Subframe bolts seized!
05-13-2010, 03:31 PM
#22
Registered User
Bolts are ALWAYS referred to by their thread size.
An M8 (8mm) bolt (actually hex-head cap screw) will have a 13mm head if it's DIN (US and European standard) and a 12mm head if it's JIS (Asian). Same bolt, same threads, perfectly interchangeable, different hex head size.
I'm not an engineer, but I never stayed at a Holiday Inn Express, but everyone know this.
An M8 (8mm) bolt (actually hex-head cap screw) will have a 13mm head if it's DIN (US and European standard) and a 12mm head if it's JIS (Asian). Same bolt, same threads, perfectly interchangeable, different hex head size.
I'm not an engineer, but I never stayed at a Holiday Inn Express, but everyone know this.
05-13-2010, 04:29 PM
#23
Moderator
It has become mechanics slang to call a 6mm bolt (thread size) a 10mm (wrench size), because a 10mm head on a 6mm bolt is extremely common.
This holds true for many bolts....
This holds true for many bolts....
05-13-2010, 04:31 PM
#24
Moderator
Originally Posted by Gigdy,May 13 2010, 09:41 AM
Hey look 4 17mm bolts on the subframe and 2 19mm.
Bolt heads:
2 rear, 17 mm
2 middle, 19mm
2 front, 19mm
05-14-2010, 09:49 AM
#26
Registered User
Originally Posted by Billman250,May 13 2010, 07:29 PM
It has become mechanics slang to call a 6mm bolt (thread size) a 10mm (wrench size), because a 10mm head on a 6mm bolt is extremely common.
This holds true for many bolts....
This holds true for many bolts....
For those who have never heard a bolt referred to by its thread diameter, go to any auto parts store (Advance, Pep Boys, Auto Zone, etc.) and look at the bolts. Especially look at the SAE bolts, where the size will be 1/4", for example. Look at the metric M6, M8, etc.
For that matter, go to a Sears Paint and Hardware or Lowe's where they have drawers full of fasteners and notice how the sizes are labeled.
So it is a "10 mm bolt" when I'm putting my wrench on it, but when I'm trying to buy one it's an M6 (6mm) bolt.
05-14-2010, 11:36 AM
#27
well i learned something new today. didnt realize thats the proper way to reference a bolt was by its shaft diameter. when i thought it was a 14 i was referring to the head size.
good to know.
i think i see why backyard mechanics call them by head size though, its cuase thats the damn socket to take it off!
good to know.
i think i see why backyard mechanics call them by head size though, its cuase thats the damn socket to take it off!
05-14-2010, 12:24 PM
#28
Registered User
Actually, the proper way to reference a bolt size is the way that the person you're talking to understands.
So in some contexts, those of us who tend to use thread diameter are wrong, if the other person doesn't understand what we mean.
When discussing removal, I try to specify "10 mm hex head" or "5 mm Allen head". Because most people will understand what that means. Backyard mechanic or professional technician they will know what size wrench they have in their hands.
When purchasing replacement bolts, I'd ask for an M6 hex head or socket head. Because that's the way the parts people will understand it.
So in some contexts, those of us who tend to use thread diameter are wrong, if the other person doesn't understand what we mean.
When discussing removal, I try to specify "10 mm hex head" or "5 mm Allen head". Because most people will understand what that means. Backyard mechanic or professional technician they will know what size wrench they have in their hands.
When purchasing replacement bolts, I'd ask for an M6 hex head or socket head. Because that's the way the parts people will understand it.
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