- 5318 Victory Drive
Indianapolis, IN 46203 - (800) 622-4824
- www.haggard-stocking.com
1/4-28 Tap, UNF STI thread, H3/H4, 3 flutes, HSS-E, TiN Coated, 40° Spiral Flute
- Item Code: 3989-6.35
- Brand: Guhring
- Unit Size: 1
Description
An STI tap thread tap is designed to create an oversized thread to accommodate the required Heli-Coil insert. Screw Thread Inserts (STI) are helically formed diamond shaped stainless steel or phosphorous bronze wire that screw into a threaded hole to form a mating internal thread. Screw thread inserts are a convenient way of repairing stripped out threads and are also used to provide stronger threads in softer materials than can be obtained by directly tapping the base metal.
Tech Specs
Back To Top| Reach (decimal) | 1.4570 |
|---|---|
| threadtype | UNF STI |
| Brand | Guhring |
| Shank Diameter (mm) | 8.0772 |
| Number of flutes | 3 |
| Overall Length (mm) | 69.1007 |
| Diameter | 1/4-28 |
| Overall Length (decimal) | 2.7205 |
| Diameter (mm) | 6.35 |
| Coating | TiN |
| H Limit | H3/H4 |
| Helix Angle | 40° |
| Material | HSS-E |
| Square Size (decimal) | 0.1909 |
| Coolant | without |
| Series | 3989 |