E5391/4

BSF Machine Tap Spiral Point
Ordering number: 5976638

Spiral point tap with chamfer form B with a 3.5-5xP second lead, for British Standard Fine thread BSF 1/4" with 26 TPI and Medium class of fit, dimensions according to ISO 529 standard with 6.3mm shank and 5.0mm square drive, HSS with steam tempered surface finish for 2.5xD through hole threading in plain carbon and alloy steel and ferritic and austenitic stainless steel

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Product Feature

Steam Tempered (Steam Oxide) Surface Treatment

Thread Form, British Standard Fine

ISO 529 – Tap Standard

Medium Inch Thread Class of Fit

Through Hole Application

2.5×D Usable Tool Depth to Diameter Ratio

High Speed Steel Tool Material

Plug Tap Chamfer (3.5 – 5 Pitch Lead)

Spiral Point Geometry

Right Hand Rotation / Cutting

Product Detail

Description	Value
Product name	E5391/4
EDP number	0201961
EAN number	7320760201961
Thread diameter size (TDZ)	1/4
Thread diameter - millimeter (TD)	6.35 mm
Threads per inch (TPI)	26
Overall length - millimeter (OAL)	66 mm
Overall length - inch (OAL)	2.5984 inch
Threading length - millimeter (THL)	14 mm
Threading length - inch (THL)	0.5512 inch
Connection diameter - inch (DCON MS)	0.248 inch
Connection diameter - millimeter (DCON MS)	6.3 mm
Flute count (NOF)	3
Usable Length - inch (LU)	1.0236 inch
Usable Length - millimeter (LU)	26 mm
Clamping width - inch (WSC)	0.1969 inch
Clamping width - millimeter (WSC)	5 mm
Premachined hole diameter - inch (PHD)	0.2087 inch
Premachined hole diameter - millimeter (PHD)	5.3 mm
Gross weight - grams	18
ANSI	E5391/4
ISO	E5391/4
Ordering code ANSI	E5391/4

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
P1.1 - Free machining sulfurized carbon steel with a hardness of < 240HB	help_outline Possible use	36 ft/min
P1.2 - Free machining sulfurized and phosphorized carbon steel with a hardness of < 180HB	help_outline Possible use	39 ft/min
P1.3 - Free machining sulfurized/phosphorized and leaded carbon steel with a hardness of < 180HB	help_outline Possible use	46 ft/min

P2

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

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	Suitability	v_c
P2.1 - Plain low carbon steel containing < 0.25%C with a hardness of < 180HB	help_outline Possible use	30 ft/min
P2.2 - Plain medium carbon steel containing < 0.55%C with a hardness of < 240HB	help_outline Possible use	26 ft/min
P2.3 - Plain high carbon steel containing > 0.55%C, with a hardness of < 300HB	help_outline Primary use	23 ft/min

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 Possible use	26 ft/min
P3.2 - Alloy steel with a hardness of 180 - 260HB	help_outline Primary use	20 ft/min

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	16 ft/min
P4.2 - Tool steel with a hardness of 26 - 39RC	help_outline Possible use	13 ft/min

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	23 ft/min
M1.2 - Stainless steel, ferritic with a hardness of 160 - 220HB	help_outline Primary use	20 ft/min

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 Possible use	20 ft/min
M2.2 - Stainless steel, martensitic with a hardness of 200 - 280HB	help_outline Possible use	16 ft/min

M3

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

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	Suitability	v_c
M3.1 - Stainless steel, austenitic with a hardness of < 200HB	help_outline Primary use	16 ft/min
M3.2 - Stainless steel, austenitic with a hardness of 200 - 260HB	help_outline Possible use	13 ft/min
M3.3 - Stainless steel, austenitic with a hardness of 260 - 300HB	help_outline Possible use	10 ft/min

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 Possible use	7 ft/min

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
K1.1 - Gray iron, ferritic or ferritic-pearlitic with a hardness of < 180HB	help_outline Possible use	30 ft/min
K1.2 - Gray iron, ferritic-pearlitic or pearlitic with a hardness of 180 - 240HB	help_outline Possible use	20 ft/min
K1.3 - Gray iron, pearlitic with a hardness of 240 - 280HB	help_outline Possible use	13 ft/min

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 Possible use	39 ft/min
K2.2 - Malleable iron, ferritic or pearlitic with a hardness of 160 - 200HB	help_outline Possible use	30 ft/min

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 Possible use	33 ft/min
K3.2 - Ductile (nodular/spheriodal) iron, ferritic or pearlitic with a hardness of 180 - 220HB	help_outline Possible use	20 ft/min

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	30 ft/min
K4.2 - Austenitic cast iron with a hardness of 180 - 240HB	help_outline Possible use	16 ft/min

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 Possible use	36 ft/min
K5.2 - Vermicular, compacted graphite iron with a hardness of 180 - 220HB	help_outline Possible use	23 ft/min