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View Full Version : Anyone know the name of this fastener?



winchman
01-17-2013, 05:50 PM
http://i.imgur.com/oLiV2.jpg

The closest thing I can fine is a Tri Wing, but I'm pretty sure that's not it.

http://i01.i.aliimg.com/photo/v1/124927121/TRI_WING_Flat_Head_Security_Decorative_Screws.jpg_ 220x220.jpg

sch
01-17-2013, 05:56 PM
You mean the screw with the combination Roberts (square drive) and Phillips head? Roberts Robertson?, a Canadian invention.

Bob Fisher
01-17-2013, 05:58 PM
It's a tri wing head designed to prevent tampering. You can get drivers readily from many sources, I think Mc Master Carr has them. You an buy an assortment of tools designed to get around the "tamper proof" fasteners at many big box stores. Bob.

PTSideshow
01-17-2013, 07:10 PM
Combo drive either the square drive or a reg Philips has worked for me.

oxford
01-17-2013, 08:13 PM
How can a regular phillips screwdriver work on that screw the OP posted? Every phillips I own is for 4 slots, that one has 3.

sasquatch
01-17-2013, 08:16 PM
i think the correct name for that is the "Go buy ANOTHER tool" screw.

achtanelion
01-17-2013, 08:38 PM
I believe the correct driver for that is an easy out. Replace with a proper screw.

rmuell01
01-17-2013, 08:45 PM
I need a bigger picture to be sure!:cool:

Bob Fisher
01-17-2013, 09:15 PM
MOST people do not own a three flute Phillips screwdriver, or, a square driver for that matter. I think I have a driver for any known fastener, if not I'll cobble one until I can buy the right one. The carbuerator adjusting screws on my weed whacker are good example. Designed to be "tamper proof" the average HSM can make a tool for the job. Bob.

outlawspeeder
01-17-2013, 09:21 PM
I would call it a pain in the a$$ What is it on.

PTSideshow
01-17-2013, 09:57 PM
How can a regular Phillips screwdriver work on that screw the OP posted? Every Phillips I own is for 4 slots, that one has 3.

I have had Phillips/square drive combo screws, didn't have my glasses on, they also are called Supra driveİ The 3 lobes are called Tri Wingİ and Tri Wingİ/square drive combo

rdhem2
01-17-2013, 10:33 PM
Is it supposed to be adjustable (slot screw is in) or tamper proof or both?

:confused:

Paul Alciatore
01-17-2013, 11:42 PM
It's a tri wing head designed to prevent tampering. You can get drivers readily from many sources, I think Mc Master Carr has them. You an buy an assortment of tools designed to get around the "tamper proof" fasteners at many big box stores. Bob.

So you can easily tamper with the tamper-proof fastener.

I have a set of several dozen screwdriver tips that includes almost every type of "slot" you can imagine. I believe I got it on sale from one of the machine suppliers for $3 or $4 a couple of years ago. So much for "tamper-proof".

I think you have a modified square drive. Perhaps a tri-wing driver will also work with it.

Here is a list of drive types:

http://en.wikipedia.org/wiki/List_of_screw_drives

DATo
01-18-2013, 01:15 AM
I made a set of screws once to prevent thieves from stealing my car's license plates. This had never happened to me before but I had some time on my hands and wanted to fill it with something productive in the shop.

I don't know the name of this standard screw ... it has an oversized diameter, straight-slotted head with standard threads and the head is relatively thin with steep sloping edges - sort of like the head of a carriage bolt. Anyway, I faced off the area comprising the slot, "thinning" it and turning it into more of a "pan head" screw and put two 3/32 precision placed holes on the face in place of the slot. I then made a "key" by press fitting two 3/32 dowel pins in a piece of 5/8 hex stock which could be used with a standard socket wrench. The sloping sides prevented the use of a pliers type tool as they would simply slip off if the thief tried to grip it.

Of course, if someone wants the plates badly enough they will get them. Tamper proof screws cannot totally eliminate tampering or theft but they can add a hell of a headache to a potential malcontent's day which would probably send him off to commit mischief somewhere else.

oldtiffie
01-18-2013, 01:42 AM
http://www.google.com.au/#hl=en&sugexp=les%3B&gs_rn=1&gs_ri=hp&cp=6&gs_id=o&xhr=t&q=tri+wing+screwdriver&es_nrs=true&pf=p&tbo=d&output=search&sclient=psy-ab&rlz=1W1IRFC_enAU360&oq=tri+wi&gs_l=&pbx=1&bav=on.2,or.r_gc.r_pw.r_qf.&bvm=bv.41248874,d.dGY&fp=145e449a990997f1&biw=1920&bih=818

http://en.wikipedia.org/wiki/List_of_screw_drives

Black_Moons
01-18-2013, 03:06 AM
I think you have found a 'numnut' Looks like it used to be a triwing till it got 'converted' to square, somehow...

gzig5
01-19-2013, 09:25 AM
Looks like a "drill it out and start over".

Jon Heron
01-19-2013, 09:57 AM
You can get a set of cheap driver bits for them from your local chinamen. http://www.harborfreight.com/33-piece-security-bit-set-93388.html
Cheers,
Jon