Stem bolts were a type of bolt used to fasten objects that was invented prior to 2153.
In 2153, a group of Osaarians in the Delphic Expanse had appropriated a large number of stem bolts, which they stored in a sphere. (ENT: "Anomaly")
In early 2375, Worf was annoyed that he and the USS Defiant had been on an extended convoy mission while the Dominion War was still raging. He preferred to be fighting, not wasting his time "protecting a shipment of stem bolts." (DS9: "Image in the Sand")