What are these screws called in english ?

[Lunker Larry]

These are common where very stubby screws are required

[jurelometer]

Blind inserts can save the day in modern reels that have to be opened for service often. The undersize screws in plastic is no good. The manufacturers act like you will never take the darn thing apart; and I guess they are right more often than not.

As long as the hole can be widened enough, and the wall is deep enough to accept a threaded insert and still have enough meat left to hold it.  In many cases for reels, pull-out load requirements are relatively minimal - so that part is OK,  but just by memory, I am not remembering many plastic reel parts that had enough meat to accommodate inserts.  At least the types of inserts that I am familiar with with.

Ome more note on thread forming screw hygiene:  If I am extra careful to reuse the same female threads and not over-tighten, I can get dozens of re-uses easily with thread forming screws.  Not nearly as good as tapped metal threads, but good enough.

The tricky part about thread forming screws is that they are very accommodating about forming a new thread path in the hole if you are not careful.  Depending on the type of plastic, that threaded hole lifespan can drop into the low single digits if you are not re-using the same female threads.

-J

[Drisse]

Truss or pan head self tapping

Bought them in 50# cartons of 304 or 316 stainless in both 1 and 1 1/4" lengths depending on the contract.

What's your application?

In reels I find them in the Chinese cheapo's, quick production, lifespan not so much.

Just as extras for ex. graphite reels. This time I needed a screw for a Shimano Tekota.

[Donnyboat]

Yes Drisse, just dont go to far with them, in plastic, gee Ted sound like you have done plenty of screwing, cheer Don.

[Cuttyhunker]

I'd bet your local reel fix it guy has a pail (or two) of beyond repair cheepos.  Just a thought