Hexagon Die Nut DIN 382 HSS - UNx8 2.1/2 x 8

• For cleaning and repairing damaged external threads in the UN system (ANSI B1.1)
• Ideal for awkward, tight, or obstructed locations—operates with ring/open-ended spanners
• HSS-G for sharp cutting action and dimensional stability
• Controlled, reliable rethreading without changing to a round die holder
• Fast maintenance and service operations

UNx8 explained: “× 8” specifies the pitch as 8 threads per inch (TPI). For UN 2-1/2 × 8, ensure matching components and gauges are also 8 TPI for correct engagement.

1. Prepare: Clean the thread area and lightly chamfer damaged starts. Secure the workpiece.
2. Lubricate: Apply a generous cutting oil. Reapply during the operation.
3. Align: Place the die nut squarely on the thread start and engage by hand.
4. Rethread: Turn steadily with a suitable spanner in the cutting direction. Avoid rocking; maintain lubrication.
5. Verify: Remove chips, then check with a mating nut or a thread gauge; repeat with a light finishing pass if required.

Does it fit UNC/UNF?
This model is for UN 2-1/2 × 8 (8 TPI). Always confirm thread series and pitch before use.

Which wrench should I use?
Use a ring or open-ended spanner that fits securely. Keep the tool square to the axis.

Which cutting fluid is recommended?
Use a high-performance cutting oil for steel to reduce friction and improve finish.

How can I avoid cross-threading?
Start by hand, ensure the first turns are square and smooth, and keep the tool lubricated throughout.

Machine use?
Primarily intended for hand operation. If machine-assisted, use very low speed and abundant lubrication.