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Bolt grade for side steps
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James028
 


Member Since: 16 Mar 2020
Location: Borders
Posts: 86
Bolt grade for side steps

I am fitting some shire fabrications sliders. Based on posts on the forum I am painting with raptor first. I am also thinking of swapping to stainless bolts. Has anyone done this? I can only find A2 stainless bolts which I do not think are as strong as the 10.9 Grade bolts which came with the sliders. Thoughts appreciated.  
Post #219608924th Dec 2020 5:02 pm
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pagoda
 


Member Since: 13 Aug 2009
Location: Not London Anymore (or the US for that matter)
Posts: 1923

Canada 2016 LR4 3.0 SDV6 Landmark LE Auto Yulong WhiteLR4

I'm fitting my sliders over Christmas, also. In an effort to reduce metal on metal erosion I painted the inside of them (the mating surface) with truck bed liner and I'm going to make some thin plastic washers to sit inbetween the steps and sills. 10,9 bolts are strong; I suppose you risk sheering if you go softer. Use copper paste on the bolts and you should be OK with the ones they provided. One piece of advice I picked up off another member is to use a tap on the threads in the sills. I'm also going wash out my sills and apply cavity wax before fitting (the PO liked to drive the vehicle on the beach Rolling Eyes ) PAGODA  
Post #219609324th Dec 2020 5:12 pm
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rrhool
 


Member Since: 28 Aug 2014
Location: Norfolk
Posts: 4400

United Kingdom 2007 Discovery 3 TDV6 SE Manual Zermatt SilverDiscovery 3

A2 are nowhere near a 10.9

A4 are better if you want to use stainless.

What sizes are you after? Richard


D3 SE 2007. Triumph 2.5Pi 1973. Ferguson TEA20 1948.



Discovery 2 4.0 ES 2001- Gone
Discovery 1 300Tdi ES '95 - Gone
Range Rover Classic '79 - Gone  
Post #219609924th Dec 2020 5:32 pm
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lynalldiscovery
 


Member Since: 22 Dec 2009
Location: Maidstone
Posts: 7274

United Kingdom 2006 Discovery 3 TDV6 Metropolis LE Auto Bonatti GreyDiscovery 3

10.9 are pretty manly bolt wise, 8.8 are pretty much what I would expect on side steps etc, 4.4 are way weaker but will still do the job.  
Post #219611024th Dec 2020 5:54 pm
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James028
 


Member Since: 16 Mar 2020
Location: Borders
Posts: 86

Pagoda do you not think your plastic washers will create a gap for water to sit in? I was thinking of fitting some door rubber seal at the top to keep out the muck.

I think they are m8 But maybe the 10.9 is overkill?  
Post #219611524th Dec 2020 6:11 pm
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pagoda
 


Member Since: 13 Aug 2009
Location: Not London Anymore (or the US for that matter)
Posts: 1923

Canada 2016 LR4 3.0 SDV6 Landmark LE Auto Yulong WhiteLR4

For the plastic I'm going to use something very thin indeed. I'm eyeing up a soda water bottle at the moment and may cut them from that. Judging by the ones I find on the beach they should outlast the LR. I don't think something maybe .5-.75MM will interfere with the steps. I don't expect them to fit perfectly plus the door covers them most of the time. I did think about running a thin silicone bead along the top to keep the water out but have decided against it as it'll probably keep the water in. 10,9 would be overkill. 8,8 would be fine IMO. PAGODA  
Post #219612224th Dec 2020 6:32 pm
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SteveKK
 


Member Since: 11 Apr 2019
Location: North Herefordshire
Posts: 255

Ukraine 2010 Discovery 4 3.0 SDV6 HSE Auto Buckingham BlueDiscovery 4

If you decide to go with stainless then I can recommend Kay's Fasteners on eBay. I've used them for years for my stainless bolts etc. They have A4 M8s.

https://www.ebay.co.uk/itm/HEXAGON-HEAD-SE...890.l49292

I believe A4 grade stainless are somewhere between 8.8 and 10.8.

Regards,
Steve  
Post #219612924th Dec 2020 6:49 pm
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James028
 


Member Since: 16 Mar 2020
Location: Borders
Posts: 86

Pagoda good point there is little as indestructible as a plastic bottle.

SteveKK thanks for the recommendation- I’ll check them out  
Post #219640926th Dec 2020 6:06 pm
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