Reviewing Lead Forming Before Inserting a Radial Capacitor

A radial capacitor that does not naturally fit the board holes needs a dimensional review before an operator pushes it into place. Lead preparation, insertion and clinching can each load the component differently. Establish the intended geometry before soldering fixes that geometry in the assembly.

Compare the actual part with the board

Check the complete supplier part number, lead form and packaging option against the footprint. Measure relevant lead spacing and finished-hole dimensions using the drawing tolerances. A capacitance and voltage match does not establish mechanical interchangeability.

Nichicon’s aluminum-capacitor guidance calls for forming mismatched lead spacing before soldering without excessive stress on the capacitor. It also identifies insertion and clinching as handling considerations. Obtain the current series-specific instructions before defining a production operation.

Define the forming operation explicitly

Show the required final lead geometry and how the operation supports the lead. The process owner should approve the tooling and method. Avoid an instruction that merely asks operators to bend the leads until the part fits.

For example, if a new supplier offers the required spacing as a factory-formed option, compare that complete part designation with a local forming route. The two routes may have different evidence and incoming inspection needs.

Inspect before and after insertion

Keep the seating requirement specific to the selected construction. A gap appropriate to one radial part should not be transferred to a snap-in or other mechanically different capacitor.

Separate incoming deformation from intentional lead preparation. If a reel or bag contains bent leads outside the supplied drawing, preserve examples and obtain a disposition. An approved forming instruction should not quietly become a repair method for an unexplained incoming condition.

Verify the finished assembly

1. Inspect the component body and lead exits.
2. Check solder-joint requirements.
3. Perform the required electrical examination.
4. Review later handling and support.
5. Release the part, tooling and operation together.

Do not straighten a soldered capacitor by using its body to bend the leads. If the position is unacceptable, use an approved rework procedure that addresses the soldered state and component requirements.

Retain before-and-after images during qualification, especially where local forming changes the supplied geometry. An end-of-line electrical pass alone may not show where the component experienced unintended mechanical load.

When changing board thickness or hole size, recheck insertion and clinching even if nominal lead spacing is unchanged. The solder material review covers the joining material, while capacitor cleaning scope addresses later exposure.