This site is not affiliated with AGCO Inc., Duluth GA., Allis-Chalmers Co., Milwaukee, WI., or any surviving or related corporate entity. All trademarks remain the property of their respective owners. All information presented herein should be considered the result of an un-moderated public forum with no responsibility for its accuracy or usability assumed by the users and sponsors of this site or any corporate entity. | ||||||
The Forum | Parts and Services | Unofficial Allis Store | Tractor Shows | Serial Numbers | History |
Self tapping screws, |
Post Reply |
Author | |
DougG
Orange Level Joined: 20 Sep 2009 Location: Mo Points: 7946 |
Post Options
Thanks(0)
Posted: 01 Aug 2021 at 1:38pm |
This is a peeve of mine - how many do you have to try to get one to take hold ? Ive done all kinds , stainless , just reguluar supposed to be the latest and greatest- and will not even go thru 29 gauge metal- call the supplier, yeah keep track on all you cant use --- grrrrr aggrivating
|
|
Sponsored Links | |
DMiller
Orange Level Access Joined: 14 Sep 2009 Location: Hermann, Mo Points: 29663 |
Post Options
Thanks(0)
|
Hole has to be shank of screw diameter, cannot be too small or too large otherwise burns off screw threads or strips hole.
|
|
DougG
Orange Level Joined: 20 Sep 2009 Location: Mo Points: 7946 |
Post Options
Thanks(0)
|
But they are supposed to be self tapping! No pilot hole needed, says the paperwork in the box!
|
|
DMiller
Orange Level Access Joined: 14 Sep 2009 Location: Hermann, Mo Points: 29663 |
Post Options
Thanks(0)
|
Self drilling heads?
|
|
Trawler II
Orange Level Access Joined: 04 Jul 2017 Location: Missouri Points: 3307 |
Post Options
Thanks(0)
|
You must mean self drilling, as the name suggests they drill their own pilot hole. There are different grades of self drillers depending on gauge or thickness of metal. The difference is significant. TEK screws of one grade will drill and fasten light gauge sheet metal no problem. Try using the same grade on 1/8” -1/4” steel and they will snap. You may need to upgrade the screws you are trying to use, maybe check with Fastenal or another supplier.
|
|
jaybmiller
Orange Level Access Joined: 12 Sep 2009 Location: Greensville,Ont Points: 21565 |
Post Options
Thanks(0)
|
the biggest issue I have is seeing guys NOT letting up on the drill speed ,once the hole is made , and then spin 10,000 rpm, and destroy the metal. Usually see this when HVAC ducts are being 'secured'. Also ZERO need to use an impact to drive them.
|
|
3 D-14s,A-C forklift, B-112
Kubota BX23S lil' TOOT( The Other Orange Tractor) Never burn your bridges, unless you can walk on water |
|
DougG
Orange Level Joined: 20 Sep 2009 Location: Mo Points: 7946 |
Post Options
Thanks(0)
|
Yes self drilling is what I meant - they have the drill bit sides on the screw- the ones in this kit are just aggrivating!
|
|
FREEDGUY
Orange Level Access Joined: 15 Apr 2017 Location: South West Mich Points: 5391 |
Post Options
Thanks(0)
|
Where did the term "self tapping" come from ? Even I've been corrected about them being "self drilling after I called them "tappers" .
|
|
Ray54
Orange Level Access Joined: 22 Nov 2009 Location: Paso Robles, Ca Points: 4370 |
Post Options
Thanks(0)
|
From screws that make real threads in sheet metal. Use a search engine and look at what they show you can see the different type screws. The self drilling have flutes like a drill bit, the self tapping are pointed with thread starting in the point. Some real information on the net if you look for it. Now my question for the world of auto building. There are pointed cap screws used in auto body panels. Generally the panel has square much like nut welded to the panel. Do those bolts cut the threads as they are screwed in or are there threads in the nut looking things. The point is a real help in putting things back when you don't have guys to hold panel in place as put screws in. As my mini search did not find any of those hex headed screws under self tapping.
|
|
Jim.ME
Orange Level Joined: 19 Nov 2016 Location: Maine Points: 937 |
Post Options
Thanks(0)
|
There are self tapping screws. 5/16-18 with T40 countersunk heads are commonly used to secure wood decks on trailers. Tips are tapered about like a tap and the first few tapered threads are the tap. Lay the deck board, drill through the deck board and cross member with a tap drill, then drive the screw.
Edited by Jim.ME - 01 Aug 2021 at 8:53pm |
|
Dusty MI
Orange Level Joined: 13 Sep 2009 Location: Charlotte, Mi Points: 5053 |
Post Options
Thanks(0)
|
I've done furnace install work, have a sheet metal shop, make my own duct. I have/use self pursing screws, and self drilling screws for heaver sheet metal. Yes need to turn screw slow to keep from striping.
Piercing. Edited by Dusty MI - 02 Aug 2021 at 7:13pm |
|
917 H, '48 G, '65 D-10 series III "Allis Express"
|
|
FREEDGUY
Orange Level Access Joined: 15 Apr 2017 Location: South West Mich Points: 5391 |
Post Options
Thanks(0)
|
It's also been "my" experience that using a 1/4" impact driver is NOT the tool of choice for these types of fasteners !!
|
|
WF owner
Orange Level Joined: 12 May 2013 Location: Bombay NY Points: 4419 |
Post Options
Thanks(0)
|
I find that, like almost everything, self tapping (or drilling or piercing) screws come in a variety of quality.
I bought a variety pack from Harbor Freight, that I carry in our RV. It gives me a selection, but they aren't very good quality. The ones I used to get from Fastenal or Grainger for my work crew, were much better quality (drilled better, stripped less and broke off less). I (and my crew) used 1/4" impact drivers to install self drilling screws for years. I believe, as with any metal drill, that drilling them at a slower speed works much better. If you don't have a variable speed impact driver, you may not have that option, but, personally, I wouldn't buy an impact driver that isn't variable speed.
|
|
DiyDave
Orange Level Access Joined: 11 Sep 2009 Location: Gambrills, MD Points: 50632 |
Post Options
Thanks(0)
|
Something in this thread reminded me of this old Buffett song:
Edited by DiyDave - 03 Aug 2021 at 6:42pm |
|
Source: Babylon Bee. Sponsored by BRAWNDO, its got what you need!
|
|
HD6GTOM
Orange Level Joined: 30 Nov 2009 Location: MADISON CO IA Points: 6627 |
Post Options
Thanks(0)
|
I bought some at H.F. years ago. Any more I get them from our local hardware store. They arn't that much more expensive but sure are better quality
|
|
Post Reply | |
Tweet
|
Forum Jump | Forum Permissions You cannot post new topics in this forum You cannot reply to topics in this forum You cannot delete your posts in this forum You cannot edit your posts in this forum You cannot create polls in this forum You cannot vote in polls in this forum |