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1967 - 1972 F-100 & Larger F-Series Trucks Discuss the Bumpsides Ford Truck

Leaf Spring Center Bolt Size?

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Old Apr 28, 2020 | 07:59 AM
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Leaf Spring Center Bolt Size?

I have a 70 F100, short wb, 2wd, flare side. Does anyone know what size the rear leaf spring center bolts are? All of the websites I have been able to find just list a bunch of generic sized bolts. I suspect either 5/16" or 3/8".
 
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Old Apr 28, 2020 | 08:56 AM
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Center bolt

3/8” 24 and try to get grade 8 .
 
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Old Apr 28, 2020 | 09:16 AM
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Thanks! I'm going to order some today.
 
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Old Apr 18, 2021 | 10:00 AM
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Thanks everyone!! Are we saying I need 3/8 x 24 bolts? The head of the bold was 18mm?

Jeff
 
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Old Apr 18, 2021 | 12:53 PM
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The bolt has a width of 3/8 of inch, with 24 threads per inch. The head size for English-SAE sized fasteners is not made for metric but some can be used as they are sometimes more precise if the head is stripped.
 
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Old Apr 18, 2021 | 02:02 PM
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Pogo - which bolt? A shackle or hanger? I've never seen anything that big (18 mm) on bolt that holds the spring stack together.
 
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Old Apr 18, 2021 | 08:42 PM
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Rich and Pat, I found grade 8 replacement bolts at Home Depot of all places. I really appreciate the help. This really is the best forum.

for the record my truck has the same bolts on the shackle and hanger.

Thanks everyone!! Pogo
 
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