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

<p><BR>Taper cap bolt
<a href="https://i.sstatic.net/kW0Pq.jpg" rel="nofollow noreferrer"><img src="https://i.sstatic.net/kW0Pq.jpg" alt="Taper cap bolt"></a></p>

<p><BR>M5x12mm Titanium Hex Key Washer Taper Head Bolt Bike MTB Water Bottle Cage Screw
<a href="https://i.sstatic.net/KOfdn.jpg" rel="nofollow noreferrer"><img src="https://i.sstatic.net/KOfdn.jpg" alt="M5x12mm Titanium Hex Key Washer Taper Head Bolt Bike MTB Water Bottle Cage Screw"></a></p>

<p><BR>MCTi Mountain MTB Bike Water Bottle Cage Titanium Allen Hex Tapered Head Bolts Screw M5x12mm Washer Head 4 Packed Colorful
<a href="https://i.sstatic.net/ChEYn.jpg" rel="nofollow noreferrer"><img src="https://i.sstatic.net/ChEYn.jpg" alt="MCTi Mountain MTB Bike Water Bottle Cage Titanium Allen Hex Tapered Head Bolts Screw M5x12mm Washer Head 4 Packed Colorful"></a></p>

<p><BR>Bolts &amp; Fasteners 6pcs Titanium Ti Rainbow M5x20 Bolts Allen Hex Tapered Head Screw
<a href="https://i.sstatic.net/BSDgN.jpg" rel="nofollow noreferrer"><img src="https://i.sstatic.net/BSDgN.jpg" alt="Bolts &amp; Fasteners 6pcs Titanium Ti Rainbow M5x20 Bolts Allen Hex Tapered Head Screw"></a></p>

<p><BR>Precision Anodized Water Bottle Cage Bolts
<a href="https://i.sstatic.net/0M81U.jpg" rel="nofollow noreferrer"><img src="https://i.sstatic.net/0M81U.jpg" alt="Precision Anodized Water Bottle Cage Bolts"></a></p>

<p><BR>Titanium M5x12mm with Washers Bicycle Water Bottle Cage Hex Bolts Pack of 4
<a href="https://i.sstatic.net/Mnkur.jpg" rel="nofollow noreferrer"><img src="https://i.sstatic.net/Mnkur.jpg" alt="Titanium M5x12mm with Washers Bicycle Water Bottle Cage Hex Bolts Pack of 4"></a></p>

<p><BR>Alloy Water Bottle Cage Bolts
<a href="https://i.sstatic.net/NXg2e.jpg" rel="nofollow noreferrer"><img src="https://i.sstatic.net/NXg2e.jpg" alt="Alloy Water Bottle Cage Bolts"></a></p>

CC BY-SA 4.0
2020-02-19T16:58:51.367Z
Nice answer, but it needs more photos.
rebusB
CC BY-SA 4.0
2020-02-19T17:42:43.840Z
@rebusB I tried, but failed to find more examples. :(
UnhandledExcepSean
CC BY-SA 4.0
2020-02-06T01:49:23.723Z
2020-02-06T01:49:23.723Z
UnhandledExcepSean
<p>Looks similar to this
<a href="https://i.sstatic.net/8ctX9.jpg" rel="nofollow noreferrer"><img src="https://i.sstatic.net/8ctX9.jpg" alt="bicycle bolt."></a></p>

<p><a href="https://www.performancebike.com/dimension-black-anodized-bolt-bo0000000312/p541014" rel="nofollow noreferrer">M5 Black Anodized Bolt</a>
Description:
Tapered socket head with 4mm broach M5 diameter bolt, 0.8mm thread pitch</p>

CC BY-SA 4.0
2019-09-18T11:14:56.843Z
And yet every other hit I've seen for "tapered socket head" is for a more conical shape e.g. https://www.pro-bolt.com/stainless/stainless-steel-bolts-tapered-socket-cap.html
Chris H
CC BY-SA 4.0
2019-09-18T13:30:36.780Z
Yeah, think it’s a bicycle thing.
Andrew Richmond
CC BY-SA 4.0
2019-09-18T00:38:42.503Z
2019-09-18T00:38:42.503Z
Andrew Richmond
<p>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’?<br>
I have searched Amazon and even google images, but that hasn’t been fruitful. </p>

<p>Excuse the sub-par photograph. I <em>think</em> you can see the shape well enough:</p>

<p><a href="https://i.sstatic.net/aOVFs.jpg" rel="noreferrer"><img src="https://i.sstatic.net/aOVFs.jpg" alt="enter image description here"></a></p>

CC BY-SA 4.0
2019-09-11T10:09:21.287Z
They're common on bikes, but I don't know what they're called either
Chris H
CC BY-SA 4.0
2019-09-11T15:58:10.970Z
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
CC BY-SA 4.0
2019-09-11T16:17:15.903Z
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
CC BY-SA 4.0
2019-09-11T16:38:54.623Z
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
CC BY-SA 4.0
2019-09-11T16:41:54.470Z
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
CC BY-SA 4.0
2019-09-11T16:51:17.623Z
The ones I've got were fitted to my genesis bike when I bought it new. On an unrelated issue they weren't very helpful
Chris H
CC BY-SA 4.0
2019-09-12T12:51:48.897Z
I've found a product photo with them in, a spares kit for [Norco suspension](https://www.evanscycles.com/norco-2013-sight-upper-shock-pivot-bolt-EV195729).  I've come to suspect that as they're functionally the same as flanged buttonheads, the difference is one of styling and there may be no standard term.  I haven't exactly given up but I've run out of idea for now (no branding on the surviving bits of my old back mudguard)
Chris H
<tool-identification>
What type of screw head shape is this?
Ashley Reid
# What type of screw head shape is this?

(Asked by: username_0 on 2019-09-10)

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](https://i.sstatic.net/aOVFs.jpg)](https://i.sstatic.net/aOVFs.jpg)

**Tags:** tool-identification

> **Comments:**
> **username_1**: They're common on bikes, but I don't know what they're called either  
> **username_1**: 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  
> **username_0**: Same! It’s crazy because I’ve seen them on things like bikes like you say. But not to buy as-is. Super annoying!  
> **username_1**: 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  
> **username_0**: 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  
> **username_1**: The ones I've got were fitted to my genesis bike when I bought it new. On an unrelated issue they weren't very helpful  
> **username_1**: I've found a product photo with them in, a spares kit for [Norco suspension](https://www.evanscycles.com/norco-2013-sight-upper-shock-pivot-bolt-EV195729).  I've come to suspect that as they're functionally the same as flanged buttonheads, the difference is one of styling and there may be no standard term.  I haven't exactly given up but I've run out of idea for now (no branding on the surviving bits of my old back mudguard)  

---

## 2 answers

### Answer by username_2 on 2020-02-06. Score: 3

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](https://i.sstatic.net/kW0Pq.jpg)](https://i.sstatic.net/kW0Pq.jpg)

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](https://i.sstatic.net/KOfdn.jpg)](https://i.sstatic.net/KOfdn.jpg)

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](https://i.sstatic.net/ChEYn.jpg)](https://i.sstatic.net/ChEYn.jpg)

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](https://i.sstatic.net/BSDgN.jpg)](https://i.sstatic.net/BSDgN.jpg)

Precision Anodized Water Bottle Cage Bolts
[![Precision Anodized Water Bottle Cage Bolts](https://i.sstatic.net/0M81U.jpg)](https://i.sstatic.net/0M81U.jpg)

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](https://i.sstatic.net/Mnkur.jpg)](https://i.sstatic.net/Mnkur.jpg)

Alloy Water Bottle Cage Bolts
[![Alloy Water Bottle Cage Bolts](https://i.sstatic.net/NXg2e.jpg)](https://i.sstatic.net/NXg2e.jpg)

> **Comments:**
> **username_3**: Nice answer, but it needs more photos.  
> **username_2**: @username_3 I tried, but failed to find more examples. :(  

---

### Answer by username_4 on 2019-09-18. Score: 2

Looks similar to this
[![bicycle bolt.](https://i.sstatic.net/8ctX9.jpg)](https://i.sstatic.net/8ctX9.jpg)

[M5 Black Anodized Bolt](https://www.performancebike.com/dimension-black-anodized-bolt-bo0000000312/p541014)
Description:
Tapered socket head with 4mm broach M5 diameter bolt, 0.8mm thread pitch

> **Comments:**
> **username_1**: And yet every other hit I've seen for "tapered socket head" is for a more conical shape e.g. https://www.pro-bolt.com/stainless/stainless-steel-bolts-tapered-socket-cap.html  
> **username_4**: Yeah, think it’s a bicycle thing.  

---

