Bolt Size?
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See A Man About A Horse
Joined: Apr 2003
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From: Mariposa, Ca.
Bolt Size?
Can anyone tell me the actual bolt size used to secure the radiator to the core support? They are a flange-bolt.
I want to find and order longer ones, because I will be spacing back the radiator itself from the support to create a bit more room up-front for an A/C condenser . Thanks.
I want to find and order longer ones, because I will be spacing back the radiator itself from the support to create a bit more room up-front for an A/C condenser . Thanks.
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See A Man About A Horse
Joined: Apr 2003
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From: Mariposa, Ca.
Thanks to the both of you for the responses.
Can I tell for sure if they’re 5/16” or 3/8” by the size wrench/socket used on their heads?
Any sources for an exact duplicate bolt, just 1” longer?
Can I tell for sure if they’re 5/16” or 3/8” by the size wrench/socket used on their heads?
Any sources for an exact duplicate bolt, just 1” longer?
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Fleet Mechanic
Joined: Jan 2014
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From: Billings Montana
Most 5/16 bolts take a half inch wrench and 3/8 take a 9/16 wrench.
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See A Man About A Horse
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Lead Gopher
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Yes, dog-point being the unthreaded tip that actually helps get the bolts started and they went to coarse thread to help prevent cross-threading and the speed of installation on the assembly line. Less revolutions to tighten the same length bolt with a coarse thread than a fine thread. They called the washers Lockwasher - external tooth - 3/8" - Once you thread them onto the bolts they pretty much stay put. Sometimes called a Star lock.
Last edited by TA455HO; May 27, 2026 at 06:46 PM.
Cargo Master
Joined: Aug 2010
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From: Houston
My 63 had fine thread bolts holding the radiator in. One of the original clip nuts broke out when removing the original radiator, and I was unable to find replacement fine thread clip nuts. I ordered an assortment of new coarse thread clip nuts. The replacement radiator I bought ended up having the flange at the 6 cylinder location, two inches too far forward. I used 2" thin wall square tube to space the radiator back, and welded brackets onto the 2" tubes for the A/C condenser and the overflow bottle. The whole mess got painted black so it doesn't stand out and look terrible in the engine compartment. I used bolts purchased at the local hardware store.
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