R
Reggie3cl
Guest
Yes or no?
Simonr501
Hero member
- Location
- Lympne, Kent. UK
No!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
If they are serrated then they need to grip on something, if a washer is fitted then the underside of the washer will spin.
If they are serrated then they need to grip on something, if a washer is fitted then the underside of the washer will spin.
R
Reggie3cl
Guest
What if they ain't? Serrated, that is.
Simonr501
Hero member
- Location
- Lympne, Kent. UK
Reggie3cl said:
In that case a plain flange is doing the same job as a washer, it is there to distribute the load, so in my opinion the answer is the same - no.
R
Reggie3cl
Guest
Ta.
Dellortoman
Hero member
- Location
- Tasmania, Australia
If you have flanged nuts I'd recommend you see a doctor.
CLEMTOG
Hero member
if you use a plain flanged nut then you a a 50% less chance of slipage over a plain nut and plain washer, but the flange bit can do damage to a soft surface as it is rotated and tightened, so where the parent material is soft (eg alloy primary case) the plain steel washer and plain nut (or bolt) would be best, because at the point of correct torque the nut can still slip on its washer,providing a sort ogf "bearing" surface (steel on steel) but the washer will not rotate on the case (steel on alloy),they have their uses, eg they are realy good at fixing sheet metal to more sturdy frames such as angle iron, usefull for fixing plastic type things to harder material (wood/stone) or to like material and stuff that generally does not get removed and refitted as a routine.
CLEM
CLEM
jotajoe
Hero member
- Location
- Warwickshire UK
I see and agre with Clem's assessment completely.
Co-incidentally, I was talking to an engineer yesterday and for some reason washers came into the conversation.
There was a long story about how Ford would go to unimaginable lengths to save money even on a low cost item like a washer ( due to overall volume used ).
The point of the story was that if a bolted up assembly is subject to shear forces then a star washer is much much better at resisting movement than a plain washer which if it slips sideways can "guillotine " a bolt quite nicely.
joe
Co-incidentally, I was talking to an engineer yesterday and for some reason washers came into the conversation.
There was a long story about how Ford would go to unimaginable lengths to save money even on a low cost item like a washer ( due to overall volume used ).
The point of the story was that if a bolted up assembly is subject to shear forces then a star washer is much much better at resisting movement than a plain washer which if it slips sideways can "guillotine " a bolt quite nicely.
joe
Simonr501
Hero member
- Location
- Lympne, Kent. UK
Hmmmm, you are moving into strange territory there Joe.
Star washers in my experience are used for parts you don't want to come loose that are not torqued to blazes, or to provide a nice electrical path through a bolted joint due to the washer 'digging in', i.e. an earth path on pipework (pharmaceutical industry).
In theory a plain washer could act as a guillitine, but a flange or similar would be much better at slicing through a bolt.
Anyway, if a bolt is tight enough then the compressive force will resist the shear forces and the joint will not slide sideways in the first place.
Perhaps car companies don't do their bolts up tight enough? Or use monkey metal for fasteners?
Star washers in my experience are used for parts you don't want to come loose that are not torqued to blazes, or to provide a nice electrical path through a bolted joint due to the washer 'digging in', i.e. an earth path on pipework (pharmaceutical industry).
In theory a plain washer could act as a guillitine, but a flange or similar would be much better at slicing through a bolt.
Anyway, if a bolt is tight enough then the compressive force will resist the shear forces and the joint will not slide sideways in the first place.
Perhaps car companies don't do their bolts up tight enough? Or use monkey metal for fasteners?
CLEMTOG
Hero member
Ford did at one time specify the exact dimensions and spec of packing crates made to send bought in parts, because the crates later beacme the seat frames on the model T,they also (much later) arranged the body presses, to save the disc stamped out for the fuel fillerspout (Prefect 1955) to later get repressed as the fuel cap itself, just two things that I remember from lots, since I did a college project on "mass procuction of cars"
CLEM
CLEM