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#37413 04/27/04 11:02 PM
Joined: Dec 2003
Posts: 524
...I once bought a box of 10-32 x 1" self-tapping/drilling, hex head,stainless steel screws..tho' Ive been told they don't make such an animal.I've searched everywhere,and the only thing I can come up with is a "thread-cutting" screw..with that,ya gotta drill a pilot hole first,then thread in your screw in..With the other,ya just drill it in with your 5/16 hex-bit,and you're done..I know I'm not cracking up..(yet)...has anyone seen,or used this kind of screw..?
I use them for bonding ground lugs on FS boxes,and swimming pool ladders,structural members etc..I then attach a 10-32 nut,and cinch it up real tight,to make a good bond...

.."if it ain't fixed,don't break a Licensed Electrician"
#37414 04/27/04 11:48 PM
Joined: Apr 2002
Posts: 2,527
AR — In a pinch, McMaster-Carr is a fairly decent industrial-hardware house.;desc=Thread%2DCutting+Pan+Head+Screws

#37415 04/28/04 12:04 AM
Joined: Jun 2003
Posts: 1,143
MCMaster Carr is the BOMB, baby!

They may not have the lowest prices, but if you need a left handed wire twist remover, they'll have it!

#37416 04/28/04 12:36 AM
Joined: Jul 2003
Posts: 394
As soon as anybody says stainless, the first thing that comes to mind is aircraft supply houses. I do some restoration on older vehicles and I have a place that has 5/32 stainless steel closed-end flat head pop rivets on the shelf. Try and find them in a hardware store. Check you local phone book.

#37417 04/28/04 08:43 AM
Joined: Sep 2001
Posts: 806
McMaster-Carr part number:

90106A219--unslotted hex head, SS #10 x 1" self drilling screw.

The "10-32" requirement may be what is killing you. I have never seen a self drilling machine screw, only the thread forming type. Self drillers are generally a sheet metal screw type of thread. If you need a 10-32 machine screw thread, thread formers would be the way to go.

[This message has been edited by NJwirenut (edited 04-28-2004).]

#37418 04/28/04 05:43 PM
Joined: Feb 2004
Posts: 62
I can't find the code reference at the moment, but a self-drilling (tek) screw is not allowed to be used to attach a ground lug. The hole must be drilled and tapped.

#37419 04/28/04 05:59 PM
Joined: Jan 2003
Posts: 4,391
There are Tek screws available with machine threads instead of typical sheet metal threads.

These Teks with machine threads are not prohibited for grounding use.

Here is the code that prohibits sheet metal screws.

250.8 Connection of Grounding and Bonding Equipment.
Grounding conductors and bonding jumpers shall be connected by exothermic welding, listed pressure connectors, listed clamps, or other listed means. Connection devices or fittings that depend solely on solder shall not be used. Sheet metal screws shall not be used to connect grounding conductors to enclosures.

Here is a picture of a Tek screw with true machine threads.

[Linked Image from]

[This message has been edited by iwire (edited 04-28-2004).]

Bob Badger
Construction & Maintenance Electrician
#37420 04/28/04 06:50 PM
Joined: Dec 2002
Posts: 228
Mcmaster is one of those places I would like to run free like a kid in a candy store, and seeing as how I can look out my front door and almost see them, only about 200' down the road, maybe they will let me... or I can wait till it gets dark... Find my bfh.... [Linked Image]

#37421 04/28/04 08:02 PM
Joined: Dec 2001
Posts: 300
I've had a couple of emergencies where I needed something really weird right now! I've called mcmaster and picked up at the plant. Thousands of feet of conveyor belts all criss-crossing each other as boxes are being automatically bumped from one conveyor to the next.

They didn't let me play with anything.

#37422 04/29/04 03:20 AM
Joined: Feb 2004
Posts: 1,438
Id NEVER heard of this place!!!!

A supply house open on Saturdays!?!? in LA!
My boss is gonna have an account for us there yesterday! [Linked Image]


I spent 3 hours trying to find these for a deli owner with $27K worth of "Boarshead" meat in a walk in cooler on a dead panel! at 2pm on a Saturday(feeder was loose, arced the back of the panel, put everything back together... "where's the breaker?".. "what breaker?" "for the panel?" "Oh, you mean the fuses?".. "ummmmm..."

[Linked Image from]

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