Welcome back to Albany County Fasteners - Fasteners 101.
I'm Bob and today we're gonna talk about markings on heads.
I'm gonna teach you about the different markings and what they mean, but before we get started,
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So let's get started.
All right, I have a bunch of bolts here and I just wanted to go through the markings on these bolts
so you understand them when you read them.
Some of the markings on here will indicate that it's a grade 8, grade 5, grade 2, standard alloy, 316 stainless, or 18-8 stainless.
So I'm gonna show you a couple of heads.
First, I'm going to show you this piece of paper here which basically shows you the standard markings,
according to IFI requirements, and when you look at this you can see that
some bolt's heads have absolutely no markings, some have strikes on them,
and then some have like a number and a letter on it, like a b7.
I'm gonna just go through this right now and show you a few heads with the markings and what they mean.
Okay, so this here has no markings on it.
Only marking that it does have is a manufacturer's marking. So how do you tell the difference?
Typically, you'll see initials on there, this is an lb okay?
That's a manufacturer's marking, whereas, if you took this one here, which has no markings,
that would be a standard grade 2 bolt. Just for your information.
On this one we have three slashes and typically three slashes is going to be grade 5.
You see the JH there?
That's a manufacturer's marking. So you have two different types of marks here.
You have a manufacturer's mark to them.
So if someone questions this bolt, should it fail, the manufacturer knows right away when he looks at it if it's his bolt.
The three slashes that you see on this head, that indicates that it's a grade 5 bolt.
This is a great 8 bolt. Again you see JDF on that bolt on the top.
Those initials again are manufacturers marking to indicate that this is their bolt
and then you see 1, 2, 3, 4, 5, 6 slashes indicating it's a grade 8.
If it had no manufacturers marking, you would just see those six slashes and that would indicate to you that you have a grade eight bolt.
And the reason why you're looking for these?
So when you buy bolts, you want to make sure that you have the correct bolt for your application.
In cars, you don't want to use a grade two for certain applications such as,
suspension, tying in your front arms, it's not made for that.
You typically want to go for a grade 5 or a grade 8 depending on what the manufacturer recommends
and that's, you know, just talking about different applications.
This bolt here which is a hot dip galvanized alloy bolt.
It has, again, the manufacturers markings: the XYLX and then it says 307A.
307A is the indication of the strength of the bolt.
Basically, this is equal to like a carriage bolt strength, a grade 2 or better, a little bit better than a grade 2,
but standard alloy. These are not heat treated.
When you're dealing with grade 8, these are through-and-through heated bolts so they're treated for strength.
Grade 5 are partially treated. On to the next one, you can see a THE at the bottom.
This is a stainless bolt.
That's a manufacturer's mark and you will see here S30400.
That's 304 stainless steel. That's what that's telling me.
So when I read a stainless, stainless does not come with slashes.
They come with an actual marking of the level of stainless.
This one here you'll see the manufacturers marking ABF, I'm sorry, ABP and then you'll see S304.
The S stands for stainless and the 30400 is the marking for stainless steel and those markings
that you're seeing on these bolts are standard to IFI recommendations which
are standardized throughout the industry.
This one here, this is an S316, so this is a higher grade stainless steel.
You can see here that it says S-3-1-6-0-0 and at the bottom you see the manufacturers marking again THE.
That's the manufacturer that made the bolt and the last one: this is 316 stainless.
In this situation it also has another manufacturers marking on it: F-5-9-3-H.
You can see that there, then it has like a logo punched into the head.
That again, is a manufacturer's marking.
So there you go.
I just wanted to show you how to read these things so you understand them.
So when you're looking at them and a lot of you car guys want to grind these things off,
but before you grind them off know what you bought, so you understand what's
supposed to be in the box when you receive it.
Thanks for watching.
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