SC twist drill bit DIN 6537K - DRL-TWST-DIN6537K-HS-IC-SC-TNS-HA-D6,8MM

SC twist drill bit DIN 6537K

Name: SC twist drill bit DIN 6537K
Brand: Würth
SKU: 5443002485

Twist drill SD DIN6537K type H TiAlN-S UHS
DRL-TWST-DIN6537K-HS-IC-SC-TNS-HA-D6,8MM

Art.-no. 5443002485

EAN 4055375916230

All versions

Specification

Especially for machining high-strength and hardened steels up to 68 HRC. Very high stability and low wear owing to convex blade geometry. Special grinding ensures optimal chip breakage, high centring accuracy and low cutting forces.

Technical information


Product code	6857
Material to be processed	Cast metal, Hard and tough material
Standards	DIN 6537
Design	Short
Surface	TiAlN-S
Max. drilling depth (D)	3xD
Cutting material	SC
Number of guiding chamfers	2 PCS
Angle of the tip	140 Degree
Number of cutting edges	2 PCS
Coolant supply	External
Diameter (d1)	6.8 mm
Shank style	Cylindrical DIN 6535-HA
Length (l1)	79 mm
Chip flute length (l2)	34 mm
Tolerance of cutting edge diameter	h7
Shank diameter (d2)	8 mm
Tolerance of shank diameter	h6
Material of sub-group	Nitriding steels < 1300 N/mm², Grey cast iron, Malleable cast iron, Steels > 45 HRC

Cutting values for solid carbide high-performance drill Speeddrill, Ultra Hard Steel, 68HRC 3xd without internal cooling
For dia. 3 to dia. 8.9
Material designation	Tensile strength	Cooling	v_c	f
				Dia. 3 to dia. 5.9	Dia. 6 to dia. 8.9
General structural steels	< 500 N/mm²	E	80	0,180	0,240
General structural steels	500-850 N/mm²	E	70	0,180	0,240
Carbon steels	< 850 N/mm²	E	80	0,180	0,240
Carbon steels	850-1000 N/mm²	E	70	0,180	0,240
Unalloyed heat-treated steels	< 700 N/mm²	E	65	0,150	0,210
	700-850 N/mm²	E	65	0,150	0,210
	850-1000 N/mm²	E	65	0,150	0,210
Alloyed heat-treated steels	850-1000 N/mm²	E	65	0,150	0,210
Alloyed heat-treated steels	1000-1200 N/mm²	E	50	0,150	0,210
Unalloyed case-hardening steels	< 750 N/mm²	E	75	0,180	0,240
Alloyed case-hardening steels	< 1000 N/mm²	E	70	0,180	0,240
Alloyed case-hardening steels	1000-1200 N/mm²	E	65	0,160	0,220
Nitriding steels	< 1000 N/mm²		65	0,150	0,210
Nitriding steels	1000-1200 N/mm²	E	65	0,150	0,210
Tool steels	< 850 N/mm²	E	50	0,150	0,210
Tool steels	850-1100 N/mm²	E	50	0,150	0,210
Hardened steels	40-48 HRC	E	28	0,080	0,090
	48-55 HRC	E	20	0,080	0,090
	55-60 HRC	E	16	0,080	0,090
	60-68 HRC	E	10	0,080	0,090
Spring steels	< 1200 N/mm²	E	40	0,150	0,210
Cast iron	< 180 HB	T/E	75	0,230	0,340
Cast iron	> 180 HB	T/E	70	0,230	0,340
Nodular graphite, malleable iron	> 180 HB	E	75	0,200	0,250
Nodular graphite, malleable iron	> 260 HB	E	70	0,200	0,250

Legend
T = dry
E = emulsion
v_c = cutting speed [m/min]
f = feed [mm/r]
The suggested cutting values are reference values and must be adapted to the respective conditions.

Cutting values for solid carbide high-performance drill Speeddrill, Ultra Hard Steel, 68HRC 3xd without internal cooling
For dia. 9 to dia. 16
Material designation	Tensile strength	Cooling	v_c	f
				Dia. 9 to dia. 11.9	Dia. 12 to dia. 16
General structural steels	< 500 N/mm²	E	80	0,300	0,350
General structural steels	500-850 N/mm²	E	70	0,300	0,350
Carbon steels	< 850 N/mm²	E	80	0,300	0,350
Carbon steels	850-1000 N/mm²	E	70	0,300	0,350
Unalloyed heat-treated steels	< 700 N/mm²	E	65	0,270	0,320
	700-850 N/mm²	E	65	0,270	0,320
	850-1000 N/mm²	E	65	0,270	0,320
Alloyed heat-treated steels	850-1000 N/mm²	E	65	0,270	0,320
Alloyed heat-treated steels	1000-1200 N/mm²	E	50	0,270	0,320
Unalloyed case-hardening steels	< 750 N/mm²	E	75	0,300	0,350
Alloyed case-hardening steels	< 1000 N/mm²	E	70	0,300	0,350
Alloyed case-hardening steels	1000-1200 N/mm²	E	65	0,280	0,340
Nitriding steels	< 1000 N/mm²		65	0,270	0,320
Nitriding steels	1000-1200 N/mm²	E	65	0,270	0,320
Tool steels	< 850 N/mm²	E	50	0,270	0,320
Tool steels	850-1100 N/mm²	E	50	0,270	0,320
Hardened steels	40-48 HRC	E	28	0,110	0,130
	48-55 HRC	E	20	0,110	0,130
	55-60 HRC	E	16	0,110	0,130
	60-68 HRC	E	10	0,110	0,130
Spring steels	< 1200 N/mm²	E	40	0,270	0,320
Cast iron	< 180 HB	T/E	75	0,430	0,520
Cast iron	> 180 HB	T/E	70	0,430	0,520
Nodular graphite, malleable iron	> 180 HB	E	75	0,350	0,400
Nodular graphite, malleable iron	> 260 HB	E	70	0,350	0,400