This robust hexagon die nut to DIN 382 is your go-to tool for quick, accurate external thread repair in the Unified National system. The designation UN 2-1/2 × 8 means a nominal outside diameter of 2.5 inches with 8 threads per inch (ANSI B1.1). Made from HSS-G, it delivers clean cutting performance and dependable accuracy—especially useful in awkward or hard-to-reach places where a ring or open-ended spanner is the most practical solution.
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.
| Thread system | Unified National (ANSI B1.1) |
| Standard | DIN 382 |
| Material | HSS-G (ground) |
| Nominal size | UN 2-1/2 × 8 (8 TPI) |
| Wrench size | 115 × 22 mm |
| EAN | 4022835241812 |
| Article No. | 24181 |
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.
Need help with UN thread sizes or choosing the right tool? Contact us via the contact form.
| Type of thread | UNx8 |
|---|---|
| Standard | DIN 382 |
| Material | HSS |
| Tolerance | 2A |
| Size | UNx8 2.1/2 x 8 |
| Width across flat | 115 mm |
| EAN | 4022835241812 |
| Item number | 24181 |
| Thread standard | ANSI B1.1 |
| Rec. Bolt diameter | 63.25 mm |
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