Meaning of designation sample:End mill DIN 844 - A 20 L - LL - M - N - R10 - h6 - Z6 - HSS

Name and number of standard: end mill DIN 844
Type of shank [A, B, C, D lub F]: A
Nominal diameter: 20
Length of cut variation: K-short, L-long: L
Direction of cut and helix (optional - lack means [RR] option): LL
Center cutting [M] (optional - lack means face with deepening):M

Description and usage of end mill:
N - standard profile of tooth universal for steels: constructional, for carbonishing, toughening of strength up to 1000 N/mm2 as well as non-metals. NS- option with chip breakers on customers request.

NR - rounded profile of tooth, destined for rough machining materials of standard strength. Appearing chip is short; the obtained surface does require always additional machining.

NRf - Rounded fine tooth profile destined for rough machining materials of higher strength. Appearing chip is short; the obtained surface does not require usually additional machining.

NF - flat tooth profile destined for rough machining materials of standard strength. Appearing chip is short; the obtained surface does not required usually any additional machining.

W - destined for finishing machining of materials: soft, expanding, of long chip. Obtined surface does not require any additional machining.

H - increased number of teeth on perimeter, destined for finishing machining of difficult machining materials of strength 1200 N/mm2, as well as titanium alloys, ductile cast iron etc. (helix angle - 40..55o)

Radius of corners rounding (optional lack means flat nosed): R10
Tolerance of shank diameter (optional): h6
Number of flutes (given optionally when is other than declared in catalogue): Z6
Symbol of working part material: HSS or HSS-E and type of coating.