98xjjeeper
NAXJA Forum User
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Will it be strong enough if i mig weld on tow hooks or should i bolt it? Also, where should i put them, two in the front ( one on both sides), one it the middle, or what? Thanks in advance!
98xjjeeper said:Will it be strong enough if i mig weld on tow hooks or should i bolt it? Also, where should i put them, two in the front ( one on both sides), one it the middle, or what? Thanks in advance!
sidriptide said:my understanding is that the heat generated by the welding process weakens the steel of the forged hooks. which, in turn, compromises the weight rating of the hook. i'm not a metalurgist but this was told to me by long-time welder/fabricator so i give it alot of credit.
98xjjeeper said:Will it be strong enough if i mig weld on tow hooks or should i bolt it? Also, where should i put them, two in the front ( one on both sides), one it the middle, or what? Thanks in advance!
Zuki-Ron said:Grade 5 hardware will put up with more force in shear than grade 8 because it's less brittle.
Phil said::huh: How do you figure? My Mechanical Engineering Design text has a table listing the SAE minimum specifications for bolts. It says Grade 5 bolts up to 1" diameter have a minimum proof strength of 85 ksi, and Grade 8 bolts have a minimum proof strength of 120 ksi. Now, since the shear of a bolt is (0.577*Sp/nd), how could a Grade 5 possibly be stronger?
Putting the shear load on the unthreaded shank of the bolt would allow for a force of (0.577*pi*(d^2)*Sp/nd), right? Using two similar bolts, you'd have identical d values, and I would want the same factor of safety nd, and pi is a constant, and 0.577 is a constant. How could you possibly have a higher allowable force, with a lower proof strength Sp?
If I missed something, please help me, because I've got a final exam coming up.
GSequoia said:I'm surprised nobody has asked the number one question reguarding tow hooks...
98xjjeeper just where do you plan to bolt these tow hooks?
You cannot just bolt the hooks straight to the bumper, body, or "frame" or you will suffer very, very bad things.
98xjjeeper said:I am new to this so sorry if i sound dumb. I thought you can just drill some holes and bolt them up on the frame.
Gil BullyKatz said:Just so you know...
XJ's don't have a "frame" per se...
Unibody/uniframe...
There's a few companies that sell a kit that includes a nice beefy bracket suitable and strong enough for mounting tow hooks...
bj-666 said:the common misconseption is that grade 5 will give a little more and bend before it breaks giving you a warnign sign. well grade 5 may bend but grade eight's yeild strength is stronger than grade 5's break strength.
,RonGrade 5 hardware will put up with more force in shear than grade 8 because it's less brittle.