Bright (uncoated)
E0257/16
UNC Machine Tap Spiral Point
Ordering number: 5974060
Spiral point tap with chamfer form B with a 3.5-5xP second lead, for Unified National Coarse thread UNC 7/16" with 14 TPI and 3B class of fit with H3 pitch diameter limits, dimensions according to ANSI standard with 0.3230" shank and 0.2420" 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
Product Feature
Thread Form, Unified Coarse
ANSI – Tap Standards
Thread tolerance class 3B
Through Hole Application
2.5×D Usable Tool Depth to Diameter Ratio
High Speed Cobalt Powder Metal Tool Material
Plug Tap Chamfer (3.5 – 5 Pitch Lead)
Spiral Point Geometry
Right Hand Rotation / Cutting
Product Detail
Description | Value |
|---|---|
| Product name | E0257/16 |
| EDP number | 0581179 |
| EAN number | 7320760581179 |
| Thread diameter size (TDZ) | 7/16 |
| Threads per inch (TPI) | 14 |
| Overall length - millimeter (OAL) | 80.17 mm |
| Overall length - inch (OAL) | 3.1563 inch |
| Overall length - fractional inch (OAL) | 3.5/32 |
| Threading length - millimeter (THL) | 23 mm |
| Threading length - inch (THL) | 0.9055 inch |
| Connection diameter - inch (DCON MS) | 0.323 inch |
| Connection diameter - millimeter (DCON MS) | 8.2 mm |
| Flute count (NOF) | 3 |
| Tolerance limit | H3 |
| Clamping width - inch (WSC) | 0.242 inch |
| Clamping width - millimeter (WSC) | 6.15 mm |
| Premachined hole diameter - imperial (PHD) | U |
| Premachined hole diameter - inch (PHD) | 0.3701 inch |
| Premachined hole diameter - millimeter (PHD) | 9.4 mm |
| Gross weight - grams | 39.8 |
| ANSI | E0257/16 |
| ISO | E0257/16 |
| Ordering code ANSI | E0257/16 |
Cutting Conditions
| Suitability | vc | f | |
|---|---|---|---|
| P1.1 - Free machining sulfurized carbon steel with a hardness of < 240HB | Primary use | 72 ft/min | |
| P1.2 - Free machining sulfurized and phosphorized carbon steel with a hardness of < 180HB | Primary use | 79 ft/min | |
| P1.3 - Free machining sulfurized/phosphorized and leaded carbon steel with a hardness of < 180HB | Primary use | 82 ft/min |
| Suitability | vc | f | |
|---|---|---|---|
| P2.1 - Plain low carbon steel containing < 0.25%C with a hardness of < 180HB | Primary use | 59 ft/min | |
| P2.2 - Plain medium carbon steel containing < 0.55%C with a hardness of < 240HB | Primary use | 52 ft/min | |
| P2.3 - Plain high carbon steel containing > 0.55%C, with a hardness of < 300HB | Possible use | 46 ft/min |
| Suitability | vc | f | |
|---|---|---|---|
| P3.1 - Alloy steel with a hardness of < 180HB | Primary use | 43 ft/min | |
| P3.2 - Alloy steel with a hardness of 180 - 260HB | Possible use | 33 ft/min |
| Suitability | vc | f | |
|---|---|---|---|
| P4.1 - Tool steel with a hardness of < 26HRC | Possible use | 26 ft/min |
| Suitability | vc | f | |
|---|---|---|---|
| N1.1 - Pure aluminium and wrought aluminium alloys with a hardness of < 60HB | Primary use | 46 ft/min | |
| N1.2 - Wrought aluminium alloys with a hardness of 60 - 100HB | Primary use | 33 ft/min | |
| N1.3 - Wrought aluminium alloys with a hardness of 100 - 150HB | Primary use | 23 ft/min |
| Suitability | vc | f | |
|---|---|---|---|
| N2.1 - Cast aluminium alloys with a hardness of < 75HB | Primary use | 92 ft/min | |
| N2.2 - Cast aluminium alloys with a hardness of 75 - 90HB | Primary use | 82 ft/min | |
| N2.3 - Cast aluminium alloys with a hardness of 90 < 140HB | Primary use | 59 ft/min |
| Suitability | vc | f | |
|---|---|---|---|
| N3.1 - Free-cutting copper-alloys materials with excellent machining properties | Primary use | 144 ft/min | |
| N3.2 - Short-chip copper-alloys with good to moderate machining properties | Possible use | 89 ft/min | |
| N3.3 - Electrolytic copper and long-chip copper-alloys with moderate to poor machining properties | Possible use | 43 ft/min |
| Suitability | vc | f | |
|---|---|---|---|
| N4.1 - Thermoplastic polymers | Possible use | 72 ft/min |