Subland stepped drill bit, DIN 8378 RN medium, 90°

Name: Subland stepped drill bit, DIN 8378 RN medium, 90°
Brand: Würth
SKU: 5443810201

Subland stepped drill bit HSS DIN 8378 medium 90°
DRL-STEP-MF-DIN8378RNM-90DGR-HSS-D2,5MM

Art.-no. 5443810201

EAN 4062856088225

All versions

Specification

With straight shank for the production of core holes according to DIN 336 part 1, while simultaneously producing free countersinks (90°) according to through holes in line with ISO 273. The cutting speed depends on the large diameter, the feed on the small diameter.

Technical information


Product code	861
Material to be processed	Steel, Cast metal, Copper, Brass, Aluminium, Plastic
Suitable for screw	M3
Standards	DIN 8378
Cutting material	HSS
Surface	Vaporised
Angle of the tip	118 Degree
Pilot hole diameter (d1)	2.5 mm
Spot-facer diameter (d2)	3.4 mm
Length (l1)	70 mm
Chip flute length (l2)	39 mm
Pilot hole length (l3)	8.8 mm
Countersink angle	90 Degree
Shank style	Cylindrical
Shank diameter	3.4 mm
Number of teeth	2 PCS
Coolant supply	External
Tolerance of cutting edge diameter	h8
Tolerance of shank diameter	h8
Type description	Quality grade medium
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. 2.5 to dia. 10.2
Material designation	Tensile strength	v_c		f
		from	to	Dia. 2.5-4.9	Dia. 5-7.9	Dia. 8-10.2
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