BaerCoil HSSE Machine Tap UNC 1/4 x 20 STI (oversized for wire thread inserts) - PRO for through holes
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BaerCoil HSSE Machine Tap UNC 1/4 x 20 STI (oversized for wire thread inserts) - PRO for through holes
BaerCoil® machine taps are mainly used for thread repair or thread reinforcement in connection with wire thread inserts. This BaerCoil® screw tap can be used to cut a finished thread with oversize as a receiving thread for wire thread inserts of the dimension UNC 1/4 x 20 in one operation.
The receiving thread for UNC 1/4 x 20 thread inserts is also called STI thread (screw thread insert) or STI thread (in English Screw Thread Insert) and has an oversize so that the normal starting thread UNC 1/4 x 20 is restored after installation of the thread insert.
Our machine taps are powerful and reliable taps for efficient machining of threads in one operation on the machine. Machine taps are mainly used in industrial manufacturing. They are suitable for CNC machines, thread cutting machines, cordless drills and pneumatic thread cutting machines, among others. As they are characterised by high efficiency and low production costs, they are often used in series production. The thread is cut by machine in one operation.
This BaerCoil® tap can be used for through holes, as the long gate, the straight groove shape and the spiral point ensure that the chips are transported forward out of the hole
Dimensions
| Diameter |
1/4 |
|---|---|
| Nominal diameter in inches |
0,315 |
| Nominal diameter in mm |
8 |
| Pitch |
20 |
| Pitch in mm |
1,27 |
| Dimension |
UNC 1/4 x 20 EG/STI |
Characteristics
| Product group |
Screw taps Wire thread inserts - Taps |
|---|---|
| Product type |
BaerCoil screw taps |
| Thread standard |
UNC EG/STI: American Unified National Coarse thread for wire thread inserts according to ASME B1 |
| Tolerance |
2B mod. |
| Direction |
Right |
| Standard |
DIN 371 |
| Tensile strength at room temperature |
up to 900 N/mm² | 27.1 HRC |
| Material |
HSSE bright |
6.7 mm
Through hole up to 4 x D
Form B with spiral point
4-5 threads
Chips are removed downwards in the direction of cutting
External cooling and lubrication
HSSE bright
up to 900 N/mm² | 27.1 HRC
2B mod.
Applications
All normal uses for thread repair through-threads.
Technical drawing
| D1 |
8,0 mm |
|---|---|
| D2 |
8,0 mm |
| L1 |
90 mm |
| L2 |
20 mm |
| Diameter |
1/4 |
| Square |
6,2 mm |
Application – Sample materials for taps
| Unalloyed construction steels | Cutting speed vc in m/min | |
|---|---|---|
| 1.0037 | St 37-2 | 5 - 12 |
| 1.0044 | St 44-2 | 5 - 12 |
| 1.0039 | S 235JRG1+CR | 5 - 12 |
| 1.0060 | St 60-2 | 5 - 10 |
| Free-cutting steels | Cutting speed vc in m/min | |
|---|---|---|
| 1.0718 | 9 SMnPb 28 | 5 - 12 |
| 1.0721 | 10 S 20 | 5 - 12 |
| 1.0736 | 9 SMn 36 | 5 - 12 |
| 1.0726 | 35 S 20 | 5 - 10 |
| Cast steel | Cutting speed vc in m/min | |
|---|---|---|
| 1.0420 | GS-38 | 8 - 15 |
| 1.1120 | GS-20 Mn 5 | 5 - 15 |
| 1.5633 | GS-24 Ni 8 | 5 - 12 |
| 1.7379 | GS-18 CrMo 9 10 | 5 - 12 |
| Alloyed construction steels | Cutting speed vc in m/min | |
|---|---|---|
| 1.5415 | 15 Mo 3 | 5 - 12 |
| 1.5622 | 14 Ni 6 | 5 - 10 |
| 1.7335 | 13 CrMo 4 4 | 5 - 10 |
| 1.7715 | 14 MoV 6 3 | 5 - 10 |
Cutting speed vc [m/min] = (Outer diameter * π * speed) / 1000
Rotation speed n [1/min] = (Cutting speed in m/min * 1000) / (Outer diameter * π)
Feedrate programming [mm/min] = speed * pitch
Please note that the above cutting speeds are indicative and must be adjusted depending on lubrication and actuation.