Close Space Punches - Metric CRN Coating

Q: How do I choose the correct shank diameter (D) for close-clearance punching in a progressive die?

Use the series shank diameter options of D = 02, 03, 04, 05, 06, 07 mm . Match the selected D to your punch guide or holder bore and to the standard die layout you are building the progressive set around. Correct shank sizing helps maintain alignment and stable punching forces in tight cavity conditions.

Q: What length range (L) should be selected to avoid under- or over-engagement in the die stack?

This series provides L = 40–100 mm . Choose a length that covers the entire die block stack-up and provides sufficient guidance engagement without contacting the end of the holder. Verify that your clamp height and any spacers keep the punch within safe working travel.

Q: What is the role of the CRN coating in reducing wear for production punching?

The punches are supplied with a CRN coating , intended to reduce wear mechanisms that occur during repetitive punching. In close-clearance conditions, maintaining edge condition is critical for consistent part dimensions. The coated surface helps improve tool life under production loads compared with uncoated tooling.

Q: How do I select the P dimension when designing for close clearance?

The series specifies P = 0.8–6.01 mm , which should be set to match the required close-clearance geometry and working profile in your tooling. P affects the punch’s functional relationship with the die clearance. Use your die design requirements to select the P value within the stated range.

Close Space Punches - Metric CRN Coating are designed for reliable punching in tight die cavities, where close clearance and repeatability matter most. The DAYTON tool steel construction with CRN coating supports consistent cycle performance.

Optimized for close-clearance punching applications in compact tooling
CRN coating helps reduce wear and improves tool life under production loads
Metric shank options support proper fit to standard die layouts
Suitable for progressive dies and precision forming operations requiring stable results

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Specifications

12 configurations available

D (Shank dia.) (mm)	L (Length) (mm)	P Dimension (mm)
02	40 ～ 100	0.8
02	40 ～ 100	0.81 ～ 2
03	40 ～ 100	1.1 ～ 2
03	40 ～ 100	2.01 ～ 3
04	40 ～ 100	1.3 ～ 3
04	40 ～ 100	3.01 ～ 4
05	40 ～ 100	1.3 ～ 4
05	40 ～ 100	4.01 ～ 5
06	40 ～ 100	1.3 ～ 5
06	40 ～ 100	5.01 ～ 6
07	40 ～ 100	1.3 ～ 6
07	40 ～ 100	6.01 ～ 7

Product Guide

🏭Application Scenarios+

Close clearance forming depends on punch geometry that stays stable under repeated impact, especially inside compact die cavities. These metric close space punches are commonly used in progressive dies for small automotive and appliance components, where the punch must maintain repeatable positioning while working with tight clearance between punch and die.

The CRN coating variant is suited for production runs that experience adhesive/abrasive wear, helping maintain consistent cutting edges through higher cycles. A second use case is precision metal stamping for connectors and thin sheet hardware, where close tolerances and stable force balance reduce dimensional drift across long batches.

They are also effective in precision forming operations that require predictable penetration with a defined shank size for compatibility with standard die layouts. Select the appropriate metric shank diameter (D: 2–7 mm) and a length within L (40–100 mm) to match the available die block stack-up and guide engagement.

🔧Material & Process Details+

These punches are manufactured from DAYTON tool steel and provided with a CRN (chromium nitride) coating to improve surface performance during punching. While the exact steel grade and heat-treatment state are not specified in the provided data, the intended metallurgy is for wear-resistant cutting service where impact loads and sliding contact occur.

CRN coating: increases surface hardness and reduces wear mechanisms such as adhesive transfer and abrasion, improving tool life.
Tool steel substrate: supports toughness needed for punching under production cycling; this provides a balance between edge strength and wear durability.

When comparing coated tooling options, a CRN-coated approach is typically chosen to extend life in high-cycle close-clearance operations where wear dominates over purely brute-force toughness.

📐Sizing & Selection Guide+

Select dimensions to ensure the punch fits the die set and provides the required working engagement in close-clearance tooling. This series uses a metric shank diameter D of 02, 03, 04, 05, 06, 07 mm, and a fixed length L in the range of 40 to 100 mm.

Match D to the guide/punch holder bore and the standard die layout you are using; using the correct shank diameter is essential for alignment in progressive and close-clearance dies.
Choose L to cover the full die stack-up and ensure sufficient guidance/engagement without bottoming in the holder.
Set the P dimension between 0.8 and 6.01 mm according to the required close-clearance geometry and punch working profile.

For best repeatability, confirm your press and die set tolerances for close-clearance operation; even small deviations in D and P can affect clearance consistency and part quality. D and L are the fixed series-controlled sizing elements, while P is variable within the stated range.

Frequently Asked Questions

How do I choose the correct shank diameter (D) for close-clearance punching in a progressive die?+

Use the series shank diameter options of D = 02, 03, 04, 05, 06, 07 mm. Match the selected D to your punch guide or holder bore and to the standard die layout you are building the progressive set around. Correct shank sizing helps maintain alignment and stable punching forces in tight cavity conditions.

What length range (L) should be selected to avoid under- or over-engagement in the die stack?+

This series provides L = 40–100 mm. Choose a length that covers the entire die block stack-up and provides sufficient guidance engagement without contacting the end of the holder. Verify that your clamp height and any spacers keep the punch within safe working travel.

What is the role of the CRN coating in reducing wear for production punching?+

The punches are supplied with a CRN coating, intended to reduce wear mechanisms that occur during repetitive punching. In close-clearance conditions, maintaining edge condition is critical for consistent part dimensions. The coated surface helps improve tool life under production loads compared with uncoated tooling.

How do I select the P dimension when designing for close clearance?+

The series specifies P = 0.8–6.01 mm, which should be set to match the required close-clearance geometry and working profile in your tooling. P affects the punch’s functional relationship with the die clearance. Use your die design requirements to select the P value within the stated range.

Is this punch configuration suitable for precision forming beyond progressive stamping?+

Yes. The provided tooling description indicates suitability for progressive dies and precision forming operations that require stable results. Ensure you select D within 2–7 mm, L within 40–100 mm, and P within 0.8–6.01 mm to match your forming cavity requirements.