Interesting Bolt (1 Viewer)

[RMD3050]

This bolt was one of four (all the same) from a running board support.
I’ve never seen one like it before and was hoping one of the resident experts might share the reason for its design, especially the ‘slot’ on the tip.

 

[rkymtnflyfisher]

That's generally a thread cutting type of bolt.

 

[RMD3050]

That's generally a thread cutting type of bolt.

Thanks! So in my case probably not where it was originally meant to be used?

 

[rkymtnflyfisher]

Thanks! So in my case probably not where it was originally meant to be used?

Probably not.


They can usually be found installed in the frame.

 

[JackA]

That's a running board support bolt. Oem

 

[65swb45]

I have several boxes of those. In my experience dismantling LCs for five decades, they were almost always used on body parts where alignment between two adjacent panels was likely to be an issue.

That said, they also showed up in some less likely places, sheetmetal-wise, but for the same reason. The bolts that hold the flanged leaf spring pins into the frame anchors is one example. And one where the exact bolt you have was used. Many folks installing replacement pins have noted that the holes often seem mismatched, and they blame the pin manufacturers.

 

[RMD3050]

Probably not.


They can usually be found installed in the frame.

Thanks.

 

[pbgbottle]

I’ve found bolts like that all over my 1978 BJ40 Canadian
I love those bolts they always thread in beautifully.

 

[charliemeyer007]

Better steel/heat treatment too. When screwing them back in I always start them by hand so they don't try and cut new threads. They can be like 100% thread contact so use some anti seize compound.
I actually enjoy cutting threads both inside and out - proper choice of lube is important.

 

[Grayscale]

Thread cleaning. When you disassemble, that groove can serve as a place for sand, rust, etc. so that the tapped hole doesn't get buggered-up with sand and rust. Either way, an oil soak is desirable, and wire brushing exposed threads is good practice before you turn it with a socket or wrench.

It looks like the flute of a tap, but taps are made from material different than a fastener (a fastener can be drilled for a screw extractpr, but a broken tap in a hole is trouble because it is harder than the drill). Is there a number on the head of that screw?

The taper on the end of that screw is like Mark's description regarding assembly alignment.

 

[RMD3050]

Thread cleaning. When you disassemble, that groove can serve as a place for sand, rust, etc. so that the tapped hole doesn't get buggered-up with sand and rust. Either way, an oil soak is desirable, and wire brushing exposed threads is good practice before you turn it with a socket or wrench.

It looks like the flute of a tap, but taps are made from material different than a fastener (a fastener can be drilled for a screw extractpr, but a broken tap in a hole is trouble because it is harder than the drill). Is there a number on the head of that screw?

The taper on the end of that screw is like Mark's description regarding assembly alignment.

Here’s a photo of the head