Actual Bolt Size

Inches and metrics dont mix very well, do they?

I'd say it depends on the nuts but then 7/8" inch is 22.25 mm.

Did you look up the correct reference?

If in doubt measure the beasts and report back what you find!

22.225; maybe his problem is the same as yours.

A suitable nut can serve as a go/no-go gauge.
A set of thread pitch gauges could also help.

So you say he is a typo?

Whatever!

Whilst your chart covers UNC and UNF, it could also be UNEF at 20 TPI.

Dependent on where the OP is located, maybe it's a BSW thread which, whilst identical to UNC at 9 TPI and will fit, it has a different thread profile at 55° as compared to UNC at 60°, which results in a slightly smaller minor diameter for the UNC bolt and a tad of binding on the threads due to angle and/or depth differences

It could also be BSF at 11 TPI.

A lot of possibles, but an M22 stud in either course (about 10TPI) or any of the fine threads is not going to fit an existing non metric thread.

<re-subscribe>

The befuddled OP has never mentioned anything but the major diameter of the alleged stud.

As I said in my last (I thought) post.

Screw thread - Wikipedia, the free encyclopedia

"As per ASME B16.5 that 7/8" stud bolt size equal to M24"

Above mentioned sentence is your statement. Can you produce a copy of that praticular clause here.

I am aslo under pressure due to a pump calculation.So, I have no time to read ASME B16.5

By the way I am not OP

How would we possibly know?

they look like cousins.

If you had just called your pump supplier, like you were told 2 days ago, you'd have time to read it.

Do your own work. Then you will know how to answer questions about the inevitable failure of your projects.

"I got the information from an unknown stranger on an anonymous forum" will be a pretty sorry excuse.

Sounds like someone I could help find new employment with if they worked for me. How bout it Lyn!

You did not get what you ordered! Send it back and tell them again what you want!

A 7/8" bolt is about the same size as a 22mm bolt. With out markings on the stud. Best way to tell if it metric or imperial is thread pitch.

A 7/8" bolt or diameter converts to 22.20812182741117 mm. However the bolt material is as important that the actual diameter.

• What do the prints specify?
• Have you spoken to the engineer in charge of the project.
• A metric bolt and an SAE bolt are quite different. Typically the metric bolt has a finer thread.

So, how to check actual dimensional size for 7/8" bolts?

Try one of these:

It measures and displays in SAE and Metric

Where did you get that conversion, especially the spurious precision?

Here:

When working under an inch of diameter I use this quick calculation.

7/8" = .875

1mm = .03937007 so I round to .0394

.875 * .0394 = 22.20812182741117

I copied and pasted the number from the calculator OK, I'm tired this morning. JEEZ!!

Those two inexact choices explain the results. One inch = 25.4 mm. For binary fractions of inches, this gives decimals that soon terminate.

Splitting hairs!

So, being .0007" off is going to make the bolt fail? I guarantee you the 7/8" bolt during manufacturing has a tolerance much greater than that!

Yes, 25.4 mm = 1 inch

Give me a break, I'm tired and recovering from anesthesia. I had my finger operated on last night.

See how tired I am. This is what I had typed first - Yes, 1 mm = 25.4 inches.

Give Tornado a break. He is just pointing out the inconsistencies in our posts, chucking OT to all posts that have them. Why did you even make the same mistake of posting a number that is wrong? My typo and your rounding is just too much to confuse the hell out of OP who probably still does not know what has been delivered and if his ASME code is a proper version or a make shift copy from a dubious source.

(note to myself but I already knew this 1" is 25.4 mm)

Where did you get that precision? How did 3 significant (or 4 if you consider that 7/8" = .8750000) grow to 16 or so?

unit conversion from MM to Standard 25.4 * .875 = metric

This is a useless exercise.

The OP has no clue what they have.

So far no mention of tolerance, fit, class, mating fastener, thread pitch, the list is too long to bother.

OP, does it serve the intended purpose?

I'm done wasting time here. <unsubscribe>

These are not the same bolts, now unless your standard such as the one you listed where the units can be substituted. Your substitute had to meet those requirements.

And it doesn't no matter how you check the dimensions.

Get the correct size bolt.

Yes very true the original poster needs to step up and answer some questions or ask someone else. Return the bolts they sent you. Get the ones they should've sent you. I'm done.

My apologies to the forum. Once I woke up and realized that the original poster said studs and not bolts. So if they are studs then they are going to fit into a threaded portion on the mating surface which are metric I assume because the OP is concerned that the studs are not metric. Any way there needs to be more information fr the OP so it seems they are gone and so am I.

If it's a studbolt going into a hole threaded 7/8", M22 is not going to work, but he might have nuts on each end. In that case it's highly unlikely M22 would not be OK in place of 7/8". Incidentally M22 is a non-preferred size, but M24 might be a bit tight depending on the clearance hole for the 7/8".

Two questions;

1. how do you know you want 7/8" bolt?

2. How do you know you got 22mm bolt delivered?

Jim