Quick view #4-40 Knurled Thumb Nuts with Shoulder, Solid Brass Knurls on the side of the head improves the grip.Brass: machinable, ductile, corrosion resistant, excellent electrical and thermal conductivity.Diameter (Nominal): #4Thread Pitch: 40Product Class: Internally Threaded FastenersOrder: Specialty... $49.12 Select Quantity Compare