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I asked that question about two years ago for my 253 screws should be the same.

Some answers I got:

"4-36 x 1/4 round head for the motor frame, 4-36 x 1/8 fillister for mounting the body to the frame".

"Wish you luck. 4-36 threads are an obsolete size and you won't find them in the big box stores. Look for a hardware store that's been at the same spot for sixty or more years".

You can do a search for the post by “Question: What are the scre size and threads for a Lionel 253".

There are some vendors that may have them, I would try Hennings first.

Hope that works as I did the #8's and 250 series locos.
Some one may have some other info to add.

 

Last edited by RonH
Chuck Sartor posted:

All prewar screws were 4/36. 4/40 didn't come into existence till after WW2.

The 4-40 can be forced in but you will bugger the thread a bit. I looked for the 4-36 fillister and round head screws. They can be found but it takes a bit. When you order the correct screws order more than you need as you may be doing more engines. The hunt for the parts is one of the best things to do. Reason is that when looking you will find other parts that you may need.

John H. Shetler posted:

Thanks Ron, opted for the 4/40 × 3/16 NOS from the bay. 4/40 worked in the past, if the hole threads were bad had to jump to next bigger anyway

 

Hi John, just a note both number 4 screws will be the same diameter. The difference between the 36 and 40 is just treads per inch. What you could do is to chase the existing 4-36 threaded hole with a 4-40 tap. At lest you will know that the threaded hole will have some 4-40 thread left. I would not over tighten it.

RonH posted:

I asked that question about two years ago for my 253 screws should be the same.

Some answers I got:

"4-36 x 1/4 round head for the motor frame, 4-36 x 1/8 fillister for mounting the body to the frame".

"Wish you luck. 4-36 threads are an obsolete size and you won't find them in the big box stores. Look for a hardware store that's been at the same spot for sixty or more years".

You can do a search for the post by “Question: What are the scre size and threads for a Lionel 253".

There are some vendors that may have them, I would try Hennings first.

Hope that works as I did the #8's and 250 series locos.
Some one may have some other info to add.

 

Dr Tinker has 4-36 screws.

Another place they are used is the hex head screws for side rods on some prewar locos.

 

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