique and not from ebay...

 

I am looking on offering Walnut and Arizona Ironwood shift knobs through the PriusChat Shop, when I standardize the design and build up enough inventory.

I've tested a few designs and applied them to a torture test for safety reasons and to meet with NHTSA standards.

Aluminum and other metals seem to be the only alternative, since, in an impact, a lot o the offering and designs on eBay, especially from overseas, will "split" or spall off expose the stud of the shift lever, that might impale the driver o the front passenger.

On that account, the ones that I may offer will have a custom machined lengthwise threaded aluminum core that will strengthen the wood to prevent splitting and likely exposing the dangerous one of the threaded stud.