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NMTB Taper Specifications

40 Taper N40-PC4-3 shown here. (Relief groove on 40 & 50 taper only.) [+]

Click to Enlarge [+]

Meets or exceeds ANSI B5-18 specifications.
Taper is toleranced so that any error increases rate of taper only. Refer to Manufacturing Specifications for tolerance specifications.
Parlec provides tooling in a variety of taper styles including BT, V-Flange, ISO 7388 (DIN NOTCH), ISO 7388/1 (DIN 69871/B), Morse, Automotive, Kearney and Trecker, Sundstrand, and others upon request.
Erickson quick-change spindle qualified.
Refer to Manufacturing Specifications for taper accuracies.

Taper Type	Gageline D1	D2	L1	L2	L3	L4	L5	L6	Thread
N30	1.250	1.825	2.687	0.344	0.421	0.905	0.640	0.645	1/2 – 13
N40	1.750	2.500	3.687	0.312	0.389	0.956	0.883	0.645	5/8 – 11
N50	2.750	3.900	5.000	0.640	0.765	1.000	1.382	1.013	1 – 8