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25th Jun 2017, 07:42 PM #1
What steel are king pins made from ?
Automotive king pins: I need new king pins but with my vintage truck , they are nigh on impossible to find . From the info I have read online, king pins are machined from low carbon steel, case hardened and ground to final size . The inner core remains tough but is not brittle, similar to some automotive gears . Is this a reasonable method ?
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25th Jun 2017, 08:46 PM #2Golden Member
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Some of the ones I have seen and replaced were made from licorice. If it was a renovation and not going to do a lot of miles I would not get too fussed on using anything super special. It gives me nightmares thinking about this stuff now, doing this sort of work for a living. I think the McPherson strut was the single biggest improvement in car front ends. I can't give any material recommendations, I just felt like venting about kingpins and cars. I will get off my soapbox before I really say what I think about the junk they foisted on us as automotive technical brilliance.
CHRIS
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25th Jun 2017, 08:56 PM #3Golden Member
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EN36A would be ideal. It is readily available from Bohler.
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25th Jun 2017, 09:03 PM #4Diamond Member
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25th Jun 2017, 09:04 PM #5Most Valued Member
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Hi MM, found this on Google, which led me to the PM website.
The material should be machined steel AISI 8630H hardened to 302-363 BHN
I've made kingpins from EN 36b, which is sae 3310 iirc. Case hardened and ground.
4340 52 RC Critical that tooling marks are polished out to eliminate stress risers.
Is there a manufactured kingpin that is close that could be used, either bushes made to suit or ground down to fit???
Hope this helps,
KrynTo grow old is mandatory, growing up is optional.
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25th Jun 2017, 10:55 PM #6
pins
The problem with grinding down a larger diameter pin is: there is a machined flat on each king pin , this flat is for the locking tapered pin . In my case the machined flat is not half way , it is off centre . There are also machined grooves for grease . EN36, sounds like it will do the job thanks .
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25th Jun 2017, 11:33 PM #7Diamond Member
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If you are making vintage vehicle kingpins from EN36A do they still need to be hardened and ground? If so, how much oversize should they be when they go to the heat treater? I'm thinking 3/4" diameter pins.
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25th Jun 2017, 11:45 PM #8
If the EN36 was not hardened and ground they would not last very long , they would be too soft I would think and wearing scoring marks would appear . The bushes are normally bronze . Not sure about the oversize allowance for the grinding . My pins are just over .9" Maybe .010" oversize ?
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26th Jun 2017, 08:19 AM #9Diamond Member
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10 thou over is good. More than that takes too long to grind off. I would get them case hardened 20 thou deep.
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26th Jun 2017, 08:28 AM #10Philomath in training
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It's individual preference of course, but when looking at using/ making a replacement part that is used in a situation that is safety (or even function) critical I always try to make it so that the part does not become an unknown weakness. As an example, when I set up my grinders, even though they are 3 phase from a VFD, I set pulley ratios so that if the VFD was removed by a future owner in say in 50 years time the wheels will not run over speed.
In this case while it may be tempting to not harden and grind the pins (or even use a less suitable material), it has potential safety impacts. While Morrisman may know that the pins were soft and needed to be checked every say 500 km, or know not to get airborne in the vehicle because the landing shock is too much, a future owner or even someone else driving the vehicle on loan may not. Any replacement part needs to be reliable enough that the vehicle can be used in the usual situations with confidence.
Michael
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26th Jun 2017, 10:52 AM #11Diamond Member
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26th Jun 2017, 06:18 PM #12Pink 10EE owner
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If the truck was designed and made in the 1940's then they would not have had the alloys we have today thus the truck would have been designed and built with only what was available at the time and to a price. I think 4140 was cutting edge back in that era.
Gold, the colour of choice for the discerning person.
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26th Jun 2017, 07:45 PM #13Diamond Member
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26th Jun 2017, 08:55 PM #14Golden Member
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The volume of a pizza of thickness 'a' and radius 'z' is given by pi z z a.
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29th Jun 2017, 05:19 PM #15Senior Member
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hi morrisman
you could try aa bearings nunawading 98741660
they sell hardened shafting for king pins and gearbox lay-shafts in various sizes for vintage vehicles.
ask for Adrian say damien gave you the number cheers
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