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Bolt size |
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richy246 
AMC Apprentice 
Joined: Jun/09/2016 Location: UK Status: Offline Points: 57 |
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 Topic: Bolt sizePosted: Sep/06/2018 at 3:28am |
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What size bolts hold the spindle to the front suspension on 1967 rebel?
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farna
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Moderator Lost Dealership Project Joined: Jul/08/2007 Location: South Carolina Status: Offline Points: 19676 |
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Posted: Sep/06/2018 at 6:18am |
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IIRC they are 3/8" bolts on all the cars. You need grade 8 bolts for the spindle.
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Frank Swygert
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AMXFSTBK390
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Joined: Oct/22/2013 Location: SF Bay Area Status: Offline Points: 3489 |
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Posted: Sep/06/2018 at 11:13am |
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My 68 AMX disc brake spindles are on the work bench. The four bolts per spindle measure 7/16" dia x 3-3/4" long grade 8.
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Questions are powerful tools...what's in your toolbox?
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tomj
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Joined: Jan/27/2010 Location: earth Status: Offline Points: 7544 |
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Posted: Sep/11/2018 at 11:36pm |
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all AMC and rambler and nash spindle bolts (spindle, brake, knuckle steering arm) are 7/6-20 (7/16-NF) grade 8 bolts. lengths vary with application. only 7/16 and NF and grade 8. it's a critical part, i wouldn't mess. i'm increasingly paranoid about certain antique parts, and these are one of them. it's the one single place i've bought AN (aircraft) fasteners on my current car. these four bolts (each side) literally hold the entire car together and a failure would be catastrophic (though with four there's redundancy). also even expensive bolts are pretty cheap. |
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1960 Rambler Super two-door wagon, OHV auto
1961 Roadster American, 195.6 OHV, T5 http://www.ramblerLore.com |
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akimmet
AMC Nut
Joined: Aug/02/2012 Location: Republic OH Status: Offline Points: 428 |
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Posted: Sep/12/2018 at 9:25am |
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One thing that TomJ mentioned but didn't explain, is that fine thread hardware is stronger than coarse. Therefore don't substitute coarse thread hardware here.
Beware! Do not believe the sadly common rumor that grade 8 is more brittle and therefore has less shear strength than grade 5. This is not true at all! |
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mantonas
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Joined: Mar/21/2015 Location: Knoxville, TN Status: Offline Points: 196 |
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Posted: Oct/28/2018 at 1:25pm |
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Not to commandeer this thread, but I am currently doing a disc brake upgrade on my 75 Pacer using all parts from a 78 Concord. What is the torque specification to use in tightening the spindle to knuckle bolts? Is Loc-tite recommended?
Also, now I'm wondering whether I should buy some new bolts. I also had the thought that these 4 bolts are the only thing keeping my wheels from flying off and killing me. Where would one buy these bolts, in the specific lengths that I need (two 4 1/2" long, two 3 1/4" long, measured from the head of the bolt to the tip).
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1972 AMC Javelin SST
1973 AMC Ambassador 401 1975 AMC Pacer D/L 1976 AMC Pacer X 1976 AMC Matador sedan 1978 AMC Pacer V8 coupe 1987 Jeep Grand Wagoneer |
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Trader
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Joined: May/15/2018 Location: Ontario Status: Offline Points: 6882 |
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Posted: Oct/28/2018 at 2:54pm |
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Fastenal sells these bolt/cap screws and there are other suppliers.
With Fastenal you can get certified bolts. Just like the failing ARP a few years ago there are many questionable fasteners on the market today so for critical ones like these I go reputable suppliers. Grade 8 are more brittle (Rockwell hardness test) then Grade 5 but have higher tensile and shear strengths. The problem people usually have with breaking Grade 8 bolts is when used on exhaust headers or manifolds. These were always Grade 5 or lower as thermal cycling Grade 8's here makes them harden and fracture.
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PROSTOCKTOM
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Joined: Jun/20/2010 Location: Indiana Status: Offline Points: 2450 |
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Posted: Oct/28/2018 at 5:11pm |
Tom
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farna
Supporter of TheAMCForum
Moderator Lost Dealership Project Joined: Jul/08/2007 Location: South Carolina Status: Offline Points: 19676 |
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Posted: Oct/29/2018 at 6:12am |
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Any Grade 8 bolts will work, of the right length of course. I've NEVER heard of anyone having a spindle break off. If a wheel flies off it's usually due to a bearing nut working off or a bearing coming apart, or even ball joints breaking. It's rar that both ball joints would break, but more likely than breaking the spindle bolts!
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Frank Swygert
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mantonas
AMC Apprentice
Joined: Mar/21/2015 Location: Knoxville, TN Status: Offline Points: 196 |
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Posted: Oct/29/2018 at 7:28pm |
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What would be the tightening torque for the spindle-to-knuckle bolts? I took a look through my factory service manual but I could not find it listed anywhere.
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1972 AMC Javelin SST
1973 AMC Ambassador 401 1975 AMC Pacer D/L 1976 AMC Pacer X 1976 AMC Matador sedan 1978 AMC Pacer V8 coupe 1987 Jeep Grand Wagoneer |
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