Black steel and malleable iron plugs for closing threaded ports: 150 malleable square head plugs, countersunk hex socket and square socket plugs, and black steel hex head plugs. Square head plugs take a wrench from the outside; countersunk socket plugs sit flush where a projecting head would be in the way. Use thread sealant or tape suited to the service. Each listing groups the stocked part numbers for one style. Choose size and thread on the product page.
Black steel hex head plugs are stocked in 9 sizes.
