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AutoBahned
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Slotted Screws
I'd prefer a fatwah on them, but since that is not likely
... is there any DIN, JIS, or ISO std. on these Affronts to Fastenerdom? |
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10-28-2020, 05:26 PM
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Been here a while
Join Date: Apr 2004
Location: East coast, west coast, typ. 35,000 ft
Posts: 2,434
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I often wonder, how did flat head screws ever become the standard for electrical cover plates.....how often do you slip off the screw head...phillips would be so easy and eliminate the risk completely
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looking for 1972 911t motor XR584, S/N 6121622 |
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10-28-2020, 05:32 PM
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Registered
Join Date: Oct 2003
Location: Mount Pleasant, South Carolina
Posts: 14,160
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Torx or roberts for the win.
Isn’t slotted screws a Canadian thing? |
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10-28-2020, 05:36 PM
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Join Date: Apr 2002
Posts: 30,437
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OCD standard states all slots must be verticle
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10-28-2020, 05:36 PM
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Registered
Join Date: Mar 2004
Location: Higgs Field
Posts: 22,602
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Yes, there are published standards. ASME for example. The problem is that most cheap ass screws and screw drivers are not made to meet them. When properly made (both fastener and tool) they are at least as good as anything else, and superior to many.
I have several gunsmith's sets of screw driver bits that contain over 40 different sizes of slotted tips alone. It's amazing what can be done when the bit fits a proper slot. You can apply a lot more torque, either to break loose a stubborn fastener or to adequately torque down a new one, with a slotted fastener than you can with any allen head or phillips head.
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Jeff '72 911T 3.0 MFI '93 Ducati 900 Super Sport "God invented whiskey so the Irish wouldn't rule the world" |
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10-28-2020, 06:39 PM
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Bland
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Quote:
Robertson screws, that’s us. Like a torx but square. 
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06 Cayenne Turbo S and 11 Cayenne S 77 911S Wide Body GT2 WCMA race car 86 930 Slantnose - featured in Mar-Apr 2016 Classic Porsche Sold: 76 930, 90 C4 Targa, 87 944, 06 Cayenne Turbo, 73 911 ChumpCar endurance racer - featured in May-June & July-Aug 2016 Classic Porsche |
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10-28-2020, 06:44 PM
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Quote:
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--------------------------------------------------------------------------- "There is nothing to be learned from the second kick of a mule" - Mark Twain |
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10-28-2020, 07:51 PM
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Information Junky
Join Date: Mar 2001
Location: an island, upper left coast, USA
Posts: 73,189
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Quote:
I'm no fan of straight slot screw heads but will note that having a square cut drive blade (of the right size) makes them not so bad. Most drives have tapered tips that are horrible. Well, other than for opening paint cans. https://chapmanmfg.com/products/slotted-insert-bits has a good info graphic
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Everyone you meet knows something you don't. - - - and a whole bunch of crap that is wrong. Disclaimer: the above was 2¢ worth. More information is available as my professional opinion, which is provided for an exorbitant fee. 
Last edited by island911; 10-28-2020 at 08:30 PM.. |
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10-28-2020, 08:26 PM
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Unregistered
Join Date: Aug 2000
Location: a wretched hive of scum and villainy
Posts: 55,652
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Jeff nailed it ^.
With quality screws, and the right sized quality driver, slotted screws are just fine and easy to work with. But too often, people get stuck with crap screws or the wrong fitting driver and it turns into a PITA fight. 
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10-28-2020, 09:28 PM
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I see you
Join Date: Nov 2002
Location: NJ
Posts: 29,889
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An additional question...has anyone ever successfully dressed a straight slot blade after it has been rounded? I have several OLD screw drivers whose shanks and handles are still in great shape but need the blades to be dressed.
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Si non potes inimicum tuum vincere, habeas eum amicum and ride a big blue trike. "'Bipartisan' usually means that a larger-than-usual deception is being carried out." |
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10-29-2020, 05:26 AM
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Join Date: Apr 2005
Location: outta here
Posts: 53,115
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Sure. That's why God invented the grinder.
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10-29-2020, 05:34 AM
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Join Date: Jan 2002
Location: Long Beach CA, the sewer by the sea.
Posts: 37,690
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A properly fitting screwdriver in a slotted screw is a wedge that just misses reaching the bottom of the slot. Yes, you need way more straight screwdrivers than others. I have a whole tool chest drawer with only flat blades. I deal with flat screws a lot in the antiques game.
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10-29-2020, 06:29 AM
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Registered
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Quote:
Together they make up for poutine.
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10-29-2020, 06:34 AM
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Registered
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Quote:
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10-29-2020, 06:35 AM
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Get off my lawn!
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I try hard to have good screw drivers with flat square tips. Most of them screwdrivers have hardened tips so a grinder just ruins that.
I have one "screw driver" that is destroyed from my wife using it to scrape caulk out of the brickwork and concrete. It is just a rounded tip and totally useless as a screw driver. It is great for scraping out caulk now, nice and sharp.
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Glen 49 Year member of the Porsche Club of America 1985 911 Carrera; 2017 Macan 1986 El Camino with Fuel Injected 350 Crate Engine My Motto: I will never be too old to have a happy childhood! |
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10-29-2020, 06:50 AM
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Platinum Member
Join Date: Jul 2001
Location: Leave the gun. Take the cannoli.
Posts: 20,949
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I don't even like Philips anymore. I buy square and torqx whenever possible.
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10-29-2020, 06:52 AM
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Quote:
I purged my screw collection of every Phillips wood screw more than 1" long. Gave away about 5 pounds of screws. I just don't need the aggravation.
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10-29-2020, 06:58 AM
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AutoBahned
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Even the best can slip sideways in (out) of the slot...
SnapOn's have wedge shaped tips as are Hazets (the latter have or had a nice anti-slip grind or coating on the tips) PB Swiss uses a parallel sided tip - like a hollow grind on gunsmith's screwdrivers Zeke, I hadn't heard the criterion in post 12 Brownie points if you can guess where slotted screws are used on 911s... |
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10-29-2020, 10:48 AM
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Location: North of You
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Quote:
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"A machine you build yourself is a vote for a different way of life. There are things you have to earn with your hands." |
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10-29-2020, 11:11 AM
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Registered
Join Date: Nov 2003
Location: Seattle
Posts: 1,247
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Quote:
The brake rotors on some older models might be held on with slotted screws. Most are phillips, but I seem to recall an early 911 with slotted screws in the rotor.
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"Rust never sleeps" |
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10-29-2020, 03:42 PM
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Crop Duster
Kachow
1976 Porsche 930
1983 Porsche 911sc Cabriolet 3.0
Carrera
