De nasjonale standert nûmer foar hexagon socket head screws is GB70-1985. D'r binne in protte spesifikaasjes en maten, ynklusyf 3 * 8, 3 * 10, 3 * 12, 3 * 16, 3 * 20, 3 * 25, 3 * 30, 3 * 45, 4 * 8, 4 * 10, 4 * 12, 4 * 16, 4 * 2, 4 * 2, 4 * 0, 4 * 2 35, 4 * 45, 5 * 10, 5 * 12, 5 * 16, 5 * 20, 5 * 25, 6 * 12, 6 * 14, 6 * 16, 6 * 25, 8 * 14, 8 * 16, 8 * 20, 8 * 3, 8 * 8, 8 * 8, 8 *40, ensafuorthinne.