Bolt help please

I need 4 bolts to bolt my engine stand to my engine, I thought i found the correct bolt size but it turns out i didnt.

I need the red circled bolt, just longer. when looked up its a 3/8 UNF x 1.3/8.
However I cannot readily find these anywhere in a longer format.

Does anyone have any info on these?
Otherwise i could maybe buy a set for the front bumper? Those are supposed to be the same thread no?

There’s prob other sources , I used 10mm x100 from screwfix but mine later 5mb with metric threads and they were too long but additional nuts were used

okay I was confused as to the 1.3/8 metric. But if 3/8 UNF is correct, then im helped!
Thanks!!

Just checking ,You know you don’t mount the engine to stand with the flywheel cover on , it’s directly to block

steve2286w said:

Just checking ,You know you don’t mount the engine to stand with the flywheel cover on , it’s directly to block

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Yes! i know, just those bolts didnt seem metric with the fine thread. So i needed to find the ones that fit. I though i had them but they were too big, so i got insecure xD

Good idea to get a set of thread pitch gauges , one for metric and one for unf /UNC and either 0-25 mic or vernier and a Zeus book to refer to

steve2286w said:

Good idea to get a set of thread pitch gauges , one for metric and one for unf /UNC and either 0-25 mic or vernier and a Zeus book to refer to

Zeus Precision Engineers metric Data book Chart pocket reference book new | eBay

Zeus Precision. Data charts and reference tables Engineers pocket booklet. Log Tables. Standard drill sizes and Decimal equivalents. Thread information. Jig boring Co-ordinates.

www.ebay.co.uk

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You mean a scaffold tube on a breaker bar is not the correct way of mixing different threads?

Buy longer bolts and cut em down... Just remember to put a nut on first so afterwards you can wind the nut off with a socket and it will fix any thread you damaged while cutting

codfather79 said:

You mean a scaffold tube on a breaker bar is not the correct way of mixing different threads?

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Best form of single use locktite!