- Thread starter Gritineye
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MetalMonkey
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7/16 UNF Grade 8
https://www.spaldingfasteners.co.uk/PARENT2741
7/16 UNC Grade 8
https://www.spaldingfasteners.co.uk/PARENT2940
They do all other sizes.
Or you can try accu. https://www.accu.co.uk/
Or bolt world
https://boltworld.co.uk/product-cat...colour/7-16-20-unf-hexagon-bolts-self-colour/
https://www.spaldingfasteners.co.uk/PARENT2741
7/16 UNC Grade 8
https://www.spaldingfasteners.co.uk/PARENT2940
They do all other sizes.
Or you can try accu. https://www.accu.co.uk/
Or bolt world
https://boltworld.co.uk/product-cat...colour/7-16-20-unf-hexagon-bolts-self-colour/
Gritineye
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Thanks, maybe I'm using the wrong search terms, but Spalding appear to only stock grade 8 set bolts, I need partially threaded.
accu don't appear to stock what I want.
Boltworld don't appear to stock grade 8 in any form.
Gritineye
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Thanks, but as far as I know seat belt fasteners are usually grade 5, as grade 8 would be too brittle and could fail under bending shock loads.
MetalMonkey
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Grade 8 part threaded UNF
https://www.spaldingfasteners.co.uk/PARENT3058
Grade 8 part threaded UNC
https://www.spaldingfasteners.co.uk/PARENT4877
Accu will either stock it or make it to spec, providing you have the pockets deep enough - but you are best of talking to them.
Gritineye
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Yes I really do mean grade 8 imperial bolts, the ones with a circular depression and 6radial marks on the head.
Equivalent to metric 10.9.
Erie Fred
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No circular depression though:
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timgunn1962
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Can you use socket head cap screws? They tend to come in the higher-tensile materials: usually 12.9 in metric.
So you do know what you want
You can't beat having a conversation with a supplier, but even so, Spalding do seem to sell what you want:
7/16" UNF Grade 8 Yellow Zinc Part Threaded Hex Bolts
7/16" UNF Grade 8 Yellow Zinc Part Threaded Hex Bolts
www.spaldingfasteners.co.uk
7/16" UNC GRADE 8 / 10.9 HEX HEAD PART THREADED BOLTS YELLOW ZINC PLATED
7/16" UNC GRADE 8 / 10.9 HEX HEAD PART THREADED BOLTS YELLOW ZINC PLATED
www.spaldingfasteners.co.uk
Although admittedly, not in the length you want - time for a phone call?
Gritineye
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Thanks very much appreciated help chaps, sometimes just I can't see the wood for the trees!
@bricol I spoke to Spalding, they don't stock the size of UNF grade 8 bolts I need (7/16 UNF x 1.25 with a 7/16 length of unthreaded shank) so I ordered 1-3/4" ones and will just have to tap the thread down a bit, not ideal as a rolled thread is better, especially holding a 35 pound flywheel with added clutch on, but needs must.
They also don't stock the length of UNC grade 8 bolts I need for another job but I ordered some as the unthreaded bit isn't so critical and I can just cut them down to length.
@bricol I spoke to Spalding, they don't stock the size of UNF grade 8 bolts I need (7/16 UNF x 1.25 with a 7/16 length of unthreaded shank) so I ordered 1-3/4" ones and will just have to tap the thread down a bit, not ideal as a rolled thread is better, especially holding a 35 pound flywheel with added clutch on, but needs must.
They also don't stock the length of UNC grade 8 bolts I need for another job but I ordered some as the unthreaded bit isn't so critical and I can just cut them down to length.
Agroshield
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Could you please say why this is a requirement.
If there were a choice of a fully-threaded item and a part-threaded item with a home-cut extension to the thread, which is going to be the better-engineered solution?
Gritineye
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Because that's what's specified by the engine manufacturer, I agree it's a compromise, but I may be able to get around it by adding a thick spring washer.
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Seadog
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Don't bolts and set screws have rolled threads, rather than die-cut.
I just had a rummage in my old company standards - 1-1/4 UNF wasn't listed as generally available as a bolt.
I'd be checking where the non-threaded part ends up, just in case I could simply cut the end of the bolt to make it the right overall length.
At those lengths, the threaded part ought to measure 2 x D + 1/4"
