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Fastener humor - special screws #4555283
10/26/17 03:59 PM
10/26/17 03:59 PM
Joined: Aug 2008
Posts: 3,150
USA
Reddy45 Offline OP
Reddy45  Offline OP
Joined: Aug 2008
Posts: 3,150
USA

Re: Fastener humor - special screws [Re: Reddy45] #4555391
10/26/17 05:58 PM
10/26/17 05:58 PM
Joined: Oct 2012
Posts: 2,106
Northern Ontario, Canada
Danno Online content
Danno  Online Content
Joined: Oct 2012
Posts: 2,106
Northern Ontario, Canada
Wow, someone had a lot of free time on their hands ....


2016 Sorento SX V6 AWD
2015 KIA RIO SX
2010 Mazda 3 2.0L
2009 Venza V6 AWD
2013 Sonata 2.4L RIP in write-off crash
Re: Fastener humor - special screws [Re: Reddy45] #4555427
10/26/17 06:20 PM
10/26/17 06:20 PM
Joined: Mar 2010
Posts: 1,406
USA
SOHCman Offline
SOHCman  Offline
Joined: Mar 2010
Posts: 1,406
USA
Don't read this thread at work or you'll be screw'd! wink


I urge people not to wait 100K to change out the fluid in their transfer case units. -Kestas
Re: Fastener humor - special screws [Re: Reddy45] #4555455
10/26/17 06:32 PM
10/26/17 06:32 PM
Joined: Aug 2008
Posts: 18,298
Ontario, Canada
StevieC Online content
StevieC  Online Content
Joined: Aug 2008
Posts: 18,298
Ontario, Canada
And I thought I was screwed. Who knew! LOL


'18 Highlander - AMSOIL SS 0w20 / ATF / Severe Gear
'06 Santa Fe - 535,000km AMSOIL SS 0w30 / ATF (R.I.P)
Re: Fastener humor - special screws [Re: Reddy45] #4555463
10/26/17 06:35 PM
10/26/17 06:35 PM
Joined: Mar 2017
Posts: 117
northwest pa
justintendo Offline
justintendo  Offline
Joined: Mar 2017
Posts: 117
northwest pa
some good ones there! 903 would be a hot seller im sure!


2013 escape 2.0 awd
2008 fusion 2.3 mtx
1996 f150 4.9 2wd mtx
1999 kaw zrx 1100
many husqvarnas
Re: Fastener humor - special screws [Re: justintendo] #4555465
10/26/17 06:36 PM
10/26/17 06:36 PM
Joined: Aug 2008
Posts: 3,150
USA
Reddy45 Offline OP
Reddy45  Offline OP
Joined: Aug 2008
Posts: 3,150
USA
Originally Posted By: justintendo
some good ones there! 903 would be a hot seller im sure!


As long as it isn't used for a blind hole...and the chips from drilling/tapping don't clog the threads...then it might actually work!

Re: Fastener humor - special screws [Re: Reddy45] #4555584
10/26/17 08:25 PM
10/26/17 08:25 PM
Joined: May 2012
Posts: 5,363
Fort Lauderdale, FL
DoubleWasp Offline
DoubleWasp  Offline
Joined: May 2012
Posts: 5,363
Fort Lauderdale, FL
Whacking screw for unthreaded screwing LOL.

Nearly died laughing on that one.


07 Lincoln Navigator M1 0w-40/FU
68 Charger R/T / Supercharged 440 VR1/DBL7349
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17 Maserati GranTurismo Cabrio
Re: Fastener humor - special screws [Re: Reddy45] #4555698
10/26/17 10:04 PM
10/26/17 10:04 PM
Joined: Dec 2016
Posts: 6,226
Waco, TX
Linctex Offline
Linctex  Offline
Joined: Dec 2016
Posts: 6,226
Waco, TX
Some of these actually exist, like DIN 903 .... but are very expensive


"The evidence demands a verdict".
(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."
Re: Fastener humor - special screws [Re: justintendo] #4555699
10/26/17 10:04 PM
10/26/17 10:04 PM
Joined: Dec 2016
Posts: 6,226
Waco, TX
Linctex Offline
Linctex  Offline
Joined: Dec 2016
Posts: 6,226
Waco, TX
Originally Posted By: justintendo
some good ones there! 903 would be a hot seller im sure!


They are real - just very expensive


"The evidence demands a verdict".
(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."
Re: Fastener humor - special screws [Re: Reddy45] #4555846
10/27/17 02:42 AM
10/27/17 02:42 AM
Joined: Dec 2002
Posts: 40,834
'Stralia
Shannow Offline
Shannow  Offline
Joined: Dec 2002
Posts: 40,834
'Stralia
898...flatmate in Uni wanted to hang something on a vertical wooden post...told him to grab my toolbox, and found him hammering woodscrews in...he graduated first class honours in engineering.

881 - used in British Steam turbines.
887 - used in british turbines (there's another one called a "cheese head", which has a ridiculously large "cheese" head so that the flat bladed screwdriver is less likely to mangle it.

891, 892, 896, 897 - when we built Mount Piper, the HVAC company had a lot of ductwork stuff manufactured off site, and installed on site. The inspector noticed that only 1/3 of the bolts and nuts were installed, climbed a ladder and checked...the holes were misaligned (and needed an 875 really). Two days later, they told him it had been fixed.
Expecting them to have slotted the holes, and weakened the joint, he found them to be really good looking. But the back didn't match the front...they epoxied heads on one side and cut off bolts with nuts the other.

894, you can get structural lock washers like that, anti run back and can check crush for right pre-tension.


900, you can get torque limiting screws...usually snap off

893 - sort of already exist, in aerospace.

910, drawer handles come with those, break off to length.

905, with LH thread and right hand thread are used in rigging levelling equipment.

But the loser is the "superbolt"...When I was in turbines, the salesmen for these would be around all the time...

Design of steam turbine casing joints is quite specific, the bolt is installed at 0.15% strain, and the joint integrity relies on the effective length of the bolt being known, and the nut being a solid, square anchor point/end stop...we tension them by induction heating the stud (or hydraulic stretch), then rotating the nut through a specified rotation to get the strain correct.

These introduce "ease", but include additional elastiicity, and misalignment potential...I feel sorry for those fooled into them.


Re: Fastener humor - special screws [Re: Shannow] #4557269
10/28/17 01:33 PM
10/28/17 01:33 PM
Joined: Oct 2016
Posts: 128
WV
jonnied1 Offline
jonnied1  Offline
Joined: Oct 2016
Posts: 128
WV
Originally Posted By: Shannow
898...flatmate in Uni wanted to hang something on a vertical wooden post...told him to grab my toolbox, and found him hammering woodscrews in...he graduated first class honours in engineering.

881 - used in British Steam turbines.
887 - used in british turbines (there's another one called a "cheese head", which has a ridiculously large "cheese" head so that the flat bladed screwdriver is less likely to mangle it.

891, 892, 896, 897 - when we built Mount Piper, the HVAC company had a lot of ductwork stuff manufactured off site, and installed on site. The inspector noticed that only 1/3 of the bolts and nuts were installed, climbed a ladder and checked...the holes were misaligned (and needed an 875 really). Two days later, they told him it had been fixed.
Expecting them to have slotted the holes, and weakened the joint, he found them to be really good looking. But the back didn't match the front...they epoxied heads on one side and cut off bolts with nuts the other.

894, you can get structural lock washers like that, anti run back and can check crush for right pre-tension.


900, you can get torque limiting screws...usually snap off

893 - sort of already exist, in aerospace.

910, drawer handles come with those, break off to length.

905, with LH thread and right hand thread are used in rigging levelling equipment.

But the loser is the "superbolt"...When I was in turbines, the salesmen for these would be around all the time...

Design of steam turbine casing joints is quite specific, the bolt is installed at 0.15% strain, and the joint integrity relies on the effective length of the bolt being known, and the nut being a solid, square anchor point/end stop...we tension them by induction heating the stud (or hydraulic stretch), then rotating the nut through a specified rotation to get the strain correct.

These introduce "ease", but include additional elastiicity, and misalignment potential...I feel sorry for those fooled into them.





Super Bolts are great when used for the right application. We used them to bolt the flanges (3in. dia. studs, 48 in. dia. flanges) to the universal joints on large rolling mills. Prior to that, we had to use a hydraulic torque wrench suspended from an overhead crane.


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