Strut Top Mount Serration Fastener
Strut Top Mount Serration Fastener
(OP)
Hi All,
I'm helping a small local tuning company develop some aftermarket strut top mounts for a european (UK) car. They are very similar to aftermarket ones by Tein, HKS, etc. as shown below.

I'm looking for a supplier for the serration bolts (If that is what they're called) that can be pressed into the mount to allow it to be bolted to the chassis. I've done a lot of searching on the internet but haven't came up with any suppliers names apart from Boesner in Germany. The serration bolts in the stock mounts are M8x1.25 with a ~16mm thread length. The flat head is ~15mm diameter and 2.5mm thick. Ideally I'd like a supplier in the UK. I also have a couple of questions regarding these fasteners...
1. What is the proper name for these fasteners and do they have a related standard for their design?
2. Are these generally made to suit the OEM, there are no "stock" sizes?
Hope you guys can help,
Stef
I'm helping a small local tuning company develop some aftermarket strut top mounts for a european (UK) car. They are very similar to aftermarket ones by Tein, HKS, etc. as shown below.

I'm looking for a supplier for the serration bolts (If that is what they're called) that can be pressed into the mount to allow it to be bolted to the chassis. I've done a lot of searching on the internet but haven't came up with any suppliers names apart from Boesner in Germany. The serration bolts in the stock mounts are M8x1.25 with a ~16mm thread length. The flat head is ~15mm diameter and 2.5mm thick. Ideally I'd like a supplier in the UK. I also have a couple of questions regarding these fasteners...
1. What is the proper name for these fasteners and do they have a related standard for their design?
2. Are these generally made to suit the OEM, there are no "stock" sizes?
Hope you guys can help,
Stef





RE: Strut Top Mount Serration Fastener
The feature is called by different names, such as serrations or splines.
ANY manufacturer of automotive fasteners could make these parts. Boesner is part of Textron Fastening Systems, the world's largest fastener supplier. Other large European fastener suppliers include Kamax and Nedschroef.
Regards,
Cory
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.
RE: Strut Top Mount Serration Fastener
Thanks again,
Stef
RE: Strut Top Mount Serration Fastener
"press-in captive studs"
"weld studs"
"captive nuts"
"bolt retainers"
"push nuts"
"speed nuts"
If they were 12 mm I'd be looking at wheel lug bolts to steal.
The LOCTITE gang might have a retaining compound that was useful.
RE: Strut Top Mount Serration Fastener
Cheers
Greg Locock
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips.
RE: Strut Top Mount Serration Fastener
Typical reasons not to for applications like this include:
1) desire for high strength steels (fastener and mating components) that are not fusion-weldable without post weld heat treatment
2) desire for some disassembly/reusability of the joint members
Regards,
Cory
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.