RS PRO, Plain Nylon Hex Nut, M4

RS PRO Nylon 6.6 Hex Nuts - Metric Thread

RS PRO hex nuts are a six-sided nut that fastens screws and bolts efficiently and securely. They are the most common hexagonal fastener that has internal threads that screw on to the shank of a bolt or a hex cap screw. These metric hex nuts are available in a variety of sizes ranging from M2 to M12.
This range includes the following types of hexagonal nuts:
528-126 – M2
528-132 – M2.5
525-701 – M3
525-717 – M4
525-723 – M5
528-148 – M6
280-482 – M8
280-509 – M10
280-515 – M12