Bolt Size?

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Yesterday | 06:57 AM

ibuzzard

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See A Man About A Horse

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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.

Yesterday | 08:24 AM

skidoorulz

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From: Billings Montana

I believe they are 5/16 24

Yesterday | 09:10 AM

TA455HO

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From: Seattle

From my 1966 trucks I have these. 3/8" - 16 x 1". 1964 often used a fine pitch thread in places that they changed to coarse thread for 1965-66.

Yesterday | 11:21 AM

ibuzzard

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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?

Yesterday | 11:27 AM

Christmas

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55 Pcs Nut and Bolt Thread Checker (25 Metric & 30 Standard), Bolts and Nut Identifier Thread Gauge, Detachable Bolt Size Finder Especially for Tight Spaces: Amazon.com: Industrial & Scientific

Yesterday | 01:29 PM

TA455HO

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From: Seattle

I just use my cheapy calipers to measure the thickness of the threads and then a pitch gauge to check the threads per inch count.

The pitch gauge works on nuts and bolts.

Yesterday | 01:53 PM

skidoorulz

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From: Billings Montana

Quote:

Originally Posted by ibuzzard

Most 5/16 bolts take a half inch wrench and 3/8 take a 9/16 wrench.

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Yesterday | 05:46 PM

skidoorulz

Fleet Mechanic

Joined: Jan 2014

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From: Billings Montana

Don't know the real term but I call it a flange head bolt with a star washer

Yesterday | 06:26 PM

#10

ibuzzard

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From: Mariposa, Ca.

Yes, I call them that too, but thought I’d heard them referred to as dog-point. Maybe I dreamt the whole thing.

Yesterday | 06:43 PM

#11

TA455HO

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From: Seattle

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; Yesterday at 06:46 PM.