If mounting a hydro boost on a firewall that is thicker due to mounting procedures, soundproofing, etc., double or long nuts used in supporting ceiling fixtures are common hardware items, even metric.
Turn down part way to give proper thread engagement, add a suitable washer and mount up.
Ed
'37 GMC T-18 w/ DD 4-53T, RTO-610, 6231 aux., '95 GMC running gear, full disc brakes, power steering, 22.5 wheels and tires. '47 GMC 1 ton w/ 302, NP-540, 4wd, full width Blazer front axle. '54 GMC 630 w/ 503 gasser, 5 speed, ex fire truck, shortened WB 4', install 8' bed. '55 GMC 370 w/270, 420 4 speed, grain, dump bed truck from ND. Works OK.
Frank, thanks. While I am thinking about hydro boost units, they are attached by 16mm nuts, almost need a deep socket which I am sure no-one carries, and they have always been extremely tight. If one doesn’t insert the drive extension all the way into the socket, it will usually be deep enough to get the job done with a normal socket.
Ed
'37 GMC T-18 w/ DD 4-53T, RTO-610, 6231 aux., '95 GMC running gear, full disc brakes, power steering, 22.5 wheels and tires. '47 GMC 1 ton w/ 302, NP-540, 4wd, full width Blazer front axle. '54 GMC 630 w/ 503 gasser, 5 speed, ex fire truck, shortened WB 4', install 8' bed. '55 GMC 370 w/270, 420 4 speed, grain, dump bed truck from ND. Works OK.
16MM is the same as 5/8". Use a 4" long 5/8 socket that's usually used over the long studs on a Jacobs engine brake installatiion on a Cummins diesel engine. Aren't those coupling nuts Grade 2? Is that alloy strong enough to be used to mount brake components? Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt! There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway Love your enemies and drive 'em nuts!
Coupling nuts are available in Grade 5 and Grade 8, but you probably have to specify those to get them instead of the butter-soft ones.
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.
Yes. I wouldn't use nuts or bolts from Home Depot to mount anything on a vehicle. Go to McMaster-Carr or a fastener supplier to get known high grade fasteners.
Last edited by Otto Skorzeny; 05/22/20222:01 PM.
1950 Chevrolet 3100 (Ol' Roy)
1939 Packard Standard Eight Coupe (The Phantom) | 1956 Cadillac Coupe de Ville (The Bismarck) | 1964 Ford Galaxie 500 coupe |1966 Ford Mustang (Little Red) | 1969 Pontiac GTO (The Dishpit) I 1979 Ford F-100 | 1976 Ford F-150 (Big Red) | 1995 Ford F-150 (Newt)
