STI HexTap V-COIL rapid machine tap Form D HSS-G - STI-UNC 1/4x20

• For STI inserts according to ISO 2 (6H)
• For free-cutting steels up to 900 N/mm²
• For unalloyed and low-alloy steels
• For cordless drivers or hand tools with 1/4'' drive
• Suitable for blind and through holes
• Compatible with all 1/4'' bit holders

• Precise production of STI internal threads
• Suitable for blind and through holes
• Optimised chip evacuation thanks to Form D
• Long tool life thanks to high-quality HSS-G grinding
• 1/4'' hex drive – no adapter required
• Perfect for workshops, service and repair

1. 1. Preparation: Drill the core hole, countersink and clean.
2. 2. Alignment: Align the tap perpendicular to the surface.
3. 3. Tapping: Cut with even pressure – manually or at low torque.
4. 4. Inspection: Check the thread and insert the STI insert.

• Form: D
• Material: HSS-G
• Tolerance: ISO 1 (4H)
• For inserts according to: ISO 2 (6H)
• Size: STI-UNC 1/4 × 20
• Overall length (L1): 42 mm
• Thread length (L2): 21 mm
• Diameter (B): 8 mm
• Drive: 1/4'' hex drive
• Article number: 03420

• 1 × STI HexTap V-COIL rapid machine tap STI-UNC 1/4 x 20 (Art. 03420)

Tip: Detailed information about difficult threads:
HexTap – The solution for difficult threads

What is an STI thread?
An STI thread is an oversized internal thread used for wire thread inserts – ideal for repairing or reinforcing threads.

What does Form D mean?
Form D offers optimised chip evacuation and is suitable for both blind and through holes.

How is the tap driven?
Via the 1/4'' hex drive – ideal for cordless drivers and hand tools.

Which materials is it suitable for?
For free-cutting steels up to 900 N/mm² as well as unalloyed and low-alloy steels.

Which tolerances apply?
The tap meets ISO 1 (4H); the finished STI thread with insert corresponds to ISO 2 (6H).