EP307/8

UNF Machine Tap Spiral Point
Ordering number: 5973866

Spiral point tap with chamfer form C with a 2-3xP plug lead, for Unified National Fine thread UNF 7/8" with 14 TPI and 2B class of fit, dimensions according to DIN 2184-1 standard with 18.0mm shank and 14.5mm square drive, powder metallurgical HSS-E with bright finish for 2.5xD through hole threading in free machining and plain carbon steel and wrought or cast aluminium and copper or copper alloys

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Product Feature

Bright (uncoated)

Thread Form, Unified Fine

DIN 2184-1 – Tap Standard

Internal Inch Thread Medium Class of Fit

Through Hole Application

2.5×D Usable Tool Depth to Diameter Ratio

High Speed Cobalt Powder Metal Tool Material

Semi-Bottoming Tap Chamfer (2 – 3 Pitch Lead)

Spiral Point Geometry

Right Hand Rotation / Cutting

Product Detail

Description	Value
Product name	EP307/8
EDP number	0138458
EAN number	7320760138458
Thread diameter size (TDZ)	7/8
Thread diameter - millimeter (TD)	22.225 mm
Threads per inch (TPI)	14
Overall length - millimeter (OAL)	140 mm
Overall length - inch (OAL)	5.5118 inch
Threading length - millimeter (THL)	34 mm
Threading length - inch (THL)	1.3386 inch
Connection diameter - inch (DCON MS)	0.7087 inch
Connection diameter - millimeter (DCON MS)	18 mm
Flute count (NOF)	4
Tolerance limit	H6
Clamping width - inch (WSC)	0.5709 inch
Clamping width - millimeter (WSC)	14.5 mm
Clamping Length - inch (LCS)	0.6693 inch
Clamping Length - millimeter (LSC)	17 mm
Premachined hole diameter - inch (PHD)	0.8031 inch
Premachined hole diameter - millimeter (PHD)	20.4 mm
Gross weight - grams	276.4
ANSI	EP307/8
ISO	EP307/8
Ordering code ANSI	EP307/8

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 Primary use	72 ft/min
P1.2 - Free machining sulfurized and phosphorized carbon steel with a hardness of < 180HB	help_outline Primary use	79 ft/min
P1.3 - Free machining sulfurized/phosphorized and leaded carbon steel with a hardness of < 180HB	help_outline Primary use	82 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 Primary use	59 ft/min
P2.2 - Plain medium carbon steel containing < 0.55%C with a hardness of < 240HB	help_outline Primary use	52 ft/min
P2.3 - Plain high carbon steel containing > 0.55%C, with a hardness of < 300HB	help_outline Possible use	46 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 Primary use	43 ft/min
P3.2 - Alloy steel with a hardness of 180 - 260HB	help_outline Possible use	33 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 Possible use	26 ft/min

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

N1

N1 - Wrought aluminium

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	Suitability	v_c
N1.1 - Pure aluminium and wrought aluminium alloys with a hardness of < 60HB	help_outline Primary use	46 ft/min
N1.2 - Wrought aluminium alloys with a hardness of 60 - 100HB	help_outline Primary use	33 ft/min
N1.3 - Wrought aluminium alloys with a hardness of 100 - 150HB	help_outline Primary use	23 ft/min

N2

N2 - Cast aluminium

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	Suitability	v_c
N2.1 - Cast aluminium alloys with a hardness of < 75HB	help_outline Primary use	92 ft/min
N2.2 - Cast aluminium alloys with a hardness of 75 - 90HB	help_outline Primary use	82 ft/min
N2.3 - Cast aluminium alloys with a hardness of 90 < 140HB	help_outline Primary use	59 ft/min

N3

N3 - Copper or copper alloys

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	Suitability	v_c
N3.1 - Free-cutting copper-alloys materials with excellent machining properties	help_outline Primary use	144 ft/min
N3.2 - Short-chip copper-alloys with good to moderate machining properties	help_outline Possible use	89 ft/min
N3.3 - Electrolytic copper and long-chip copper-alloys with moderate to poor machining properties	help_outline Primary use	43 ft/min

N4

N4 - Polymers(synthetic or semi-synthetic materials)

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	Suitability	v_c	f
N4.1 - Thermoplastic polymers	help_outline Possible use	72 ft/min