self tapping screws - Ford Transit USA Forum
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post #1 of 7 (permalink) Old 01-10-2017, 05:26:PM Thread Starter
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self tapping screws

Don't remember who posted it but someone said they attached their floor with self tapping screws. Is there a down side to doing it that way?

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post #2 of 7 (permalink) Old 01-10-2017, 05:37:PM
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Quote:
Originally Posted by BabyBuffy View Post
Don't remember who posted it but someone said they attached their floor with self tapping screws. Is there a down side to doing it that way?
No downside just make sure you know what's below.
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post #3 of 7 (permalink) Old 01-10-2017, 05:47:PM
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Any time the corrosion barrier is pierced without sealing, such as with self tapping screws, there may be a rust risk further down the road, esp in salty winter zones.

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post #4 of 7 (permalink) Old 01-10-2017, 06:22:PM
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If they will be protruding into the elements, they WILL rust. You can get stainless ones, or you can spray paint the exposed ends.

One tip, after starting the hole, back the screw out and squirt in some silicone and then tighten the screw. That should provide a seal on the inside.
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post #5 of 7 (permalink) Old 01-10-2017, 07:42:PM
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As Bill said but I have found it is better to pre-drill. Then I coat the end of the screw with silicone. The ones I have removed have all been clean after 2 years. OK, this is Washington, lots of water but not too much salt.

FYI, for the same size a stainless screw is much weaker. It varies but typically about half. Also may shear of the threads if you try to drive a stainless screw into steel, even if pre-drilled.

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post #6 of 7 (permalink) Old 01-10-2017, 07:53:PM
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also with self taping screws, they are easy to over torque in thin sheet metal, then you are left with a stripped out hole incapable of holding anything tight! Myself i used 1/4 inch carriage bolts drilled thru the subfloor and the transit floor with fender washers and acorn lock nuts underneath the floor. (a fender washer is an oversized 1/4. or 3/16 washer normally used with rivets, but work with bolts too for extra grip.)

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post #7 of 7 (permalink) Old 01-10-2017, 08:21:PM
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I did use galvanized self tapping #10 screws that are typically used for metal roofing. When pre-drilled there is no issue with stripping (unless you over torque). Unless you roll your van all the forces are in shear. I did not use fender washers and it seemed to work OK. I typically used 6" spacing for the base cabinets.

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