windshield wiper posts

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Sep 16, 2024 | 03:21 PM

huppler1

Thread Starter

Junior Member

Joined: Sep 2024

Posts: 1

windshield wiper posts

what are the TPI on the 5/8" posts that the wiper blades are fitted to? would it be 5/8"x24.........I know for certain that fine thread 5/8"X18 is too coarse.
Thanks!

Sep 16, 2024 | 09:34 PM

thomas77

Senior Member

Joined: Mar 2022

Posts: 980

From: Idaho

Welcome to the forums. That's a good question, during those years they only used course and fine threads. Metric was not used until the 80s. Unless something had been changed.

Sep 17, 2024 | 03:56 PM

73shark

Super Moderator

Joined: Apr 2006

Posts: 4,213

From: KC, MO area

Welcome to the forum. See if you can find a thread pitch gauge at a hardware store. Similar to a feeler gauge only it has teeth on it with different spacing for the different thread pitches.

Dec 17, 2025 | 04:51 AM

hikoma

Junior Member

Joined: Nov 2025

Posts: 29

Quote:

Originally Posted by huppler1

What are the TPI on the 5/8" posts that the wiper blades are fitted to? Would it be 5/8"x24… I know for certain that fine thread 5/8"x18 is too coarse, and I’m also curious how much do DIY repairs save when replacing these parts myself.
Thanks!

For 5/8" wiper blade posts, the standard thread is typically 5/8"-24 UNF (Unified Fine Thread). You’re correct that 5/8"-18 would be too coarse. So the TPI (threads per inch) you’re looking for is 24 TPI.