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I’m trying to search for this screw but cannot find a comparable head shape. I know it’s an Allen/hex, but I’m talking about the overall shape, it’s like a ‘reverse button-head’, or ‘anti-pan head’?
I have searched Amazon and even google images, but that hasn’t been fruitful.

Excuse the sub-par photograph. I think you can see the shape well enough:

enter image description here

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    They're common on bikes, but I don't know what they're called either
    – Chris H
    Sep 11, 2019 at 10:09
  • I've been looking and I really can't find a source or name. The closest is a flanged button head. I've seen plenty of unusual curved-head screws on bikes, such as button heads with the same size socket normally used for a cap head
    – Chris H
    Sep 11, 2019 at 15:58
  • Same! It’s crazy because I’ve seen them on things like bikes like you say. But not to buy as-is. Super annoying!
    – Ashley Reid
    Sep 11, 2019 at 16:17
  • My last idea is to look at the brand of my old mudguards and see if they're sold as spares, and given a name there. My regular screw suppliers (work) don't do them and more surprisingly I can't find them on ebay
    – Chris H
    Sep 11, 2019 at 16:38
  • I mean, they are not in McMaster Carr either, which is normally my go to for this kind of question. Good idea, or if I can find them on something being sold currently, give them an email? They might be nice to me? Hehe
    – Ashley Reid
    Sep 11, 2019 at 16:41

2 Answers 2

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Taper Head Bolt seems to be the most technical way I can find it referred as. As common, "Water Bottle Cage Bolts" is used.


Taper cap bolt Taper cap bolt


M5x12mm Titanium Hex Key Washer Taper Head Bolt Bike MTB Water Bottle Cage Screw M5x12mm Titanium Hex Key Washer Taper Head Bolt Bike MTB Water Bottle Cage Screw


MCTi Mountain MTB Bike Water Bottle Cage Titanium Allen Hex Tapered Head Bolts Screw M5x12mm Washer Head 4 Packed Colorful MCTi Mountain MTB Bike Water Bottle Cage Titanium Allen Hex Tapered Head Bolts Screw M5x12mm Washer Head 4 Packed Colorful


Bolts & Fasteners 6pcs Titanium Ti Rainbow M5x20 Bolts Allen Hex Tapered Head Screw Bolts & Fasteners 6pcs Titanium Ti Rainbow M5x20 Bolts Allen Hex Tapered Head Screw


Precision Anodized Water Bottle Cage Bolts Precision Anodized Water Bottle Cage Bolts


Titanium M5x12mm with Washers Bicycle Water Bottle Cage Hex Bolts Pack of 4 Titanium M5x12mm with Washers Bicycle Water Bottle Cage Hex Bolts Pack of 4


Alloy Water Bottle Cage Bolts Alloy Water Bottle Cage Bolts

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  • Nice answer, but it needs more photos.
    – rebusB
    Feb 19, 2020 at 16:58
  • @rebusB I tried, but failed to find more examples. :(
    – UnhandledExcepSean
    Feb 19, 2020 at 17:42
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Looks similar to this bicycle bolt.

M5 Black Anodized Bolt Description: Tapered socket head with 4mm broach M5 diameter bolt, 0.8mm thread pitch

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