conversion metric bolt to whitworth bolt

[91873634542]

Hi All,

our exsisting line using bolt M64X6 Gr8.8, what the suitable bolt size if we want replace it to withworth (inch) bolt ?
please advise for bolt size and bolt material

regards

 

[miningman]

Changing to an inches based thread is one thing, but` are you really sure you want to go Whitworth?? I dont think Ive seen Whitworth used since the British Motorcyle industry started to go down hill in about 1958

 

[KENAT]

I'll back up with miningman says, do you really want Whitworth or do you mean Unified thread form?

Posting guidelines faq731-376

http://eng-tips.com/market.cfm?

(probably not aimed specifically at you)
What is Engineering anyway: faq1088-1484​

 

[racookpe1978]

As above, why did you name Whitworth?

What ever you change it to, change both the bolt/stud AND the nut.

Use a larger bolt and nut, don't ever "translate" into a smaller size. Since your flange and vessel are already built, you will need to measure the holes for the maximum new/replacement bolt/stud dia.

 

[Duwe6]

An 8.8 is similar to a USA [SAE J429] grade 5. For flange bolting, I would upgrade to SA-193 Gr. B7 studs and 2H nuts. This is the standard bolting for pressure piping in North America / ASME items.

M64 is about 2½-inches. I would purchase 2½-UN8 studs. 2½-inch nominal OD, 8 threads per inch. Standard stuff for USA.