Bolt Size/Thread - Radius arm to Beam

Cricket · Post by **Cricket** » Mon May 08, 2017 8:28 am

I'm mocking up a set up radius arms and beams, and I need to know the bolt size that fits the threaded collars welded inside the beams to attach the radius arms. Any spare parts I have are rusted beyond accurate measuring.

Thanks ahead for any help!

philofab · Post by **philofab** » Mon May 08, 2017 3:31 pm

3/4-10 Grade 8 or higher.

Pay attention to bolt length as it can interfere with axle.

Cricket · Post by **Cricket** » Mon May 08, 2017 6:08 pm

Thanks! Picked up some 3/4-10tpi x 1.5" long bolts, and with a washer they go just past flush of the threaded bungs inside

Cricket · Post by **Cricket** » Mon May 08, 2017 6:09 pm

Grade 8 of course

VintageIronFab · Post by **VintageIronFab** » Mon May 08, 2017 9:36 pm

Hey - heat those suckers up and run a tap to clean those threads - HUGE hassle time nightmare saver! HUGE!!!

Cricket · Post by **Cricket** » Tue May 09, 2017 5:24 am

Good advice, thanks! Fortunately these beams had been cleaned up already and the bolts pretty much threaded in by hand.

Tchajagos · Post by **Tchajagos** » Tue May 09, 2017 10:36 pm

For anyone else looking at this make sure the bottom bolt is close to the original size. If it's too long it will contact the inner axle and you will have a lot of problems.