Union Butterfield UTD 1010509

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/H3, 0.318 in Shank Diameter, #3 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

Documents

• Catalog