MISUMI / TECHNICAL BUYING GUIDE 1.1.0

Scrap retention: distinguish retention from hole quality

Check the punched-out item and the exact series before using retention features.

Why the distinction matters

MISUMI’s selection guide describes internal inclined grooves that form small projections on scrap; pushing the scrap onward compresses those projections to resist lifting. The same guide excludes precision-hole work and cases where the punched-out piece is the product.

The guide identifies limits involving hole size, tensile strength, thickness and clearance. Those limits are series-dependent selection evidence, not a blanket approval for your die.

Separate the installation options

The supplied SRS drawing distinguishes headed and straight configurations. Use the exact drawing and complete code; do not assume identical shank tolerances or installation details.

Bring the process evidence

  1. State whether the slug is scrap or product.
  2. Provide material certification and the full thickness range.
  3. Define whether a clearance value is per side or diametral.
  4. Record the observed scrap path, punch condition and lubrication.
  5. Agree a trial and inspection plan before production release.

Return to the piercing workflow

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