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Implement Alley Discussion Forum

Getting down the nuts and bolts of the situation.

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Dale-SWMI

05-02-2004 18:19:50

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I�m replacing the fasteners on my Ferguson 9 tine spring tooth cultivator. I went to the local farm supply store and noticed the nuts and bolts came in several classes from 2 through 9. Plow bolts were class 5. The higher the class equated to a higher cost for the hardware.

My question is what difference to me (for a replacement bolt on my cultivator) will a class 2 bolt make as opposed to a class 5? Why would I want to spend the extra money for a class 5 bolt?

Also, some of the bolts came in fine thread and some in course. (The bolts I taking off are fine thread.) Again, what difference would it make if I used a course thread bolt (and nut) as opposed to a fine thread bolt (and nut) as a replacement fastener on my cultivator?

I don't mind spending a little more for the replacement fastners if there is a good reason to do so. I'm clueless as to what the uses might be for the different classes of fastners.

Thanks in advance for any help/advice you can give.

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paul

05-03-2004 20:05:36

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Re: Getting down the nuts and bolts of the situati in reply to Dale-SWMI, 05-02-2004 18:19:50

Grade 2 is much softer & weaker. It will bend or shear off or stretch. Grade 8 is very hard, very strong, does not change dimention but more brittle. Five is in between. If you really, really need to clamp something together, grade 8 is good, has the most holding power. For general use on older equipment, gr 2 is fine.

I suspect the gr 5 plow bolts will wear & last a little longer, and will not shear off on a rock or so as easily. You decide if that is important to you.

--->Paul

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Justin-PA

05-03-2004 13:05:28

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Re: Getting down the nuts and bolts of the situati in reply to Dale-SWMI, 05-02-2004 18:19:50

Grade 2 bolts are usually used on farm equipment as "shear bolts", where safety is a concern. For example my two bottom plow uses grade 2 bolts. If I would hit a rock/stump/etc. while plowing, the bolts would break, thus preventing damage to the plow and/or tractor. If that is not a worry, I usually go with Grade 5 bolts.

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Paul Janke

05-02-2004 19:58:38

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Re: Getting down the nuts and bolts of the situati in reply to Dale-SWMI, 05-02-2004 18:19:50

Grade 5 is probably the most common these days, followed by grade 2, and then grade 8. Grade 8 is much stronger, but is also more brittle. I find on things which bend the bolt, grade 5 can actually be less apt to break than grade 8. I don't know how high they go, but I have seen grade 15. Fine thread is not very common any more.

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Leroy

05-02-2004 19:17:02

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Re: Getting down the nuts and bolts of the situati in reply to Dale-SWMI, 05-02-2004 18:19:50

Fine thread to tighten tighter and not loosen up, don't think you will find fine thread in grade 2

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