Union Butterfield® 1010506 1578 Spiral Point STI Tap, Imperial, 1/4-20, 2 Flutes, 2B/3B/H2 Class of Fit, Plug Chamfer, Right Hand Cutting, UNC Thread

25821282 MFG #: 1010506
  • Brand: Union Butterfield®
  • Type: Spiral Point
  • Series: 1578
  • Measurement System: Imperial
  • Size: 1/4-20
  • Thread Standard: UNC
  • Thread Length: 1-1/8
  • Overall Length: 2-23/32
  • Number of Flutes: 2
  • Chamfer Type: Plug
  • Cutting Direction: Right Hand
  • Class of Fit: 2B/3B/H2
  • Shank Diameter: 0.318
  • Tap Drill Size: #7
  • Square Size: 0.23799999999999999
  • Material: HSS
  • Finish: Bright
Union Butterfield® STI Tap, Spiral Point, Series: 1578, Measurement System: Imperial, 1/4-20 Size, 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
  • Designed for use in
  • Designed for use in aluminum, magnesium, and other nonferrous materials where taps of this
  • Taps suitable for ot
  • Taps suitable for other materials can be furnished on request
  • STI taps are dimensi
  • STI taps are dimensionally oversize and utilize a larger tap drill size so that the thread
  • For a particular siz
  • For a particular size and pitch the lower H-Limit number is suggested for class 2B and 3B
  • Through hole
• Designed for use in aluminum, magnesium, and other nonferrous materials where taps of this type are most commonly used
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
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
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
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