I did a search and found this old advertisement in what looks like a 1950s era business magazine. I'm sure that would have gotten a lot of laughs in the "Mad Men" era. These days, it would send snowflakes running to HR.
Posted on 04/28/2018 8:43:57 PM PDT by SamAdams76
They are. All metric bolts have a number stamped on the head followed by a decimal point, and then a second number. The first number is the tensile strength in thousands of mega-Pascals. The number after the decimal point is the ratio between tensile and yield strength. You multiply the first number by the second to get the yield strength. (Don't confuse the size of the bolt with the strength. A 10 mm diameter metric bolt is generally called an M10 bold. This is NOT marked on the bolt. An M10 bolt can be any strength. A bolt marked 10.8 on the head can be any diameter.)
SAE bolts are a little less specific. There are generally three grades available: grade 2, grade 5, and grade 8. Grade 2, the weakest, has no markings. Grade 5 is moderate strength, and has three radial lines on the head. Grade 8 is the highest strength, and has 6 radial lines on the head. If you didn't notice, add 2 to the number of radial lines on the head to get the grade of the bolt.
ping
Fascinating story in an NHK World video with English voice over. Well worth your time to watch: in telling the story, the inventor gives an informal tutorial on how to think outside the box.
The Professionals in Japan Defying Convention -- Hiroshi Michiwaki (YouTube, 47 minutes long, however, high production and explanatory values)
Another product absorbs noise on a highway by using a series of carefully calculated angles to reflect sound. His extraordinary flow of ideas addresses a wide variety of challenges.
The roots of his inspiration lie in a decision to leave school at age 11 before working a series of different jobs. As we follow him at work, we gain insights into the thought processes of a genius with almost no formal schooling.
Hex bolts are labeled for tensile strength
Good post. I walked into a hardware store some years back, and started working the next day. I had to learn on the job what all this meant. And, it wasn’t a very good hardware store, very disorganized. I did inventory once. Bolts and nuts mismatched everywhere, but once I got a handle on what a customer was looking for, I could match things up for them.
There are a LOT of options.
Very interesting.
Anyone notice that in all those years, nuts and bolts stick to specific genders?
As one who gains inspiration from history and science fiction, this was a great read. Thanks!
seems like some gender confusion going on with nuts as intrinsically being female components yet demanding to be called nuts. And why are they called washers, isn't that demeaning to feminists?
;>)
I once met a nuts and bolts salesman. He rally knew his business.
He drew markings on paper showing what they meant on the head of a bolt. Now that we have the internet I guess it is easy to just look it up.
He said the most common problem people have is replacing the bolt holding the blade of a lawn mower with a mild steel one. Guaranteed to break.
I did a search and found this old advertisement in what looks like a 1950s era business magazine. I'm sure that would have gotten a lot of laughs in the "Mad Men" era. These days, it would send snowflakes running to HR.
There are many specialized threaded fasteners in automotive and many other industries.
Another automotive example are head bolts; the torque specs you get from the manual usually won't tell you that the spec is for "new" head bolts. The new head bolts get stretched just so much to keep the head gasket from leaking, the old head bolts cannot achieve that optimum strength a second time.
On a related note, Boeing is set to announce Monday that they have agreed to buy
KLXI a large manufacturer of bolts and other connecting hardware.
Was up 9% Friday.
I worked in aerospace for awhile. On the factory floor, if a tech pulled a nut or bolt out of the bins and it was the wrong one, they were not allowed to put it back. It got thrown into a bucket on the floor. This was NAS hardware. Every month there would be a salvage yard sale for the employees. I would buy the entire contents of these buckets for a few cents/pound. Beautiful stuff, some of it even silver plated. All fine thread though, so often not usable on my car. Sorted it, stored it, use it.
We had to purchase tension testing machines to confirm the hydrogen was properly baked out and met spec.
When I was around 15 years old my father bought a new calkins rod weeder that came to the local dealer unassembled. Like my father using young family to work the farm the dealer had his sons doing the prep work. In their inexperience they used a lower grade bolt on the main frame pivot points. I was running at night to help get our work done. We were in the transition between older 820 John Deere tractors to a 145 Versatile 4WD so hadn’t really gotten a handle on the pulling power. There I was in the dark (old style lighting) and the motor was bogging down. My experience said to down shift and go which I did, twice. Needless to say the rod had gone deep into the soil and when I saw the bent steel I just walked home. In the aftermath I was glad I did not have to go help the dealers sons dig it out and replace all the bent tubing and fit the proper bolts. Grades mean things!
ping for later
A Clintonite escapes the asylum, commits rape and runs wild in New York.
Stated in four words.
Nut, screws, and bolts.
LOL!
Bolting out of here ~~~~
Now to find a proper metric wrench to tighten up;
and why to they refer to them as wrenches?
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