Racetech RD107 Bolt - Exhaust Manifold
Discussion
These ones
I'm not old enough to figure out imperial without googling and I'm not entirely certain what all of these measurements are so I might as well just ask here, I normally walk in somewhere with the bolt I want and ask for a few of them
What size head has this bolt got in mm please?
3/8x1x16 UNC
I'm not old enough to figure out imperial without googling and I'm not entirely certain what all of these measurements are so I might as well just ask here, I normally walk in somewhere with the bolt I want and ask for a few of them
What size head has this bolt got in mm please?
3/8x1x16 UNC
Yeah, I've got a box full of 14mm head ones but I thought I heard that the originals were smaller. What does the 3/8 bit in that refer to then, I guess it's not the head size?
Anyone got any thoughts on fitting a set of 13mm ones to give more of a turn with a spanner on some and maybe be able to get a ring on the really close ones, would I be more likely to round a head or something if they were smaller?
Anyone got any thoughts on fitting a set of 13mm ones to give more of a turn with a spanner on some and maybe be able to get a ring on the really close ones, would I be more likely to round a head or something if they were smaller?
The 3/8" refers to the diameter of the bolt shaft before the thread is turned into it, as in metric bolt sizes i.e an M8 (8mm) bolt will typically have a 13mm head. other numbers refer to thread pitch (coarseness) and length. I'm no expert but this is what I understand. Hope this helps.
If you're replacing I would go for these
http://www.actproducts.co.uk/shop/ms17b-arp-bolts-...
Not only do they not come undone on their own, ( although 1 or 2 people have reported them coming loose) they have a smaller head size (3/8 IIRC)and are therefore easier to get a spanner on
http://www.actproducts.co.uk/shop/ms17b-arp-bolts-...
Not only do they not come undone on their own, ( although 1 or 2 people have reported them coming loose) they have a smaller head size (3/8 IIRC)and are therefore easier to get a spanner on
people usually refer to AF as 'imperial', but think UNC, AF and UNF will all be turned with an 'imperial' socket set, as the inch that we use and the yanks use is the same thing. As someone alluded to, the metric sockets are not equivalent and slop on the socket gripping the nut will cause the nut to round off.
However, there are socket sets that grip on the flats that claim to turn either metric or 'imperial' bolts.
The other thing is whitworth - i've got those as i've got an old bike and had an old landy - they don't fit anything else
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However, there are socket sets that grip on the flats that claim to turn either metric or 'imperial' bolts.
The other thing is whitworth - i've got those as i've got an old bike and had an old landy - they don't fit anything else
.spend said:
WTF is imperial then?
Most will class all threads based on the imperial unit (an inch) whether British / American / Japanese... IME.
OP typically spanner size for plain hex 3/8UNC is 9/16" AF.
Imperial is British, ie BSW ( British Standard Whitworth), BSF (British Standard Fine), BA (British Association), BSP (Brithsh Standard Pipe) etc...Most will class all threads based on the imperial unit (an inch) whether British / American / Japanese... IME.
OP typically spanner size for plain hex 3/8UNC is 9/16" AF.
UNF and UNC are American.
As the Rover block is of American origin it has UNF and UNC.
AV8 said:
spend said:
WTF is imperial then?
Most will class all threads based on the imperial unit (an inch) whether British / American / Japanese... IME.
OP typically spanner size for plain hex 3/8UNC is 9/16" AF.
Imperial is British, ie BSW ( British Standard Whitworth), BSF (British Standard Fine), BA (British Association), BSP (Brithsh Standard Pipe) etc...Most will class all threads based on the imperial unit (an inch) whether British / American / Japanese... IME.
OP typically spanner size for plain hex 3/8UNC is 9/16" AF.
UNF and UNC are American.
As the Rover block is of American origin it has UNF and UNC.
spend said:
You sound like a frog... they also like making up their own standards
Your right, they did make up their own. Theirs is called Metric. Me, I'm not a frog, but about 20 years ago I served a 4 year apprenticeship in mechanical engineering, then went back to college and did a 3 year degree course.
Industrial plant and machinery in those days was a mixture of Metric, imperial, American and whatever else you might just come across.
AF = Across Flats.
AV8 is correct, UNC and UNF are ASME standards (American Society of Mechanical Engineers).
When we sell steam turbines to the USA we have to use ASME threads on everything including the lifting eye bolts (guarantee that someone would manage to get a AMSE thread lifting bolt into a metric hole only to drop 40 tonnes of turbine casing on someone as the thread strips out...
)
AV8 is correct, UNC and UNF are ASME standards (American Society of Mechanical Engineers).
When we sell steam turbines to the USA we have to use ASME threads on everything including the lifting eye bolts (guarantee that someone would manage to get a AMSE thread lifting bolt into a metric hole only to drop 40 tonnes of turbine casing on someone as the thread strips out...
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