Machine Nut Tap FZ HSS-G left hand thread - Tr 10 x 2 LH

• for general use
• non abrasive material up to 700 N/mm²
• unalloyed and low alloyed steel
• for thread depth up to 1 x D
• for through holes

1. Drill core hole: Drill the core hole with the correct diameter for the Tr 10 x 2 thread. The exact dimensions can be found in an appropriate thread table.
2. Prepare the tool: Securely and straightly clamp the tap into the holder of your tapping machine. Ensure the tool holder has the correct size to prevent slipping.
3. Lubrication: Ensure a sufficient supply of cutting oil or coolant to minimize friction and increase the tool's lifespan.
4. Cut the thread: Set the machine to the correct speed and feed rate. Start the cutting process in the left-hand thread direction (counter-clockwise).
5. Completion and cleaning: After cutting, thoroughly clean the spindle and the thread of chips and residues. Check the quality of the thread.

• Thread Type: metric ISO trapezoidal thread DIN 103
• Material: HSS-G
• Tolerance: 7H
• Nominal Size: Tr 10 x 2
• Overall Length (L1): 110 mm
• Thread Length (L2): 63 mm
• Shank Diameter (D2): 7 mm
• Drive Square: 5.5 mm
• Article Number: 79108-L

Q1: What is a machine nut tap?

A1: A machine nut tap is a special tap designed for cutting internal threads in nuts or other workpieces with through holes. It features a particularly long thread and a very short lead to cut the entire thread in a single pass and transport the chips forward out of the hole. Form FZ is a common design for this purpose.

Q2: What is a trapezoidal thread and what is it used for?

A2: A trapezoidal thread (Tr) is a thread with a trapezoidal profile. It is characterized by its high stability and load-bearing capacity and is primarily used for motion and feed drives, such as on lead screws in machine tools, vices, or lifting platforms.

Q3: What is a left-hand thread and what is it used for?

A3: A left-hand thread is tightened counter-clockwise and loosened clockwise. It is used in applications where a right-hand thread would unintentionally loosen due to rotation or vibrations. A well-known example is the left pedal on bicycles. For more information on left-hand threads, see this video: Left Hand Threads explained (German audio).

Q4: What does the 7H tolerance mean for a trapezoidal thread?

A4: The 7H tolerance is a standard tolerance for trapezoidal threads according to DIN 103. The number (7) indicates the thread fit, and the letter (H) indicates the tolerance position. 7H stands for a normal fit that allows for easy movement while minimizing play.

Q5: What is the difference between a single-pass tap and a machine nut tap?

A5: A single-pass tap is usually shorter and has a longer lead. A machine nut tap, on the other hand, is longer, has a full thread profile, and a shorter lead. It is specifically optimized for deep through holes in series production, as it cuts the entire thread in a single pass and carries the chips forward out of the hole.

Q6: How can I tell if a tap is a left-hand thread?

A6: A left-hand tap cuts in the counter-clockwise direction. Additionally, left-hand tools are often marked with an "LH" (Left Hand) or a corresponding symbol on the shank. If you were to tighten a screw with your left hand, you would turn it clockwise. With a left-hand thread, this would be loosening.