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Questions tagged [fasteners]

93 questions
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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 understanding, I suppose it is because there are much tighter…
TwoWaySpeedOfLight
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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 a metal cap nut.
feetwet
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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 printed part (PLA or ABS), and the second which is on a…
TwoWaySpeedOfLight
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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?
Zero
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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 galvanized fasteners the nut should be of a higher…
Noble
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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 recommendations are not allowed on this forum, just a general…
Paul Jurczak
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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 different applications and pros/cons of the…
Wait But Why
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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 is this strange fastener and how to remove it…
Fattie
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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 integrated washer?
Kenn Sebesta
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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.
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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 permanent set". Other sources online say that proof…
marshmellow
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How to remove/replace a screw with a lock washer in a tight place

I'm trying to remove the screw in the images below from a metal cover. The screw is locked in place by what I believe is called a locked washer. The screw can rotate, but I can't move it in and out. The height to the "lip" is about 12mm (see first…
MattHusz
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"Barbed" fastener, ideally with a release

I'm trying to identify a fastener or type of fastener. I have a stud/post that comes up through a board and the fastener is something that would push on and hold in place. Ideally it would be removable.
Zachary Russell Heineman
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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 U shape instead of O shape, or perhaps two C shapes that could…
Dave Butler
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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 into a 3mm diameter slot on the other side. The…
Trend2019
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