Round Die DIN 5158 (DIN EN 24231) HSS - G (BSP) 1.1/8 x 11 LH

G (BSP) – British Standard Pipe: This is a British standard for pipe threads (DIN ISO 228). Threads according to this standard are cylindrical, meaning they are not self-sealing and require a sealant (e.g., Teflon tape or hemp) for a tight seal. The nominal size 1.1/8 x 11 indicates the nominal diameter (1 1/8 inches) and the number of threads per inch (11).

DIN 5158 (DIN EN 24231): This standard specifies the dimensions and technical requirements for round dies. It ensures that the tool meets the highest standards and delivers reliable results.

Left-hand thread (LH): Unlike a standard right-hand thread, which is tightened by turning clockwise, a left-hand thread is tightened by turning counter-clockwise. Left-hand threads are used to prevent a connection from loosening under clockwise rotation or vibrations.

Follow these steps to use the die correctly:

1. Preparation: Cut the workpiece to the correct diameter. The cutting edge should be deburred and chamfered to make it easier to start the die.
2. Tool Clamping: Clamp the die into a die stock (tap wrench). Pay attention to a correct and firm positioning.
3. Starting the Die: Place the die straight and perpendicular to the workpiece. Start turning it slowly and evenly counter-clockwise to cut the left-hand thread.
4. Lubrication: Apply cutting oil or a suitable lubricant to the die and the workpiece. This reduces friction, extends the life of the tool, and improves thread quality.
5. Thread Cutting: Continue turning the die until the desired thread length is reached. Make sure the cut is consistently clean.
6. Cleaning and Inspection: Clean the finished thread of all chips and lubricant residues. Check the thread with a suitable thread gauge.

1. What is the difference between a die and a tap?

A die is used to cut external threads on bolts or pipes, while a tap is used to cut internal threads in holes.

2. What is a left-hand thread (LH) used for?

Left-hand threads are often used in applications where clockwise rotation or vibrations during operation could negatively affect the connection, for example, on fan blades, certain spindles, or bicycle pedals.

3. Can I use this die for stainless steels?

This die is made of HSS-G steel and is designed for easy-to-machine materials up to 800 N/mm² tensile strength. For high-alloy or stainless steels, dies made of HSSE or VHM (solid carbide) are more suitable.

4. What is the difference between a G thread and an R thread?

A G thread (BSP) is a cylindrical pipe thread that requires a sealant for sealing. An R thread (BSPT) is a tapered pipe thread that is self-sealing due to its taper.

5. How do I choose the right die stock?

Choose a die stock that matches the outer diameter of the die (in this case, 75 mm). Make sure the holder securely and centrally fixes the die to ensure a precise thread form.