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Circular threading die with central thread and side slit for adjusting cutting diameter.
UNF (Unified fine)

Round Die BS 1127; 1950 (o/d 1.1/2) HSS - UNF 1/2 x 20

Item no. 83042

€30.00

2 weeks delivery time
Application
VÖLKEL Round Die BS 1127; 1950 (o/d 1.1/2) HSS – UNF 1/2 x 20 | Precision External Thread Cutting Tool

VÖLKEL Round Die BS 1127; 1950 (o/d 1.1/2) HSS – UNF 1/2 x 20

The VÖLKEL Round Die UNF 1/2 x 20 made of high-speed steel (HSS) is engineered for precision external thread cutting in workshop and assembly operations. It offers a clean thread start, reliable chip formation and dimensional accuracy – ideal for maintenance, repair and small series production.

Application & Advantages
  • For general use
  • For machinable (non-abrasive) materials up to 800 N/mm²
  • Unalloyed and low-alloy steels

Advantages:

  • Precision UNF external threads according to ANSI B 1.1
  • HSS design for high tool life and reliable cutting
  • Optimised chip breaking via manual forward/back cut technique
  • Compatible with die holders of o/d 1.1/2
  • Technical Information (PDF)

Step-by-Step Instructions
  1. Preparation: Machine workpiece to core diameter, create a 30-45° chamfer and clamp securely.
  2. Alignment: Insert the die (o/d 1.1/2) flat and centred in the holder, cutting face forward.
  3. Cutting: Apply cutting oil; rotate approx. 1 turn forward, then ¼ turn back to break the chip; keep the die perpendicular.
  4. Finishing: Cut to the required thread length, reverse the die, remove chips.
  5. Check: Verify with a matching UNF nut or thread gauge; clean the thread surface.

Technical Data
  • Thread Type: Unified Fine Thread UNF (ANSI B 1.1)
  • Standard: BS 1127; 1950
  • Material: HSS
  • Nominal Size: UNF 1/2 x 20
  • Overall Length (L1): ½ die height
  • Outside Diameter: 1.1/2 o/d
  • EAN: 4022835830429
  • Article Number: 83042

Contents
  • 1× Round Die HSS – UNF 1/2 x 20 (o/d 1.1/2)

Frequently Asked Questions (FAQ)

Which materials can I use this die for?
Suitable for non-abrasive materials up to 800 N/mm² such as unalloyed and low-alloy steels.

What standards apply?
Thread according to ANSI B 1.1 (UNF); die according to BS 1127; 1950.

What holder do I need?
A die holder for outside diameter 1.1/2 (o/d).

Should I use cutting oil?
Yes – lubrication improves cutting performance, surface finish, and tool life.

Where can I find detailed technical data?
See the Technical Information PDF.

Questions about selection or use? Our team is happy to assist – use the contact form.

Additional information
Type of thread Unified Fine Thread
Standard BS 1127; 1950
Form splitted version (Form A)
Material HSS
Tolerance 2A
Size UNF 1/2 x 20
Overall length (L1) 1/2 Width
Outer diameter 1.1/2
EAN 4022835830429
Item number 83042
Thread standard ANSI B1.1
Rec. Bolt diameter 12.56 mm
VÖLKEL Round Die BS 1127; 1950 (o/d 1.1/2) HSS – UNF 1/2 x 20 | Precision External Thread Cutting Tool

VÖLKEL Round Die BS 1127; 1950 (o/d 1.1/2) HSS – UNF 1/2 x 20

The VÖLKEL Round Die UNF 1/2 x 20 made of high-speed steel (HSS) is engineered for precision external thread cutting in workshop and assembly operations. It offers a clean thread start, reliable chip formation and dimensional accuracy – ideal for maintenance, repair and small series production.

Application & Advantages
  • For general use
  • For machinable (non-abrasive) materials up to 800 N/mm²
  • Unalloyed and low-alloy steels

Advantages:

  • Precision UNF external threads according to ANSI B 1.1
  • HSS design for high tool life and reliable cutting
  • Optimised chip breaking via manual forward/back cut technique
  • Compatible with die holders of o/d 1.1/2
  • Technical Information (PDF)

Step-by-Step Instructions
  1. Preparation: Machine workpiece to core diameter, create a 30-45° chamfer and clamp securely.
  2. Alignment: Insert the die (o/d 1.1/2) flat and centred in the holder, cutting face forward.
  3. Cutting: Apply cutting oil; rotate approx. 1 turn forward, then ¼ turn back to break the chip; keep the die perpendicular.
  4. Finishing: Cut to the required thread length, reverse the die, remove chips.
  5. Check: Verify with a matching UNF nut or thread gauge; clean the thread surface.

Technical Data
  • Thread Type: Unified Fine Thread UNF (ANSI B 1.1)
  • Standard: BS 1127; 1950
  • Material: HSS
  • Nominal Size: UNF 1/2 x 20
  • Overall Length (L1): ½ die height
  • Outside Diameter: 1.1/2 o/d
  • EAN: 4022835830429
  • Article Number: 83042

Contents
  • 1× Round Die HSS – UNF 1/2 x 20 (o/d 1.1/2)

Frequently Asked Questions (FAQ)

Which materials can I use this die for?
Suitable for non-abrasive materials up to 800 N/mm² such as unalloyed and low-alloy steels.

What standards apply?
Thread according to ANSI B 1.1 (UNF); die according to BS 1127; 1950.

What holder do I need?
A die holder for outside diameter 1.1/2 (o/d).

Should I use cutting oil?
Yes – lubrication improves cutting performance, surface finish, and tool life.

Where can I find detailed technical data?
See the Technical Information PDF.

Questions about selection or use? Our team is happy to assist – use the contact form.

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