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Application

VÖLKEL Hexagon Die Nut DIN 382 HSS-G – UN 2-1/2 × 8

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.

Application & Advantages

  • 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.

Quick Start Guide

  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.

Technical Specifications

Thread systemUnified National (ANSI B1.1)
StandardDIN 382
MaterialHSS-G (ground)
Nominal sizeUN 2-1/2 × 8 (8 TPI)
Wrench size115 × 22 mm
EAN4022835241812
Article No.24181

FAQ

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.

Additional information
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

VÖLKEL Hexagon Die Nut DIN 382 HSS-G – UN 2-1/2 × 8

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.

Application & Advantages

  • 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.

Quick Start Guide

  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.

Technical Specifications

Thread systemUnified National (ANSI B1.1)
StandardDIN 382
MaterialHSS-G (ground)
Nominal sizeUN 2-1/2 × 8 (8 TPI)
Wrench size115 × 22 mm
EAN4022835241812
Article No.24181

FAQ

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.

Die visible through a larger die.
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