 SOT: About Bolt Ratings, Grade 8 is not appropriate |
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| McMark |
 Mar 4 2009, 12:52 PM
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914 Freak!  Group: Retired Admin Posts: 20,179 Joined: 13-March 03 From: Grand Rapids, MI Member No.: 419 Region Association: None  |
Hey guys, I was just reminded about a common misconception that I felt compelled to try and help dispel. It has to do with how fasteners are 'graded'. Often times you will see people talking about high stress joints and people insist on recommending 'Grade 8' bolts. But the fact of the matter is that SAE and Metric bolts are rated differently.
From a thread on TheSamba: QUOTE ISO (Metric) Grade 8.8 is the rough equivalent of SAE (US) Grade 5 ISO (Metric) Grade 10.9 is slightly stronger (in both yield and tensile strength) than SAE (US) Grade 8 It's quite common for people to go to the hardware store looking for 'Grade 8' metric bolts, see the 8.8 stamping on the head of the bolt, and think they've found the correct part. But the truth is, for high stress joints that require better quality fasteners, our cars need 10.9 bolts, not 'Grade 8'. |
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Posts in this topic
McMark SOT: About Bolt Ratings Mar 4 2009, 12:52 PM
Vacca Rabite You know, I had no idea... Thanks for this post. ... Mar 4 2009, 01:13 PM 6freak In my world S.A.E grade 5`s have 3 hash marks ... Mar 4 2009, 01:33 PM
Solo914
In my world S.A.E grade 5`s have 3 hash marks... Mar 4 2009, 01:41 PM 6freak I myself like 5`s for they can tell you things... Mar 4 2009, 01:56 PM 6freak Just read the rock crawler.com page ...wow .....I ... Mar 4 2009, 02:08 PM Trav012000 Our Chinese Tempering oven here at the factory use... Mar 4 2009, 02:23 PM davep You also have to consider the size of the bolt. Yo... Mar 4 2009, 05:12 PM 6freak
You also have to consider the size of the bolt. Y... Mar 4 2009, 09:21 PM MrKona I'm confused. :confused:
I always replace m... Mar 4 2009, 07:49 PM plymouth37
I'm confused. :confused:
I always replace ... Mar 4 2009, 10:53 PM McMark I'm not suggesting that SAE and Metric are int... Mar 4 2009, 11:05 PM  |
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