Bolts Breaking on Rear axle
Road Master
Joined: Nov 2013
Posts: 1,239
Likes: 356
From: virginia
SS has less tensile strength than grade 8. Tensile strength is what you need for clamping force. (ultimate tensile strength ) Don't know about hardness, that's completely different, it is resistance to deformation.
Road Warrior
Joined: Jun 2017
Posts: 1,705
Likes: 1,017
From: Lawrenceville Ga.
Extreme HDF Member
Joined: Jun 2014
Posts: 11,448
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From: NW Ohio
There many different grades of stainless. ARP uses (essentially) 17-4 PH (precipitation hardened) rated at 170,000 tensile. Typical grade 8 is rated at 150,000.
I don't have (ie, haven't looked for) any data on shear, shock, ductility, etc.
I don't have (ie, haven't looked for) any data on shear, shock, ductility, etc.
the price just doubled after i bought it...
shady....
Last edited by cvaria; Oct 16, 2017 at 05:23 PM.
Seasoned HDF Member
Joined: Jan 2015
Posts: 16,031
Likes: 7,152
From: Sandy Eggo's North County
Are the bolts failing due to power pulses? This is why “crush drive” systems were developed with the chain drive bikes.
If this is the case, then HD might look into a 6 bolt pattern, instead of 5.
For automobile wheels, a 5 bolt wheel is 40% stronger than a 4 bolt. (According to Chrysler.)
We all know 6 bolt mains are superior to 4 bolts mains. And 4 bolt mains are superior to 2 bolt mains. Heck, anything is better than 2 bolt mains!
If this is the case, then HD might look into a 6 bolt pattern, instead of 5.
For automobile wheels, a 5 bolt wheel is 40% stronger than a 4 bolt. (According to Chrysler.)
We all know 6 bolt mains are superior to 4 bolts mains. And 4 bolt mains are superior to 2 bolt mains. Heck, anything is better than 2 bolt mains!
Last edited by NORTY FLATZ; Oct 16, 2017 at 05:24 PM.
Road Warrior
Joined: Jun 2017
Posts: 1,705
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From: Lawrenceville Ga.
I build orthopedic tools for surgeons regularly from 17-4 then heat treat for maximum strength ie: condition H900 RC 35-40
Carpenter steel handbook list any steel with 10% or more chromium as SS
I also love cars
Extreme HDF Member
Joined: Jun 2014
Posts: 11,448
Likes: 2,299
From: NW Ohio
True. Hardware store stainless is pretty weak. Suitable for buildings and non-structural but not for mission-critical, heavy machine, or powertrain.
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Road Warrior
Joined: May 2009
Posts: 1,760
Likes: 211
From: Manila, Philippines
I had read that the pulley bolts were purposely a softer grade so in the case they did back out, they would snap off and the bike would still roll instead of locking your wheel when it hits the swing arm. Key is to use locktite and replace the bolt with each use.
Not sure how true that may be.
Not sure how true that may be.
Road Warrior
Joined: Jun 2017
Posts: 1,705
Likes: 1,017
From: Lawrenceville Ga.
Sorry if this double posted....dang router!!
Correct! Most hardware are non magnetic...303 / 304 / 18-8 / maybe even 316. These do not have enough carbon / iron to heat treat for strength and hardness
Another issue even with ARP is the application correct ie: length \ diameter at head / dia at shoulder...non threaded portion / length of shoulder.
I,m adding srocket spacers and that will also be a factor.
I am going to buy from someone who states direct replacement for my application.
Then we have the whole Chinese counterfeit issue where major distributors are fooled. A lot of my jobs require full certs for any hardware or material.
Last edited by Blue Bob; Oct 16, 2017 at 07:35 PM.