nuts and bolts

brian · Post by **brian** » Tue Mar 20, 2007 3:43 pm

I know this conversation's been had before, but I cant seem to find it.
so what is the deal with the SAE /whitworth thread thing.
every time I order a screw from a bolt and nut place it wont fit
my tap and die, but my tap and die fits everything on my 41 dodge.
what changed in the universe when I wasent looking?

tanks
BB

Tony B · Post by **Tony B** » Tue Mar 20, 2007 10:48 pm

Napoleon got the measurment of the worlds diameter wrong and we all got stuck with metric

Try getting a thread gauge and a couple of thread files, they really are a magic gadget for worn threads. The teeth are set to various thread gauges and you just file round it.

Phil P · Post by **Phil P** » Tue Mar 20, 2007 11:30 pm

Hi Brian.
Er I thought that Dodges were UNC and UNF threads not Whitworth. The nuts and bolts in mine are all unified, or were. The pan heads holding the floor plates are now M8 as the 5/16" threads were naff but tapped out to M8 as it ain't far away. If the thread is too damaged to retap to it's original size and it is somewhere were it is difficult to replace ie a captive nut than I have tapped them out to a metric size. Yes I know sorry but it is a simple cure. Why bang your head on the floor when there's a pillow handy. 3/16" will retap at M5 5/16" M8 and 3/8" M10. There isn't one for 1/2" as M12 is smaller and M14 is a 'non prefered' size. ie it ain't a common size, 5/8" is slightly smaller than M16 and not only that if it's 5/8" dia bolt it isn't there to hang your scarf on. So perhaps don't in case it pulls out. I thought in the US of A you had decided not to go metric. Going metric has probably cost the UK more by having to scrap machines and tooling plus all the measuring equipment than if it had stayed imperial. We only did it to comply with the rest of Europe who don't buy what we produce anyway. Oh yes high tensile metric bolts are marked 8.8 0n the head. It's about the same as condition 'T' in inch sizes.

brian · Post by **brian** » Wed Mar 21, 2007 1:33 am

on the current project I'm helping out with. the part that would need taped is in armor and theres like 84 holes,
I think ranger just hooked me up with nos though.
thanks
BB

Ray Edsall · Post by **Ray Edsall** » Wed Mar 21, 2007 5:56 am

Just my 2 bob,s worth .All UNC and whitworth bolts and nuts should fit each other except the 1/2 in unc and whitworth .They are i tpi out ..ie 1/2 inch whit 12 tpi and 1/2inch UNC 13 tpi difference .The only other difference is the angle of the thread I think from memory one is 60 deg and the other 55deg.. So you can use the UNC taps and dies for Whitworth and vise versa. { Except 1/2 inch} Hope this helps . Ray .

brian · Post by **brian** » Wed Mar 21, 2007 4:40 pm

scince theres nothing made in america anymore, I figure the chinees
must have the wrong tooling, there doesent seem to be one screw that fits anymore. standardization has gone out the window, and everyones pushing there own head style or drive style, along with there own tool
to do it with.
its anarchy i tells ya. just anarchy.

BB

Tony B · Post by **Tony B** » Thu Mar 22, 2007 8:29 am

As a last resort and the risk of having the mob outside with burning torches. Loctite make a very good liquid thread sealer that fills damaged threads. There are other products available, and of course the good old Helicoil.

rgus · Post by **rgus** » Thu Mar 22, 2007 1:34 pm

I have used McMaster Carr for years with nary a problem. Is it possible your vehicle is a European return that has been through a rebuild with metric stuff????????

brian · Post by **brian** » Fri Mar 23, 2007 7:41 pm

no, shermans been in vagas knocking down buildings its hole post war life,
its v-8 ford, with a peekaboo commanders coupla, the screws I'm talking about hold the window retention rings on the outside.
I think its e9 version.
tanks
BB

nuts and bolts

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