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I really want to know where you're finding SAE fasteners on bicycles -- nothing made in the last 40-50 years (with the exception of a niche BMX company) has used those dimensions. Even in the halcyon days of Schwinn they primarily used metric fasteners. I wonder if you're working on old British...

Call Park and Truman/Calvin will get you a new one -- they had problems with third-party heat treat and the first six or so months of production were underhardened. I've had the same kit in use for 6 months with no burrs raised on the shaft after replacement. Regarding current Park hex stock...

@RoninB4 With regard to ball hex neck thickness, access angles, and the availability of double-ball hex keys, the usage of these tools has evolved since they became widely available. Some ball designs (e.g. Wera) are explicitly designed to have more contact area than predecessors, as in the...

That is very interesting. The Kleins are definitely made in Slovenia as can be seen on their Zoro listings. I wonder if those Inbus are produced under license using the same molds designed by Unior. For reference, check out the original Unior design.

If you want metric ball hex made in the USA, with Bondhus-supplied hex stock, Park Tool makes a similar tool (in fact, they originated the style that Unior imitates) as their 'P-handles,' which are a go-to tool in the bicycle world. Note that these use a hard nylon handle instead of the...

Those Klein are made in Slovenia by Unior, and are extremely high quality. That being said, if you want US-made it's hard to go wrong with Bondhus.