Rear suspension bolts RYP100150 - Page 3

T-Cut · 27th May 2013, 11:35

That simplifies it a lot, thanks.
Wiki doesn't help much other than illustrating why I asked: http://en.wikipedia.org/wiki/Screw

TC

steve811 · 27th May 2013, 12:41

They are flanged head bolts. Given the softness of the head I would be surprised if the bolt is that hard, but it could have been induction hardened. They are 60mm including the head (I know I should have measured the threaded portion), and as you can see, a good 5mm is non-loaded.

steve811 · 27th May 2013, 12:42

Sorry, should have uploaded the photo!

Froggy-Mk2 · 27th May 2013, 13:03

The end of that screw has been specially machined, I wonder why ?

Looks part bleed nipple part self tapper - weird, especially at M12. What function is that conical end performing I wonder.

MrDoodles · 27th May 2013, 13:16

Quote:

Originally Posted by Froggy-Mk2

The end of that screw has been specially machined, I wonder why ?

Looks part bleed nipple part self tapper - weird, especially at M12. What function is that conical end performing I wonder.

Looks like it's designed to also locate the part as well as hold it and the end of the bolt is designed to locate properly, to minimise any cross-threading!

Froggy-Mk2 · 27th May 2013, 13:39

Quote:

Originally Posted by MrDoodles

Looks like it's designed to also locate the part as well as hold it and the end of the bolt is designed to locate properly, to minimise any cross-threading!

That makes sense, but then it would mean this is a special screw, not an off-the-shelf

MrDoodles · 27th May 2013, 13:45

Quote:

Originally Posted by Froggy-Mk2

That makes sense, but then it would mean this is a special screw, not an off-the-shelf

Correct!

I'm on the phone at the moment, have you looked on the Rimmers site for availability?

Froggy-Mk2 · 27th May 2013, 14:30

Rimmers NLA, Brown and Gammon NLA, X-Part 1 off - and thats all the google results pull up with that part number

I have also found a posting from another forum that shows them NLA in May 2006, and they confirm its M12 fine thread too.
Its starting to look like a special run off from a machine shop

steve811 · 27th May 2013, 15:15

If you can find a machine shop that will happily work with 12.9 grade bolts! Although there is no stamping on the head of these so it is possible (unlikely) that these are "normal" steel. I think the end of the thread is designed to clean out the threads as they are removed, like a tap. I doubt if it gives any physical properties to the bolt. Interestingly Rover only recommend a torque load of 100Nm which is not a lot, given the stresses on these bolts. Just going from 8.8 to 12.9 bolts gives a 30% increase in strength, but I just wonder how much stress these bolts need to take?

milford man · 27th May 2013, 15:39

Hi, I would use these with a suitable washer https://www.spaldingfasteners.co.uk/...olts-grade-129

Regards John

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27th May 2013, 11:35	#21
T-Cut This is my second home Rover75 and Mreg Corsa. Join Date: Nov 2006 Location: Sumweer onat mote o'dust (Sagin) Posts: 20,613 Thanks: 258 Thanked 3,069 Times in 2,508 Posts	That simplifies it a lot, thanks. Wiki doesn't help much other than illustrating why I asked: http://en.wikipedia.org/wiki/Screw TC

27th May 2013, 12:41	#22
steve811 Banned Rover 75 Tourer CDT Connoisseur SE Join Date: Dec 2010 Location: Newport Posts: 1,912 Thanks: 107 Thanked 299 Times in 206 Posts	They are flanged head bolts. Given the softness of the head I would be surprised if the bolt is that hard, but it could have been induction hardened. They are 60mm including the head (I know I should have measured the threaded portion), and as you can see, a good 5mm is non-loaded.

27th May 2013, 12:42	#23
steve811 Banned Rover 75 Tourer CDT Connoisseur SE Join Date: Dec 2010 Location: Newport Posts: 1,912 Thanks: 107 Thanked 299 Times in 206 Posts	Sorry, should have uploaded the photo!

27th May 2013, 13:03	#24
Froggy-Mk2 Loves to post 75 Contemporary SE Mk II 2004 Auto. Sal. CDTi Join Date: Nov 2010 Location: Fareham Posts: 368 Thanks: 0 Thanked 0 Times in 0 Posts	The end of that screw has been specially machined, I wonder why ? Looks part bleed nipple part self tapper - weird, especially at M12. What function is that conical end performing I wonder.

27th May 2013, 14:30	#28
Froggy-Mk2 Loves to post 75 Contemporary SE Mk II 2004 Auto. Sal. CDTi Join Date: Nov 2010 Location: Fareham Posts: 368 Thanks: 0 Thanked 0 Times in 0 Posts	Rimmers NLA, Brown and Gammon NLA, X-Part 1 off - and thats all the google results pull up with that part number I have also found a posting from another forum that shows them NLA in May 2006, and they confirm its M12 fine thread too. Its starting to look like a special run off from a machine shop

27th May 2013, 15:15	#29
steve811 Banned Rover 75 Tourer CDT Connoisseur SE Join Date: Dec 2010 Location: Newport Posts: 1,912 Thanks: 107 Thanked 299 Times in 206 Posts	If you can find a machine shop that will happily work with 12.9 grade bolts! Although there is no stamping on the head of these so it is possible (unlikely) that these are "normal" steel. I think the end of the thread is designed to clean out the threads as they are removed, like a tap. I doubt if it gives any physical properties to the bolt. Interestingly Rover only recommend a torque load of 100Nm which is not a lot, given the stresses on these bolts. Just going from 8.8 to 12.9 bolts gives a 30% increase in strength, but I just wonder how much stress these bolts need to take?

27th May 2013, 15:39	#30
milford man Gets stuck in Jaguar XE Prestige Join Date: Oct 2010 Location: Coventry Posts: 536 Thanks: 156 Thanked 107 Times in 99 Posts	Hi, I would use these with a suitable washer https://www.spaldingfasteners.co.uk/...olts-grade-129 Regards John