These bolts are 5/6-18 and are to long. Also ...
347020
These bolts are 5/6-18 and are to long. Also they are not self tapping. Original bolts are metric M8*1.25. If spindle is threaded, make sure you use the correct bolts. i ended up purchasing some 5/6-18 bolts that were 1" long and a tap.
2936472
First they are not 3/8", the shaft is less than 1/4" and the threads only approach 5/16". This must be the 'new' system of measurement mandated be their lawyers. Rant completed. Hope they hold the weight!
4025848
I suppose these screws are fine over all but I expected, (and I copied this directly from the product description) "25mm Length, Fully Threaded".  The screws they sent to me the threads stop six mm from the head.  I need to thread this fully into a plate and have the threads stick out the other side so I can not use these screws.
Be ware.
1423280
the longer bolts are actually to long had to buy my own after installation was complete the exhaust rubs on the cross member not the kit for me
773850
Bolts too long, so I can't put this together. Seems like this problem has been recurring for over a year. Get it together Amazon/Petmate, (literally)
4071948
This lift kit is made of quality materials. But, after installation the U-bolts hang 2 1/2" below the nuts. This company must use the same bolts for the 4, 5 and 6 inch lifts. Mine was a 4". Now I will have to saw them off. What a pain in the a__. See attached picture.
4674149
Bolts are to short to use with our oem exhaust on our 2002 Beetle. We substituted longer bolts to get by .
1655187
Item description says: "Size: 5/16" - 20 x 2-1/4" wich is NOT CORRECT! Actual size is: 5/16-18

If you just want to bolt down a toilet, it won't matter, but if you are looking for a 5/16" x 20 tpi bolt you will be disappointed. I have contacted both Amazon and Plumb Pak, but as of 8/22/17, the description is still inaccurate.
283532
a little too long... Only works well with the thicker backpack straps. Old, shorter bolts worked with thinner backpack straps. Just lookin' for something in between
2648304
The screws were too small in diameter for the holes. Even for rear holes that are machined (by car's manufacturer I suppose). Had to go to hardware store to get 1/4" ones. And I only bought this because I didn't want to spend time buying the right bolts.
3686801
This mount will work but not a replacement for OEM.  I will not buy again! Delayed completion chasing down bolts that fit.  Requires new grade 8 bolts longer than OEM. Also required reaming out bolt holes to get all the bolts to somewhat fit.  They are tough metal and will break drill bits while you make the bolt holes bigger.  They are not shaped exactly as the OEM mounts.  The bolting flanges should b the same on both sides.  These mounts have one flange higher than the other.  They should both be lower.  Huge pain to install. Should have been 20-40 minute install.  Took me 5 hours to install, modify, and get new bolts that worked.
2504133
Do not buy these.  They sent me regular 5/16"-18 bolt that you can get at hardware store.  These are not shear pins.  Made in China on box. Junk
1718581
This bolt is too short for my Rock n Roller cart. I was only able to get one rotation on the wing nut which  promptly loosened up and fell off followed shortly after with the bolt itself falling out and lost. The originals are at least 1/2" or  more longer.
2717924
I should have listened to other reviews...received but bolts are wrong set on pkg doesnt fit and looks different than pic on assembly instructions. Based on the number of complaints it appears there is an issue with assembly line quality. Its a gamble if you will receive the correct parts. Dont buy.
1932860
The bolts that we received were not fully threaded.  We are not sure if this will be a problem yet, they look like they might work with only the  partial threads.  If they don't the seller will hear about it.
2721243
I used this with the Zinus 14 inch smartbase and it worked fine except that the given bolts are much too long and I had to pick some up from the hardware store.
3078190
This is a quality item, especially for the price, but...Beware these are 8mm, not 6mm as stated, the bolts are only 1" long not 1 1/4". As another reviewer said they will not go through a piece of 3/4 plywood.  They also are not compatible with the Shop Fox brand of T-Track unless you grind the head down a bit.  All things said I am happy with the purchase once I figured out what size the bolts truly are.