Unisaw "cap screw"

  • Advertise with us

« back to Power Tools, Hardware and Accessories forum

Forum topic by Bergie37 posted 04-21-2019 12:12 AM 416 views 0 times favorited 5 replies Add to Favorites Watch
View Bergie37's profile


35 posts in 1822 days

04-21-2019 12:12 AM

I bought an old unisaw and I’m running through cleaning it up and I noticed that the bolt holding the motor to the mount is incorrectly sized. I have the pin, but the other side is a bolt that threads through the mount into the casting there. It is part 31 on e-replacement parts and they are calling it a “cap screw” but has no information on it. Anyone know what size bolt that is?

5 replies so far

View CaptainKlutz's profile


3139 posts in 2261 days

#1 posted 04-21-2019 12:43 AM

Just happen to have a 1974 Unisaw partially torn down in shop. Pulled the motor bolt.
My casting is threaded 7/16-20 based on my tap set, with 1” bolt holding motor.
Washer under head that clamps motor bracket is double thick.

PS – If you have a non-US made version, will be metric.

-- If it wasn't for bad luck, I wouldn't have no luck at all, - Albert King - Born Under a Bad Sign released 1967

View Nubsnstubs's profile


1723 posts in 2497 days

#2 posted 04-21-2019 12:48 AM

If you still have the old mis-sized bolt, take it to your local Ace hardware, and get sizes that are lager with varying threads to the one you have. Go home and try until you have the proper one. Then go back to Ace and get one that is at least Grade 5 or even Grade 8.

Looking at the bolt shown, it looks like it could be 7/16 or 1/2” -20 or 24 tpi. If you could figure out what the grid is, then you get the diameter pretty easy, but can’t really see those fine threads. If the grid is 1”, then the bolt is probably 1/2”....... Jerry (In Tucson)

-- Jerry (in Tucson)

View MrUnix's profile


8079 posts in 2966 days

#3 posted 04-21-2019 01:12 AM

What Klutz sez…
Part #31 from the Delta parts diagram lists it as: P/N 901-01-060-0644 (Old P/N SP-664) 7/16-20×1” Hex Hd Cap Screw.

They have been the same since the Unisaws introduction back in the 30’s (including the newly designed models from 2009 and on).


-- Brad in FL - In Dog I trust... everything else is questionable

View avsmusic1's profile


639 posts in 1452 days

#4 posted 04-21-2019 12:31 PM

This forum is awesome- just wanted to say that

View Bergie37's profile


35 posts in 1822 days

#5 posted 04-21-2019 12:43 PM

I agree! Thank you guys so much for the lightning fast response!

Have your say...

You must be signed in to reply.

DISCLAIMER: Any posts on LJ are posted by individuals acting in their own right and do not necessarily reflect the views of LJ. LJ will not be held liable for the actions of any user.

Latest Projects | Latest Blog Entries | Latest Forum Topics