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Questions tagged [fasteners]

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Mechanical fasteners for HDPE pipe and sheet?

I need to fasten pieces of HDPE together but I’ve heard gluing HDPE is difficult. I've bought sheets and pipes to make a feeder for a tortoise. I will be using the sheets for covers for the pipes. The ...
Lovingtrout1034's user avatar
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1 answer
39 views

Looking for a type of the screw with very narrow end

I'm looking for a type of screw like this: but with even smaller diameter (pin size) smooth end. Preferably M6 thread and less than 2mm diameter end, preferably smooth. If specific part ...
Paul Jurczak's user avatar
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0 answers
71 views

Thread pitch for sheet metal screws - what are the pros/cons of high TPI?

Looking at these two self-tapping screws: The one on the left is 1/4-20 (coarse) thread, the one on the right appears to be 1/4 but I have no idea what TPI, super coarse? Trying to understand the ...
Wait But Why's user avatar
1 vote
1 answer
79 views

Tension and Shear on L-Bracket Offset From Wall

I’m planning to mount a mantle on a brick fireplace wall using two iron L-brackets that are 5” wide and 1/4” thick. Each bracket has four 5/16” mounting holes…two at the top and two at the bottom. The ...
jdchess's user avatar
  • 11
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1 answer
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How to connect / branch two metal wire cables at 90degree angle

I have a 1mm thick wire cable that's 200cm long. Using the same cable, at 10cm intervals, I have to branch / tee off at 90degree angles. Some sort of tee crimp / ferrule comes to mind as a last report,...
David jones's user avatar
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1 answer
49 views

how does this fastening system work

the bearing in the pictures below is securely fastened with some kind of rivet that doesn't take up any room on either side, so that the bearing can roll through some tight spaces while still bearing ...
jwsl224's user avatar
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2 answers
1k views

How do I choose the optimal screw diameter for a given hole size?

I purchased a cheap project box made of ABS plastic (so, relatively soft material). The box has pilot holes (with counterbore) on one half and matching smooth bosses/protrusion for driving the screws ...
Singularly Inquisitive's user avatar
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22 views

Straight Thread Seal Performance

Is it possible for straight threads to create a hydraulic/mechanical seal without the use of o-rings or sealants? From what I've read, in the oil industry buttress threads are used, in my application ...
Danielle's user avatar
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0 answers
211 views

Calculating riveting force

How do you calculate the force required to form a tubular riveted joint? Assume the tubular rivet's ID, OD, and initial and final length and diameters as variables.
Kaushik's user avatar
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1 vote
1 answer
778 views

Maximum tensile and shear loads on screw

I'm using a screw in an application where I want to have a high degree of confidence the screw will not fail, and I want to be sure I'm calculating the maximum tensile and shear loads it can sustain ...
MattHusz's user avatar
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1 answer
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Spring clamps recommendations to lock a breadboard when inserted

I need to lock a soldering breadboard to a 75 mm coupler cap. The picture below is upside down: the board will be hanging underneath the coupler cover. And the assembled pic: The board is inserted ...
dizcza's user avatar
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3 answers
1k views

Origins of the "threaded fastener pullout formula"

I was looking through NASA's document for "Installation Torque Tables for Noncritical Applications" and noticed their formula for the pullout load of a fastener on a certain material. It ...
TwoWaySpeedOfLight's user avatar
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1 answer
74 views

Distorted threads and bolt preload

Say a bolt is clamping 2 plates together, by threading into a distorted thread in the bottom plate. After the thread is used several times and becomes less distorted, will the relationship between ...
Bill's user avatar
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0 votes
2 answers
32 views

Sleeve nut with non-circular cylinder

I've been scouring the internet for hours to find this type of nut. The requirements are fairly simple: I want to cut holes into two metal sheets to join them with some kind of fastener (e.g. nut and ...
cg_f's user avatar
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2 answers
60 views

What is this fastener? Brass colored, three slots of some type. (And how to remove it?)

Here's a close up: This vehicle license-plate holder uses three of them: Unfortunately I can't see behind. Note, ignore the four small dimples on the plastic arranged rectangularly; unrelated. What ...
Fattie's user avatar
  • 111
-1 votes
3 answers
4k views

Inline pull load rating of lag bolts in wood?

Is there some sort of general guidance or load rating for wood screws (lag bolts) going into framing wood where the force is pulling directly inline with the screw orientation? More context and ...
Wait But Why's user avatar
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0 answers
148 views

Do automatic quick release mechanisms exist?

I'm imagining something like a cable tie that would automatically release after a certain amount of tension was applied. I guess a very basic way to do it would be to use different diameter strings ...
olly's user avatar
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2 answers
82 views

Are bolt and nut dimensions standardized?

Given the nominal size of a bolt/nut, e.g M10, can one construct all other dimensions from it? Do these dimensions differ between manufacturers or are these standardized. If so, where can I find ...
jessegerritsen's user avatar
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2 answers
151 views

Is high TPI sheet metal screw stronger for thin materials?

I just discovered that in addition to standard #10-12 sheet metal screws, there are #10-16 and even #10-24 versions available. I'm planning to use them on 0.06" thin aluminum, 0.12" nylon ...
Paul Jurczak's user avatar
0 votes
0 answers
23 views

Securing Removable "Clocked" Handrail Knobs

I am in the process of machining and assembling a smokebox for a model train. The smokebox in question is approximately 35mmx35mmx22mm. There are a series of handrail knobs and rails that are to be ...
Jake Henry's user avatar
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1 answer
117 views

Can you explain mathematical and mechanics formulation of equation in Junker 1969 paper on self-loosening of fastener by vibration?

Can you help me to understand how the first equation in the paper 'New Criteria for Self-Loosening of Fasteners Under Vibration' by GH Junker, 1969 is derived? I'm not able to understand the ...
Khushal Badhan's user avatar
0 votes
2 answers
60 views

I am designing a light that is hung from the end of an arm. How do I calculate the amount of force on the fastener where the arm attaches to the wall

I have a light hanging from an arm that is attached to the wall. I need to make sure that the fastener at the wall end is able to hold the weight. How do I calculate this?
Mike R's user avatar
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0 votes
0 answers
26 views

How to pull a component through a panel cutout using a screw mechanism?

I have a camera fixed to a cube frame structure made from aluminium extrusion. The frame will be covered by a 3 mm thick fibreglass enclosure (this is highly rigid) with a cutout for the camera, which ...
Pyy's user avatar
  • 103
0 votes
2 answers
183 views

Remove stripped screw inside of a tube

I have a stripped screw inside of a tube (see picture): The size of the screw is M2 and it seems to be glued. This is part of a camera objective so I want to avoid impact (e.g. tapping with a hammer)....
guideNeon's user avatar
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1 answer
55 views

Why aren't fasteners open standards?

I just wanted to find information for an M2 flat head hex socket machine screw which, I believe, is defined by ISO 10642, but unfortunately that is locked behind a paywall of a couple hundred dollars. ...
Kalcifer's user avatar
  • 101
0 votes
3 answers
387 views

Is it possible to tap a hole partially through a 3mm aluminium sheet?

I would like to secure components to an aluminium sheet that is 3mm thick. Ideally I do not want to drill holes all the way through the sheet because it is important that a seal is maintained. I am ...
Pyy's user avatar
  • 103
0 votes
0 answers
165 views

Which side is "up" on this nylon nut?

I have this nylon nut, and I wonder which side should contact the material: Is it the wide hex face, because the nut is built like a lock-nut? or is it the cylindrical face because it serves as an ...
Kenn Sebesta's user avatar
0 votes
1 answer
33 views

What type of rivet is this?

This is a pivot point on a linkage in my coffee table. It appears to be a rivet with a tail that was pressed with a cross-shaped punch to widen it. I haven't see something like this before. Is there a ...
Ryan's user avatar
  • 67
1 vote
3 answers
183 views

Steel bracket fixing spacers on a wall

What could I do to address the uneven vertical wall (not plumb) behind the bottom of the steel bracket? Would you fill in the gap with sand/cement and once dried tighten the bolt or use steel plates ...
Giuseppe Cimadoro's user avatar
1 vote
1 answer
136 views

Screw Calculations/Math

At the risk of every woodworker in the world snickering at me, I'm curious how strong my wood joints are and want to know how much weight a table supports. I'm an aero engineer who ended up in EE, but ...
bonhoffer's user avatar
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1 answer
236 views

Unable to understand minimum length of engagement for bolts

I've attached a snap of the part I'm unable to understand Machinery's Handbook 29th Edition. Here's a link to the ebook as well https://www.vtc1.org/cms/lib/PA03000913/Centricity/Domain/21/Machinerys%...
Wren's user avatar
  • 37
0 votes
3 answers
329 views

Does the nut experience the same forces a bolt experiences but in opposite directions as reaction forces?

More specifically, if I have an eye bolt being used to lift a body, I can find the various stresses acting on the bolt, but I want to know what happens to the threaded area of the body where the eye ...
Wren's user avatar
  • 37
1 vote
2 answers
294 views

Solutions for a slanted roof

I'm using I-Joists to span this 27' vaulted living room and create a shed style roof. I've got two problems. Because of the angle, the joist won't make full contact with the walls (short of 20 years ...
Jared Cravens's user avatar
1 vote
3 answers
322 views

What is the real name of those rivet-like plastic fasteners?

I'm trying to find the name of a removable fastener operating by a deforming retainer in the front like in the picture: [ All I found online are Alibaba and similar listings that don't seem to contain ...
Jan's user avatar
  • 11
5 votes
4 answers
3k views

Why can't screws be used for locating parts?

I remember hearing awhile back that it's not a good idea to use screws to locate/align parts. Why is that? Apparently dowel pins, or "locating pins" should be used instead. From my ...
TwoWaySpeedOfLight's user avatar
3 votes
5 answers
8k views

Are there any benefits to using a regular washer alongside a lock washer?

I am new to fasteners in general, and was wondering if anyone knew if it was acceptable to use a regular washer underneath a split lock washer. There are two applications, one is on top of a 3D ...
TwoWaySpeedOfLight's user avatar
23 votes
5 answers
8k views

Why exactly does a washer help distribute the stress around a bolt?

Usually the reason for having a washer under a bolt head is stated to be that it helps to evenly distribute the stress to the clamped material surface. But why is this? I would understand if the ...
S. Rotos's user avatar
  • 2,259
1 vote
3 answers
886 views

Mechanical fasteners made of HDPE?

I need to fasten pieces of HDPE together but I’ve heard gluing HDPE is difficult (after all, glue comes in HDPE containers, and the glue doesn’t get stuck in the bottle). Using mechanical fasteners ...
Bruce Simonson's user avatar
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0 answers
53 views

Thread adapters larger than 1/2"

I have a 1/2-20 stud that I need to step up to a 3/4-16 stud. I searched around for 1/2-20 female to 3/4-16 male thread adapters, but was only able to find such a product on McMaster for sizes 1/2 and ...
ThatsRightJack's user avatar
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0 answers
1k views

Maximum strength size thread for aluminium sheet per thickness

Is there a rule of thumb, or a table which helps one determine what is the maximum strength thread size to use for aluminium sheet? I am interested in threading 3mm, and 2mm thick sheet aluminium. I ...
run_the_race's user avatar
0 votes
1 answer
354 views

What type of fastener / rivet is this please?

I think I may have worked this out but I would love it if a real engineer could confirm it please? Is the fixing shown in the photos a shoulder rivet? Semi tubular? For the record the pictures show ...
JCP's user avatar
  • 1
0 votes
1 answer
84 views

What type of fastener is this? How does it work?

I'm trying to find more information on this type of fastener. It looks like a variation on a bayonet mount but I'm not exactly sure how it is locking in place.
Travis S.'s user avatar
  • 101
2 votes
1 answer
143 views

Are concrete screws suitable for repeated removal and reinstallation?

Is a concrete screw like the HILTI HUS3 removable? I.e. can it be repeatedly unscrewed and reinstalled as required? Will this damage the fixing or the hole in the concrete? We're thinking about using ...
egg's user avatar
  • 857
0 votes
2 answers
54 views

Mounting a digital indicator on a plate

I have a flat aluminium plate and I need to mount a digital indicator[1] on it. The digital indicator doesn't seem to have any mounting holes itself so I think I need to use a clamp to hold it. I don'...
John Smith's user avatar
0 votes
2 answers
4k views

What is Proof Load of Bolts?

I seem to be getting conflicting information. Shigley's Mechanical Engineering Design textbook states that, "proof load is the maximum load (force) that a bolt can withstand without acquiring a ...
marshmellow's user avatar
0 votes
0 answers
31 views

Is there a term for this kind of eccentrically threaded fastener or washer that has wrench flats and curved faces

Is there a standard term for this fastener or for the kind of problem it is intended to address?
Tim's user avatar
  • 225
0 votes
1 answer
94 views

Mounting methods for thin wall cast aluminum

Having a cast aluminium enclosure with the 3mm wall thickness. now I need to mount this to a mounting plate which fixed in vertical walls. can I have some idea on how should I choose the appropriate ...
Nidershan Suguneswaran's user avatar
0 votes
1 answer
43 views

Fasten adjustable perpendicular cylinders rotating on axis

What part(s) make it simple to secure two perpendicular cylinders together when one of the cylinders is rotating on its axis? In the drawing below, C(3) rotates with a simple motor. C(1) and C(2) ...
JustBeingHelpful's user avatar
0 votes
1 answer
127 views

What is the best way to fasten securely a load onto a hollow brick?

Due to the ongoing COVID pandemic, I decided to put a basketball hoop on one of our outside walls, so that me and my son can stretch a bit. The problem is that the wall I plan to put the basketball is ...
NMech's user avatar
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0 votes
0 answers
335 views

classes and grades of steel and stainless steel

I'm trying to learn the standard nomenclature for the steel and stainless steel mainly used in the bolts, screws, nuts, and other fasteners in general. So far I have created this table: | Metric ...
Foad's user avatar
  • 249