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Newly Patented 
Slug Retention

    Available for License
            Are the progressive dies in your stamping operations plagued by any of the following  problems?

  • Die jams caused by loose slugs or pulled slugs?
  • Your current slug retention does not control loose slugs.
  • Broken die tooling  and crashed progressive dies?
  • Damaged parts reaching your customers?
  • High cost of replacing broken tooling and the labor to install the tooling?
  • Customer complaints  of damaged parts?
  • Orders that need rerun because of slug marks on the parts?
  • High cost of scrapped raw material  of orders needing rerun ?
  • High cost of labor to rerun orders?
  • Press hours lost to rerun orders?
  • Orders run late... because presses were tied up while trying to control loose slugs... causing time overruns?
  • Unsatisfied customers caused by receiving orders late?
  • High cost of your current slug retention method?
  • Loss of workforce skills to maintain your current  slug retention method?
  • Man hours lost rebuilding your damaged progressive dies caused by the issues listed above, when you need them to be working on other projects?

Client Participation
Effective slug retention that has the ability to control loose slugs is an important tool that is needed in all  designs of progressive dies.
Small Business
We love working with and helping small and large business owners.
Large Business
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There is a better solution to control loose slugs.

A few examples of our slug retention designs

Cross sections of rectangular trim inserts with slug retention added
Slug retention extending to taper relief.
Slug retention ending above  relief.
.0004"deep at cutting edge  and 0.0000" deep at taper relief.

Cross section of round profile insert with slug retention added


    Our retention involves adding a recess or groove into the sidewall of a trim profile.

   The depth of the recess into the cutting edge at the die line is about .0002" to .0005"
but may vary according to material type and thickness. The groove tapers to less depth as it extends down into the trim insert. The groove "tapers out"  to no depth, below punch travel, but can extend to, or below the insert relief.

   The groove causes the slug to have a protrusion on it, at the location of the groove.
    The area of the groove or recess  gets smaller towards the bottom of the recess. As the slug is pushed deeper into the trim insert,  the created protrusion,  is progressively squeezed  by this reducing area, continuously maintaining friction on the slug, holding the slug in the trim insert as the trim punch is withdrawn.

   The depth and length of the recess can be adjusted to match  the material being used, and your particular design.

                            Testimonial                                            I had a new progressive die to develop. I had set the die into the stamping press and started to load material into the die. I never got past the pierce station. Ninety percent of the pierce slugs that had been blanked were pulled up into the working area of the die. I tried every different slug retention that I knew about, but none of them would control the loose slugs in the insert.   I stumbled onto this new slug retention, and got permission to use it. The pierce insert was easily adapted with this new slug retention  by wire EDM. The die never pulled another loose pierce slug and I was able to continue with the die development.
THANK YOU for solving my problem.


Our slug retention design out performs

  • more efficient with a positive slug locking design
  • can be used in smaller profiles than current  slug retention methods
  • can be added to your existing tools
  • easily engineered into new tooling
  • exceptional in pierce and round  profiles
  • reduces maintenance costs
  • no need to precisely maintain punch length
  • keeps progressive dies running cleaner with less dirt and debris
  • quieter, cheaper and more effective than vacuums
  • no need to dull cutting edges
  • our slug retention is easier to manufacture
  • used in high speed  progressive dies
      Inquiries are Welcome
U.S. Patent  No. 9,789,529
U.S. Patent  No. 9,364,884


(717) 792-0433        Don  Cooper          

[email protected]


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