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123 blocks
doubleboost:
Unc &Whit are very similar but not the same (they are both crap)Compared to the metric equivilent :doh: :doh: :doh:
At least metric comes apart after a few years :D :D :D :D
The most commonly snapped tap must be 1/4 whit
Bogstandard:
The reason that I asked John, is that both UNC & BSW both have the same diameter and pitch (but different thread angles) and sometimes, at a push, can be used with each other as a 'get you home' fix (bodge it up). :dremel:
So I just asked which thread type it was, just to make sure that the correct information is given, so that people could buy the right ones, and not have to bodge the bolts in. :bang:
We will have to differ on the best threads (there has been massive debates on the subject), as sometimes, both the coarse threads of UNC & BSW can be used to great effect when trying to hold a thread in soft or weak materials, like ali, sometimes brass and bronze(depending on type), tufnol and magnesium etc, whereas metric will just strip out when tightening pressure is applied, as the threads are not strong enough. :smart:
BTW, if you buy the slightly more expensive versions of the 3-2-1 blocks (in a plastic blow moulded box), they are supplied with the correct sized cap screws, but they still won't go thru the blank holes. I know, I have bought both types. :thumbup:
John
PekkaNF:
--- Quote from: Bogstandard on June 17, 2011, 08:48:17 PM ---
--- Quote ---ONE 3/8-16 bolt
--- End quote ---
Is that UNC or BSW?
--- End quote ---
That was the question I got asked at the shop, but because my head is made out of swiss cheese I didn't write it down and I didn't put it here because I was not sure. I think I hear it was unified, I checked it home with a 60 dec. gauge but the problem is: I never gauged 55 dec. I just don't have experiend on how the difference is. Maybe I'll get adventurous and buy few bots of opposite inclination and compare these.
This bolt looked odd to me. Pretty much all inch based bolts I have seen lately have this american grade marking. This has 8.8 grade, same as metric.
It's an industrial shop next next chance is on Monday, then I'll make it doublesure and take the block and the screw at the shop and ask them.
I'll get back to this when I have facts.
Pekka
tomrux:
8.8 is the grade or strength of the bolt. all religions of bolt carry the same grade marking. it gives the yield point of of bolt nut combination
8.8 structural grade
10.6 high strength(high tensile) may also be denoted by three check marks on the head of a bolt. especially so on small bolts
4.4 is normal grade mild steel. normaly not marked.
Nuts are marked with three arcs on one face concentric with the thread if they are high strength otherwise assume normal mild steel
Tom
PekkaNF:
Oh, these 8.8 et al grade markings I'm familiar with. Somehow I related tangential lines (check marks?) purely to a american system. Seen them only on aviation and most of those seem to be imperial.
Pekka
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