Frequently Asked Questions about BOEHM JLB250PA 29-Piece Hollow Punch Set:

1. What is the BOEHM JLB250PA Hollow Punch Set?

The JLB250PA is a comprehensive, professional-grade hollow punch kit made in France. It’s designed to cut clean, precise holes and rings in soft to semi-rigid materials up to 50 mm in diameter. The set’s patented anti-vibration design and twinnable punches let you work faster, more comfortably, and with consistent results.

2. What exactly comes in the JLB250PA kit?

29 interchangeable, even-sized hollow punches (Ø 2 mm through Ø 50 mm)

1 hardened steel handle-chuck with reinforced impact head

1 chuck key (Allen wrench) for securing punches

1 retractable centering pin for accurate layout

User guide with operating instructions

3. Which punch sizes are included?

The 29 punches cover every even millimeter from 2 mm up to 50 mm:

2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 32, 34, 36, 38, 40, 42, 44, 46, 48, 50 mm

4. What materials can I punch with this set?

Ideal for cutting:

Rubber and gasket materials

Leather and fabrics

Cardboard, paperboard, and plastics

Felt, cork, and soft composites

Avoid extremely hard, brittle, or very thick materials that exceed the punch’s design limits.

5. How do I install and change punches?

Loosen the setscrew on the handle-chuck with the supplied Allen key.

Insert the punch shank fully into the chuck.

Tighten the setscrew securely so the punch can’t slip.

For ring cuts, mount two punches back-to-back (twinning) before tightening.

Retract the centering pin, align it on your mark, and apply firm, square blows to the impact head.

6. What is the patented anti-vibration system?

The handle’s reinforced impact head incorporates an internal damper that absorbs hammer shock. Benefits include:

Reduced user fatigue

Cleaner strikes and straighter cuts

Extended tool life

7. How does “twinning” punches work to cut rings?

“Twinning” means fitting two punches of different diameters into the chuck simultaneously. When struck, the outer punch cuts the outer circle and the inner punch cuts the core, creating a perfect ring in one motion.

8. Can I purchase replacement punches or parts separately?

Yes. Individual punches, handle-chucks, and centering pins are available from QTE Technologies (qtetech.com/en). Contact us with the exact diameter or part number needed.

9. How do I maintain and store my punch set?

After use, clean metal shavings from the punches with a brush.

Lightly oil punches and chuck if storing longer than a week.

Keep all components in the molded polypropylene case to protect against moisture and impact.

Store in a dry environment below 30 °C, away from direct sunlight.

10. What safety precautions should I follow?

Always wear eye protection to guard against flying chips.

Use sturdy, non-marring work surfaces (e.g., a hardened anvil or bench block).

Ensure the punch is perfectly perpendicular to the workpiece before striking.

Never exceed recommended material hardness - this prevents punch deformation or breakage.

11. Is the JLB250PA suitable for industrial or occasional use?

Its robust design, anti-vibration features, and full size range make JLB250PA equally at home in:

Production and maintenance workshops

Automotive gasket fabrication

Leatherworking and craft studios

Laboratory sample preparation

12. What warranty does BOEHM offer?

Please contact QTE Technologies (qtetech.com/en)

13. Where can I buy the JLB250PA set?

14. Troubleshooting Common Issues

Punch not cutting through: Check that material hardness is under the punch’s limit and that the punch is seated and tightened in the chuck.

Ragged or tapered hole: Ensure a flat striking surface and square blows; refresh punch cutting edge if dulled.

Punch jams in material: Clear waste debris from inside the punch barrel before continuing.