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Spring Pin Insertion Force

Spring Pin Insertion Force

Spring Pin Insertion Force

I'm looking for a rule of thumb or other quick-n-dirty method of determining the approximate force required to insert a spring pin (roll pin, or whatever you call it).

Granted, there is going to be tolerancing of hole size, spring pin dia, out-of-round of the spring pin, and other factors in play.  But, for the sake of this conversation, let's use a perfectly round spring pin with the recommended hole size per Machinery's Handbook.

Is the rule of thumb for press fitting a dowel pin close enough?


RE: Spring Pin Insertion Force

Where I work, we use the same method of inserting roll/spring pins as we do dowel pins.  We have a press set to 125-150lbs for insertion.  We also use Machinery's Handbook for determining the interference.  So far (the 4 years I have been here) there hasn't been any problems.

"Happy the Hare at morning for she is ignorant to the Hunter's waking thoughts."

RE: Spring Pin Insertion Force

you didn't say if the pins were 1/16 dia or 1 inch dia. There will be a little variation in insert forces.  A spring pin should use approximately the same insertion pressure as a MEDIUM press fit dowel pin.  If you use the 125 to 150 lb figure for 1/4 spring pins, that same pressure will be insufficient for a 1/2 spring pin. Your best bet is to just try it and see what works.

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