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These bolts okay to use?
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Valkrider
Posted 1/30/2017 8:55 PM (#92209)
Subject: These bolts okay to use?


Veteran

Posts: 111
100
Location: Fort Smith, Arkansas
Started installing my Valkyrie mount kit today. Putting on the front upper attachment adapter I find the 60mm long provided bolts are way too short to be able to put the nuts on. Went to Lowes and bought some longer metric bolts. No idea what grade they are. Head is marked 10.0 which i assume represents the bolt diameter and and upper case NY. Does the NY represent anything. Here is a picture of the package. Never paid much attention to bolt grades but reading sidecar forums has me concerned if these are appropriate. Thanks



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OldSchool_IsCool
Posted 1/30/2017 9:22 PM (#92211 - in reply to #92209)
Subject: Re: These bolts okay to use?



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Location: Michigan - Kalamazoo
This might help

https://www.boltdepot.com/fastener-information/materials-and-grades/...

I did some calculations and units conversions. SAE Grade 8 has a load rating of 120,000 PSI (Pounds per Square Inch). If I did my figures correctly, that's 827 MPa (mega Pascals).

Hopefully someone who knows what they are talking about will be along soon.

Edited by OldSchool_IsCool 1/30/2017 9:30 PM
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Valkrider
Posted 1/30/2017 10:08 PM (#92212 - in reply to #92211)
Subject: Re: These bolts okay to use?


Veteran

Posts: 111
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Location: Fort Smith, Arkansas
Thanks oldschool. With that info andlooking a lot closer I can now see that the bolt head is not marked 10.0 as I assume that was the 10mm diameter but is actually 10.9. (Kinda hard to make out) . Thats 830mPa or a grade 8 equivalent.
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Stryker
Posted 1/31/2017 8:03 AM (#92213 - in reply to #92209)
Subject: Re: These bolts okay to use?


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Take. a picture of the head of the bolt. I believe you will find these are just grade 3 or 5. I don' recall ever seeing grade 8 bolts at Lowes
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Peter Pan
Posted 1/31/2017 9:58 AM (#92216 - in reply to #92209)
Subject: Re: These bolts okay to use?



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Location: San Isidro de Heredia, Costa Rica
I assume you read wrong again.
grade 4.8 equals 400 Newton per square mm and 8 percent elongation before breaking equivilant = grade 3 = no mark at all (locally called carne de vaca=cow's meat. so soft they strip like butter=very often used in chineese garbage)
grade 8.8 equals 800 Newton per square mm and 8 percent elongation before breaking equivilant = grade 5 = marked triangle or 3 marks (reasonable thrength for most jobs)
grade 10.6 typical equals 1000 Newton per mm2 and 6 % elongation before breaking, equvilant = grade 8 = marked six marks (for solid joints, when they break, they break away clean and you just can turn out the broken thread with a chissel and plier)
grade 12.4 typical equals 1200 Newton per mm2 and 4 % elongation before breaking, equvilant = grade 10 = marked 8 marks (used for ultra strong yield aplications like in tower building, cranes etc. When they fail, mostly they strip out the thread from the base part / If bent or deformed they need to be thrown away, because they do not show obvious elongation before breaking)

Always have a look at screw and nut to match them well. Better have a stronger nut then a soft nut. An unmarked nut strips like butter!
By the way the russian screws in the clutch of Ural rigs are grade 10.6 in the screw section, but not in the internal allan hexagon. Once bad treated the allan head you have to punch them out with the chissel. Guess how I learned that one.

Hope this helps.

Edited by Peter Pan 1/31/2017 10:04 AM
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Hack'n
Posted 1/31/2017 3:25 PM (#92223 - in reply to #92213)
Subject: Re: These bolts okay to use?



Expert

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Location: Boise, Idaho
8.8 metric are at Lowe's. Theyr're often used for Grade 5 or 8 SAE.

Lonnie

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