Self-Tapping Screw VS Self-Drilling Screw

26 Mar.,2024

 

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Self-Tapping Screw VS Self-Drilling Screw

Self-Tapping Screw VS Self-Drilling Screw

Joanne Eng

(Bioengineer)

(OP)

24 Jul 23 07:07

what is the difference between a self-tapping screw and a self-drilling screw?

what is the difference between a self-tapping screw and a self-drilling screw?

RE: Self-Tapping Screw VS Self-Drilling Screw

RedSnake

(Electrical)

24 Jul 23 08:12

A self drilling screw has a end that works as a drill which are supposed to not make the wood split, which can happen if you use a self tapping screw and don't pre drill a hole first.

A self drilling screw has a end that works as a drill which are supposed to not make the wood split, which can happen if you use a self tapping screw and don't pre drill a hole first.

NAFO Sergeant Anna Gr 69th Sniffing Brigade

RE: Self-Tapping Screw VS Self-Drilling Screw

1503-44

(Petroleum)

24 Jul 23 09:00

I only use those for metal. The left screw does not require a predilled hole. Drill length should be sufficient for the thickness of the embedding plate. Right screw may work for very thin sheet without pre drilling, but will likely not penetrate a thick sheet sufficiently to pull itself in. It may also require a lot of push to get it going and may overtorque and shear half way into a thicker sheet. Both will "thread" the hole.

--Einstein gave the same test to students every year. When asked why he would do something like that, "Because the answers had changed."

RE: Self-Tapping Screw VS Self-Drilling Screw

MintJulep

(Mechanical)

24 Jul 23 09:04

Just as the names state.

A self tapping screw will will make its own threads when driven.

A self drilling screw will drill its own hole, then make its own threads.

RE: Self-Tapping Screw VS Self-Drilling Screw

RedSnake

(Electrical)

24 Jul 23 09:29
There are versions for wood too.

Yes you are right 1503-44, I didn't pay attention, those in the picture are metal screws, but as MintJulep says the basic principle is the same.There are versions for wood too.

NAFO Sergeant Anna Gr 69th Sniffing Brigade

RE: Self-Tapping Screw VS Self-Drilling Screw

waross

(Electrical)

24 Jul 23 17:38

Welcome to the Hobbies forum. Engineering Edge.

--------------------
Ohm's law
Not just a good idea;
It's the LAW!

RE: Self-Tapping Screw VS Self-Drilling Screw

Joanne Eng

(Bioengineer)

(OP)

25 Jul 23 05:53

Any specific self-drilling or self-tapping drills brand you recommend?

RE: Self-Tapping Screw VS Self-Drilling Screw

ctopher

(Mechanical)

25 Jul 23 17:22

If the screws are for a DIY project, any will do. If critical for work project, use MS/MIL spec screws. I think most brands will do.

Chris, CSWP
SolidWorks
ctophers home

RE: Self-Tapping Screw VS Self-Drilling Screw

TugboatEng

(Marine/Ocean)

25 Jul 23 18:04

The problem with self-drilling and Self-Tapping Screws is that they have to be hard which eliminates highly corrosion resistant alloys. You're stuck with alloys like 410SS which have poor corrosion resistance hence the need for a high performance coating system.

The coated fasteners are less likely to cause trouble in dissimilar metal combinations when the faster is more noble than the structure.

https://allpointsfasteners.com/stainless-dacromet-...

One thing to keep in mind is that MS/MIL are slow moving standards. The inorganic type coatings are relatively new and are not as likely to be found in MS/MIL.The problem with self-drilling and self-tapping screws is that they have to be hard which eliminates highly corrosion resistant alloys. You're stuck with alloys like 410SS which have poor corrosion resistance hence the need for a high performance coating system.The coated fasteners are less likely to cause trouble in dissimilar metal combinations when the faster is more noble than the structure.

RE: Self-Tapping Screw VS Self-Drilling Screw

Alistair_Heaton

(Mechanical)

26 Jul 23 16:57

https://en.foerch.com/din-and-standard-parts

Also this one

https://www.ejot.com/Building-Fasteners/Products/S...

https://www.ejot.com/Building-Fasteners/Products/S...

I use this brand a lot in europe.Also this one

RE: Self-Tapping Screw VS Self-Drilling Screw

Joanne Eng

(Bioengineer)

(OP)

27 Jul 23 03:36

Hi all,

thank you so much for your amazing insights! i will definitely check out the fasteners you've recommended me.

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