Ondrives 30° gear teeth splines in DIN 5480 - N Internal 9H tolerance - W External 8f tolerance Slide-Fit.We manufacture at our UK factory external and internal our standard range and also for OEM's special designs.We are able to produce in different pressure angles like 37.5° 45° in different fits and diameters. ISO 4156 - ANSI B92.1
See our standard range of products to give you an example of sizes https://ondrives.com/involute-shafts-bushes
You can always email into us your drawings for us to quote to at sales@ondrives.com