Great vid. One comment. The stainless bolts are not delineated by higher or lower grades. Each stainless alloy is typically designed to do a specific job in preventing corrosion. 304 is a basic 18/8 alloy that has a broad range of uses and is reasonably priced. 304 is also typically used in you house, kitchen sink, knives, forks etc. 316 has a small amount of molybdenum in it. Typically used in the food industry as it has excellent resistance to the acids found there. When using stainless bolts it is wise to understand strength of the specific alloys as their properties differ vastly from carbon steel bolts. The L appended to the end of the grade (IE: 304L) means that the alloy is low carbon and meets that specification. Happy days

IFI = Industrial Fasteners Institute. Just like any industry association their purpose is not to make it easy to decipher their markings. Hence "no marking = grade 2, 3 lines = grade 5, 6 lines = grade 8. Common sense does not apply when dealing with standards organizations.

Thank you for getting right to the point.

I just learned that you add 2 to the number of slashes on a bolt head to get the grade. 3 slashes add 2 and you have a 5 grade. Pretty cool. Always add 2 to the number of slashes for actual grade.

I have a specification on bolts saying: 'STUD BOLTS C/W 2 A4-70, ISO 3506-2, SF, HH...etc...'. May I ask what does 'SF' and 'HH' stand for?

speed x 1.25. you're welcome

Could some explain what f and 7 lines on a 5/16 unc bolt mean? Does it mean is stronger than a 6 line grade 8 bolt?

My stainless steel hex bolt has no dashes. Its has F593C JBK THE on the head. What grade is this bolt? Grade 2 since it has no dashes or something else? Thanks.

The Letter Codes on Bolts at Big Box stores from Bulk displays are Speed Codes for the Cashier to be able to identify them at the register

Is cool, how about metric bolts? And Astm?

I have a bolt with 12 radial marks and an F in the centre. Where does this go on the ranking?

Thanks for clearing this up for me, its something I've wanted to know since adolescence but too lazy too look up. So I guess, when in doubt, get a bolt with as many slashes as possible!

You don't mention metric bolts at all, which have a numerical system for identifying grades. Even in the US, most cars now are built using metric fasteners.

Very useful info

I have metric bolts with 4 lines that secure my bottom motor mount, and I can't find any information on them.

How about "7T DS" where the 7T is abve the DS. Closest I coe is JIS, but appears non-metric 5/8-18? Very Confusig (on a tractor wheel stud)

Could you help me explain about symbol M, 8.8, and MICon cap bolt of china product?

I have purchased Bolts marked "Fed-Alloy" With 12 markings. They were sold to me by Acklands-Grainger Industrial supply on sale. Are they the strongest bolts available?

How would you know what hardness a stainless steel bolt is?

I have a bolt with big letter H on Head, what does it mean? Thanks

Hi, I am new in the fastener sales journey and I'd politely ask for advice to where start Selling Stainless Steel Fasteners :)

This is absolutely fascinating lol

What is the difference between an A2 and A4 bolt? I replaced a bolt marked SRS 8.8 with one marked XXYX A2 S304. I was told to find one marked A4, but A2 was all I could fine. This is going to see a lot of road salt in the winters. The bolt is used to keep a DEF injector mounted to a diesel exhaust system. I figured any stainless bolt would be better than a carbide steel bolt, which I think was originally in there.

GOOD VIDEO. TY

I just purchased a standard GR 5 hex cap bolt from Fastenal and the mfg marking is FNL. Except for the FNL and the 3 strike marking, the head also has "HT". I checked the SAE J429 and did not see anything mentioned about such marking. Could it be "JH" as "FNL" is a sub-company of "JH"?

Can you tell what the equivalent grade strength of a stainless steel bolt is by reading the markings on the head of the bolt?

Thanks for answer on stainless bolts. I was just trying t figure where in automotive use I could use them. What are grade 2 bolts in comparison to tensile strength. Thanks

What is the acronym or the name company of JDF? Thanks

What does a 4.8 marking mean?

Thanks

Great video. Thank you.

Any way to buy a bolt knowing the girth of the threads, & the length of the bolt?

All my garden tools are 304s

Don’t you mean hex head cap screw?

Thank You!

What do that markings (F593G316 THE) mean?

Thank you sir

I dont think anyone ever pay attention to bolt manufacturing. Just need to know how to tell what type of grade it is, what each different bolt colors mean and what each bolts purpose are made for.

Just curious, is there a reason they complicate bolt markings? 3=5, 6=8. What’s the philosophy behind this, instead of just saying 3 is not as strong as a 6? Normally there’s a reason behind it, so just curious. Funny how bolts go up in numbers when stronger, but in electrical wiring the thicker the wire the lower the number. Sorry to be a pain in the ass, one of those questions that always makes me scratch my head.

This would have been a better presentation if you had mentioned typical applications for each type of bolt.

nice to know, I have a bolt with "h110" on it? what does the "h110 stand for?

Can I use a stronger bolt for a head gasket on a car

I came here hoping to find out the differences between the types of bolts, but all the information I got was how to convert slash marks into a number, but no actual useful information such as the strength differences

i really like bolts us torque specs

Great video! Thanks!

You don't seem to be telling us what the different grades mean, say what 6 lines and a P would mean,I just took it from the auger on my snowblower, I am thinking this is not a shear bolt, there is no groove in the bolt, help

Hello bob, the head markings expert haha

As a european, used to the metric bolt markings, this seems so hard to grasp. 3 slashes grade 5, 6 slashes grade 8? Why not 5 slashes grade 5 and 8 slashes grade 8? The stainless marking however, makes sense i guess ^_^ Either way, good video, and now, should i ever happen to be in the USA, i would know my way around bolts! :D

Manifacture?

The logo on the last Bolt is for Viraj Profiles out of India

I see E11 CS a lot on the bolts I work with....no lines...just those characters...

Hi, can i ask what difference between FKE and VIBO?

Nice

Thanks😎

Are these international marking or just American please?

I have alot that have 8.8 on them is that grade 8.8?

Quarter 20 cap?

Said a lot but learned just a little..... I knew this info coming in, thought there’s more to learn.

It would have helped if you explained the various grades by number or maybe you are not familiar with them. Just sayin!!!

bolts united star number one

Thank Q

its 3am in the morning and I am learning about bolts.....I work in software smh lol

Nicely manicured hands of the presenter.

For six and a half minute video you gave almost zero information. it would have been nice to let everyone know what the strength of the bolts are what they could be used for, weather the automotive or if it's corrosive or non corrosive.

First thing first. What is IFI

👍🏻👍🏻👍🏻👍🏻👍🏻👍🏻👍🏻👍🏻

Standard engineers “let us make something to make there life harder” ok let’s make unreadable marking on bolts heads

Mannnafature mahhkings

Ehhh forget about it....

That product manufactur from.china

3 slashes grade 5 6 slashes grade 8 yeah american measurement systems xD

only american bolts here..

The guy has very high blood pressure and partially blocked neck arteries. This should explain his zero knowledge of metric markings, which I really needed to know. So stop eating junk and make video about metric bolts.

There's no logic to that! 3 marks should be grade 3 and 5 should be 5 and so on