Metric Sprockets?

[lukevanoort]

I've been looking for some small (tooth counts in the teens) 6.35mm pitch sprockets with an 8mm bore and a 2mm keyway, ideally hubless. I have looked at WM Berg, McMaster-Carr, SDP/SI, Misumi USA, the Robot Marketplace, Small Parts, Motion Industries, MSC, and Grainger; unfortunately, none of them have what I am after (even with hubs). The closest I have found to what I want are the hubless 6.35mm pitch 8mm plain bore sprockets at SDP.

So, anyway, I'm wondering if anyone knows of another place that I've overlooked that might have them, or, if there aren't any available, how realistic it is to file a keyway in one of SDP's sprockets (we lack an arbor press, but have a decent number of freshmen). If it matters, the sprockets would be driven at 0-5.5k rpms and at a maximum torque of ~1.5N-m (although they would usually be operating at much less).