(0 items)
Union Butterfield UTD 1010506
Union Butterfield 6006891 1578 Spiral Point STI Tap, 1/4-20 Thread, 2 Flutes, 2B/3B/H2 Class of Fit, Plug Chamfer, Right Hand Cutting, UNC Thread
Factory Order
Union Butterfield STI Tap, Spiral Point, Series: 1578, Measurement System: Imperial, 1/4-20 Thread, UNC Thread Standard, 1-1/8 in Thread Length, 2-23/32 in Overall Length, 2 Flutes, Plug Chamfer, Right Hand Cutting Direction, Class of Fit: 2B/3B/H2, 0.318 in Shank Diameter, #7 Tap Drill, 0.238 in Square, HSS, Bright
Features
- Designed for use in aluminum, magnesium, and other nonferrous materials where taps of this type are most commonly used
- Taps suitable for other materials can be furnished on request
- STI taps are dimensionally oversize and utilize a larger tap drill size so that the thread they produce will accept a helical coil wire screw thread insert of the same nominal size and pitch
- For a particular size and pitch the lower H-Limit number is suggested for class 2B and 3B threads, while the higher H-Limit is suggested for class 2B
- Through hole
Specifications
ApplicationThrough Hole Applications
Chamfer TypePlug
Class of Fit2B/3B/H2
Cutting DirectionRight Hand
Finish/CoatingBright
MaterialHSS
Measurement SystemImperial
Number of Flutes2
Overall Length2-23/32 in
Series1578
Shank Diameter0.318 in
Square Size0.238 in
Tap Drill Size#7
Thread Length1-1/8 in
Thread Size1/4-20
Thread StandardUNC
TypeSpiral Point
Catalog
