Union Butterfield® STI Tap, Straight Flute, Series: 1572, Measurement System: Imperial, 1/4-28 Thread, UNF Thread Standard, 1-1/8 in Thread Length, 2-23/32 in Overall Length, 3 Flutes, Plug Chamfer, Right Hand Cutting Direction, Class of Fit: 3B/H3, 0.318 in Shank Diameter, #3 Tap Drill, 0.238 in Square, HSS, Bright
| Finish/Coating |
: |
Bright |
| Material |
: |
HSS |
| Overall Length |
: |
2-23/32 in |
| Series |
: |
1572 |
| Shank Diameter |
: |
0.318 in |
| Square Size |
: |
0.238 in |
| Tap Drill Size |
: |
#3 |
| Thread Length |
: |
1-1/8 in |
| Type |
: |
Straight Flute |
| Measurement System |
: |
Imperial |
| Thread Size |
: |
1/4-28 |
| Number of Flutes |
: |
3 |
| Class of Fit |
: |
3B/H3 |
| Chamfer Type |
: |
Plug |
| Cutting Direction |
: |
Right Hand |
| Thread Standard |
: |
UNF |
- 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 or blind hole
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https://externalassets.unilogcorp.com/ASSETS/DOCUMENTS/ITEMS/EN/Union_Butterfield_1010443_Catalog.pdf
