- 5318 Victory Drive
Indianapolis, IN 46203 - (800) 622-4824
- www.haggard-stocking.com
1/4-28 Tap, Spiral Point Plug, UNC STI thread, H3/H4, 3 flutes, HSS-E, TiN Coated
- Item Code: 3991-6.350
- 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| threadtype | UNC STI |
|---|---|
| Material | HSS-E |
| Overall Length (decimal) | 2.7205 |
| Reach (decimal) | 1.4560 |
| Coating | TiN |
| Brand | Guhring |
| Diameter | 1/4-28 |
| Series | 3991 |
| chamfer (decimal) | Spiral Point Plug |
| Shank Diameter (mm) | 8.0772 |
| Diameter (mm) | 6.35 |
| Number of flutes | 3 |
| H Limit | H3/H4 |
| Overall Length (mm) | 69.1007 |
| Square Size (decimal) | 0.1909 |