Thread type specified on typical american automotive battery hold down bolt

[ColonelMonk]

Howdy All:

I'm designing a battery hold down for a battery pack of 8 golf cart batteries in our product.

There is a thread used by some automotive companies for bolts thru battery hold-down "wedges" that is progressive in nature. The threaded end of the bolt is pointed or tapered, and the threads on the tip, while they have the same pitch, are not fully formed. They help to easily center and start a long bolt in an area which is difficult to see where the bolt hole is!

They aren't tapered per se, at least as compared with SAE tapered thread or pipe thread. Further, they have a fairly low thread pitch to speed assembly.

I have searched plenty for a spec, but I can't find what I'm looking for! Does anyone out there know what this is?

Thanks,

CM

 

[mcgyvr]

dog point or die point ?

 

[MintJulep]

I think it is a "Type AB Self-tapping thread".

http://www.fastenersuperstore.com/p...tted-Hex-Washer-Head-Type-AB-Steel-Black-Zinc

 

[CoryPad]

Can you find it on this page?

http://www.eaglefastener.net/technical/screw-point-styles.html

 

[TenPenny]

Have a look here, I expect you are referring to dog point, perhaps a Type C, but this should help point you in the direction

http://www.eaglefastener.net/technical/screw-point-styles.html

 

[ColonelMonk]

Hey, thanks everyone! I'm not that I've seen the one I'm thinking about, but I have definitely seen the dog point type in some vehicles. Since it has a name and a type it's likely the best for my needs.

Thanks a lot!

 

[racookpe1978]

Now remember, for you to use the idea (by specifying a rod type, thread type, rod tip machining (like a cone for example)) does not mean you need a government-officially-approved thread name. Make two or three asa prototype. Test it.

If it works in testing, use it.