G57020.5

Countersink - 90°
Ordering number: 6381765

Countersink with 3-flutes, 90° chamfering angle, maximum diameter 20.50mm with an overall length of 63mm and a head length of 17.1mm and 10mm straight shank, according to DIN 335 C standard to produce a conical seat for ISO Metric countersunk-head screws with a minium hole diameter of 3.50mm, cobalt based HSS-E with standard AlTiCN coating for machining alloy and tool steel, ferritic, martensitic and austenitic stainless steel and grey, malleable, ductile and compacted graphite cast-iron

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Product Feature

Aluminium Titanium Carbon Nitride Coating

High Speed Cobalt Steel Tool Material

DIN 335 C – Straight Shank Countersink Standards

Right Hand Rotation / Cutting

90° Countersink

Cylindrical Shank / Straight Shank

Product Detail

Description	Value
EAN number	7320760669044
EDP number	46381765
Product name	G57020.5
Ordering code ANSI	G57020.5
Gross weight - grams	54.7
Cutting diameter second cutting step - millimeters (DC_2)	20.5 mm
Cutting diameter step - millimeter	3.5 mm
Length chip flute - millimeter (LCF)	17.1 mm
Overall length - millimeter (OAL)	63 mm
Connection diameter - millimeter (DCON MS)	10 mm
Flute count (NOF)	3
ANSI	G57020.5
ISO	G57020.5

Cutting Conditions

P - Steel and cast steel (steels with alloy content ≤ 10% and a hardness of < 45HRC)

P1

P1 - Free machining steel (carbon steels with increased machinability)

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	Suitability	v_c	f
P1.1 - Free machining sulfurized carbon steel with a hardness of < 240HB	help_outline Possible use	131 ft/min	0.0079 inch/rev
P1.2 - Free machining sulfurized and phosphorized carbon steel with a hardness of < 180HB	help_outline Possible use	148 ft/min	0.0079 inch/rev
P1.3 - Free machining sulfurized/phosphorized and leaded carbon steel with a hardness of < 180HB	help_outline Possible use	151 ft/min	0.0079 inch/rev

P2

P2 - Plain carbon steel (steels comprised of mainly iron and carbon)

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	Suitability	v_c	f
P2.1 - Plain low carbon steel containing < 0.25%C with a hardness of < 180HB	help_outline Possible use	112 ft/min	0.0079 inch/rev
P2.2 - Plain medium carbon steel containing < 0.55%C with a hardness of < 240HB	help_outline Possible use	98 ft/min	0.0071 inch/rev
P2.3 - Plain high carbon steel containing > 0.55%C, with a hardness of < 300HB	help_outline Primary use	89 ft/min	0.0047 inch/rev

P3

P3 - Alloy steel (carbon steels with an alloying content ≤ 10%)

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	Suitability	v_c	f
P3.1 - Alloy steel with a hardness of < 180HB	help_outline Primary use	92 ft/min	0.0071 inch/rev
P3.2 - Alloy steel with a hardness of 180 - 260HB	help_outline Primary use	72 ft/min	0.0071 inch/rev
P3.3 - Alloy steel with a hardness of 260 - 360HB	help_outline Primary use	62 ft/min	0.0047 inch/rev

P4

P4 - Tool steel (special alloy steel for tools, dies and molds)

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	Suitability	v_c	f
P4.1 - Tool steel with a hardness of < 26HRC	help_outline Primary use	52 ft/min	0.0071 inch/rev
P4.2 - Tool steel with a hardness of 26 - 39RC	help_outline Primary use	46 ft/min	0.0047 inch/rev
P4.3 - Tool steel with a hardness of 39 - 45HRC	help_outline Possible use	36 ft/min	0.0047 inch/rev

M - Stainless steel (corrosion resistant steels with ≥ 11% chromium content)

M1

M1 - Ferritic stainless steel (straight chromium non-hardenable alloys)

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	Suitability	v_c	f
M1.1 - Stainless steel, ferritic with a hardness of < 160HB	help_outline Primary use	75 ft/min	0.0055 inch/rev
M1.2 - Stainless steel, ferritic with a hardness of 160 - 220HB	help_outline Primary use	66 ft/min	0.0055 inch/rev

M2

M2 - Martensitic stainless steel (straight chromium hardenable alloys)

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	Suitability	v_c	f
M2.1 - Stainless steel, martensitic with a hardness of < 200HB	help_outline Primary use	69 ft/min	0.0055 inch/rev
M2.2 - Stainless steel, martensitic with a hardness of 200 - 280HB	help_outline Primary use	56 ft/min	0.0055 inch/rev
M2.3 - Stainless steel, martensitic with a hardness of 280 - 380HB	help_outline Possible use	46 ft/min	0.0035 inch/rev

M3

M3 - Austenitic stainless steel (chromium-nickel and chromium-nickel-manganese alloys)

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	Suitability	v_c	f
M3.1 - Stainless steel, austenitic with a hardness of < 200HB	help_outline Primary use	46 ft/min	0.0047 inch/rev
M3.2 - Stainless steel, austenitic with a hardness of 200 - 260HB	help_outline Primary use	39 ft/min	0.0047 inch/rev
M3.3 - Stainless steel, austenitic with a hardness of 260 - 300HB	help_outline Possible use	36 ft/min	0.0047 inch/rev

M4

M4 - Super-austenitic, Duplex or Precipitation Hardening stainless steel (austenitic alloys with > 20% Ni, austenitic-ferritic microstructure or precipitation hardened)

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	Suitability	v_c	f
M4.1 - Stainless steel, austenitic-ferritic or super-austenitic with a hardness of < 300HB	help_outline Primary use	49 ft/min	0.0035 inch/rev
M4.2 - Stainless steel, precipitation hardening austenitic with a hardness of 300 - 380HB	help_outline Possible use	43 ft/min	0.0035 inch/rev

K - Cast Iron (castings of iron and carbon alloys with > 2% carbon content)

K1

K1 - Gray iron (GG) (iron-carbon castings with a lamellar graphite microstructure)

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	Suitability	v_c	f
K1.1 - Gray iron, ferritic or ferritic-pearlitic with a hardness of < 180HB	help_outline Primary use	135 ft/min	0.0055 inch/rev
K1.2 - Gray iron, ferritic-pearlitic or pearlitic with a hardness of 180 - 240HB	help_outline Primary use	98 ft/min	0.0055 inch/rev
K1.3 - Gray iron, pearlitic with a hardness of 240 - 280HB	help_outline Possible use	75 ft/min	0.0055 inch/rev

K2

K2 - Malleable iron (GTS/GTW) (heat-treated iron-carbon castings with a graphite-free microstructure)

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	Suitability	v_c	f
K2.1 - Malleable iron, ferritic with a hardness of < 160HB	help_outline Primary use	138 ft/min	0.0055 inch/rev
K2.2 - Malleable iron, ferritic or pearlitic with a hardness of 160 - 200HB	help_outline Primary use	112 ft/min	0.0055 inch/rev
K2.3 - Malleable iron, pearlitic with a hardness of 200 - 240HB	help_outline Possible use	89 ft/min	0.0055 inch/rev

K3

K3 - Ductile iron (GGG) (iron-carbon castings with a nodular graphite microsturcture)

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	Suitability	v_c	f
K3.1 - Ductile (nodular/spheriodal) iron, ferritic with a hardness of < 180HB	help_outline Primary use	121 ft/min	0.0055 inch/rev
K3.2 - Ductile (nodular/spheriodal) iron, ferritic or pearlitic with a hardness of 180 - 220HB	help_outline Primary use	92 ft/min	0.0055 inch/rev
K3.3 - Ductile (nodular/spheriodal) iron, pearlitic with a hardness of 220 - 260HB	help_outline Possible use	75 ft/min	0.0055 inch/rev

K4

K4 - Austenitic or austempered ductile iron (Ni-Resist/ADI) (iron-carbon alloy castings with an austenitic or ausferrite microstructure)

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	Suitability	v_c	f
K4.1 - Austenitic cast iron with a hardness of < 180HB	help_outline Possible use	112 ft/min	0.0055 inch/rev
K4.2 - Austenitic cast iron with a hardness of 180 - 240HB	help_outline Possible use	85 ft/min	0.0055 inch/rev
K4.3 - Austempered ductile iron with a hardness of 240 - 280HB	help_outline Possible use	62 ft/min	0.0055 inch/rev

K5

K5 - Compacted graphite iron (CGI) (iron-carbon castings with a vermicular graphite structure)

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	Suitability	v_c	f
K5.1 - Vermicular, compacted graphite iron with a hardness of < 180HB	help_outline Primary use	128 ft/min	0.0055 inch/rev
K5.2 - Vermicular, compacted graphite iron with a hardness of 180 - 220HB	help_outline Primary use	95 ft/min	0.0055 inch/rev
K5.3 - Vermicular, compacted graphite iron with a hardness of 220 - 260HB	help_outline Possible use	75 ft/min	0.0055 inch/rev

N - Non-ferrous metals (metals including alloys without an appreciable amount of iron)

N1

N1 - Wrought aluminium

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	Suitability	v_c	f
N1.1 - Pure aluminium and wrought aluminium alloys with a hardness of < 60HB	help_outline Possible use	197 ft/min	0.0087 inch/rev
N1.2 - Wrought aluminium alloys with a hardness of 60 - 100HB	help_outline Possible use	148 ft/min	0.0087 inch/rev
N1.3 - Wrought aluminium alloys with a hardness of 100 - 150HB	help_outline Possible use	98 ft/min	0.0083 inch/rev

N2

N2 - Cast aluminium

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	Suitability	v_c	f
N2.1 - Cast aluminium alloys with a hardness of < 75HB	help_outline Possible use	98 ft/min	0.0083 inch/rev
N2.2 - Cast aluminium alloys with a hardness of 75 - 90HB	help_outline Possible use	89 ft/min	0.0083 inch/rev
N2.3 - Cast aluminium alloys with a hardness of 90 < 140HB	help_outline Possible use	62 ft/min	0.0083 inch/rev

N3

N3 - Copper or copper alloys

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	Suitability	v_c	f
N3.1 - Free-cutting copper-alloys materials with excellent machining properties	help_outline Possible use	105 ft/min	0.0083 inch/rev
N3.2 - Short-chip copper-alloys with good to moderate machining properties	help_outline Possible use	59 ft/min	0.0083 inch/rev
N3.3 - Electrolytic copper and long-chip copper-alloys with moderate to poor machining properties	help_outline Possible use	30 ft/min	0.0071 inch/rev