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 01-03-2005, 07:32 Post: 103338
millsg



Join Date: Aug 2004
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 Ask a Stupid Question -- Shear Pins Special

I must admit that I am a city boy who is making a slow migration to the farm life (hey, maybe they could make a TV show about this!).

This weekend my wife drove her tractor into a hole while mowing with her King Kutter rotary mower. By doing so the mower's shear bolt did its thing and sheared.

My question is this, are bolts of this type a special type of bolt or will any standard bolt work as a replacement? The bolt head has 307A & CYI on it, I assume this means something.






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 12-21-2005, 11:28 Post: 121472
Marco Magnifico
2005-12-21 00:00:00
Post: 121472
 Ask a Stupid Question -- Shear Pins Special

FYI, those same markings are present on a set of "strut tower mounting bolts" for a 1966 Chevy II Nova that I just purchased from Classic Industries. Looks like a standard carriage bolt, about an inch long x 5/15".






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 12-21-2005, 11:36 Post: 121474
BillMullens

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 Ask a Stupid Question -- Shear Pins Special

They make a special shear bolt, but most people use a regular bolt (not grade 8).

Good luck on the country way of life.

Bill






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 12-21-2005, 13:07 Post: 121481
wingwiper



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 Ask a Stupid Question -- Shear Pins Special

That is the temper of the metal in the bolt, so it will Shear. The harder the bolt, the less apt it is to shear and the more apt that you will have a repair bill for other than a shear bolt. You know like fuses, some people in my early days would by-pass the nusieance of the fuze by replacing with a penny or tin foil and then wonder why half of the dash went up in smoke the next time.. No one I know......






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 12-21-2005, 13:28 Post: 121482
DK35vince



Join Date: Feb 2002
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 Ask a Stupid Question -- Shear Pins Special

From my King Kutter owners manual " If you sheer the bolt that attaches the PTO shaft to the gearbox replace with a grade 2 bolt only."






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 12-21-2005, 13:49 Post: 121483
greg_g



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 Ask a Stupid Question -- Shear Pins Special

Before anybody else responds, note that the original question is nearly a year old

//greg//






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 12-21-2005, 15:53 Post: 121493
kthompson



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 Ask a Stupid Question -- Shear Pins Special

Greg,
do you think he may have it fixed or wrung in two by now?

Now, this is a good place for someone to tell how you know which grade a bolt is by the markings on the head. Also I understand the same holds for nuts.

kt






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 12-21-2005, 16:24 Post: 121498
Billy

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 Ask a Stupid Question -- Shear Pins Special

Grade 2 has no markings. Grade 5 has 3 lines. Grade 8 has 5 lines. Metric bolts will have the class stamped into the head.






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 01-04-2006, 20:49 Post: 122262
Carldarnell



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 Ask a Stupid Question -- Shear Pins Special

The american bolts are as Billy stated. However, I have seen bolts with 2 marks on them indicating a grade 4 bolt. Normally they start at three marks indicating a grade 5 bolt. They can then have 4 marks for grade 6, 5 marks for grade 7 and 6 marks for grade 8. Nuts with dashes around the flat area that contacts the parts held together are hard nuts, grade 8 I think. Nuts that have an indentation on three of the flats that a wrench would touch are locking nuts.






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Discussion Boards > Active Subjects > Messages as Posted > Tractor Implements Forum

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