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Learned a new term today “Thread Detective”

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gahrajmahal

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Cincinnati, Ohio
The Mrs asked me if I could put a new caster on one of her nice cast aluminum pot roller stands. She can easily move the large pots around for cleaning and plant maintenance that way. The casters (still need one by the way) are threaded into the aluminum and have a stud, about an inch long. Looking online most of the replacements list metric threads. M8 I believe. Well, I don’t keep any metric fasteners as I hardly run across them unless I’m working on the daily drivers. Then I just buy what I need. So, I thought I’d buy one of those male/female thread “identifiers” I see in the hardware store. Those things are called “Thread Detectives” as I have now found out. A GJ search didn’t come up with any threads on the subject, so I thought I’d start one. I purchased this one from Grizzly, hoping they made them in the USA.

www.grizzly.com

Grizzly T32641 - 36 Pc. Inch & Metric Nut and Bolt Thread Gauges - Grizzly Industrial, Inc.

<h1>T32641 36-Piece Inch & Metric Nut and Bolt Thread Gauges</h1> <h2>Nut and bolt thread gauges are a must have for anyone who uses fasteners.</h2> <p>The T32641 is an accurate and easy-to-use thread identifier for both nuts and bolts.</p> <p>Each individual gauge features a male threaded stud...
www.grizzly.com www.grizzly.com

What do you use for thread identification?
 
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Leaflessshadetree

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Don't ask.
I have a few different tools. Everything from plastic card type to a micrometer and pitch gauges. I mostly use ones similar to what you have posted, especially for hard to see internal threads,
 
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eyeball

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Joined
Jul 14, 2011
Messages
407
gahrajmahal said:
The Mrs asked me if I could put a new caster on one of her nice cast aluminum pot roller stands. She can easily move the large pots around for cleaning and plant maintenance that way. The casters (still need one by the way) are threaded into the aluminum and have a stud, about an inch long. Looking online most of the replacements list metric threads. M8 I believe. Well, I don’t keep any metric fasteners as I hardly run across them unless I’m working on the daily drivers. Then I just buy what I need. So, I thought I’d buy one of those male/female thread “identifiers” I see in the hardware store. Those things are called “Thread Detectives” as I have now found out. A GJ search didn’t come up with any threads on the subject, so I thought I’d start one. I purchased this one from Grizzly, hoping they made them in the USA.

www.grizzly.com

Grizzly T32641 - 36 Pc. Inch & Metric Nut and Bolt Thread Gauges - Grizzly Industrial, Inc.

<h1>T32641 36-Piece Inch & Metric Nut and Bolt Thread Gauges</h1> <h2>Nut and bolt thread gauges are a must have for anyone who uses fasteners.</h2> <p>The T32641 is an accurate and easy-to-use thread identifier for both nuts and bolts.</p> <p>Each individual gauge features a male threaded stud...
www.grizzly.com www.grizzly.com

What do you use for thread identification?
Click to expand...

I have the thread detective set and have used it for years. I can easily eyeball SAE nuts, bolts and threaded holes. However, I have no idea when it comes to metric. I found the set much more versatile after I cut them off the cable.
 
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Blueshound_GJ

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Feb 21, 2022
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421
I have a plastic thingie with holes in that I got for free, or the tap & die brass thingie.

Most often I just bring one with me to True Value and match it up. I enjoy the hunt!
 
OP
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gahrajmahal

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Cincinnati, Ohio
cgrutt said:
Ugh, now I have to have one lol. I usually use a pitch gauge from one of my tap & die sets (SAE or metric). Nice find.
Click to expand...

This^^^ was my secret reason for making this thread! I wanted to get back at those posting similar “cool and useful “ threads for stuff I didn’t know I needed, then had to go out and buy myself!

I have pitch gauges and calipers plus one of those plastic card identifiers. I use them when teaching the chapter on “Threads” during my adult education Machine Trades Blueprint Reading class. I love to see the expression of blown minds when I explain that drill bits in America typically come in fraction, decimal, letter and number sizes! I usually throw in some handouts about Wentworth threads too, since why wouldn’t you.

None of that knowledge is helpful to this old man when he is standing there with an unknown threaded caster stud from a Chinese pot holder stand. But I’ll know soon enough when my THREAD DETECTOR arrives from Grizzly.

IMG_1024.jpeg
 
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joel63

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Oct 9, 2012
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Location
Central FL
gahrajmahal said:
This^^^ was my secret reason for making this thread! I wanted to get back at those posting similar “cool and useful “ threads for stuff I didn’t know I needed, then had to go out and buy myself!

I have pitch gauges and calipers plus one of those plastic card identifiers. I use them when teaching the chapter on “Threads” during my adult education Machine Trades Blueprint Reading class. I love to see the expression of blown minds when I explain that drill bits in America typically come in fraction, decimal, letter and number sizes! I usually throw in some handouts about Wentworth threads too, since why wouldn’t you.

None of that knowledge is helpful to this old man when he is standing there with an unknown threaded caster stud from a Chinese pot holder stand. But I’ll know soon enough when my THREAD DETECTOR arrives from Grizzly.

IMG_1024.jpeg
Click to expand...
You have a link to that textbook?
Thanks
 
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gahrajmahal

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Cincinnati, Ohio
joel63 said:
You have a link to that textbook?
Thanks
Click to expand...

Here you go from Amazon

Machine Trades Print Reading: Barsamian, Michael A., Gizelbach, Richard A.: 9781645646563: Amazon.com: Books

Machine Trades Print Reading [Barsamian, Michael A., Gizelbach, Richard A.] on Amazon.com. *FREE* shipping on qualifying offers. Machine Trades Print Reading
www.amazon.com

I’m using the seventh edition now, but if you like I’ll send you my old sixth edition gratis. It’s not much different in content. Blueprint reading hasn’t changed much since they came up with Geometric Feature Control, and both editions cover that the same. PM me and I’ll send it to you media mail.
 
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Fedwrench

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Valley of the sun
Never heard of a thread detective. I've had a pair of thread checkers hanging on the shelf unit by our bolt bins at work for years. They're extremely handy for those wandering souls that pass through the shop asking, you got one of these? :lol: :beer:
 
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KnurledNut

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toolmiser

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Sep 1, 2009
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La Crosse, WI
I have both metric and SAE and find them handy. A couple years ago I bought a few hardware drawers at a garage sale and spent time and organized my nuts and bolts. The other day I had a couple bolts and nuts that didn't fit my regular sizes so I checked and sure enough they were metric. I have very little metric so I keep that in one container.
 
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nadogail

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Jan 23, 2009
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Location
Coronado, CA
I use a combination of Experience, Known Samples, and Measuring Tools to Identify threads.
Having come of age in the USA my experience with the Whitworth system is non existent, I also have almost no knowledge of the British Standard Cycle threading standards>
I have a little understanding of how Metric threads are identified by diameter and pitch, but I don't think in metric.

The default measuring system used in my shop is Feet and inches.
 
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gahrajmahal

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Dec 12, 2008
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Cincinnati, Ohio
My new Thread Detectives arrived today so now I can order replacement casters for our plant caddy. The Grizzly TD is high quality and a good value in my opinion.

IMG_5445.jpegIMG_5446.jpegIMG_5447.jpeg


For now they will live in my fastener drawer . This is an IKEA kitchen drawer unit fastened under my shelving unit.(attached to the ceiling so it won’t tip over)
 
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ctandc72

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VA
Damn this thread. I have a set of those somewhere. Got them years ago when a small, local hardware store closed. The owner gave them to me with a bunch of other random stuff when I helped a friend move a bunch of shelves / cabinets for the guy. Now I'm going to end up spending time looking for them. Thanks for nothing.
 
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Toold_up

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This is another good one:

Fastener Black Book

The Fastener Black Book is a Pocket Sized Reference Guide for Engineers, Designers and Makers. It contains 248 Full colour, Tear Resistant Pages.
www.fastenerblackbook.com www.fastenerblackbook.com

Comes with thread identification gage:

Fastener Thread Pitch

A Thread Identification Gage is included in the Fastener Black Book. If you are trying to figure out Threads per inch or Standard Metric Thread Sizes, this gage is for you.
www.fastenerblackbook.com www.fastenerblackbook.com
 
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FMC1959

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Feb 9, 2014
Messages
2,306
Location
Montreal, Canada / Upstate NY
I got about 30 boxes (heavy) of nuts & bolts, many were cap screw heads, different sizes up to 3/4" diameter, from an auction. I was actually bidding on a Durham Rotabin (and won),


...all the nuts & bolts came with it. I needed a way to separate & store all of these and need help identifying thread pitch, SAE or Metric...etc.

I had the Lee Valley set, smaller set than the one linked above. Then I got some thread gauges. I also downloaded from one of the nuts and bolt places online; they had PDF's with thread pitch, screw head and types, and a bunch of other PDF's, which were useful.

Then I got the thread detective (or Thread Checker?), which I have them hanging from my toolbox. Since getting them, I rarely grab the other stuff.
 
M

mikey03

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May 17, 2024
Messages
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PBCampbell said:
Thread pitch gage, a sheet with screw/bolt sizes, and maybe a set of calipers take up a whole lot less space.
Click to expand...
I been using calipers but I just do metric so it’s easy. Would be a pain to do SAE this way because then I have to have a conversion table to know how many decimal inches is #6 and have to count how many threads over one inch. But maybe If I have a cheat sheet of diameter I could also cheat and list out distance between threads even if it’s not messured that way it should be able to be converted.

Metric is so easy though I just measure once around the bolt and then once between the threads. But idk if I ever tried to measure a nut this way now that I think about it. Prob need a thread pitch gauge to messure a nut.
 
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