On Monday, October 31, 2011 at 3:56:08 PM UTC-5, micky wrote:
Wrench size is dependent on bolt strength or grade. For UNC bolts, wrench
size is 1.5 times the bolt diameter. For example, 3/8-16 course thread bol
t, grade 3 or 5 is =1.5*3/8 or =3/8 + 3/16 which equals a 9/16" wrench.
For a 1" bolt, again grade 3 or 5, the wrench size is 1.5 times diameter
or 1.5 times 1" which is a 1 1/2" wrench. For extra heavy nuts, or 2H nuts
, add 1/8" to wrench size. For example, a 5/8" bolt with a 2H nut will req
uire a wrench sized as follows: 1.5 times 5/8 or 15/16" plus 1/8" or a 1 1
Metric bolts are somewhat the same, as wrench size is dependent on bolt str
It isn't the bolts that are confused, it's micky. Bolt size is the bolt diameter, not the head size.
1/4" bolts have 7/16" heads, for example -- the head size is *always* larger than the shaft
diameter, else the head wouldn't be of much use, would it?
Try it, it won't work. Draw a circle, put a hex inside it of the same
diameter. There will be no shoulder strength. Applying the hex head wrench
will twist off the "castle". May as well put a slot in and use a flat blade
screwdriver, they are made for light applications but one can put plenty of
torque on a screwdriver and mangle it. The reason hex heads are used because
one can get more clamping force without cam out.
On Tue, 25 Aug 2015 12:47:01 +0000 (UTC), Doug Miller
Not "always" - 12 point heads on "header bolts" and some cyl head
bolts can be the same size as the bolt thread diameter - but they are
"flanged" bolts. Some old "plough bolts" also used a square heas the
same size across flats as the thread size.
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