<https://www.biotechfluidics.com/product/sealtight-flangeless-nut-delrinr-14-28-flat-bottom-for-116-od/>
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"SealTight Flangeless Nut Delrin(r) 1/4-28 Flat-Bottom, for 1/16\" OD - Biotech"
<https://www.biotechfluidics.com/product/sealtight-flangeless-nut-delrinr-14-28-flat-bottom-for-116-od/>