Metric bolt replacements

KenTaoyan · 06-11-2023, 11:49 AM

I was wondering where you all find/source bolts that rattle off on the happy trail.

I have a 150cc QIYI coolster quad that a couple of bolts went missing. One bolt in question on the head its printed ZT 8.8

Dr. Google was not much help. Where do you all find (or source/reference) bolt replacements?

zero_dgz · 06-11-2023, 12:48 PM

So, every single fastener I've removed from both of my Chinese bikes has been regular Metric coarse thread. Outside of possibly engine mounts, subframe bolts, footpeg mounts, and axles I don't think the hardness rating of the fasteners you use matters too much.

The "8.8" stamped on the head of your bolt means class 8.8 hardness. You can read more about hardness ratings here:

https://www.engineeringtoolbox.com/s...es-d_1428.html

Hardness determines some of the properties of the bolt including its shear strength, tensile strength, etc.

You can source bolts from any old place; the only requirement is that you get the right size and more importantly thread pitch. I prefer to use stainless hardware which you can either order from specialty bolt suppliers online or just get from the Usual Scumbags on Amazon. Flange head bolts are nice for anywhere that the bolt head will be exposed, because you can capture them on the end of your socket wrench and won't need a washer in most cases.

All of the common fasteners you will find on your bike should be one of these metric sizes:

M4x0.70
M5x0.80 (uncommon, although my RXB has a couple of bodywork screws in this size)
M6x1.0 (the majority of fasteners on the bike for sure)
M8x1.25
M10x1.50

Note that the bolt size describes the diameter of the threaded shank and its thread pitch and has nothing to do with the size of wrench used to remove the bolt.

Megadan · 06-11-2023, 01:57 PM

The handiest thing to keep in your tool box.

https://www.amazon.com/Thread-Checke...hoC9yQQAvD_BwE

J4Fun · 06-11-2023, 03:32 PM

Quote:

Originally Posted by Megadan

The handiest thing to keep in your tool box.

https://www.amazon.com/Thread-Checke...hoC9yQQAvD_BwE

Yep it sure helps with the guessing game…

TominMO · 06-11-2023, 04:06 PM

My go-to is Ace Hardware for most bolt solutions.

Bruces · 06-11-2023, 07:17 PM

There are little kits called “track packs “ ,full of common motorcycle hardware available online and I have a local power sports dealership that sells them ,handy to have and you can carry them with you on the bike ,with a descent assortment of stuff ,and the quality of the ones I can get locally is pretty good .

KenTaoyan · 06-12-2023, 11:06 AM

What it ended up being was M12-1.00 x 30MM

I found something at Autozone that is stronger but longer so I needed to add a few washers.

Life is but a learning experience......

Megadan · 06-12-2023, 04:08 PM

M12 threads? That's a chunky bolt for a small motor

KenTaoyan · 06-13-2023, 02:13 PM

Quad rear axle support. Two bolts rattled off and the chain jumped ship. Easy enough fix but locating the same bolts proved the most challenging. I was temped to drill out the welded nuts and just throw some grade 8 bolts and nuts in.

All is good, thanks for all the help. I am never disappointed on the support from this group.

Oldenslow · 06-13-2023, 09:35 PM

In my dinky little SC town, in the small family-owned century-old hardware store, I have found every metric bolt or nut I have needed on my Chinese and Japanese bikes.

06-11-2023, 11:49 AM	#1
KenTaoyan Join Date: May 2020 Location: Des Moines WA Posts: 82	Metric bolt replacements I was wondering where you all find/source bolts that rattle off on the happy trail. I have a 150cc QIYI coolster quad that a couple of bolts went missing. One bolt in question on the head its printed ZT 8.8 Dr. Google was not much help. Where do you all find (or source/reference) bolt replacements? __________________ ~ toys in the cave (in the order of addition) 81 Honda XL185s {work in progress} 2018 QIYI Coolster 3150CXC 150cc Quad 2019 QIYI Coolster 125cc Quad 2021 Roughhouse 50 (neat little scooter for the wife) 2022 QIYI Coolster 3150DX-4 I may not be fast but I am "Half-Fast"
	0

06-11-2023, 01:57 PM	#3
Megadan Join Date: Apr 2017 Location: Omaha, NE Posts: 8,110	The handiest thing to keep in your tool box. https://www.amazon.com/Thread-Checke...hoC9yQQAvD_BwE __________________ Hawk Information and Resource guide: http://www.chinariders.net/showthread.php?t=20331 2018 Hawk 250 - Full Mod list here. http://www.chinariders.net/showpost....62&postcount=1 2024 Royal Enfield Shotgun 650 https://chinariders.net/showthread.php?t=34124
	4

06-11-2023, 04:06 PM	#5
TominMO Join Date: Sep 2021 Location: De Soto, MO Posts: 1,976	My go-to is Ace Hardware for most bolt solutions. __________________ 2021 Lifan Xpect--sold 2022 Lifan KPX 1972 Honda CT90--The Carrot 1969 Honda CT90--The Tomahto Cheesy is the WDK (workplace drama king). Now retired. Nope, back in the saddle. Nope, finally retired. Climate: The Movie https://www.youtube.com/watch?v=A24fWmNA6lM How our government really works https://www.youtube.com/watch?v=QjadCd0VRBw Question all authority.....think for yourself
	2

06-12-2023, 11:06 AM	#7
KenTaoyan Join Date: May 2020 Location: Des Moines WA Posts: 82	What it ended up being was M12-1.00 x 30MM I found something at Autozone that is stronger but longer so I needed to add a few washers. Life is but a learning experience...... __________________ ~ toys in the cave (in the order of addition) 81 Honda XL185s {work in progress} 2018 QIYI Coolster 3150CXC 150cc Quad 2019 QIYI Coolster 125cc Quad 2021 Roughhouse 50 (neat little scooter for the wife) 2022 QIYI Coolster 3150DX-4 I may not be fast but I am "Half-Fast"
	0

06-12-2023, 04:08 PM	#8
Megadan Join Date: Apr 2017 Location: Omaha, NE Posts: 8,110	M12 threads? That's a chunky bolt for a small motor __________________ Hawk Information and Resource guide: http://www.chinariders.net/showthread.php?t=20331 2018 Hawk 250 - Full Mod list here. http://www.chinariders.net/showpost....62&postcount=1 2024 Royal Enfield Shotgun 650 https://chinariders.net/showthread.php?t=34124
	0

06-11-2023, 12:48 PM	#2
zero_dgz Join Date: Jan 2020 Posts: 281	So, every single fastener I've removed from both of my Chinese bikes has been regular Metric coarse thread. Outside of possibly engine mounts, subframe bolts, footpeg mounts, and axles I don't think the hardness rating of the fasteners you use matters too much. The "8.8" stamped on the head of your bolt means class 8.8 hardness. You can read more about hardness ratings here: https://www.engineeringtoolbox.com/s...es-d_1428.html Hardness determines some of the properties of the bolt including its shear strength, tensile strength, etc. You can source bolts from any old place; the only requirement is that you get the right size and more importantly thread pitch. I prefer to use stainless hardware which you can either order from specialty bolt suppliers online or just get from the Usual Scumbags on Amazon. Flange head bolts are nice for anywhere that the bolt head will be exposed, because you can capture them on the end of your socket wrench and won't need a washer in most cases. All of the common fasteners you will find on your bike should be one of these metric sizes: M4x0.70 M5x0.80 (uncommon, although my RXB has a couple of bodywork screws in this size) M6x1.0 (the majority of fasteners on the bike for sure) M8x1.25 M10x1.50 Note that the bolt size describes the diameter of the threaded shank and its thread pitch and has nothing to do with the size of wrench used to remove the bolt.
	2

06-11-2023, 07:17 PM	#6
Bruces Join Date: May 2018 Posts: 1,650	There are little kits called “track packs “ ,full of common motorcycle hardware available online and I have a local power sports dealership that sells them ,handy to have and you can carry them with you on the bike ,with a descent assortment of stuff ,and the quality of the ones I can get locally is pretty good .
	1

06-13-2023, 02:13 PM	#9
KenTaoyan Join Date: May 2020 Location: Des Moines WA Posts: 82	Quad rear axle support. Two bolts rattled off and the chain jumped ship. Easy enough fix but locating the same bolts proved the most challenging. I was temped to drill out the welded nuts and just throw some grade 8 bolts and nuts in. All is good, thanks for all the help. I am never disappointed on the support from this group. __________________ ~ toys in the cave (in the order of addition) 81 Honda XL185s {work in progress} 2018 QIYI Coolster 3150CXC 150cc Quad 2019 QIYI Coolster 125cc Quad 2021 Roughhouse 50 (neat little scooter for the wife) 2022 QIYI Coolster 3150DX-4 I may not be fast but I am "Half-Fast"
	0

06-13-2023, 09:35 PM	#10
Oldenslow Join Date: Mar 2020 Posts: 153	In my dinky little SC town, in the small family-owned century-old hardware store, I have found every metric bolt or nut I have needed on my Chinese and Japanese bikes.
	0