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Weird Allen bolts?

Old 11-09-18, 06:13 AM
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Weird Allen bolts?

Got a new full/dual suspension mtb and all of the alen bolts are.... odd. i have found that to my releif they are not imperial however they are also not really metric. I have tried both metric and imperial but neither fit and they both wiggle. metric wiggled less a 5mm jiggles around a bit and a 6mm plain does not fit. My biggest concern with using a 5mm alen key is that I do not want to strip the head whilst tightening. Does such a thing as a 5.5mm alen key exist which i am unaware of and does anyboy have any better tips than rubber bands or foil around the alen key head?
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Old 11-09-18, 08:17 AM
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5.5mm allen do exist:https://www.ebay.com/itm/GEDORE-6344...tBuo:rk:2:pf:0
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Old 11-09-18, 08:22 AM
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Replace the bolts with higher quality where possible. It's cheap insurance that you won't strip a bolt head in the future.
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Old 11-09-18, 10:06 AM
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Maybe the OP's hex wrenches are worn.
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Old 11-09-18, 10:17 AM
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Some suspensions use torx bolts, google an image and check against what you have....
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Old 11-09-18, 10:42 AM
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Originally Posted by Trevtassie View Post
Some suspensions use torx bolts, google an image and check against what you have....
Yep, and if they are a bit dirty sometimes it isn’t obvious that they are not plain old Allens.
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Old 11-09-18, 02:59 PM
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What kind of bike do you have?
You could potentially be dealing with Torx bolts or if it is from Wally Mart then it could just be really cheap bolts that don't really mate up to much of anything or were stripped at the factory (or where it was "put together") or your allen keys could be worn out as well. If you are someone who uses allen keys a lot investing in a good set will pay off well and especially avoiding the ball ends for tightening and initial loosening will help.
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Old 11-09-18, 10:09 PM
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Bondhus on a budget, Wera if you've got some extra spending money, and Beta if you are a professional mechanic... Or just have a ton of money to blow.

Anything less expensive than Bondhus is a waste of money.
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Old 11-10-18, 07:02 AM
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Originally Posted by wschruba View Post
Bondhus on a budget, Wera if you've got some extra spending money, and Beta if you are a professional mechanic... Or just have a ton of money to blow.

Anything less expensive than Bondhus is a waste of money.
I would go PB Swiss, multi colored and a favorite amongst pro-mechanics. Our head tech at the shop has two sets and they are quite nice. I also like the Silca tools, one of my customers bought a pump and had me put it together for him and gave me the 6mm that came with it. Gosh, does it feel nice in the hand. Good weight nice texture and a really nice end on it I keep looking for 6mm bolts to tighten.
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Old 11-10-18, 12:48 PM
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I've been working on a '78 Peugeot, and neither of my hex drivers got the stem expander screw. I have both US and Metric sets, neither one fits. It is an irritation. I can sort of get it to tighten, but don't want to overdo it.

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Old 11-10-18, 02:04 PM
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5.5mm allen bolts are more common than you think. A good set of metric allen wrenches will typically have a 5.5mm wrench in it.
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