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
| Finish/Coating |
: |
Bright |
| Material |
: |
HSS |
| Overall Length |
: |
2-23/32 in |
| Series |
: |
1578 |
| Shank Diameter |
: |
0.318 in |
| Square Size |
: |
0.238 in |
| Tap Drill Size |
: |
#7 |
| Thread Length |
: |
1-1/8 in |
| Type |
: |
Spiral Point |
| Measurement System |
: |
Imperial |
| Thread Size |
: |
1/4-20 |
| Number of Flutes |
: |
2 |
| Class of Fit |
: |
2B/3B/H2 |
| Chamfer Type |
: |
Plug |
| Cutting Direction |
: |
Right Hand |
| Thread Standard |
: |
UNC |
- 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
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https://externalassets.unilogcorp.com/ASSETS/DOCUMENTS/ITEMS/EN/Union_Butterfield_1010300_Catalog.pdf
