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#1
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Bolt grade question
Lower ball joint replaced on my 91 300te 4matic and sound is gone but...
I stripped the bolt running through the pinch clamp accidentally (of course ![]() |
#2
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Quote:
![]() Some things matter less, this is not one of them.
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Strelnik Invest in America: Buy a Congressman! 1950 170SD 1951 Citroen 11BN 1953 Citroen 11BNF limo 1953 220a project 1959 180D 1960 190D 1960 Borgward Isabella TS 2dr 1983 240D daily driver 1983 380SL 1990 350SDL daily driver alt 3 x Citroen DS21M, down from 5 3 x Citroen 2CV, down from 6 |
#3
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Answer
Quote:
Look at the strength difference in these charts. http://www.americanfastener.com/technical/grade_markings_steel.asp http://www.boltdepot.com/fastener-information/materials-and-grades/bolt-grade-chart.aspx http://www.boltscience.com/pages/faq.htm http://euler9.tripod.com/bolt-database/22.html .
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ASE Master Mechanic asemastermechanic@juno.com Prototype R&D/testing: Thermal & Aerodynamic System Engineering (TASE) Senior vehicle instrumentation technician. Noise Vibration and Harshness (NVH). Dynamometer. Heat exchanger durability. HV-A/C Climate Control. Prototype Vehicle build. Prototype Fleet Durability Prototype vehicle instrumentation. Technical Quality Auditor. Automotive Technical Writer 1973 300D 1973 309D - stolen 1978 280SE 1980 240D 1983 300D 1984 190D |
#4
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So, what happens when you use a different grade bolt...?
Not as strong...given Depending on the torque, it may yield with the applied preload + service loads Different loosening behavior (especially if you can't apply the same preload) Different material = different susceptibilities to corrosion, stress cracking, etc. If it works...keep it the same. If you feel like modifying it - you better know what went into the design and be capable of making the proper assessment ![]()
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1982 240D, sold 9/17/2008 1987 300D TurboW124.133 - 603.960, 722.317 - Smoke Silver Metallic / Medium Red (702/177), acquired 8/15/2009 262,715 and counting ![]() |
#5
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Thanks for the input, I plan on changing it Monday with one from the dealer. I am cautiously driving around town for essentials only until it is replaced, actually, I think I will just ride my bike to the grocery store.
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#6
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Just installed the correct nut and bolt from the local MB dealership, I feel a lot more confident now with the $8.00 set in there versus the grade 5 freebie from lordco!!!
![]() Thanks for the input. |
#7
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Excellent
Hope you get many years of pleasure driving it.
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#8
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what's a pinch clamp?
What was the marking on the old bolt ? 8.8 metric approximately grade 5 10.9 approx grd 8 steel socket headed cap screws are generally grd 8 unless they are stainless. |
#9
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http://i284.photobucket.com/albums/ll4/pwogaman/1990%20Mercedes%20300TE/100_1166.jpg
That is the pinch clamp i referred to. The new bolt MB part number = 129 990 10 01 The old bolt has been binned. |
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