Description
Sturdy blind-hole machine tap with 20° right-hand chip flutes.
Application
For UNC uniform coarse threads ASME B1.1.
Features
20° right-hand helix.
Advantages
Reliable chip evacuation.
Product Data
Product type: Blind-Hole Machine Tap UNC
Article family: 137860
Thread size: 5/16-18
Thread form: 20° right-hand helix
Tolerance: 2B
Tool material: HSS-E
Coating / surface: Uncoated
Dimensions
Overall length L: 90 mm
Shank diameter Ds: 8 mm
Square: 6.2 mm
Recommended tapping-hole diameter: 6.6 mm
Threads per inch: 18
Thread diameter: 7.94 mm
Cutting Data
Steel <500 N/mm²: 15 m/min
Steel <750 N/mm²: 12 m/min
Steel <900 N/mm²: 6 m/min
ISO Code
Aluminium and plastics: N
Aluminium: N
Aluminium cast >10% Si: N
Steel <500 N/mm²: P
Steel <750 N/mm²: P
Steel <900 N/mm²: P
Steel <1100 N/mm²: P
Steel <1400 N/mm²: P
Hardened steel: H
INOX: M
Titanium: S
Cast iron: K
Copper alloys: N
Graphite / GRP / CRP: N