What thread pitch to use

[TR3driver]

I guess some people have lower thresholds of "exact" :laugh:

 

[Andrew Mace]

Roger, I glanced through that link. One thing puzzles me: why does imagining 1 inch = 25.6 mm make conversion any easier than accepting the fact that 1 inch = 25.4 mm? I mean, doesn't just about every cell phone and computer have a calculator function built in? :laugh:

 

[Member 10617]

Just received two terrific thread gauges in the mail from the bolt Depot. One is US thread gauge, and the other is metric thread gauge. Plastic, well designed and made, well marked, and very inexpensive. They have helped me go through my odds and ends collection of bolts and sort them out by size, thickness, and threads per inch.

 

[DNK]

Plastic, how do they get the teeth small enough to do 32,36,and 40 TPI

 

[Andrew Mace]

Love your new Avatar, Don! Whose Herald did you steal that from?

 

[DNK]

Don't look in your garage Andy

 

[Andrew Mace]

Hmmm...the only Herald I own that would have that particular badge has been under a car cover since I bought it 15 months ago...and I've not peeked under there recently....Hmm....

 

[DNK]

Somebody posted a herald for sale a while ago and this was one of the pics
Want a copy??

 

[Andrew Mace]

Sure, why not?

 

[Member 10617]

Don,

The guage doesn't go that small. The US gauge has the following TIPs: 4 1/2, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 16, 18, 20, 24, 28.

 

[DNK]

Does it look similar to this?

 

[Member 10617]

Hi, Don,

No... the US and Metric gauges that I have resemble what you have but they have "saw teeth" for the threads up and down one side.

There are photos of the two gauges at:

https://www.boltdepot.com/Thread_gauges.aspx?nv=l


(that last figure is an el and not a 1.

 

[DNK]

What you need is this

 

[Member 10617]

Don,

You are right. But where can I find it?

 

[TR3driver]

Should be readily available from any place that carries threading tools. For example, MMC has a variety of them available, covering UN, Whitworth, Metric and even Acme threads.

 

[DNK]

Do you have a nut and bolt store?

 

[TR3driver]

Do you have a nut and bolt store?

Yeah, it takes up about 6' of wall space in my garage.

 

[Banjo]

You should be able to pick up one of those thread pitch gauges at Sears. they're in with the tap and dies. there will be 2 of them. one for SAE, one for metric.

 

[Member 10617]

This is a small town, so no nut and bolt stores. Even our Sears is a very small, mainly catalog store. I'll look on the internet for Sears.

Thanks.