Questions tagged [fasteners]
The fasteners tag has no usage guidance.
29
questions
0
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3answers
56 views
Fastening a Nut on threaded rod from the middle
Does there exist any type of Nut, that can be screwed on a threaded rod that can slipped in without having to go to the ends of the threaded rod? I can sort of imagine a Nut that was a ...
1
vote
1answer
54 views
Is there a rule of thumb to construe a screw
When your first idea is drafted you calculate which forces/pressures and so on are working on your system. And then you break the forces down into the single screws which are built in your device.
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5
votes
3answers
645 views
What causes a fastener to lock?
I am rebuilding a car engine. With some of the fasteners I am unscrewing, I notice that a lot of torque is required to undo the fastener. It feels like a snap when undoing a fastener, rather than a ...
-1
votes
1answer
79 views
What type of fastener is this?
Used to connect the chain for a window actuator to a U-shaped window bracket.
The threaded end screws into a bolt hole (M5.5 female thread) on one side of the U-bracket. The tip of the fastener fits ...
0
votes
1answer
23 views
Correct sizing of fastener for console
Following situation: I need to mount a console holding a load to the edge of a 25cm concrete plate. I want you to check my reasoning. This is the situation:
My thinking is: The load is 170kg, which ...
0
votes
2answers
48 views
Vibration table for tests (7-200Hz) from extruded aluminium profiles bolted together - good idea (?)
I need to design a vibration table (approx. 1000mx1000mm) to test products between 7-200Hz.
I was wondering if it is recommended to make the table structure from standardised, extruded aluminum ...
1
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0answers
44 views
Recommended torque
I am working on an assembly where I have various screws, mainly metal on metal fastening.
Where can I find a realiable source for recommended torque settings based on screw size, screw material and ...
1
vote
1answer
78 views
Help identifying a fastener/screw
I'm trying to identify the pictured fastener. It's a single piece around the arm of a gas spring, allowing it to pivot. I've had to replace the spring, but the screw is size M8 while the eyelet on the ...
2
votes
0answers
36 views
How to prevent movement in this 3 DOF setup?
I have a 3DOF platform that I'm trying to make more stable. It's difficult to explain in words what the issue is so I've added a GIF below.
Any ideas of how I can get rid of this wobble? The DOF arm ...
1
vote
2answers
82 views
I have an unidentified press-fit nut that I need to reproduce, can anyone tell me how to find this?
I received these fittings as part of a package, but now we need more of them. Can anyone identify this assembly, or even better help me learn how to recreate it? My coworkers and I are stumped.
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2answers
781 views
Screwing into Rubber - Screw Selection
I am attempting to mount a device by screwing into ~2" of rubber (not sure what durometer or material, but it is decently firm, maybe 70 durometer). However, I am not sure what type of anchor to use (...
5
votes
2answers
451 views
Why are Whitworth threads angled at 55°?
You're probably thinking, "Well.. Why not? It's gotta be something.." Right?
But 55° is kind of an odd angle if you think about it.. and it does seem like a pretty specific choice considering a ...
1
vote
1answer
77 views
Derivation on torque required to raise load, isn't there a force disapearing?
I drew a little picture:
Try to use you imagination to view these pictures as profile of bolt threads. In derivation on torque required to raise load, the angle of friction (ro) is calculated like in ...
4
votes
2answers
249 views
When are Nyloc nuts indicated instead of cap nuts?
Are there any applications in which a Nyloc nut is preferred to a proper cap nut?
As best I can tell: a Nyloc nut is just a specialized cap nut that will fail under lower torque and temperatures than ...
0
votes
3answers
71 views
Fat hexagonal M3 nuts, with outer diameter greater than 6 mm
This is a follow on from my previous question, Will standard M5 T-slot nuts fit these different 2020 aluminium extrusions?
The extrusion has this profile:
and here is a more in-focus photo, of four, ...
2
votes
1answer
1k views
Will standard M5 T-slot nuts fit these different 2020 aluminium extrusions?
I am trying to source the parts for a Wilson II 3D printer, and the recommended struts are made from 2020 aluminium extrusions, like so:
However, in Bangkok, I can only find this type:
Note that the ...
2
votes
1answer
944 views
Cleaning Shavings from Tapped Hole
I have a hole that contains metal shavings after I have tapped it. Is there a common method to clean out metal shavings from between the threads of the tapped hole?
2
votes
1answer
82 views
Hot Dip Galvanized Nuts
I’m in a position where I need to order high volumes of nuts and bolts for a project.
I read through a South African National Standard, SANS 2001-CS1, in which it states that when I use hot dip ...
13
votes
2answers
2k views
What is this Y-shaped screwdriver bit, and what is its purpose?
I found this strange looking bit in a bit set of uncommon bits, including Security Torx, hexalobular, tri-wing, spanner head, 12-point flange, Torq-set and others. It's the only one that I could not ...
5
votes
1answer
495 views
How does Alloy 20 compare with Ti 6-4, C-276 and 316 stainless for corrosive service?
While I've designed tons of plastics for corrosive service, the fasteners to hold the plastics together are inevitably metallic. There have been a lot of ways to protect them from rusting (due to ...
3
votes
2answers
2k views
Rule for bolt thread engagement
When bolting something like a flange or a dead/blind end to a port on a pressure vessel (lets say rated to 2 ATM), is there a good rule of thumb on how much of the threading should be engaged into the ...
2
votes
0answers
146 views
Alternatives to stainless steel staples
I have to mount a glass fibre woven mat onto a stainless steel foil and using staples seems to be the only way to do it. The environment is one where a large variety of solvent vapors will be ...
1
vote
1answer
745 views
What screw for 2.0 mm plastic hole in housing
I'm thinking about using the Bopla UM 32009 housing for my product. It has little standoffs for attaching PCBs. These standoffs are made of plastic, and seem to be drilled (or molded?) to a diameter ...
1
vote
1answer
248 views
Flat Head Machine Screws with Undersized Threads
I am in search of a flat head machine screws with an 82 degree countersink that have 1/4-20 UNC thread, but have a countersunk head that is characteristic of a 5/16-18 standard screw. That is, I want ...
5
votes
4answers
693 views
Is there a standard name for a flanged threaded tube?
I have designed a custom part that I need, but it is so simple I'm sure there must be off-the-shelf versions available. However I don't know what it's called to search for it.
The image on the left ...
2
votes
0answers
153 views
Thread-locking on AISC Clevises
I have a project that includes some standard AISC clevises on threaded rods in pure tension. I am trying to find guidance on how best to address the possibility that the rod could rotate with respect ...
9
votes
5answers
9k views
Why are most standard bolt threads single start?
When looking at thread descriptions, one of the basic properties is always the number of thread starts.
As far as I could tell, all of the major standard bolt threads are single-start. This includes:
...
1
vote
1answer
2k views
Sizing plate washers for through-bolting to concrete
We are working on some equipment that is going to be attached to existing, 3,000 psi reinforced concrete floor slabs. In some locations, the best way to do this is to through-bolt and 'sandwich' the ...
1
vote
3answers
715 views
Tolerance Fit with Spring Dowels
I am designing a stainless metal base plate to mount an orientation critical sensor. The sensor has two 6H7 6mm deep holes to align it. One of the holes is a slot to allow for adjustment.
The sensor ...
