Self-Tapping Screw Tip for White Metal

[spits]

Greetings,
I've got a couple of old, relatively small castings of a material that I can't identify other than to categorize them as white metal--almost certainly a zinc alloy.
I'm planning to utilize self-tapping screws as I modify the castings for reassembly. My question is:
What is the ideal self-tapping screw tip configuration for this type of material? I've considered a Type BT (25), Type BF and a Type T (23), but would value inputs.

Thanks in advance.

Paul

 

[CoryPad]

I would use a modern thread rolling screw. Try Taptite from Reminc or Altracs from Ejot.

http://www.taptite.net

http://www.ejot.com

Regards,

Cory

Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.

 

[mcgyvr]

I've had very good results with these in castings
Remform "F"

http://www.taptite.com/taptite/product.asp

 

[spits]

Thanks, gents. I'll give them a look.

Paul

 

[Screwman]

I would second Cory. Taptite or Delta PT. it should be a simple application if you have enough length of engagement.