NAAMS hexagon nuts come with fine or coarse threads. They are offered as a regular nut, with a washer face, as a jam nut, or a jam nut with a washer face. These nuts come in all sizes from an M5 x 0.8 to M36 x 4. Specifications are set to ANSI B18.2.4.2M for dimensions and ASTM A563M, class 12 steel.