×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Quick release bolting

Quick release bolting

Quick release bolting

(OP)
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.   

RE: Quick release bolting


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
 

RE: Quick release bolting

(OP)
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.   

RE: Quick release bolting

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

RE: Quick release bolting


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 winky smile

 

Ciao,

HevïGuy
www.heviitech.com

RE: Quick release bolting

How about wing nuts?

RE: Quick release bolting

(OP)
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.   

RE: Quick release bolting

How about dzus fastener?

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

RE: Quick release bolting

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.

RE: Quick release bolting

Search for "Quick-Threading Nuts" at:
http://www.mcmaster.com

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

RE: Quick release bolting

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)?

RE: Quick release bolting

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: Eng-Tips.com Forum Policies

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources