Subland stepped drill bit DIN 8374, RN-fine, 90° - DRL-STEP-MF-DIN8374RNF-90DGR-HSS-D8,4MM

Subland stepped drill bit DIN 8374, RN-fine, 90°

Name: Subland stepped drill bit DIN 8374, RN-fine, 90°
Brand: Würth
SKU: 5443810605

Subland stepped drill bit HSS DIN 8374 fine 90°
DRL-STEP-MF-DIN8374RNF-90DGR-HSS-D8,4MM

Art.-no. 5443810605

EAN 4062856088553

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Subland stepped drill bit DIN 8374, RN-fine, 90°

Art.-no. 5443810605

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x 1 pcs

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With straight shank for the production of through holes according to ISO 273, while simultaneously producing countersinks (90°) in shape A. The cutting speed depends on the large diameter, the feed on the small diameter.

Product information

Würth Catalogue

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Product code	841
Material to be processed	Steel, Cast metal, Copper, Brass, Aluminium, Plastic
Suitable for screw	M8
Standards	DIN 8374
Cutting material	HSS
Surface	Vaporised
Angle of the tip	118 Degree
Pilot hole diameter (d1)	8.4 mm
Spot-facer diameter (d2)	15.0 mm
Length (l1)	169 mm
Chip flute length (l2)	114 mm
Pilot hole length (l3)	19 mm
Countersink angle	90 Degree
Shank style	Cylindrical
Shank diameter	15 mm
Number of teeth	2 PCS
Coolant supply	External
Tolerance of cutting edge diameter	h8
Tolerance of shank diameter	h8
Type description	Quality grade fine
Material of sub-group	General structural steels, Non-alloyed tempering steels < 1000 N/mm², Alloyed tempering steels < 1000 N/mm², Grey cast iron, Malleable cast iron, Copper, Brass, Aluminium, Plastics

Cutting values for HSS drill bits
For dia. 3.2 to dia. 10.5
Material designation	Tensile strength	v_c		f
		from	to	Dia. 3.2-4.9	Dia. 5-7.9	Dia. 8-10.5
General structural steels	< 500 N/mm²	30	50	0,050	0,120	0,200
General structural steels	500-850 N/mm²	25	35	0,050	0,120	0,200
Carbon steels	< 850 N/mm²	25	35	0,050	0,120	0,200
Carbon steels	850-1000 N/mm²	20	30	0,030	0,070	0,100
Unalloyed heat-treated steels	< 700 N/mm²	25	35	0,030	0,070	0,100
	700-850 N/mm²	20	30	0,030	0,070	0,100
	850-1000 N/mm²	20	25	0,020	0,060	0,090
Alloyed heat-treated steels	850-1000 N/mm²	15	20	0,020	0,050	0,080
Alloyed heat-treated steels	1000-1200 N/mm²	8	12	0,020	0,050	0,080
Unalloyed case-hardening steels	< 750 N/mm²	25	35	0,030	0,070	0,100
Alloyed case-hardening steels	< 1000 N/mm²	15	20	0,020	0,050	0,080
Alloyed case-hardening steels	1000-1200 N/mm²	8	12	0,020	0,050	0,080
Nitriding steels	< 1000 N/mm²	10	15	0,020	0,050	0,080
Nitriding steels	1000-1200 N/mm²	8	12	0,020	0,050	0,080
Tool steels	< 850 N/mm²	10	15	0,020	0,050	0,080
Tool steels	850-1100 N/mm²	8	12	0,020	0,050	0,080
Cast iron	< 180 HB	20	30	0,050	0,120	0,200
Cast iron	> 180 HB	20	30	0,040	0,100	0,160
Nodular graphite, malleable iron	> 180 HB	25	35	0,050	0,120	0,200
Nodular graphite, malleable iron	> 260 HB	18	22	0,040	0,100	0,160
Aluminium, aluminium alloys	< 530 N/mm²	40	100	0,050	0,140	0,180
Aluminium, cast aluminium alloys < 10 % Si	< 600 N/mm²	30	60	0,050	0,140	0,180
Magnesium, magnesium alloys	< 280 N/mm²	40	100	0,050	0,140	0,180
Copper, low-alloy	< 350 N/mm²	35	65	0,050	0,140	0,180
Brass, short-chipping	< 600 N/mm²	60	100	0,080	0,180	0,250
Brass, long-chipping	< 600 N/mm²	35	60	0,050	0,150	0,400
Bronze, short-chipping	< 600 N/mm²	25	50	0,050	0,080	0,140
Bronze, short-chipping	650-850 N/mm²	25	50	0,050	0,080	0,140
Bronze, long-chipping	< 850 N/mm²	15	35	0,050	0,080	0,140
Bronze, long-chipping	850-1200 N/mm²	15	35	0,050	0,080	0,140