Union Butterfield® 1010508 1578 Spiral Point STI Tap, Imperial, 1/4-28 Thread, 2 Flutes, 2B/3B/H2 Class of Fit, Plug Chamfer, Right Hand Cutting, UNF Thread

25821305 MFG #: 1010508
  • Brand: Union Butterfield®
  • Type: Spiral Point
  • Series: 1578
  • Measurement System: Imperial
  • Size: 1/4-28
  • Thread Standard: UNF
  • 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: #3
  • Square Size: 0.23799999999999999, 0.238
  • Material: HSS
  • Finish: Bright
  • Thread Size: 1/4-28
Union Butterfield® STI Tap, Spiral Point, Series: 1578, Measurement System: Imperial, 1/4-28 Thread, UNF 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, #3 Tap Drill, 0.238 in Square, HSS, Bright
  • Designed for use in aluminum, magnesium, and other nonferrous materials where taps of this
  • Designed for use in
  • Taps suitable for other materials can be furnished on request
  • Taps suitable for ot
  • STI taps are dimensionally oversize and utilize a larger tap drill size so that the thread
  • STI taps are dimensi
  • For a particular size and pitch the lower H-Limit number is suggested for class 2B and 3B
  • For a particular siz
  • 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