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03-02-2020, 09:40
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#16
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Registered User
Join Date: Feb 2018
Location: In the air or on the water
Boat: Southern Cross 39
Posts: 207
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Re: Robertson vs Phillips headed screws
Or grabbing a Reed & Prince driver for a Phillips fastener 
Quote:
Originally Posted by slug
And many of those fasteners that look like philips and not
They are pozidriv
Be alert
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03-02-2020, 09:41
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#17
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Registered User
Join Date: Nov 2019
Posts: 1,642
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Re: Robertson vs Phillips headed screws
Quote:
Originally Posted by ttex
The type of screw head determines the amount torque that can be applied to the screw. At least that is what I was told by my elders. If it is wrong its their fault.
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Also application
Flat head screws. Are superior in application which paint over or fill in the screw head
It’s almost impossible to clean out the head of a Phillips or hex head
You can also developer tremendous torque on a flat head
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03-02-2020, 09:53
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#18
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Registered User
Join Date: Sep 2017
Posts: 1,075
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Re: Robertson vs Phillips headed screws
One disadvantage for Robertson involves the lack of an over-torque relief.
One advantage for Robertson involves the lack of an over-torque relief.
That's just my experience. Eh.
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03-02-2020, 10:09
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#19
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Registered User
Join Date: Feb 2013
Location: WY / Currently in Hayes VA on the Chesapeake
Boat: Ocean Alexander, Ocean 44
Posts: 1,149
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Re: Robertson vs Phillips headed screws
I think that the slot heads were the original because the slot was easy to cut and a blade driver required low tooling/skill to produce. Imagine trying to create a philips or torx driver with a forge and a hammer.
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03-02-2020, 10:10
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#20
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Registered User

Join Date: May 2011
Location: Miami Florida
Boat: Ellis Flybridge 28
Posts: 4,078
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Re: Robertson vs Phillips headed screws
Quote:
Originally Posted by slug
Also application
Flat head screws. Are superior in application which paint over or fill in the screw head
It’s almost impossible to clean out the head of a Phillips or hex head
You can also developer tremendous torque on a flat head
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Slug, I think you’re using “flat head” when you mean slotted. A flat head screw can be Phillips, Slotted or any of the other type of drives.
__________________
Retired from Hopkins-Carter Marine Supplies
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03-02-2020, 11:50
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#21
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Registered User
Join Date: Nov 2019
Posts: 1,642
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Re: Robertson vs Phillips headed screws
Quote:
Originally Posted by HopCar
Slug, I think you’re using “flat head” when you mean slotted. A flat head screw can be Phillips, Slotted or any of the other type of drives.
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Oops
Slot head
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03-02-2020, 11:52
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#22
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Registered User
Join Date: Nov 2019
Posts: 1,642
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Re: Robertson vs Phillips headed screws
And countersunk slot head should never be used in wet, water intrusion environment
Very difficult to water proof the countersunk head of a slot
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03-02-2020, 12:03
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#23
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Registered User
Join Date: May 2011
Location: Lake Ont
Posts: 8,582
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Re: Robertson vs Phillips headed screws
Quote:
Originally Posted by cyan
One disadvantage for Robertson involves the lack of an over-torque relief.
One advantage for Robertson involves the lack of an over-torque relief.
That's just my experience. Eh.
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Just about any decent drill has a clutch setting for limiting the torque. An experienced human wrist can also sense torque.
Any fastener design which relies on the threshold of damage to the screw-head or driver-bit to limit torque is arguably inferior.
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03-02-2020, 12:39
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#24
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Registered User
Join Date: Feb 2013
Location: WY / Currently in Hayes VA on the Chesapeake
Boat: Ocean Alexander, Ocean 44
Posts: 1,149
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Re: Robertson vs Phillips headed screws
Quote:
Originally Posted by Lake-Effect
Just about any decent drill has a clutch setting for limiting the torque. An experienced human wrist can also sense torque.
Any fastener design which relies on the threshold of damage to the screw-head or driver-bit to limit torque is arguably inferior. 
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Hear! Hear!!
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03-02-2020, 13:13
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#25
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Registered User
Join Date: Nov 2013
Location: Slidell, La.
Boat: Morgan Classic 33
Posts: 2,845
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Re: Robertson vs Phillips headed screws
Robertson/square vs philips/posidrive etc. are similar enough in drive characteristics to be a wash.
After driving literally hundreds, if not thousands, of pounds of screws over 45 years, if available I use torx when and wherever possible. And they're getting more and more available, even in stainless, which says a lot for their efficacy...
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03-02-2020, 13:27
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#26
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Moderator
Join Date: May 2008
Location: cruising SW Pacific
Boat: Jon Sayer 1-off 46 ft fract rig sloop strip plank in W Red Cedar
Posts: 21,572
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Re: Robertson vs Phillips headed screws
Interesting presentation of material that I was generally familiar with, and some of t he historical graphics were nice touches. Thanks for posting it!
I was somewhat surprised that neither the presenter nor folks upthread have mentioned my favorite: Allen or socket head screws. They have been around for a long time and have some advantages over Robertson IMO, mostly their ability to be stuck on the end of a driver and waved around whilst approaching their destination without coming off.
I've not used many Torx screws, and have never seen them in larger sizes, but they look very promising to me, with less tendency to strip out when overloaded than the Allen head.
And finally, I've often cursed the similarity between Phillips and Pozi-drive... I still can't tell them apart visually.
Jim
__________________
Jim and Ann s/v Insatiable II, lying Port Cygnet Tasmania once again.
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03-02-2020, 14:01
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#27
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Registered User
Join Date: Apr 2018
Location: Whangarei, New Zealand
Boat: Leopard 45 Catamaran
Posts: 66
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Re: Robertson vs Phillips headed screws
Hi all
Roberton head screws are increasingly common in New Zealand as s/s wood screws. I vastly prefer them to the previous mixture of phillips/posidrive. as they engage well, stay on the end of the driver when one has run out of hands and usually the screw breaks before the head strips out if over exuberant. Slotted heads remain available.
Torx heads are available as s/s decking screws but have small heads.
Thus one continues to need a selection of drivers for different head styles & sizes - not a lot of cost.
Of course we still have both metric & imperial bolts as well
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03-02-2020, 15:45
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#28
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Registered User
Join Date: Mar 2016
Boat: Lagoon 440
Posts: 736
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Re: Robertson vs Phillips headed screws
As a wag I would say 90% of the screws on my lagoon are Posidriv, #2. I suppose the same goes for every beneteau, which makes a lot of boats on the water ... So I have a very good PZ2 srewdriver and quite a few pz2 bits for the makita. This is good enough for me as long as I am the only one driving those, because I use the proper tool. Wherever possible I am progressively replacing with torx, just because it is a superior design becoming more widely available. Never heard of Robertson, it doesn't seem to exist in france.
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03-02-2020, 16:05
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#29
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Registered User
Join Date: Apr 2011
Posts: 2,492
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Re: Robertson vs Phillips headed screws
Quote:
Originally Posted by John_char
Try fasteners on aircraft.. I’ve worked on some military jets that had both imperial and metric fasteners. Was a nightmare.
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Try Jaguars. Anything with the old V12 in has a crazy mix of the two - with some Whitworths thrown in for good measure.
My 86 XJS V12 was a case in point, most of it (but no means all) had been updated to metric, but the engine had not.
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03-02-2020, 16:12
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#30
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Registered User
Join Date: Aug 2011
Location: Melbourne Australia
Boat: Paper Tiger 14 foot, Gemini 105MC 34 foot Catamaran Hull no 825
Posts: 2,912
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Re: Robertson vs Phillips headed screws
I also prefer Allen key heads, Whether socket heads or counter sunk,
They dont fail in the slots like the Phillips heads do,
In Stainless or high tensile, They dont come loose either,
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