Thread Size(s)?

[wideglide38]

Does anyone know what the thread size(s) are for the Instant Reserve Seats / bottom Tank opening? The attached has seat 62075-40 style on top and the -50 style on bottom. I read through Palmer's and saw no thread size reference. Threads look machine size or are they tapered? Any help is appreciated.

Thanks,
William

[Jerry Wieland]

Not tapered.

[exeric]

It's 3/4" x 18.

[sirhrmechanic]

http://www.ebay.com/itm/Screw-thread...item258a78de37

One of the better investments you can make in the old vehicle world....

Cheers,

Sirhr

[wideglide38]

Thanks Gents!

[BigLakeBob]

Just a note that this one you put the link up to is for whit worth threads, he would want a inch screw pitch gage. You guys probably know that, just wanted to bring attention so you don't send China good money for something you can't use.

http://www.ebay.com/itm/Screw-thread...item258a78de37

One of the better investments you can make in the old vehicle world....

Cheers,

Sirhr

[wideglide38]

Thanks. Read up on thread angle. Whitworth threads are based on 55 deg. thread angle and U.S. on 60 degree. Ordered a Starrett No. 6 gauge.