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Tool Talk Discussion Forum

Grade 5

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FarmerDave

02-10-2005 15:12:51




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CityBoy neighbor has a nice post hole digger. He's put a grade 5 bolt in for the shear pin. Then somehow it got bent. Am I gonna be able to cut that bolt with cutting oil, 18 TPI bimetaliic blade and the sawzall?




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FarmerDave

02-13-2005 15:38:33




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 Re: Grade 5 in reply to FarmerDave, 02-10-2005 15:12:51  
I cut it this weekend with a 14 TPI which claimed to be for heavy metal. It was a little slower than grade 2. But not too bad...



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Galen

02-10-2005 19:54:40




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 Re: Grade 5 in reply to FarmerDave, 02-10-2005 15:12:51  
in short - yup - sawzall and bi-metal blade will cut it in a few seconds.



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hooker

02-10-2005 18:19:28




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 Re: Grade 5 in reply to FarmerDave, 02-10-2005 15:12:51  
forget the hacksaw and oil take a 4 1/2" angle grinder to it in ten seconds, that bolts gone and your back in the easy chair with a cold beverage



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NC wayne

02-10-2005 18:01:14




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 Re: Grade 5 in reply to FarmerDave, 02-10-2005 15:12:51  
You should be able to cut a grade 5 with a bimetal blade with no problems. Heck if it's a good bimetal blade you can cut a grade 8 if you take your time doing it...now drilling it without carbide is another story...



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thurlow

02-10-2005 18:00:20




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 Re: Grade 5 in reply to FarmerDave, 02-10-2005 15:12:51  
Grade 5 is just the "standard" that most farmers have the full assortment of... in their bolt bins; except for special applications, it's what farm machinery is put together with. As Mac suggested, it will cut easily with a hacksaw or something similiar (no oil needed). I assume if you can get to it with a sawzall, you can get to it with a hammer; just straighen it out a little and drive it out..... .

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buickanddeere

02-10-2005 17:27:02




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 Re: Grade 5 in reply to FarmerDave, 02-10-2005 15:12:51  
Grade three bolts are made of 74,000 psi alloy, grade five 120,000 psi alloy and grade eight 150,000 psi alloy. I've seen promotions for ARP connecting rod bolts at 220,000 psi. That said steel alloys vary in elasticity and yield strength. A 100,000 psi that snaps like glass or cold cast iron when shock loaded isn't usable. A 50,000 psi alloy may bend a little but not break and works fine. Then again with metal alloys, you can make a 50,000 psi bolt that snaps like glass on a shock load. And a 200,000 psi alloy that will flex a little and not break under 4 times the stress. All that to say, depending on the grade 5 bolt if it's brittle or elastic, sounds like the later.. The metal pipe the augur flutes are welded to is likely even "softer & more flexible" to avoid breakage when hitting stones. Odds are the augur shear pins holes are now stretched out even larger now with the #5 bolt. There likely was some play in the holes earlier that kept breaking the #3 bolts hence the bolt upgrade. That bolt may or maynot cut with the sawsall and a good blade. Go slow and have someone dribble a little water on the cut to keep the blade cool. This will avoid work hardening the bolt making a plasma cutter or a cutting torch the next step. At the very least fresh bolt holes in the augur shaft will be required or you will get to do all this again. By the way I've know some rural people who are a dumb as a box of rocks and urbanites that are pretty smart. I've also seen people who are experts in one area but make beginner's mistakes in subjects that are new to them. Doesn't make them stupid.

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FarmerDave

02-11-2005 05:46:34




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 Re: Grade 5 in reply to buickanddeere, 02-10-2005 17:27:02  
It's grade 5 because that's all they stock at the local MFA. Until you get a little experience with this stuff, a bolt is a bolt.

As far as this being tuition, this is a Danuser PHD and a 12" auger. I think a new one is around $1800. This one came used. I am a little concerned about the driveshaft on his new Mahindra too.



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buickanddeere

02-11-2005 13:50:04




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 Re: Grade 5 in reply to FarmerDave, 02-11-2005 05:46:34  
I like those post hole diggers with the hydraulic drive. The relief valve opens or the hydraulic motor just stalls should the auger jam. If stuck under a stone, backing out is handy.



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MAC,IL

02-10-2005 17:49:27




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 Re: Grade 5 in reply to buickanddeere, 02-10-2005 17:27:02  
Get a good saw blade and have at it. I have cut 8 with a hacksaw.



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dr.sportster

02-10-2005 18:58:41




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 Re: Grade 5 in reply to MAC,IL, 02-10-2005 17:49:27  
Mac I agree everyone is overrating the hardness here.I cut Grade 8 allens and hex bolts alot with a cheap{but sharp] hacksaw and drillout heads for saftey wire with regular small drill bits.Ive drilled and tapped bolts also.Ive also shaved grade 8 allen bolt knurling off in a lathe no problem.Sixty strokes a minute the boss used to yell.



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dr.sportster

02-10-2005 19:02:32




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 Re: Grade 5 in reply to dr.sportster, 02-10-2005 18:58:41  
By the way the wifes wedding ring was made out of a stainless steel bolt.She loves it and jewlers dont have a clue what metal it is.



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Brian G. NY

02-11-2005 08:05:54




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 Re: Grade 5 in reply to dr.sportster, 02-10-2005 19:02:32  
My Dad worked in Savage Arms in WWII building 50 cal. machine guns. He made his wedding ring out of a hunk of the SS barrel. My gold wedding band is nearly worn thru in the 43+ wears I"ve been wearing it. Dad was married over 60 years when he died and I don"t think you could hardly see any wear on his. LOL



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Bill WI

02-11-2005 08:03:45




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 Re: Grade 5 in reply to dr.sportster, 02-10-2005 19:02:32  
Let's hope you folks are together til the ring wears out. Just shows you were thinking, not cheap. lol



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buickanddeere

02-10-2005 21:42:37




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 Re: Grade 5 in reply to dr.sportster, 02-10-2005 19:02:32  
I assume the ring has a left hand thread?



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dr.sportster

02-11-2005 06:46:08




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 Re: Grade 5 in reply to buickanddeere, 02-10-2005 21:42:37  
Thats prety funny.She also told me that the jewler probably knew it was stainless and just didnt want her to be embarassed at having such a cheapskate for a husband.



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Norbo

02-10-2005 16:39:46




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 Re: Grade 5 in reply to FarmerDave, 02-10-2005 15:12:51  
Hey FarmerDave
I cut a grade 8 bolt with a sawzall while back. You need patience and a carbide grit blade. Its just a steel blade with carbide pieces bonded to the cutting surface. It cost bout 3 bucks at the ace hardware. These blades will last a long time if ya dont bend em. Still use mine when I need to.



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RickB

02-10-2005 16:13:39




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 Re: Grade 5; bolt school in reply to FarmerDave, 02-10-2005 15:12:51  
You will cut it, but not where you need to. It won't drive out because it is partially sheared. may as well let him run it until it fully shears off, then replace it with the proper bolt. If he wrecks an auger or shaft in the meantime, call it tuition.



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Ludwig

02-10-2005 16:05:09




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 Re: Grade 5 in reply to FarmerDave, 02-10-2005 15:12:51  
Seems like a cutting wheel would work better than the sawzall. I've not had a whole lot of luck cutting metal with the sawzall.



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bo

02-10-2005 15:41:34




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 Re: Grade 5 in reply to FarmerDave, 02-10-2005 15:12:51  
Yup.....well...you'll know in about 5 secs.



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Charles (in GA)

02-10-2005 15:35:32




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 Re: Grade 5 in reply to FarmerDave, 02-10-2005 15:12:51  
I think so, a grade 5 bolt is not that hard, its a good bolt but not so hard it won't cut.

Charles



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