1212pcs Black Nylon Plastic Pan Round Head Phillips Screws Bolts and Nuts,M2M3M4M5M6 Metric Threaded Screws Bolt and Nut Assortment Set for Micro Controller Board Building,Insulate or Fasten PCB Board

These are hard to find. Great price and quantity and different sizes. I used them all the time in electronics projects and making cb radio repair.

They seem to be strong and the nuts and screws fit together and turn smoothly. Great for my antenna building when I'm looking to keep as much metal away from the radiators as I can.

This is a big box of fasteners. Where does it make sense to use these? Well, anywhere where an inductor is around and a metallic fastener would change the inductance. Maybe something in the woodwork / metalworking space where you're worried about a cutter hitting steel and damaging it. Or perhaps in a food-service area where frequent cleaning would rust out normal fasteners. One last thought -- nylon isn't as strong as steel -- Could use that to engineer a break-away-part for some reason.

This nylon screw and nut kit has every screw size that is required for assembling small parts. They are ideal for fastening the 3d printed parts associated with my electronic projects. I also use them for fastening piggy backed PCB boards since they are electrically non-conductive. Nylon screws are non-corrosive which helps in those types of environments. They shouldn't be used in wet environments because the water changes the molecular structure of the plastic causing it to weaken. They also shouldn't be used in hot environments - over 120 degrees F.

So these are adequate for use cases that need only mild cinch force.They thread together with the nuts nicely and if you press down hard enough, the nylon actually resists stripping reasonably (though it's still very possible to strip the heads if you're not pressing down and spinning too fast).I tried to register the force needed to strip either the heads or threads, but it is below 2nm (the low setting for my bike torque wrench).With an impact driver, you'll quickly spin the screw in place against the nut. Pictured is how far the screw head will cinch into some birch plywood before stripping the threading. When the treading strips, the screw turns inside the nut. Pleasantly though, the screw still holds quite well and can be backed out and run again etc. So the 'failure' is very soft and forgiving.There's no snapping these either. I tried to break them with pliers and they bend and flex without breaking. I was eventually able to pry/rip the head off, so this is clearly the weakest spot of the screw (it took quite a few tries).They're not sufficient for any situation where you'll need to secure something "very snug" via the force of the screw, but would be perfect more many less demanding use cases. Based on my attempts to break etc. I expect the pull "hold strength" is pretty good, the head of the screw will deform or separate before the nut will strip off from the screw shaft (provided it's fully threaded). Again, this is an estimate, since I did not test this with weights or measurable forces. I'm basing it on the resistance to my attempts and that I was able to pull the head off with pliers eventually.I was hoping to secure a tool with these and then smooth over the heads in a situation where if they were cut etc it wouldn't hurt a router bit, but they are unable to snug into place sufficiently before spinning in the nut to work for that use case. Probably I was expecting too much from nylon, I imagine they'll work in many lighter load uses, of which I don't currently have examples.They packaging is good, the box is sturdy, seems fairly crack-resistant, is well labeled with the diagram corresponding to the square of the items in the box, and the smallest nuts (M2) are actually in a little bag, which is nice b/c they could go everywhere easily.pics: 1. opened box with label, 2. end of screw that spun inside the nut (circled) vs a fresh screw. 3. separated head, achieved manually with pliers, shows where separation might most likely occur. 4. screw & nut cinched maximally into 1/4" birch plywood. You'd need to countersink a little to get flush b/c the screw isn't able to deform the wood enough on its own.

Two main features for these: electrical insulation and very low weight. The tradeoff compared to metal screws is the strength, the torque at which these can be tightened. Not a fair comparison to steel screws, for sure. Still, nylon does behave very well in threads, there is some give-in before actual breaking, not brittle.All parts in the set look well made, I could not spot any manufacturing defect. The plastic box they came in is adequate, partitioned and having real hinges, not the bending plastic kind.These are great for electronics, perfectly insulating for circuit boards and other assemblies on attaching from the chassis. The flat head makes these usable where aesthetics matter, keeping a flat surface by using beveled holes for the screws. For me, for all kind of wood projects these more than suffice and are actually preferable instead of metal screws.

This is something you do not find easily. When you need it, you need it. This is a very complete assortment. The nylon seems very strong,, the threads are very well cut and distinct. A very nice kit to have for a variety of uses.

Pros:1. Lots of screws.2. Organization is nice.3. Quality is decent.Cons:1. None - its a nice small backup screw set.Overall:Nice to have spare screws around for when you need a random size. I recommend this set.