March 2025 Tip: Milling Machine Arbor and Spindle Tapers

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Milling machine arbor and spindle tapers require a 3 1/2 inch (29.17%) taper per foot. Download and print this handy chart and keep nearby to assist you with frequent tapers.

The arbor taper chart shows dimensions in inches and millimeters for sizes 30, 40, 50, 60 and I, J, K, L, M, N, O, P, Q, R. Standards are not established for metric thread sizes for K.

The spindle taper chart also shows dimensions in inches and millimeters for sizes 30, 40, 50, 60 and A, B, C, D, E, F, G, H. Standards are not established for metric thread sizes for H.


arbor and spindle tapers

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