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Thread Pitches


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  #1  
Old 11-15-2018, 08:50:29 AM
G Willikers G Willikers is online now
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Default Thread Pitches

This might be something worth talking about in this new forum. Does anyone have expertise in the area of thread pitches?
All I know is that I have different lots of old square nuts and bolts because there were different thread pitches used over the years.
Some companies seemed to use their own pitches.
British threads were different.
Then of course, there is metric!
Any thoughts?
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Old 11-15-2018, 09:34:29 AM
Bill Hazzard Bill Hazzard is offline
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Default Re: Thread Pitches

William Sellers standardized the screw threads here in the US in the late 1860's and 70's and except for the change of 1/2-12 to 1/2-13 it has not changed. Whitworth standardized the UK in the 1840's ans 50's.
There is a lot of info here. https://en.wikipedia.org/wiki/Screw_thread
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Old 11-15-2018, 09:44:05 AM
uglyblue66 uglyblue66 is offline
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Default Re: Thread Pitches

I aint real smart on this subject for sure.But my dad was on a crew that built the large power line towers and the bolts were galvanized.The threads were slightly different as the nut had to screw over the coating or something.Maby someone else can understand what I mean but I know those nuts won't work on a standard bolt and a standard nut won't thread right on the galvanized bolt.
And on the Model T Ford,there is 4 bolts, 1/4 in size that hold the bendix cover on the transmission hog head. Those bolts have a unique thread and if you loose them you have to get some thru the suppliers. Henry had a squabble with the company making bolts .
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Old 11-15-2018, 12:00:38 PM
Doug Wilson Doug Wilson is offline
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Default Re: Thread Pitches

you can purchase thread pitch gauges at any good supply houses.
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Old 11-15-2018, 02:01:53 PM
David Hoover David Hoover is offline
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Default Re: Thread Pitches

Good question, prior to WW1 a 12 tpi, 60 degree thread was pretty popular, Sawyer Massey and a lot of the Ontario steam company’s used it. Along with a lot of nuts fitted to bolts makes for fun reassembly some times. Standardized threads were a deffinate improvement! Didn’t George White buy a screw company at one point?
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Old 11-15-2018, 02:19:50 PM
Pat Barrett Pat Barrett is online now
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Default Re: Thread Pitches

Ugly blue, The 1/4" funny thread pitch you mentioned was probably 1/4-24. It was common after the turn of the century. Harley and Indian also used it.
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Old 11-15-2018, 07:37:40 PM
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OTTO-Sawyer OTTO-Sawyer is offline
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Photo Re: Thread Pitches

Not what G's looking for, but even today there are a Lot of Oddball Threads being used.

Like this 3/8-32 for example.

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Old 11-15-2018, 07:40:50 PM
David Hoover David Hoover is offline
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Default Re: Thread Pitches

Here’s a good breakdown of the screws development. I think one of the biggest variables would have been the people making them. Accurate and consistent measuring tools along with the people to properly use them would determine the consistency of a good product. I found when working on the early Sawyer gas tractors that if you had 3 nuts and three bolts you better keep them paired together, because there wasn’t two the same. https://www.nord-lock.com/insights/k...y-of-the-bolt/
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Old 11-15-2018, 08:13:53 PM
Pat Barrett Pat Barrett is online now
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Default Re: Thread Pitches

David, back in the 70's I helped a friend, here in town who some how had gone to Lousiania and leased a narrow gauge steam Locomotive to restore. Her name was Stephanie and she was a 36" Gauge Dickson. Some of the drive arm bolts were missing, so we took a good one out and had it duplicated, Wouldn't fit. They made a hole, then made a bolt to fit the hole, nothing standard.
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Old 11-15-2018, 08:37:42 PM
Bill Hazzard Bill Hazzard is offline
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Default Re: Thread Pitches

Here is a list of modern standard sizes. https://smithy.com/machining-reference/drilling/page/23
I had a more complete list of every screw size used by manufacturers for commercial products but the link is bad now and I can't find the list anymore.
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