Quick release bolting

[Pulpeng]

I have a studded access door that requires unbolting for inspection. Besides replacing the door with something different (hinged etc) does anyone know if there's such a thing as a quick release nut that will use regular coarse thread.

 

[ajack1]

Would this type of thing work?

http://www.wdsltd.co.uk/Fixings, Torque Screws & Knobs/Nuts/WDS669 Quick Action Thumb Nut

 

[SincoTC]

Thirty years ago, I had an Australian Repco cylinder head reconditioning machine that had quick release hex nuts on its fixturing. These had a slanted clearance hole like those in ajack1's link above. They worked well, but they felt a bit spongy and tended to deflect the stud at the outer end due to the one sided thread, I would be reluctant to really torque them down.

There is a design of nut that avoids this problem and looks a lot stronger, although I've not had any occasion to try them and they're probably a lot more expensive.

http://www.wixroyd.com/products/pdf/w__205-206-collar-nuts.pdf

Trevor Clarke. (R & D) Scientific Instruments.Somerset. UK

SW2007x64 SP3.0 Pentium P4 3.6Ghz, 4Gb Ram ATI FireGL V7100 Driver: 8.323.0.0
SW2007x32 SP4.0 Pentium P4 3.6Ghz, 2Gb Ram NVIDIA Quadro FX 500 Driver: 6.14.10.7756

 

[Pulpeng]

Ajack - that's more of a no tool nut but in the application it would be difficult to use. Thanks though.

SinoTC - thanks - that's just the sort of thing I was looking for. Very interesting design.

 

[MadMango]

Search

http://www.mcmaster.com

for "quick-threading nut", then see if the hex slip-on nut will work for you.

 

[HeviiGuy]

Hello Pulpeng,

It's a relatively costly option but, have you considered Hydraulic Nuts?

Actual "tightening" and "untightening" is the biggest user of time in any such process - even with slip-on nuts as described above.

Hydraulic Nuts replace standard hex nuts. Once they're all spun down, they're connected in parallel to a common pump. This pump applies pressure to simultaneously stretch each nut. When the required preload has been applied (usually in mere seconds), one simply turns down a locking collar which retains the load. Dissassembly works in reverse: The quick-connect harness is attached, pressure is applied, the locking collars are turned back, the harness is removed and, the nuts are spun off.

Not only is this a "quick" process, it also results in a known applied load providing even gasket compression ;-)



Ciao,

HevïGuy

http://www.heviitech.com

 

[Bribyk]

How about wing nuts?

 

[Pulpeng]

Hevii Guy - that seems more complicated for what I'm looking for. All I'm after is securing hatches on conveyors/chutes etc quickly without changing hardware to handles/clamps etc. Part of the problem comes from too long of studs, dirty studs or damaged studs. They are just a pain for operators to remove 16+ nuts with a crescent and they are looking for hinges etc. I'd like to offer them SINCOTC or Madmango's suggestion. Both are good.

Thanks for everyones help though.

 

[unclesyd]

Here is the Zip Nut that should be readily available.

http://www.zipnut.com/index.html

 

[JMarv]

How about dzus fastener?

Joe
SW Office 2008 SP5.0
P4 3.0Ghz 3GB
ATI FireGL X1

 

[ajack1]

Another possible and cheap solution is to drill out the clearance holes to larger than the nut and simply buy or manufacture washers shaped like a C, undo the nut half a turn and slide the washer out.

 

[vigildesign]

Search for "Quick-Threading Nuts" at:

http://www.mcmaster.com

Hex slip-on nut is possibly what you are looking for.

 

[Bribyk]

If these are just hatches, can you drill the studs to accept a safety pin and use that with a fender washer and a rubber washer (to put some preload on it to keep from rattling)?

 

[ajack1]

Here are some C washers

http://www.wdsltd.co.uk/Fixings, Torque Screws & Knobs/Washers

 

[IRstuff]

How about the levered nuts used to hold bicycle wheels on their axles. Once the lever is released, they can be spun off by hand.

TTFN

FAQ731-376