What Does The Code Of Screws Represent

screws

I have different packs of screws. They all have unique codes.
E.g. 6-35-B1120-4RE*12

  • 6 might be the diameter # (which is approx. 9/64 inches).

  • 35 might be the # of threads. (It doesn't appear to have that many, but it's so small. Perhaps I can't see it, or perhaps threads aren't counted the way I'm first inclined to think they are.)

  • 1120 might be 11/20 inches long.

  • R might stand for replacement (they came as additional supplies with a laptop).

Is any of this correct? Either way, that still leaves:

  • B: Bottom? Referring to the shaft length?

  • E: I have no guesses.

  • 4, *12: If R does stand for replacement, the pack came with neither 4, nor 12 screws. It came with 5. There's the possibility that I just wasn't given the original quality from the seller. I have no other guesses what those numbers might stand for.

If it helps, I have 2 other packs of screws, each containing a different string of characters containing R:

  • 8R0*1

  • 4R2*4

Screws in labelled plastic bags

Best Answer

Okay, I read this article, https://en.wikipedia.org/wiki/Part_number , and I did a bunch of measurements and comparisons.

I might not be able to figure it out with 100% confidence, but I feel satisfied with my understanding now.

  • The 6-35 is redundant. A 6 Gauge screw is one that has a head diameter of 3.5 mm.
    • EDIT: Actually, the 35 probably isn't redundant. It's probably referring to the pitch (the distance between each thread)! Thus, the 35 would refer to a 0.35 mm pitch.

  • Some Googling suggests that you're right, @Jeff Cates , about the B: it's the strength/type of the compound.

  • The 20 is the diameter of the shaft (2.0 mm).

  • The 4 is the length of the shaft/screw in mm (whether or not length includes the head depends on the head type).

  • The R stands for Replacement.

  • The *12 is quantity (the company for the screws and the company for the laptops are different, so it's quite likely that the laptop company removes some of the original quantity).

That just leaves the 11 and the E. Considering that B is the compound, I'm inclined to think that 11 is the shaft and/or head model/style. Considering that all packs have a "1" (11, 21, AND 61), and they're all Cross-head, the "1" might refer to a Cross style. As for the E, it might be some sort of personalized/trivial note about the part (e.g. version #).

As for the question about my motive, @jsotola & @Jeff Cates: if I'm going to be working with something, I like to understand deeply how it works. Also, this can help me organize my tools better.

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