Title says it all. The 5,000lb front axle of my 1965 C60 features 14x2.5" brakes. I was finally able to procure new drums, but I'm not sure what the torque spec is on the bolts that hold 'em onto the hubs. They're grade 10 bolts 1/2" diameter, so I guessed 80lbs/ft. However if that's not tight enough, now is the time when it's still pretty trivial to take the hub back off and tighten.
I just didn't want to warp my really expensive new drums!
You probably mean grade 8 bolts. Typical SAE bolt grades are 2, 5, and 8. Anyhow, the recommended (generic) torque for 1/2" Grade 8 coarse thread bolts is 80 ft-lb, and for fine thread - 90 ft-lb. LINK So your guess was pretty good.
Kevin 1951 Chevy 3100 work truck Follow this saga in Project Journal Photos 1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car) Busting rust since the mid-60's If you're smart enough to take it apart, you darn well better be smart enough to put it back together.
Right on. That's kinda what I remembered from way back, and yes I bought new grade 8 bolts to retain the proper strength. The old bolts had five lines, which meant grade 8; the new bolts have six lines with 'JH' in the center, so I guess that would be grade 9? I don't know. They were six bucks a bolt tho!
Check this web page for "JH" identification center marking as that ID's the manufacturer.
Check this web page for the "six" line grade marking on your bolts.
Just offered to clear up the identity of your bolts.
~ Dan 1951 Chevy 3 window 3100 Follow this story in the DITY Gallery "My Grandpa Carl's Truck and How it Became Mine" 1966 Chevelle (Wife's Hot Rod) | 2013 Chevy Silverado (Current daily driver) US Army MSG Retired (1977-1998) | Com Fac Maint Lead Tech Retired (1998-2021)
Thanks! Way back, no lines meant grade 3, so each line was a notch harder as in 3 lines meant grade 5, 5 lines meant grade 8. That's what the originals were. They are pretty big bolts. Kinda sad to see I paid so much for Chinese made bolts. NAPA sold them to me so I'm sure they're OK. Just, you know, wish NAPA still sold made in USA hardware, especially since I paid Made in USA dollars.
